Crankshaft & Parts

Billet alloy crankshaft single belt pulley.
For cars without Air conditioning



Fits:
Porsche 911 1976-89

Diameter: 126mm

Replacement for following Porsche OE numbers 93010202801, 93010202809, 93010202804, 93010202808, 93010212602, 93010202301, 93010202303, 93010202305, 93010201704, 93010201707,

Billet Aluminum Crankshaft Pulley for Single Belt Conversion is a meticulously crafted and high-performance automotive component. Engineered from premium-quality aluminum billet, it offers superior strength and durability. This precision-designed pulley is specifically tailored for single belt conversions, providing seamless power transfer and optimal performance. Its lightweight construction ensures reduced rotational mass, resulting in improved engine responsiveness and enhanced overall driving experience. Upgrade your Porsche with this exceptional crankshaft pulley, and enjoy the perfect balance of style and functionality.


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Related, superseded, cross reference or alternative numbers for comparison.

3609001403

The product you are viewing cross references to these numbers

Crankshaft / V-Belt Pulley Hex Head Bolt. M12 x 1.5 x 22.



Fits:
Porsche 911 1965-89
Porsche 914 1970-76
Porsche 964 Turbo 3.3L 1991-92

Click 'Zoom in' for large parts diagram
Diagram ref no 15

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Related, superseded, cross reference or alternative numbers for comparison.

99909300502

The product you are viewing cross references to these numbers

Crankshaft circlip lock ring on the distributor drive gear. 



Fits:
Porsche 911 / 930 1978-89
Porsche 964 1989-94
Porsche 993 1995-98
Porsche 996 Turbo 2001-05
Porsche 996 GT3 3.6L 1999-05
Porsche 997.1 Turbo 3.6L 2007-09
Porsche 997.2 Turbo 3.6L 2010-13
Porsche 997 GT3 3.6L / 3.8L / 4.0L 2009-11

Click 'Zoom in' for large parts diagram.
Diagram ref no 11

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Related, superseded, cross reference or alternative numbers for comparison.

90110214801

The product you are viewing cross references to these numbers

Crankshaft circlip lock ring on the distributor drive gear. MARK 2.



Fits:
Porsche 911 / 930 1978-89
Porsche 964 1989-94
Porsche 993 1995-98
Porsche 996 Turbo 2001-05
Porsche 996 GT3 3.6L 1999-05
Porsche 997.1 Turbo 3.6L 2007-09
Porsche 997.2 Turbo 3.6L 2010-13
Porsche 997 GT3 3.6L / 3.8L / 4.0L 2009-11

Click 'Zoom in' for large parts diagram.
Diagram ref no 11

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Related, superseded, cross reference or alternative numbers for comparison.

90110214802

The product you are viewing cross references to these numbers

Crankshaft circlip lock ring on the distributor drive gear. MARK 3.



Fits:
Porsche 911 / 930 1978-89
Porsche 964 1989-94
Porsche 993 1995-98
Porsche 996 Turbo 2001-05
Porsche 996 GT3 3.6L 1999-05
Porsche 997.1 Turbo 3.6L 2007-09
Porsche 997.2 Turbo 3.6L 2010-13
Porsche 997 GT3 3.6L / 3.8L / 4.0L 2009-11

Click 'Zoom in' for large parts diagram.
Diagram ref no 11

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

90110214803

The product you are viewing cross references to these numbers

Crankshaft holder for Porsche 911



At last an elegant way to hold the 911 crankshaft for inspection, cleaning, disassembly, and rod bolt stretching. The crank rotates smoothly between centres to allow for complete access to all journals. Mounts vertically or horizontally in you bench mounted vice for optimal versatility.

Made from stainless steel and anodized aluminium.

