Crankcase Parts

Oil Pipe Tank to Engine. 2nd section.



Fits:
Porsche 911 1973-77

Click 'Zoom in' for large parts diagram.
Diagram Ref No 33.

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91110773911

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Oil pressure relief piston
This OE Match oil pressure relief piston is a replacement piston used in the engine crankcase oil pressure relief system. It is designed to match the original Porsche-style fitment and helps regulate oil pressure within the engine lubrication circuit.

Fits:
Porsche 911/930 1974 - 1989
Porsche 964 1989 - 1994
Porsche 993 1995 - 1998
Porsche 996 Turbo / GT2 2001 - 2005
Porsche 997 Turbo / GT2 2005 >>
Porsche 996 GT3 / 997 GT3

Diagram ref no 16

The oil pressure relief piston works with the relief spring and guide components inside the engine block/crankcase. Its job is to help control excess oil pressure by allowing oil to bypass when pressure reaches the required limit, protecting the lubrication system and helping maintain consistent oil flow to critical engine components.

Functions
•  Helps regulate engine oil pressure
•  Works with the oil pressure relief spring and guide sleeve
•  Helps protect the engine from excessive oil pressure

•  Supports correct oil flow through the lubrication system
•  Helps maintain reliable lubrication of bearings and internal engine parts
•  Provides an OE Match replacement for the original relief piston
•  Suitable for engine rebuilds, crankcase service, and oil pressure repairs

The oil pressure relief piston is exposed to constant oil flow, heat, pressure, and engine wear particles. Over time, the piston can become scored, worn, sticky, or damaged, which may affect oil pressure regulation. A worn or sticking piston can contribute to low, high, or unstable oil pressure, so replacement is recommended during engine overhaul or when oil pressure control issues are being investigated.

When to replace
•   Oil pressure is too high, too low, or unstable
•   The original piston is scored, worn, sticking, or damaged
•   The engine has suffered internal wear or contamination
•   The crankcase oil pressure relief system is being serviced
•   The oil pressure relief spring, guide sleeve, or plug is being replaced
•   The engine is being rebuilt or overhauled
•   There are concerns about correct lubrication system operation

Where it fits on the car
This piston fits inside the engine crankcase/oil pressure relief valve assembly. It sits in the crankcase and is used with the relief spring and guide sleeve to control oil pressure in the engine lubrication system.

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91110751200

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Oil Splash Valve. Sold as each.

Length: 21.5mm, Diameter: 6.2mm

Fits:
Porsche 911 SC - 1978 to 1983 (6 required)
Porsche 911 3.2 Carrera - 1984 to 1989 (6 required)
Porsche 928 S4 / 928 GT - 1987 to 1992 (8 required)

Diagram ref no 15

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91110101101

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Oil Splash Valve. Sold as each.

Length: 21.5mm, Diameter: 6.2mm

Fits:
Porsche 911 SC - 1978 to 1983 (6 required)
Porsche 911 3.2 Carrera - 1984 to 1989 (6 required)
Porsche 928 S4 / 928 GT - 1987 to 1992 (8 required)

Diagram ref no 15

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91110101101

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Oil Splash Valve. 6 per engine. Sold as each.



Fits:
Porsche 911 Turbo 930 - 1978 to 1989

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Diagram ref no 15

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93010101500

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Oil Splash Valve. 6 per engine. Sold as each.



Fits:
Porsche 911 Turbo 930 1978-89

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Diagram ref no 15

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93010101500

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Oil strainer. Porsche 911 1965-77 / 914-6
Old type design.

Fits:
Porsche 911 1965-83
Porsche 911 (930) Turbo 1975-77
Porsche 914-6 1970-76

Diagram ref no 38

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90110138002

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Oil strainer. Porsche 911 1965-83 / 914-6



Fits:
Porsche 911 1965-83
Porsche 911 (930) Turbo 1975-77
Porsche 914-6 1970-76

Click 'Zoom in' for large parts diagram.
Diagram ref no 38

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93010731400

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Oil thermostat on engine block.



Fits:
Porsche 911 1970-89
Porsche 911 (930) Turbo 1975-89
Porsche 914 1970-76

Click 'Zoom in' for large parts diagram.
Diagram ref no 37

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93010776500

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Oil thermostat on engine block.



Fits:
Porsche 911 1970-89
Porsche 911 (930) Turbo 1975-89
Porsche 914 1970-76

Click 'Zoom in' for large parts diagram.
Diagram ref no 37

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93010776500

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Oil thermostat.



Fits:
Porsche 911 1965-71

Click 'Zoom in' for large parts diagram.
Diagram ref no 57

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90110775100

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Oil tube seal for crankcase distribution oil pipes.
Sold each.



Fits:
Porsche 911 1970-89
Porsche 964 1989-94
Porsche 993 1994-98

Click 'Zoom in' for large parts diagram.
Diagram Ref No 14.

