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- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
A small sealing ring / pressure ring / rubber-grommet placed under valve-cover / rocker-cover bolts to seal the bolt hole and prevent oil from seeping past the fastener into the engine bay.
Sold each
Fits:
Porsche 944 S / 944 S2 1987 - 1991
Porsche 968 1992 - 1995
Porsche 928 S4 / 928 GT / 928 GTS 1987 - 1995
Diagram ref no 12.
This pressure ring creates a tight, oil-resistant seal around the valve-cover bolt holes, preventing leaks and keeping the cover seated properly. It maintains correct bolt clamping tension while protecting the aluminium cover from damage, and its heat-, oil- and vibration-resistant construction ensures long-term reliability under engine operating conditions. By replacing worn or hardened grommets, it restores proper sealing and supports clean, leak-free valve-cover installation during maintenance or gasket replacement.
Over time, pressure rings / bolt grommets degrade due to heat, oil exposure, and mechanical stress.
Worn seals can lead to:
• Oil seepage around valve-cover bolts
• Leaks dripping down into the engine bay or onto belts/harness
• Reduced engine bay cleanliness and potential fires in worst-case scenarios
• Difficulty obtaining proper clamping pressure when re-torquing the cover
Replacing the ring restores proper sealing, prevents future leaks, and ensures the valve cover remains securely mounted and sealed under all conditions.
When to replace - You should install new rings if:
• You are removing or replacing the valve cover or gasket
• Existing rings appear hardened, cracked, brittle, or deformed
• You notice oil leaking around valve-cover bolt heads
• You are performing engine maintenance or rebuilding the top end
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810411502
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
Fits:
Porsche 964 3.6 Turbo 08/1992-07/1994 (M65.40)
For Single-Belt Conversion, with Air Conditioning
Click 'Zoom in' for large parts diagram.
Diagram ref no 11.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96410215020
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
Pulley hub for 89-94 964 tapered snout crankshaft.
Machined from heat treated alloy steel and yellow zinc plated these are exact reproduction of OEM part.
For OEM replacement or use with 3609001402 single belt pulleys.
Fits:
Porsche 964 ('89-'94) Crankshaft Pulley Hub
for Tapered Snout Crankshaft
*Pulley in image is not included.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96410205001
The product you are viewing cross references to these numbers
- 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 3.6L 1991-93
Standard Size Crankshaft (STD)
The standard size crankshaft (STD) is a critical
rotating component used in Porsche 964 engines.
- 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 S 3.6L 1991-93
Precision machined to maintain original journal dimensions, this crankshaft ensures proper bearing clearance, smooth rotation and reliable power delivery. When rebuilding a high-performance flat-six engine, choosing the correct standard size crankshaft is essential to restoring the engine’s structural integrity and achieving long-term durability.
Engineered to meet the performance characteristics of the original design, this crankshaft is ideal for restorations, performance rebuilds and repairs requiring uncompromising accuracy and balance.
What the Engine Crankshaft Does
This crankshaft delivers several vital engine functions,
including:
- Converting piston motion into smooth rotational force
- Maintaining
precise journal dimensions for correct oil film and bearing clearance
- Balancing
the rotating assembly to minimise vibration and engine stress
- Supporting
consistent oil delivery through internal lubrication channels
- Ensuring smooth power transfer across all RPM ranges
- Forming the structural core of the bottom end assembly
A well-balanced standard-size crankshaft is essential for proper engine behaviour, especially in performance-prone flat-six units.
Why Crankshafts Commonly Fail
Despite being exceptionally robust, crankshafts can fail due
to age, wear or incorrect operating conditions. Common causes include:
- Oil
starvation leading to journal scoring or bearing failure
- Metal
fatigue after years of high-RPM use or detonation events
- Overheating
compromising the metallurgical integrity of the crankshaft
- Contamination
from debris causing gouging or premature wear
- Imbalance
or improper machining from previous engine work
- Severe
knock or misfires bending or twisting the crankshaft
- Prolonged high load driving accelerating fatigue in older engines
Symptoms typically include low oil pressure, knocking noises, excessive vibration, or visible scoring on journals during teardown.
Why You Should Replace a Worn or Damaged Crankshaft
Replacing a compromised crankshaft with a precision-built, standard size alternative engineered to match the original specifications ensures your Porsche 964 rebuild is stable, durable and capable of performing as intended.
Benefits include:
- Restored bearing clearance and oil pressure stability
- Reduced engine vibration and smoother power delivery
- Stronger resistance to high-RPM and high-load conditions
- Improved longevity of other bottom-end components
- Prevention of catastrophic engine damage or seizure
- More accurate balancing for performance and reliability
During an engine rebuild, the crankshaft is one of the most critical components to inspect and replace if any wear is detected.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96410202108
The product you are viewing cross references to these numbers