OE Match

Fan Temperature Switch, 2 Pin.
The OE Match Fan Temperature Switch, 2 Pin is a high-quality replacement cooling system component designed to activate the radiator cooling fan when coolant temperatures reach a predetermined level. Mounted within the cooling system, this switch monitors coolant temperature and automatically signals the electric cooling fan to operate when additional cooling is required.

Fits:

• Porsche 924S 2.5L 1986-87
• Porsche 924S 2.5L 1988
• Porsche 944 2.5L 8V 1982-87
• Porsche 944 2.7L 8V 1988-89
• Porsche 944S 2.5L 16V 1987-88
• Porsche 944S2 3.0L 16V 1989-91
• Porsche 928 4.5L 1978-82
• Porsche 928S 4.7L 1981-83
• Porsche 928S2 4.7L 1984-86 

Diagram Ref No 5

Manufactured to OE specifications for fit, function and reliability, this 2-pin temperature switch helps maintain correct engine operating temperatures, protects against overheating and ensures efficient cooling system performance. It is an essential replacement item for maintaining the reliability of the vehicle's cooling system.

What This Product Does:

• Monitors coolant temperature within the cooling system.
• Activates the electric radiator cooling fan when required.
• Helps maintain optimum engine operating temperature.
• Prevents excessive heat build-up during low-speed driving or idling.
• Supports efficient cooling system operation.
• Protects the engine from overheating-related damage.

Symptoms Of Wear Or Failure:

• Cooling fan fails to operate when the engine reaches operating temperature.
• Engine temperature rises higher than normal.
• Engine overheating during traffic or idle conditions.
• Cooling fan runs continuously regardless of temperature.
• Inconsistent cooling fan operation.
• Temperature warning light activation.
• Reduced cooling system efficiency.
• Overheating during warm weather or heavy traffic conditions.

Why Replacement Matters:

• The fan temperature switch plays a critical role in controlling cooling fan operation and maintaining stable engine temperatures. Over time, repeated heat cycles, age and electrical wear can affect the switch's ability to accurately detect coolant temperature and activate the fan.
• A failed switch can prevent the cooling fan from operating when needed, significantly increasing the risk of overheating. Excessive engine temperatures can damage gaskets, seals, cooling system components and, in severe cases, major engine components.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

94460648100

The product you are viewing cross references to these numbers

Engine mount 
This is a hydro-elastic (fluid-filled) engine mount. It replaces earlier part numbers including 99337504905 and 99337504907, and is suitable for installation on either the left or right side.
Sold individually, two required per vehicle

Fits:
Porsche 993 (911) C2 1994 - 1997  (not Cabrio)
Porsche 993 (911) C4 1994 - 1997
Porsche 993 (911) C2S 1994 - 1997
Porsche 993 (911) C4S 1994 - 1997
Porsche 993 (911) TURBO 1994 - 1996

Porsche 996 TURBO 2000 - 2005
Porsche 996 GT2 2001 - 2005

Diagram Ref No 2.

Why Replace It, Engine mounts are crucial for:
•  Locating and supporting the engine
•   Absorbing vibration and engine torque under acceleration, braking, and cornering
•   When this mount deteriorates or fails, you can expect, Increased vibration transmitted to the cabin, steering, or pedals
•   Clunks, bangs, or loud noises during acceleration, deceleration, or gear changes from engine movement against the chassis
•   Visual signs such as leaking black fluid from the mount, sagging of tailpipes (due to dropped mounting), or visible damage to rubber or metal components 

Common Failure Causes:
•   Age-related rubber degradation: over time, rubber hardens, cracks or de-bonds, causing loss of damping and allowing engine movement
•   Fluid leakage (hydraulic version): loss of damping fluid due to seal failure accelerates failure
•   Fluid contamination: oil, coolant, or other contaminants degrade the rubber material
•   Vehicle abuse or stress: aggressive driving, hard launches, or previous accidents can warp or break mounts
•   Worn or cracked brackets: even if the rubber is intact, the aluminium bracket can be damaged or corroded, reducing effectiveness

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99337504909

The product you are viewing cross references to these numbers

Engine mount Part number 987.375.023.05 (often written 98737502305) is the centre engine mount / mount insulator used on mid-engine Porsche Boxster/Cayman models, commonly fitted to late 986 and 987 Boxster / early 987 Cayman applications. The item is offered both as the complete mount and bracket assembly and as a replacement bushing/insulator that must be pressed into the aluminium bracket.