Crankshaft Main Bearing O-Ring, 51x 4.5
The Genuine Porsche 99970728541 crankshaft main bearing O-ring is an OE 51 x 4.5 mm sealing ring for selected Porsche flat-six engine applications, including 911 1978–1989, 964, 993, 996 Turbo, 997 Turbo and GT3 models. It seals the crankshaft main / nose bearing area, helping prevent oil leaks and maintain proper engine sealing. Ideal for engine rebuilds, crankshaft service or replacing a hardened, flattened or leaking original O-ring.
Sold individually

Fits:
Porsche 911 1978 - 1989
Porsche 964 1989 - 1994
Porsche 993 1995 - 1998
Porsche 996 Turbo 3.6L 2001 - 2005
Porsche 996 GT3 3.6L 1999 - 2005
Porsche 997.1 Turbo 3.6L 2007 - 2009
Porsche 997.2 Turbo 3.6L 2010 - 2013
Porsche 997 GT3 3.6L / 3.8L / 4.0L 2007 - 2011

Diagram ref no 21

This O-ring is used in the crankshaft / main bearing sealing area on selected Porsche flat-six engines.

What This Part Does / Functions
•  Seals the crankshaft main / nose bearing area
•  Helps prevent engine oil leakage
•  Supports correct crankshaft bearing housing sealing
•  Helps maintain engine oil pressure and lubrication integrity
•  Provides correct OE Porsche size, material and fitment
•  Replaces a flattened, hardened, cut or leaking original O-ring
•  Supports correct reassembly during engine or crankshaft service
•  Helps maintain factory engine sealing performance.

Why Replace This Part?
Engine O-rings are exposed to oil, heat, pressure, age and compression. Over time, the rubber can harden, flatten, crack or lose elasticity. Once disturbed during engine disassembly, the O-ring should normally be replaced to ensure a reliable seal when reassembled. Replacing it with a Genuine Porsche OE crankshaft main bearing O-ring helps prevent oil leaks and ensures the engine is rebuilt with the correct factory sealing component.

Common Symptoms of a Failed O-Ring
•   Oil leakage from the crankshaft / main bearing area
•   Oil residue around the crankshaft housing
•   Persistent seepage after previous engine work
•   Hardened, flattened or cracked O-ring during inspection
•   Loss of sealing after engine disassembly
•   Oil leaks following crankshaft or bearing housing service.

When to Replace This Part
•   During engine rebuild or overhaul
•   When servicing the crankshaft main / nose bearing area
•   If the O-ring is hardened, flattened, split or damaged
•   If oil leakage is traced to the crankshaft bearing seal area
•   Whenever the relevant crankshaft bearing housing is removed
•   During gearbox-side or crankshaft sealing work where specified
•   When restoring the engine with correct Genuine Porsche sealing parts
•   Whenever Porsche workshop procedure recommends replacing the O-ring after removal.

Where It Fits on the Car
This O-ring fits in the engine crankshaft main / nose bearing sealing area. It forms part of the engine sealing arrangement around the crankshaft bearing housing and helps prevent oil from escaping through the joint. Correct installation is important. The sealing surfaces should be clean, and the O-ring should be installed without twisting, pinching or damage


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

99970728541

The product you are viewing cross references to these numbers

Crankshaft Main Bearing O-Ring, 51x 4.5
This OE Match crankshaft main bearing O-ring is a replacement sealing ring for Porsche 911 1978–1989, 964, 993, 996 Turbo, 997 Turbo, and GT3 models. Measuring 51 x 4.5, it is designed to match the original-style fitment and sealing function within the crankshaft / main bearing area.
Sold individually

Fits:
Porsche 911 1978 - 1989
Porsche 964 1989 - 1994
Porsche 993 1995 - 1998
Porsche 996 Turbo 3.6L 2001 - 2005
Porsche 996 GT3 3.6L 1999 - 2005
Porsche 997.1 Turbo 3.6L 2007 - 2009
Porsche 997.2 Turbo 3.6L 2010 - 2013
Porsche 997 GT3 3.6L / 3.8L / 4.0L 2007 - 2011

Diagram ref no 21

The crankshaft main bearing O-ring helps seal the relevant bearing or housing connection to prevent oil leakage and maintain correct engine oil sealing. A properly sealing O-ring is essential for protecting engine components and maintaining oil system integrity.

