Crankshaft & Parts

Adapt Motorsport 127/133mm AC crankshaft pulley for Porsche 911 3.2 Carrera engines from 1984 onwards. CNC-machined from 7075 aluminium, it incorporates a 36-1 tooth trigger disc for crankshaft sensing in compatible EFI installations while retaining the air-conditioning drive.

Fits

• Porsche 911 3.2 Carrera engines from 1984 onwards
  Vehicles equipped with air conditioning

What This Product Does

This pulley replaces the factory steel crankshaft pulley and provides an integrated trigger pattern for a compatible crankshaft sensor. The 36-1 configuration supports the crank-position reference required when installing a suitable sequential electronic fuel-injection system.

Functions

• Provides 127 / 133mm pulley dimensions for the specified air-conditioning application
• Retains the air-conditioning drive on compatible 3.2-litre engines
• Supplies a 36-1 tooth trigger pattern for crankshaft sensing
• Supports compatible sequential EFI conversions
• Replaces the original steel pulley with a machined aluminium component

Technical Details

• Manufacturer: Adapt Motorsport
• Construction: precision CNC-machined 7075 aluminium
• Finish: black anodised for corrosion resistance and surface durability
• Pulley dimensions: 127/133mm
• Trigger pattern: 36-1 teeth
• Weight: 37% lighter than the factory pulley, according to the manufacturer

Why Replacement Matters

The pulley is intended for Porsche 911 3.2 Carrera EFI projects that require an accurate crankshaft trigger reference without removing the air-conditioning drive. Adapt Motorsport uses finite element analysis during the design process to balance component strength with reduced weight. Correct sensor positioning, pulley alignment and EFI calibration remain essential during installation.

FAQs

• Is this pulley intended for cars with air conditioning?
  Yes. It is specified for 3.2-litre engines from 1984 onwards that retain air conditioning.
• What trigger pattern does it use?
  The integrated trigger disc has a 36-1 tooth arrangement for use with a compatible crankshaft sensor.
• Can it be used for sequential EFI?
  It is designed to provide the crankshaft reference needed as part of a suitable sequential EFI conversion. The complete installation also requires compatible sensing, distributor-reference and engine-management components.
• Is it suitable for a car without air conditioning?
  This version is intended for air-conditioned applications. Adapt Motorsport offers alternative pulley arrangements for engines without air conditioning.

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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.


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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

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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

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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

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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

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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


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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.


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Fits:
For Cars with air conditioner (M599)
Porsche 911 3.2L 1984-89

Click 'Zoom in' for large parts diagram.
Diagram ref no 8.

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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. 

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Crankshaft Standard (STD)
This standard size crankshaft (STD) is a precision-engineered rotating assembly component used in several iconic Porsche air-cooled engines.

Fits:

• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1984 -1989 3.3L Turbo (930)
• Porsche 964 (911) TURBO 3.3L 1991-93       

Diagram ref no 1

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 high-value Porsche models like the 911 Carrera 3.2 and Turbo variants, a correct, high-quality STD crankshaft is one of the most critical investments in any rebuild.

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Fits:
Porsche 911 Carrera 3.2L 1984-89
Porsche 924S 1986-88
Porsche 944 1982-91
Porsche 968 1992-95
Porsche 964 1989-94
Porsche 993 1994-98
Porsche 996 Turbo / GT2 / GT3 1999-05
Porsche 997 Carrera 2009-12
Porsche 997 Turbo / GT2 2007-09
Porsche 997 Turbo / GT2 RS 2009-14
Porsche 997 GT3 2007-13
Porsche 981 Boxster 2013>>
Porsche 987 Boxster 2009-12
Porsche 981C Cayman 2014>>
Porsche 987C Cayman 2009-13
Porsche 991 Carrera / 991 Turbo / 991 GT3

Diagram ref no 1A

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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

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