Position: center engine mount (the central mount that locates the engine fore/aft and resists torque). 

Fits:

• Porsche Boxster 986 2.5L 1997-99
• Porsche Boxster 986 2.7L 1999-02
• Porsche Boxster S 986 3.2L 1999-02
• Porsche Boxster 986 2.7L 2003-04
• Porsche Boxster S 986 3.2L 2003-04
• Porsche Boxster 987 2.7L 2005 -08/08
• Porsche Boxster 987 S 3.2/3.4L 2005-08/08
• Porsche Cayman 2.7L 987C 2006-08
• Porsche Cayman S 3.4L 987C 2005-08  

Replace the part when it has lost its ability to control engine movement and damp vibration. Typical triggers to replace the centre mount include: 

• Hard clunk or bang on acceleration, deceleration or gear changes (engine shifting against chassis).
• Excessive vibration into the cabin, especially at idle or specific RPM bands.
• Visible damage — torn, separated rubber, oil-soaked or collapsed mount/bushing, or corrosion of mating faces. 

Common issues & failure causes

• Rubber deterioration: age, heat cycling and mechanical fatigue cause the rubber to harden, crack or de-bond from the metal, reducing isolation and allowing increased engine movement.
• Fluid contamination: oil or coolant leaks accelerate rubber breakdown (softening or swelling), commonly seen on older engines where leaks occur.
• Mechanical shock / abuse: repeated hard launches, aggressive shifting or collisions can cause sudden mount failure or promote early fatigue.
• Bracket wear / corrosion: the bushing may be fine, but the aluminium bracket can crack, corrode, or the bushing may need pressing into a worn bracket — which is why some techs prefer replacing the full assembly. 

This product supersedes Porsche's old part numbers:
- 98737502304
Click 'Zoom in' for large parts diagram.
Diagram Ref No 2.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

98737502305

The product you are viewing cross references to these numbers

Engine Mount.
The OE Match Engine Mount is a high-quality replacement mounting component designed to securely support the engine while isolating vibration and movement from the vehicle chassis. Engine mounts play a critical role in maintaining correct engine positioning, reducing noise and vibration, and ensuring smooth power delivery throughout the drivetrain.
Sold Each.
x2 Required Per Car.

Fits:

• Porsche 924S 2.5L 1986-87
• Porsche 924S 2.5L 1988
• Porsche 944 2.5L 8V 1982-87
• Porsche 944 2.7L 8V 1988-89
• Porsche 944S 2.5L 16V 1987-88
• Porsche 944S2 3.0L 16V 1989-91
• Porsche 944 Turbo 2.5L 8V 1985-88
• Porsche 944 Turbo 2.5L 8V 1989-91
• Porsche 944 Turbo S 2.5L 8V 1988
• Porsche 968 3.0L 1992-94
• Porsche 968 Sport 3.0L 1994-95
• Porsche 968 CS 3.0L 1993-95
• Porsche 968 Turbo S 3.0L 1993-94  

Diagram Ref No 1

Manufactured to OE specifications for fit, function and durability, this replacement engine mount combines robust metal construction with a resilient rubber damping element to provide the ideal balance of support and vibration isolation. It is an essential component for maintaining driving comfort, drivetrain alignment and overall vehicle reliability.  

What This Product Does:

• Supports and secures the engine within the chassis.
• Absorbs and dampens engine vibration.
• Reduces the transmission of noise into the passenger compartment.
• Maintains correct engine alignment and positioning.
• Controls engine movement during acceleration, braking and cornering.
• Helps protect drivetrain and exhaust components from excessive stress.

Symptoms Of Wear Or Failure:

• Increased engine vibration felt through the cabin.
• Clunking, knocking or thumping noises during acceleration or gear changes.
• Excessive engine movement when accelerating or decelerating.
• Harsh drivetrain engagement.
• Visible cracking, splitting or deterioration of the rubber mount.
• Sagging or misaligned engine position.
• Increased noise levels from the engine bay.
• Premature wear of adjacent drivetrain or exhaust components.

Why Replacement Matters:

• Engine mounts are subjected to continuous engine vibration, drivetrain torque, road shock, heat and environmental exposure. Over time, the rubber damping material can harden, crack, compress or separate from the mount housing, reducing its ability to properly support and isolate the engine.
• A failed engine mount can allow excessive engine movement, leading to increased vibration, poor driving refinement and additional strain on transmission mounts, exhaust systems, hoses and drivetrain components. If left unchecked, this can contribute to accelerated wear and costly repairs elsewhere in the vehicle.

