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- 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 1975-1977 3.0L Turbo (930)
Standard Size Crankshaft (STD)
The standard size (STD) engine crankshaft is an
essential rotating component for the early air-cooled Porsche models.
Fits:
- Porsche 911 1972-1973 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1975-1977 3.0L Turbo (930)
Designed to maintain original journal dimensions and deliver long-lasting structural integrity, this crankshaft provides the precision, balance and strength demanded by classic flat-six engines.
Whether performing a true-to-original restoration or a full bottom-end rebuild, this crankshaft ensures proper bearing clearances, smooth rotation and the reliability required to support both naturally aspirated and early turbocharged Porsche engines.
What the Crankshaft Does
This crankshaft plays a central role in engine operation by:
- Transforming
piston movement into rotational torque to drive the transmission
- Maintaining
exact journal sizing for correct oil film and bearing support
- Ensuring
balanced rotation across the entire RPM range
- Supporting
reliable lubrication through precision oil galleries
- Handling
high load and thermal stress typical of air-cooled performance engines
- Providing dependable bottom-end stability for both normally aspirated and turbocharged setups
Without a properly sized and balanced crankshaft, the engine cannot run smoothly or reliably.
Why Crankshafts Can Fail
Although Porsche’s air-cooled crankshafts are renowned for
durability, age, performance use and lubrication issues can lead to failure.
Common causes include:
- Oil
starvation causing bearing damage and journal scoring
- Contamination
in the oil system leading to abrasive wear
- High-mileage
fatigue resulting in stress cracks or journal out-of-round conditions
- Overheating
reducing metallurgical strength
- Incorrect
machining or imbalance from past rebuilds
- Detonation
or pre-ignition placing excessive load on journals
- Corrosion from long storage or moisture intrusion
Symptoms can include low oil pressure, vibration, bearing noise, metal debris in the oil, or excessive crankshaft end-float.
Why You Should Replace a Worn or Damaged Crankshaft
Installing a new or precision-engineered standard size crankshaft—matched to original Porsche tolerances—provides the foundation for a reliable, long-lasting engine rebuild.
Benefits include:
- Restored bearing clearance and proper lubrication
- Smooth rotational balance and reduced engine vibration
- Improved reliability for both standard and turbocharged engines
- Protection against catastrophic bottom-end failures
- Extended lifespan for connecting rods, bearings and pistons
- Consistent performance in high-heat air-cooled environments
For valuable classics like the 1972–77 Porsche 911 and early 930 Turbo, a correct STD crankshaft is essential to preserving performance and longevity.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91610201600
The product you are viewing cross references to these numbers
- Porsche 356A 1955-59
- Porsche 356B 1959-63
The OE Match Main Crankshaft Bearing Set, Standard is a premium-quality replacement engine bearing kit designed to support the crankshaft and maintain precise rotational alignment in compatible Porsche engines. Manufactured to OE specifications for fit, material quality and durability, this standard-size main bearing set restores the correct bearing clearances between the crankshaft and engine block, ensuring optimum oil pressure, smooth crankshaft rotation and long-term engine reliability.
Fits:
- Porsche 356A 1955-59
- Porsche 356B 1959-63
Diagram Ref No 13
Manufactured from premium tri-metal bearing materials with a precision-machined bearing surface, each bearing shell is engineered to provide exceptional load-carrying capacity, low friction characteristics and excellent resistance to wear under demanding operating conditions. Designed for direct OE-style installation, this standard-size bearing set is ideal for engine rebuilds where the crankshaft journals remain within original factory specifications.
What This Product Does:
- Supports the crankshaft within the engine block.
- Maintains precise crankshaft bearing clearances.
- Allows smooth, low-friction crankshaft rotation.
- Maintains correct engine oil pressure.
- Reduces friction and wear between the crankshaft and engine block.
- Supports reliable engine lubrication.
- Restores factory engine operating tolerances.
- Forms an essential part of the engine bottom-end assembly.
Symptoms Of Wear Or Failure:
- Low engine oil pressure.
- Knocking or rumbling noises from the lower engine.
- Excessive crankshaft movement.
- Metal particles present in the engine oil or oil filter.
- Increased engine vibration.
- Accelerated wear of the crankshaft journals.
- Poor lubrication of internal engine components.
- Engine overheating due to increased friction.
- Loss of engine performance.
- Catastrophic engine failure in severe cases.
Why Replacement Matters:
- The main crankshaft bearings support the crankshaft while maintaining a thin film of pressurised engine oil between the bearing surface and the crankshaft journals. They are subjected to enormous combustion loads, constant rotational forces and continuous lubrication. Over time, normal wear, contamination or insufficient lubrication can damage the bearing surfaces, increasing bearing clearances and reducing oil pressure.
- Worn main bearings can lead to excessive crankshaft movement, reduced lubrication efficiency and accelerated wear of critical engine components. If left unresolved, bearing failure can result in severe crankshaft damage and complete engine failure.
