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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 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 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) TURBO 3.3L 1991-93
- Porsche 914 (1970-1976)
*** 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
- 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) TURBO 3.3L 1991-93
- Porsche 914 (1970-1976)
*** to be used for code no: 1
Fits:
Porsche 911 1965-89
Porsche 914-6 1970-76
Porsche 964 Turbo 3.3L 1991-92
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
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Fits:
Porsche 356 1300 / 1300 S / 1500 / 1500 S / 1600 / 1600 S 1950-59
Porsche 356 1600-SC 1960-65
Porsche 912 1965-69
Click 'Zoom in' for large parts diagram.
Diagram ref no 12
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PCG02105
The product you are viewing cross references to these numbers