What This Part Does / Functions
•  Replaces the crankshaft main bearing
•  O-ring Helps seal the crankshaft / main bearing housing area
•  Supports correct engine oil sealing
•  Helps prevent oil leaks from aged or flattened seals
•  Suitable for engine rebuild, crankshaft, or bearing service
•  Replaces hardened, cracked, flattened, swollen, or damaged O-rings
•  OE Match replacement for Porsche engine sealing repair.

Why Replace This Part?
O-rings can harden, flatten, crack, swell, or lose sealing ability due to heat, age, oil exposure, pressure, and engine service work. A worn or damaged crankshaft main bearing O-ring may allow oil seepage or leakage, affecting engine cleanliness and oil system reliability. Replacement is recommended whenever the related engine components are removed or when oil leakage is present.

When to Replace This Part
•  Engine rebuild or major engine service is being carried out
•  Crankshaft or main bearing components are being serviced
•  Oil leakage is present around the related sealing area
•  The original O-ring is hardened, flattened, cracked, or damaged
•  Bearing housing or crankshaft sealing components have been removed
•  Preventative replacement is required during engine assembly
•  The vehicle is undergoing Porsche engine restoration

Where it fits on the car
This O-ring fits within the engine crankshaft / main bearing sealing area. Exact position can vary depending on engine type and model-specific crankcase layout.


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

99970728541

The product you are viewing cross references to these numbers

Crankshaft pulley titanium 134mm. 

Fits:
Porsche 911 / 911S / Carrera 3.0ltr - 1974 to 1977

Titanium is an Aerospace Material That Has the Highest Strength to Weight Ratio of any Structural Metal.
It has Been Used by Porsche Racing for Decades in Applications Where High Strength combined with the Lowest Weight is Required.
PMO Parts has Chosen to Produce a Limited Run of Motorsports Inspired Stock Configuration V-belt Crankshaft Pulleys for Your Engine Honoring This Rich Heritage.

Featuring:

• 3D Scanned & CAD Designed Using Genuine Sample Steel Parts
• CNC Machined in Aerospace Grade Titanium Ensuring High Strength and Precision
• Timing Marks @ Z1, 5⁰, 30⁰, 35⁰ BTDC

FE Marking is Suitable for MFI Pump Timing Applications, 120⁰ ( Z2 & Z3 ) Valve Timing Adjustment Marks also Included

• Porsche Motorsports Hole Pattern Mimics Original Racing Parts
• Reduces Rotating Mass and Engine Weight
• Includes Proprietary Titanium Mounting Bolt Featuring Thread Locking Compound
• Torque to 56 ft lbs (dry)

Diagram ref no 14

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

93010202808

The product you are viewing cross references to these numbers

Adapt Motorsport 127mm 36-1 Crank Pulley 

Upgrade the crankshaft pulley on a classic air-cooled Porsche 911 with this precision-machined Adapt Motorsport 127mm crank pulley, available in separate A/C and non-A/C configurations.

Fits:

• Porsche 911 / 911S 2.7Ltr - 1974 to 1978
• Porsche 911 Carrera 3.0Ltr - 1976 to 1977
• Porsche 911 SC - 1978 to 1983
• Porsche 911 3.2 - Carrara 1984 to 1989 (without Air Conditioning Version)

Both versions incorporate a 36-1 toothed crank trigger arrangement, providing the accurate crankshaft position reference required when converting an air-cooled Porsche engine to modern programmable electronic fuel injection. Adapt Motorsport designed the trigger pattern primarily for use with a suitable Hall-effect crankshaft sensor.

The non-A/C 127mm pulley is suitable for Porsche 911 2.7, 3.0 and 3.2 Carrera applications, while the A/C version incorporates an additional 90mm air-conditioning drive pulley.

Important: the A/C version is for early cars with the piston-style A/C compressor and is only suitable for cars up to 1983. It does not fit the 1984-onwards Porsche 911 Carrera 3.2 A/C system, which uses a larger-diameter A/C pulley. Adapt Motorsport specifically advises visually checking the pulley arrangement fitted to the engine before ordering. 

What Does the Crank Pulley Do?