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9997071124A

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Oil tube seal for crankcase distribution oil pipes.
Round oil return tube O-ring used at the outer ends of the crankcase oil distribution / return tubes. Each tube uses two seals, and a complete engine typically requires multiple O-rings depending on tube type and configuration (often eight per engine on many 911/964/993 applications).
Sold each.

Fits:
Porsche 911 1970 - 1989
Porsche 964 1989 - 1994
Porsche 993 1994 - 1998

Diagram ref no 14.

This seal provides a leak-tight joint between the oil return tube and the crankcase or associated oil galleries. By sealing the tube ends, it:
• Prevents engine oil leaks at the tube junctions.
• Helps maintain correct oil circulation and system pressure.
• Keeps oil off the heat exchangers, exhaust and underside of the engine, reducing smells, smoke and contamination.

With age, heat and constant oil exposure, original O-rings can harden, flatten, crack or shrink. When they fail:
• Oil begins to weep or drip from the crankcase / tube junctions.
• The underside of the engine, heat exchangers and exhaust can become oil-soaked, causing burning smells and smoke.
• You may see oil spots under the car and gradual oil loss between services.

Replacing tired seals is a low-cost, high-impact fix that significantly reduces leaks and keeps the engine bay cleaner.

When to Replace
Consider replacing these oil tube seals if:
• You see oil leaks or dampness around the oil return tubes or crankcase unions.
• The engine is undergoing an oil return tube replacement (solid or collapsible).
• You’re performing an engine refresh, top-end rebuild, or major oil system service.
• The car shows persistent oil drips on the floor despite other seals being renewed.

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9997071124A

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Oil tube. (Non Collapsible)
The OE Match Oil Tube (Non-Collapsible) is a high-quality replacement engine lubrication component designed to transport engine oil between critical parts of the lubrication system. Manufactured to OE specifications for fit, durability and performance, this rigid oil tube ensures a reliable flow of oil throughout the engine, helping to maintain proper lubrication, cooling and oil pressure.  
Sold Each.
x4 Required Per Car.

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
• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) RS 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 993 (911) TURBO 1994-96
• Porsche 993 (911) GT2 1994-97
• Porsche 993 (911) TURBO S 1994-97  

Diagram Ref No 13

Constructed to replicate the original factory design, this non-collapsible oil tube provides a secure and dependable oil passage capable of withstanding the high temperatures, pressures and vibration associated with normal engine operation. It is an essential component for maintaining the health and longevity of the engine's lubrication system.  

What This Product Does:

• Transfers engine oil between lubrication system components.
• Maintains consistent oil flow and oil pressure.
• Supports lubrication of critical engine parts.
• Assists with engine cooling through oil circulation.
• Helps ensure efficient operation of the lubrication system.
• Provides a secure, leak-resistant oil passage.
• Supports long-term engine reliability and performance.

Symptoms Of Wear Or Failure:

• Visible engine oil leaks.
• Oil drips beneath the vehicle.
• Low engine oil level between services.
• Oil residue around oil line connections.
• Reduced engine oil pressure.
• Oil pressure warning light illumination.
• Burning oil smell from oil contacting hot engine components.
• Corrosion, cracking or physical damage to the oil tube.
• Signs of oil seepage at connection points.

Why Replacement Matters:

• Engine oil tubes operate in demanding conditions and are continually exposed to heat, pressure fluctuations, vibration and environmental contaminants. Over time, corrosion, fatigue, physical damage or deteriorated sealing surfaces can lead to leaks and reduced lubrication system efficiency.
• A damaged oil tube can result in oil loss, reduced oil pressure and insufficient lubrication of critical engine components. If left unresolved, oil leaks can contribute to accelerated engine wear, overheating and potentially severe engine damage. Even minor leaks can worsen over time and create reliability and maintenance concerns.
• Replacing a worn or damaged oil tube restores proper oil circulation and helps maintain the integrity of the engine lubrication system. An OE Match replacement provides factory-style fitment, dependable performance and long-term durability, ensuring reliable oil delivery and continued protection for your Porsche engine.

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90110735101

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Oil Tube (non Collapsible). Stainless steel.
O-rings required part number  9997071124A
Price is for 1 but there are 4 per engine.

Fits:
Porsche 911 2.0L 1965 - 1969
Porsche 911 1970 - 1989
Porsche 964 1989 - 1994
Porsche 993 1994 - 1998

Diagram Ref No 13.

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90110735101

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Oil Tube. (Non Collapsible)
Sold Each.
x4 Required Per Car.

Fits:
Porsche 911 911 2.0L 1965>>1969
Porsche 911 1970>>1989
Porsche 964 1989>>1994
Porsche 993 1994>>1998

Diagram Ref No 13

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