Related reference numbers
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95137504204

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Engine / Gearbox Mounts - Sport Version Stiffer Than Standard.
The OE Match Engine / Gearbox Mounts – Sport Version are high-performance replacement mounts designed to provide increased drivetrain stability compared to standard factory mounts. Manufactured to OE specifications with a firmer rubber compound, these sport mounts offer enhanced control of engine and gearbox movement while maintaining excellent durability and fitment.
Sold Each. 
x2 Required Per Car.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 911 1978-1989 3.3L Turbo (930)  

Diagram Ref No 8

Designed for performance-focused road and track applications, these mounts help minimise drivetrain flex during acceleration, braking and cornering. The increased stiffness improves vehicle response, gear shift precision and overall driving feel while retaining the reliability expected from OE-style components.  

What This Product Does:

• Supports and secures the engine and gearbox assembly.
• Reduces excessive drivetrain movement under load.
• Provides greater drivetrain stability than standard mounts.
• Improves gear shift precision and drivetrain response.
• Helps maintain correct engine and transmission alignment.
• Reduces unwanted movement during acceleration, braking and cornering.
• Enhances vehicle handling characteristics and driver feedback.

Symptoms Of Wear Or Failure:

• Excessive engine or transmission movement.
• Clunking or knocking noises during gear changes.
• Increased drivetrain vibration.
• Harsh engagement when accelerating or decelerating.
• Misaligned or imprecise gear shifting.
• Sagging engine or gearbox position.
• Visible cracking, splitting or collapse of the rubber mount.
• Increased stress on exhaust, driveline and transmission components.

Why Replacement Matters:

• Engine and gearbox mounts are subjected to constant vibration, drivetrain torque, heat and road shock. Over time, the rubber can harden, crack, compress or separate from the mount structure, reducing its ability to support the drivetrain effectively.
• Worn mounts allow excessive engine and gearbox movement, which can negatively affect gear selection, handling characteristics and overall driving refinement. Excessive drivetrain movement may also place additional strain on exhaust systems, drive shafts, couplings and surrounding components.

Related reference numbers
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91137504306

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Gearbox Silencer Block.
The OE Match Gearbox Silencer Block is a high-quality replacement mounting component designed to isolate and dampen vibration and noise generated by the gearbox and drivetrain. Installed between the transmission assembly and vehicle mounting points, the silencer block helps absorb drivetrain movement and reduce the transmission of vibration into the chassis and passenger compartment.

Fits:

• Porsche 964 (911) C2 1989-93 MANUAL (Gearbox type G50.03 / G50.04 / G50.05)  TIPTRONIC (Gearbox type A50.02 / A50.03)
• Porsche 964 (911) TURBO 3.3L 1991-93 MANUAL (Gearbox type G50.52)
• Porsche 964 (911) TURBO 3.6L 1991-93 MANUAL (Gearbox type G50.52)
• Porsche 993 (911) C2 1994-97  MANUAL (Gearbox type G50.20 / G51.21)  IPTRONIC (Gearbox type A50.04 / A50.05)
• Porsche 993 (911) TURBO 1994-96 (Gearbox type G50.20 / G51.21)  IPTRONIC (Gearbox type A50.04 / A50.05)

Diagram Ref No 23

Manufactured to OE specifications using durable rubber and metal construction, this replacement silencer block restores the original levels of comfort, refinement and drivetrain support. It is an ideal replacement for worn, cracked or deteriorated original mounts commonly found on ageing Porsche vehicles.  

What This Product Does:

• Isolates gearbox and drivetrain vibrations from the chassis.
• Reduces transmission noise entering the passenger compartment.
• Supports the gearbox while allowing controlled movement.
• Helps maintain correct drivetrain alignment.
• Minimises shock loads during acceleration and gear changes.
• Improves driving comfort and refinement.

Symptoms Of Wear Or Failure:

• Increased vibration felt through the cabin.
• Excessive drivetrain movement during acceleration or deceleration.
• Clunking or knocking noises when changing gear.
• Harsh engagement during gear shifts.
• Visible cracking, splitting or deterioration of the rubber mount.
• Sagging or misalignment of the gearbox assembly.
• Increased transmission noise within the vehicle.
• Premature wear of surrounding drivetrain components.