The crankshaft pulley is driven directly by the engine crankshaft and provides the belt drive required for associated engine accessories.

On these classic Porsche applications, the main pulley also provides a convenient location for an accurate crankshaft position trigger when converting the engine to modern electronic management.

The A/C version adds the secondary belt groove required to drive the appropriate early air-conditioning compressor.

Integrated 36-1 Crank Trigger

Both pulley versions incorporate a 36-1 trigger pattern.

A 36-1 trigger has 36 possible tooth positions with one tooth deliberately omitted. As the crankshaft rotates, a suitable position sensor reads the passing teeth and identifies the missing-tooth reference.

This provides a compatible programmable ECU with an accurate indication of crankshaft position and engine speed.

The result is a much more suitable crankshaft reference for a modern EFI system than relying solely on the original distributor-based arrangement.

Designed for Hall-Effect Sensors

Adapt Motorsport states that the 36-1 trigger arrangement is best suited to Hall-effect sensors. 

A compatible crank sensor and correctly positioned sensor bracket are required to read the trigger wheel.

Adapt Motorsport offers a matching crank trigger sensor kit for this purpose.

Suitable for Sequential EFI Conversions

A crankshaft trigger provides the ECU with accurate crank position and engine-speed information, but fully sequential engine management also needs to establish which engine cycle each cylinder is on.

Adapt Motorsport therefore recommends combining the crank pulley with its matching distributor-drive reference and crank trigger sensor kit when building a sequential EFI system. 

With the appropriate ECU, sensors and calibration, this can provide the positional information required for modern sequential fuel injection and ignition strategies.

Precision-Machined 7075 Aluminium

The A/C pulley is precision machined from 7075 aluminium and finished in black anodising. 

7075 is a high-strength aluminium alloy commonly selected where a combination of strength and relatively low component weight is required.

Replacing an original steel pulley with a machined aluminium component can also reduce pulley mass, although the primary purpose of these Adapt Motorsport pulleys is to provide a replacement pulley with an integrated 36-1 EFI trigger system.

Campagnolo-Inspired Design

The non-A/C version has been styled after the distinctive appearance of the famous Campagnolo rally wheel. 

This gives the pulley a period motorsport-inspired appearance that complements classic 911 restomod, rally-inspired and competition engine builds while incorporating the modern 36-1 crank trigger.

Why Upgrade to a Trigger Pulley?

A crank trigger pulley becomes particularly useful when the engine is being converted from its original management system to a modern programmable ECU.

Typical reasons for installing one include:

• Programmable EFI conversion
• Sequential fuel injection
• Modern programmable ignition
• Distributor-delete conversion
• Coil-on-plug conversion
• Engine rebuild with modern management
• Restomod engine build
• Motorsport engine preparation
• More accurate crankshaft position sensing
• Replacement of the original steel crank pulley

The pulley itself does not increase engine power. Its main advantage is providing the mechanical drive function together with a precise crankshaft reference for compatible electronic engine management.

Porsche Carrera 3.2 Applications

For a Porsche 911 Carrera 3.2, the distinction is straightforward.

If the engine does not require an A/C pulley, the 127mm non-A/C version is the appropriate version covered by this listing. Adapt Motorsport lists its non-A/C pulley for 2.7, 3.0 and 3.2 engines. 

If the Carrera 3.2 retains its original-style air-conditioning system, do not use the 127/90mm early A/C version. The 1984-onwards 3.2 Carrera requires the later larger-diameter A/C pulley arrangement. 

Checks Before Ordering

Classic Porsche 911 engines frequently undergo modifications, engine swaps and air-conditioning upgrades, so model year alone should not be the only check.

Before ordering, confirm:

• Engine type
• Existing crank pulley diameter
• Whether air conditioning is fitted
• A/C compressor type
• Existing A/C pulley diameter
• Belt arrangement
• Crank sensor configuration
• ECU compatibility with a 36-1 trigger
• Sensor mounting arrangement

For an A/C-equipped car, visually checking the existing pulley and compressor arrangement is particularly important, as recommended by Adapt Motorsport. 