- Replacing worn bearings with the OE Match Main Crankshaft Bearing Set restores the engine's bottom-end integrity, correct bearing clearances and stable oil pressure. Manufactured to OE standards using premium tri-metal bearing construction, this standard-size bearing set provides factory-style fitment, exceptional durability and dependable long-term performance, making it the ideal choice for Porsche engine rebuilds and professional restoration projects.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
54610190100
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
- Porsche 912E 4CYL 1976
Crankshaft Oil Seal
Protect your classic Porsche engine from oil leaks with this Crankshaft Oil Seal. This
high-quality oil seal is manufactured to OE specifications, providing a
reliable seal around the crankshaft where it exits the engine casing.
Constructed from durable, oil-resistant materials, it is designed to withstand
high temperatures, engine oil and constant crankshaft rotation while delivering
long-lasting performance.
Fits:
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
-
Porsche 912E 4CYL 1976
Diagram ref no 47
Whether you're rebuilding an engine, replacing a leaking seal or carrying out preventative maintenance, this OE Match crankshaft oil seal offers dependable sealing performance and factory-style fitment.
What Does the Crankshaft Oil Seal Do?
The crankshaft oil seal prevents engine oil from escaping where the crankshaft passes through the engine case while keeping dirt, dust and moisture away from internal engine components.
Its key functions include:
- Preventing engine oil leaks
- Maintaining correct engine oil pressure
- Protecting the crankshaft opening from contamination
- Supporting long-term engine reliability
A correctly functioning seal is essential for keeping the engine clean, lubricated and operating efficiently.
Why Do Crankshaft Oil Seals Fail?
Over time, the sealing lip is subjected to continual contact with the rotating crankshaft, as well as heat and exposure to engine oil.
Common causes of failure include:
- Age-related hardening of the seal
- Heat cycling
- Wear of the sealing lip
- Oil contamination
- Incorrect installation
- Crankshaft surface wear
As the seal deteriorates, engine oil can begin to seep or leak from the crankshaft opening.
When Should It Be Replaced?
Replacement is recommended if:
- Oil is visible around the crankshaft area
- The seal shows signs of hardening or cracking
- The engine is being rebuilt
- The flywheel or pulley has been removed
- Preventative maintenance is being carried out on an older engine
Replacing the seal during engine work is inexpensive preventative maintenance that can help avoid future oil leaks and unnecessary labour costs.
Porsche 356 & 912 Engine Seals
Engine oil seals play a vital role in maintaining the reliability of classic Porsche engines. As rubber seals age, they gradually lose their flexibility and sealing ability, allowing oil leaks to develop that can affect engine cleanliness and reliability.
Replacing crankshaft oil seals during routine servicing or engine rebuilds helps maintain correct lubrication, reduce oil loss and protect valuable engine components. OE Match seals are manufactured to provide factory-style fitment and dependable long-term performance, making them an ideal choice for restoration and maintenance projects.
Benefits of Replacing the Crankshaft Oil Seal
- Prevents engine oil leaks
- Maintains proper engine sealing
- Protects against dirt and moisture ingress
- Ideal during engine rebuilds
- Long-lasting, oil-resistant materials
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911301250
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Fastening Screw for Crankshaft Pulley
The OE
Match Crankshaft Pulley Fastening Screw is a replacement fixing designed to
secure the crankshaft pulley on classic Porsche 356 and 912 engines.
Fits:
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Diagram ref no 19
This essential fastening component helps maintain correct pulley positioning and reliable operation of the engine's belt-driven cooling fan and generator.
What Does It Do?
The fastening screw secures the crankshaft pulley to the crankshaft, allowing engine rotation to drive the generator and cooling fan through the drive belt.
Why Does It Fail?
Common
causes include:
- Damaged or stripped threads
- Corrosion and age-related deterioration
- Incorrect tightening during servicing
- Repeated removal and refitting
- Damage caused by unsuitable tools
When Should
It Be Replaced?
Replace if the screw has damaged threads, visible deformation, corrosion or signs of incorrect fastening.
Inspect the fixing whenever the crankshaft pulley is removed during engine servicing or restoration.
Checks & Installation
Inspect the crankshaft threads, pulley mounting surface and associated hardware before installation.
Follow the appropriate Porsche workshop instructions for correct tightening and pulley alignment. Do not reuse a fixing that cannot be secured correctly.
Key
Features
- OE Match replacement fastening screw
- Designed for crankshaft pulley assemblies
- Helps maintain secure pulley positioning
- Replaces damaged or missing original hardware
- Suitable for classic Porsche engine restoration
Porsche 356 & 912 Crankshaft Pulley Parts
The crankshaft pulley is an important part of the belt-driven generator and engine cooling system fitted to classic Porsche 356 and 912 models.
Correct fastening hardware helps maintain pulley alignment and reliable operation of the drive belt and associated components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
53902112
The product you are viewing cross references to these numbers
- Porsche 356A 1955-59
- Porsche 356B 1959-63
Fits:
Porsche 356A / 356B 1600 / S
Diagram Ref No 29
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
54610190185
The product you are viewing cross references to these numbers