Why Replacement Matters:

• The gearbox silencer block is continuously exposed to drivetrain torque, engine vibration, road shock, heat and age-related deterioration. Over time, the rubber element can harden, crack or separate from its metal mounting surfaces, reducing its ability to absorb vibration and support the transmission correctly.
• A failed silencer block can allow excessive gearbox movement, leading to increased vibration, drivetrain noise and additional stress on transmission mounts, couplings and related components. If left unresolved, excessive movement may contribute to accelerated wear throughout the drivetrain system.

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96437505581

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Camshaft Idler Roller.
The OE Match Camshaft Idler Roller  is a high-quality replacement timing belt guide roller designed to support and direct the camshaft timing belt within the engine timing system. As a critical component of the belt drive assembly, the idler roller helps maintain correct belt alignment, reduces vibration and ensures precise synchronisation between the crankshaft and camshaft.

Fits:

• Porsche 928S4 5.0L 1987-92
• Porsche 928GT 5.0L 1989-91
• Porsche 928GTS 5.4L 1992-95

  
Diagram Ref No 10

Manufactured to OE specifications for fit, performance and durability, this camshaft idler roller is engineered to withstand continuous operation, high rotational speeds and demanding engine conditions. It is an essential service item during timing belt replacement and preventative maintenance, helping to preserve the reliability and accuracy of the engine timing system.  

What This Product Does:

• Guides and supports the camshaft timing belt.
• Maintains correct timing belt alignment and routing.
• Helps reduce belt vibration and movement.
• Promotes even belt wear and consistent operation.
• Supports accurate synchronisation between crankshaft and camshaft.
• Contributes to reliable engine timing and performance.

Symptoms Of Wear Or Failure:

• Chirping, squealing or grinding noises from the timing belt area.
• Excessive timing belt vibration.
• Rough or noisy bearing operation.
• Visible wear or damage to the roller surface.
• Timing belt misalignment.
• Uneven or accelerated timing belt wear.
• Bearing looseness or excessive play.
• Increased risk of timing belt failure.

Why Replacement Matters:

• The camshaft idler roller operates continuously while the engine is running and is subjected to constant rotational forces, heat and bearing loads. Over time, bearing wear, loss of lubrication and material fatigue can reduce the roller's effectiveness and reliability.
• A failing idler roller can negatively affect timing belt tracking and alignment, causing premature belt wear and placing additional stress on surrounding timing components. In severe cases, bearing seizure or roller failure may result in timing belt damage or loss of engine timing, potentially leading to costly engine repairs.

Related reference numbers
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92810557104

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Cam Idler Roller.
The OE Match Cam Idler Roller is a high-quality replacement component designed to guide and support the engine's camshaft timing belt. As an integral part of the timing belt system, the idler roller helps maintain correct belt alignment and tension, ensuring precise synchronisation between the crankshaft and camshaft for optimal engine performance.

Fits:

• Porsche 944S 2.5L 16V 1987-88
• Porsche 968 3.0L 1992-94
• Porsche 968 Sport 3.0L 1994-95
• Porsche 968 CS 3.0L 1993-95
• Porsche 968 Turbo S 3.0L 1993-94  

Diagram Ref No 7

Manufactured to OE specifications for fit, function and durability, this cam idler roller is engineered to withstand high rotational speeds, engine heat and continuous operating loads. It is a recommended replacement during timing belt servicing, engine maintenance and timing system overhauls.  

What This Product Does:

• Guides and supports the timing belt during engine operation.
• Maintains correct belt alignment throughout the timing system.
• Helps reduce belt vibration and unwanted movement.
• Promotes even timing belt wear.
• Supports accurate camshaft and crankshaft synchronisation.
• Contributes to reliable engine timing and smooth performance.

Symptoms Of Wear Or Failure:

• Squealing, chirping or grinding noises from the timing belt area.
• Excessive timing belt vibration.
• Rough or noisy bearing operation.
• Timing belt misalignment.
• Uneven or accelerated timing belt wear.
• Visible wear or damage to the roller surface.
• Bearing play or looseness.
• Increased risk of timing belt failure.

Why Replacement Matters:

• The cam idler roller operates continuously whenever the engine is running and is subjected to constant rotational forces, temperature fluctuations and bearing loads. Over time, the internal bearing can wear, lubrication can degrade and the roller surface may become damaged.
• A failing idler roller can compromise timing belt alignment, leading to increased belt wear and unnecessary stress on the timing system. In severe cases, bearing seizure or roller failure may result in timing belt damage or loss of engine timing, potentially causing expensive engine repairs.