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

93010202809

The product you are viewing cross references to these numbers

Crankshaft Standard (STD)
The standard size (STD) crankshaft is a key rotating component for the classic Porsche 911 SC (3.0ltr). 

Fits:

• Porsche 911 1978-1983 3.0L / SC         

Diagram ref no 1

Engineered to match original build specifications, this crankshaft ensures proper journal dimensions, smooth rotation and long-term durability within the renowned air-cooled flat-six engine. Whether restoring a classic 911 SC or rebuilding a high-mileage bottom end, this precision-machined crankshaft plays a vital role in maintaining authentic Porsche performance.

Designed to maintain original journal dimensions and deliver exceptional strength, this crankshaft plays a crucial role in preserving the smoothness, reliability and performance expected from these high-value flat-six engines.

Whether performing a classic restoration, a bottom-end refresh or a full performance rebuild, this crankshaft is essential for ensuring correct bearing clearances, optimal lubrication and long-term engine integrity.

What the Engine Crankshaft Does

This crankshaft is responsible for key engine functions, including:

• Converting piston motion into rotational torque that drives the transmission
  
• Maintaining accurate journal diameters to support proper bearing lubrication
  
• Providing smooth, balanced rotation across the engine’s entire RPM range
  
• Distributing oil internally through precision-machined lubrication galleries
  
• Supporting turbocharged loads with a strong, durable crank web and journal design
  
• Forming the foundation of the bottom-end rotating assembly

A correct standard-size crankshaft is vital to the long-term reliability and performance of any air-cooled Porsche flat-six.

Why Crankshafts Can Fail

Even though Porsche engineered these crankshafts for durability, decades of use and performance driving can lead to wear or damage. Common causes of failure include:

• Oil starvation resulting in journal scoring or bearing failure
  
• Metal fatigue from high RPM use, boost pressure or detonation
  
• Contamination in the oil supply causing abrasive wear
  
• Overheating weakening the crankshaft’s molecular structure
  
• Incorrect machining from past rebuilds creating imbalance or mismatched tolerances
  
• Severe knock events bending or cracking the crankshaft
  
• High-mileage wear reducing journal roundness and bearing clearances

Symptoms of crankshaft-related failure include low oil pressure, metallic knocking, vibration, bearing debris in oil, and uneven rotation during teardown.

Why You Should Replace a Damaged or Worn Crankshaft

Installing a new or precision-built standard size crankshaft—designed to match original Porsche performance tolerances—ensures a strong, balanced and reliable engine rebuild.

Key benefits include:

• Restored bearing clearances and stable oil pressure
• Smooth, balanced engine rotation at all RPM ranges
• Reduced vibration and improved power delivery
• Enhanced reliability under turbocharged loads
• Prevention of severe bottom-end failures
• Increased lifespan of pistons, rods and bearings
• Assurance of correct geometry for high-performance use

For a Porsche 911 SC rebuild, choosing the correct STD crankshaft is one of the most important steps in achieving a long-lasting, dependable engine.

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

93010201508

The product you are viewing cross references to these numbers

Crankshaft timing gear.
*** to be used for code no: 0



Fits:
Porsche 911 1965-89
Porsche 914-6 1970-76
Porsche 964 Turbo 3.3L 1991-92

Click 'Zoom in' for large parts diagram.
Diagram ref no 11

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

90110211102

The product you are viewing cross references to these numbers

Crankshaft timing gear.
*** to be used for code no: 0



Fits:
Porsche 911 1965-89
Porsche 914-6 1970-76
Porsche 964 Turbo 3.3L 1991-92

Click 'Zoom in' for large parts diagram.
Diagram ref no 11

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

90110211102

The product you are viewing cross references to these numbers

Crankshaft timing gear.
*** to be used for code no: 1



Fits:
Porsche 911 1965-89
Porsche 914-6 1970-76
Porsche 964 Turbo 3.3L 1991-92

Click 'Zoom in' for large parts diagram.
Diagram ref no 11

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

90110211120

The product you are viewing cross references to these numbers