Related reference numbers
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94410524102

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Cam idler roller, 46mm diameter – 28mm wide.
This is a high-quality cam-/timing-belt idler/guide roller designed to replicates the original manufacturer specifications for diameter, width, bearing quality. Cam idler roller maintaining correct belt tension and alignment so that the camshafts, crankshaft (and in balance-shaft applications) remain perfectly synchronised. If the idler becomes worn or seizes, the belt can deviate, skip teeth or fail, potentially leading to catastrophic engine damage.

Fits:
Porsche 924S 1986 - 1988
Porsche 944 1983 - 1989*
Porsche 944 S, 944 S2, 944 Turbo
Porsche 968 1992 - 1995

* see Notes 2 & 3
Note 1: Also fits early 87 924S up to engine # 43H01919 (Manual Trans) & 43H60384 (Auto Trans)
Note 2: Also fits early 87 924S from engine # 43H01920 (Manual Trans) & 43H60385 (Auto Trans)
Note 3: Early cars (83-86) that have been updated to the later style water pump with belt guard rail will use this roller.

Diagram ref no 6

• Position on Vehicle: his part mounts in the timing belt drive system (camshaft-belt/guide roller area) on the front of the engine block, often adjacent to the belt guard/rail for the water pump/temporal belt path.

• Applications: Timing belt drive systems in the above-listed Porsche models (924S, 944, 968). Suitable replacement when restoring or maintaining correct cam/ crank timing and belt drive reliability.

The timing belt idler roller plays a crucial role in maintaining precise belt alignment and smooth engine operation. Over time, the bearing can wear out or seize, risking belt failure and serious engine damage. Replacing the roller during scheduled maintenance ensures long-term reliability, quiet operation, and protection of vital engine components.

When and why to replace:
• Signs of wear, noise, or rough bearing movement.
• During timing belt or water-pump service for easy access and complete system refresh.
• Preventative maintenance on high-mileage or older vehicles with original rollers.
• To prevent costly repairs caused by belt misalignment or breakage.
• To restore smooth, quiet belt operation and consistent timing performance.

Related reference numbers
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94410524104

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Cam Idler Roller,  Outer Diameter: 32 mm / Width: 21 mm.
The OE Match Cam Idler Roller is a high-quality replacement timing belt guide roller designed to support and guide the camshaft timing belt within the engine timing system. Featuring an outer diameter of 32mm and a width of 21mm, this precision-engineered idler roller helps maintain correct belt routing, alignment and stability throughout engine operation.

Fits: 

• Porsche 924S 2.5L 1986-87
• Porsche 944 2.5L 8V 1982-87
• Porsche 944 Turbo 2.5L 8V 1985-88  

Diagram Ref No 7

Manufactured to OE specifications for fit, function and durability, the roller is designed to withstand constant rotational loads, engine heat and high-speed operation. It is an essential service component during timing belt replacement and engine maintenance, helping to ensure reliable timing system performance and long-term engine protection.

What This Product Does:

• Guides and supports the camshaft timing belt.
• Maintains correct timing belt alignment and routing.
• Reduces belt vibration and unwanted movement.
• Promotes even belt wear across the timing system.
• Helps ensure accurate synchronisation between the crankshaft and camshaft.
• Supports smooth and reliable engine operation.

Symptoms Of Wear Or Failure:

• Squealing, chirping or grinding noises from the timing belt area.
• Excessive timing belt vibration.Rough or noisy bearing operation.
• Visible wear on the roller surface.Timing belt misalignment.
• Uneven or accelerated timing belt wear.
• Bearing play or looseness within the roller.
• Timing belt failure risk in severe cases.

Why Replacement Matters:

• The cam idler roller operates continuously whenever the engine is running and is subjected to constant rotational speeds, heat and bearing loads. Over time, the internal bearing can wear, lubrication can deteriorate and the roller surface may become damaged.
• A failing idler roller can cause timing belt misalignment, increased belt wear and excessive stress on other timing system components. In severe cases, bearing seizure or roller failure can lead to timing belt damage, potentially resulting in significant engine damage and expensive repairs.

Related reference numbers
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94410527302

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Cam Belt Tensioner.
The OE Match Cam Belt Tensioner is a high-quality replacement component designed to maintain the correct tension on the engine's camshaft timing belt. As a critical part of the timing system, the tensioner ensures the timing belt remains properly aligned and tensioned, allowing precise synchronisation between the crankshaft and camshaft.

Fits:

• Porsche 944S 2.5L 16V 1987-88
• Porsche 968 3.0L 1992-94
• Porsche 968 Sport 3.0L 1994-95
• Porsche 968 CS 3.0L 1993-95
• Porsche 968 Turbo S 3.0L 1993-94  

Diagram Ref No 9

Manufactured to OE specifications for fit, function and durability, this cam belt tensioner is engineered to withstand continuous operation, high engine speeds and demanding operating conditions. It is an essential replacement part during timing belt servicing, engine maintenance or timing system overhauls.

What This Product Does:

• Maintains correct tension on the camshaft timing belt.
• Prevents timing belt slack and misalignment.
• Ensures accurate synchronisation between the crankshaft and camshaft.
• Reduces vibration and movement within the timing belt system.
• Helps maintain precise valve timing and engine performance.
• Supports the longevity of the timing belt and related components.

Symptoms Of Wear Or Failure:

• Maintains correct tension on the camshaft timing belt.
• Prevents timing belt slack and misalignment.
• Ensures accurate synchronisation between the crankshaft and camshaft.
• Reduces vibration and movement within the timing belt system.
• Helps maintain precise valve timing and engine performance.
• Supports the longevity of the timing belt and related components.

Why Replacement Matters:

• The cam belt tensioner operates continuously whenever the engine is running and is subjected to constant load, heat and vibration. Over time, bearings, springs and pulley surfaces can wear, reducing the tensioner's ability to maintain proper belt tension.
• A failing tensioner can allow the timing belt to become loose, misaligned or prematurely worn. In severe cases, timing belt failure can occur, potentially causing significant engine damage and costly repairs. Because the timing system relies on precise belt tension to maintain accurate valve timing, replacing a worn tensioner is an important preventative maintenance measure.

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94410563110

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Piston Ring Set, ø93 mm, Ring 1,20 x 1,50 x 2,00 mm.
The OE Match Piston Ring Set is a high-quality replacement ring set designed for pistons with a 93mm bore diameter. Featuring ring dimensions of 1.20mm, 1.50mm and 2.00mm, this precision-engineered set is manufactured to OE specifications to ensure proper sealing between the piston and cylinder wall.
x6 Sets Required Per Car.

Fits:

• Porsche Boxster S 986 3.2L 1999-02
• Porsche Boxster S 986 3.2L 2003-04
• Porsche Boxster 987 S 3.2/3.4L 2005-08/08
• Porsche 955 Cayenne S 4.5L V8 2003-06
• Porsche 955 Cayenne Turbo 4.5L 2003-06  

Diagram Ref No 2

Piston rings are critical components within the engine, responsible for maintaining compression, controlling oil consumption and transferring heat from the piston to the cylinder wall. This OE Match ring set provides the correct fit, sealing performance and durability required for engine rebuilds, overhauls and performance restoration projects.

What This Product Does: 

• Creates a gas-tight seal between the piston and cylinder wall.
• Maintains engine compression for efficient combustion.
• Controls engine oil distribution on cylinder walls.
• Prevents excessive oil from entering the combustion chamber.
• Transfers heat from the piston to the cylinder bore.
• Helps optimise engine performance, efficiency and reliability.

Symptoms Of Wear Or Failure:

• Excessive engine oil consumption.
• Blue smoke from the exhaust system.
• Reduced engine compression.
• Loss of engine power and performance.
• Poor acceleration and throttle response.
• Increased crankcase pressure.
• Excessive engine blow-by.
• Fouled spark plugs caused by oil contamination.
• Difficult starting and reduced fuel efficiency.

Why Replacement Matters:

• Piston rings operate under extreme temperatures, pressures and friction throughout every engine cycle. Over time, normal wear can reduce their ability to seal the combustion chamber and control oil movement effectively. Excessive wear may result in compression loss, increased oil consumption and reduced engine performance.
• If worn piston rings are not replaced, combustion gases can escape past the piston, while engine oil can enter the combustion chamber, leading to increased emissions, carbon build-up and potential engine damage. During engine rebuilds or major repairs, replacing piston rings is essential for restoring proper compression, oil control and overall engine efficiency.

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99610303351

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Pop off air valve.

Fits:
Porsche 911 1973-89

Prevents costly airbox explosions, installed with the engine and air box in place. 911 engines since 1973 have had the bad habit of backfiring and blowing a hole an the air box. 911 POP VALVE is installed inside the air box and when a backfire occurs the valve will instantly open and release the backfire pressure. The POP VALVE then automatically closes and the angine continues to run. The POP VALVE has no effect on the performance or fuel mileage.

CIS Pop Off Valve Installation Click Here

For Fitting Instructions CLICK HERE

Please note the glue is not included with the air valve.

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911901522

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Valve guide standard. Inlet and exhaust. 12 required per engine (price is each)

This is the standard valve guide used in early air-cooled Porsche 911/930 cylinder heads. It’s a plain (non-hydraulic) guide that locates the valve stem in the head; when worn it causes oil burning, loss of compression and poor valve seating — so they’re commonly replaced whenever heads are rebuilt

• Fits:
• Porsche 911 1965-1968 2.0L / 912 SWB (F)
• Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 911 1978-1989 3.3L Turbo (930)

Diagram Ref No 2 and 2A.

What the part is (technical data / dimensions)

Application:
Porsche 911 / 930 from about 1965–1989 (varies slightly by model and year; early cars both intake & exhaust, later years sometimes exhaust only).
Standard size (typical OE): ID ≈ 9.00 mm, OD ≈ 13.06 mm, length ≈ 51.2 mm.        

Why these guides should be replaced

• Valve guides are a wearing item. Replace them when any of the following occur or when you rebuild the engine head.
• Excessive valve stem play — worn guide ID internal diameter lets the valve rock and misalign with the seat , poor sealing, reduced compression and power.
• Oil consumption / smoking — worn guides allow oil to wick down the stem into the combustion chamber, causing blue/grey smoke and fouled plugs.
• Hard starting, rough idle, misfire — poor sealing / valve timing irregularities from misaligned valves.
• Valve wobble that leads to premature valve stem wear or valve seat damage — once stems or seats are damaged you need deeper surgery.
• If a guide is cracked, broken, or has excessive ovality — must be replaced.
• Whenever you remove and refinish seats / replace springs / do a full head rebuild — replacing guides at that time is cheap insurance and ensures correct alignment. 

Inner diameter 9,00 mm
Outer diameter 13,06 mm
Total Length 51,20 mm

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93010432100

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Valve Spring
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The Porsche Valve Spring is a critical component of the valve train system fitted to numerous Porsche 911 and Porsche 964 models from 1965 to 1994. Designed to maintain precise valve operation throughout the engine's RPM range, the valve spring ensures that intake and exhaust valves close correctly after being opened by the camshaft.

Fits:

• Porsche 911 1965-1968 2.0L / 912 SWB (F)
• Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 911 1978-1989 3.3L Turbo (930)
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 964 (911) TURBO 3.3L 1991-93
• Porsche 964 (911) TURBO 3.6L 1991-93

Diagram Ref No 13

In Porsche's legendary air-cooled flat-six engines, accurate valve control is essential for maintaining combustion efficiency, engine performance, reliability, and long-term durability. The valve spring works continuously under extreme mechanical stress, cycling thousands of times per minute to keep the valve train operating correctly.

Whether you're rebuilding a classic Porsche engine, restoring a 911, or carrying out a cylinder head overhaul, replacing worn valve springs helps maintain factory performance and reduces the risk of costly engine damage.

What Does the Valve Spring Do?

The valve spring is responsible for returning the intake and exhaust valves to their closed position after each opening cycle generated by the camshaft.

Its key functions include:

• Maintaining correct valve timing operation
• Ensuring valves close fully and consistently
• Keeping the valve train under proper tension
• Preventing valve float at higher engine speeds
• Supporting engine compression and combustion efficiency
• Protecting the valve train from instability and excessive wear

Without adequate spring tension, valves may not close correctly, leading to poor performance and potential engine damage.

Why Does the Valve Spring Fail?

Valve springs are constantly subjected to compression, heat, vibration, and high engine speeds. Over time, these factors can lead to material fatigue and a gradual loss of spring tension.

Common causes of valve spring failure include:

• Metal fatigue from repeated cycling
• High mileage wear
• Prolonged exposure to engine heat
• Over-revving the engine
• Corrosion or contamination
• Performance modifications increasing valve train loads
• Age-related weakening of spring material
• Improper engine assembly or valve train geometry

As spring pressure decreases, valve control becomes less precise, particularly at higher RPM.

Common Symptoms of Worn Valve Springs

A weakened or damaged valve spring may cause:

• Loss of engine performance
• Valve float at higher RPM
• Rough idle
• Engine misfires
• Increased valve train noise
• Reduced power output Inconsistent compression readings
• Premature wear of valves, guides, and camshaft components

In severe cases, a broken valve spring can result in valve-to-piston contact and major engine damage.

When Should You Replace Valve Springs?

Valve springs should be inspected whenever the cylinder heads are removed and replaced if any signs of fatigue or wear are detected.

Replacement is strongly recommended:

• During complete engine rebuilds
• During cylinder head refurbishment
• On high-mileage engines
• When installing performance camshafts
• If valve float is present
• When spring tension falls below specification
• During preventative maintenance on restoration projects
• Whenever a spring shows signs of corrosion or damage

Many experienced Porsche engine builders replace all valve springs during rebuilds to ensure consistent valve train performance and long-term reliability.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90110590151

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Rocker Arm Adjustment Screw 
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The Porsche Rocker Arm Adjustment Screw is a vital valve train component used on Porsche 911 and Porsche 964 models from 1965 to 1994. This precision-engineered adjuster screw allows accurate setting of valve clearances, ensuring the correct relationship between the rocker arm and valve stem for smooth engine operation and optimal performance.

Fits:

• Porsche 911 1965-1968 2.0L / 912 SWB (F)
• Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 911 1978-1989 3.3L Turbo (930)
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 964 (911) TURBO 3.3L 1991-93
• Porsche 964 (911) TURBO 3.6L 1991-93

Diagram ref no 32

In Porsche's iconic air-cooled flat-six engines, valve clearance adjustment is a critical maintenance procedure. The rocker arm adjustment screw enables technicians to set valve lash precisely, helping maintain correct valve timing, efficient combustion, reduced valve train wear, and long-term engine reliability.

Whether you are carrying out a routine valve adjustment, rebuilding a cylinder head, or restoring a classic Porsche engine, replacing worn adjustment screws helps ensure accurate valve settings and dependable valve train operation.

What Does the Rocker Arm Adjustment Screw Do?

The rocker arm adjustment screw is used to establish and maintain the correct valve clearance between the rocker arm and the valve stem.

Its primary functions include:

• Allowing precise valve clearance adjustment
• Maintaining correct valve lash specifications
• Supporting accurate valve timing
• Reducing excessive valve train wear
• Ensuring smooth engine operation
• Helping maximise engine performance and efficiency

Correct valve clearance is essential on air-cooled Porsche engines, as thermal expansion during operation can significantly affect valve train geometry.

Why Does the Rocker Arm Adjustment Screw Fail?

Over time, the adjustment screw is subjected to constant mechanical loading, heat cycles, vibration, and repeated adjustment procedures.

Common causes of failure include:

• Wear on the adjustment tip
• Surface pitting or scoring
• Metal fatigue Excessive valve train loads
• Poor lubrication conditions
• Incorrect valve adjustment procedures
• Corrosion during long-term storage
• Damage caused during engine rebuilds or maintenance

As wear develops on the adjustment surface, maintaining accurate valve clearances becomes increasingly difficult.

Common Symptoms of a Worn Adjustment Screw

A worn or damaged rocker arm adjustment screw may cause:

• Excessive valve train noise
• Difficulty achieving correct valve clearance
• Frequent valve adjustment requirements
• Inconsistent valve lash measurements
• Reduced engine performance
• Increased wear on valve stems
• Rough running or poor idle quality
• Premature wear of related rocker arm components

In severe cases, excessive wear can affect valve timing accuracy and contribute to accelerated engine wear.

When Should You Replace It?

Replacement is recommended whenever wear is identified during inspection or engine servicing.

The adjustment screw should be replaced:

• During valve adjustment procedures if wear is found
• During cylinder head rebuilds
• During complete engine rebuilds
• When valve train components are being renewed
• If the adjustment tip is pitted or damaged
• When accurate valve clearance cannot be maintained
• During preventative restoration work
• On high-mileage engines showing valve train wear

Many Porsche engine specialists replace adjustment screws during major engine work to ensure consistent valve train geometry and long-term reliability

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90110537002

The product you are viewing cross references to these numbers