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- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
The standard size (STD) engine crankshaft is a critical rotating component for Porsche 996 Carrera and 997.1 Carrera / Carrera S models equipped with the M96/M97 engines
Fits:
- Porsche 996 C2 3.6L 09/01-2005 (engine code M9603)
- Porsche 996 C4 3.6L 09/01-2005 (engine code M9603)
- Porsche 996 C4S 3.6L 09/01-2005 (engine code M9603)
- Porsche 997 MK1 Carrera 2 3.6L 2005-08 (engine code M9605)
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08 (engine code M9701)
- Porsche 997 MK1 Carrera 4 3.6L 2005-08 (engine code M9605)
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08 (engine code M9701)
Designed to maintain original journal dimensions and deliver balanced, dependable rotation, this crankshaft ensures proper bearing clearances, stable lubrication and smooth power delivery—essential for both everyday driving and spirited performance use.
Whether restoring a high-mileage engine, repairing bottom-end damage or conducting a complete power unit rebuild, this precision crankshaft is fundamental to achieving long-term reliability and authentic Porsche performance.
What the Crankshaft Does
This crankshaft performs multiple key functions at the heart
of the Porsche flat-six engine:
- Transforms piston motion into smooth, controlled rotational torque
- Maintains
exact journal sizing for correct oil clearance and bearing support
- Provides
balanced rotation across the engine’s full RPM range
- Supports
consistent lubrication through precision oil galleries
- Ensures
durable, stable bottom-end operation under high loads
- Forms the structural core of the M96/M97 rotating assembly
A correctly sized, properly balanced crankshaft is essential for engine health, power consistency and long-term performance.
Why Porsche Crankshafts Can Fail
While Porsche’s M96/M97 engines are known for performance,
certain conditions can cause premature crankshaft wear or failure. Common
causes include:
- Oil
starvation leading to bearing knock and journal scoring
- High
mileage fatigue causing cracks or out-of-round journals
- Worn
or failed bearings damaging crankshaft surfaces
- Contaminated
lubrication accelerating wear on critical journals
- Overheating
compromising crankshaft strength
- Imbalance
due to previous machining or improper rebuild work
- Harmonic vibration intensified by worn flywheel or pulley components
Symptoms often include low oil pressure, knocking noises, metal debris in oil filters, engine vibration or difficulty maintaining consistent RPM.
Why You Should Replace a Worn Crankshaft
Replacing a damaged crankshaft with a precision-built, standard size replacement designed to match Porsche performance characteristics restores the reliability and durability required from the M96/M97 engine.
Key benefits include:
- Restored journal accuracy and correct bearing clearance
- Improved lubrication and oil pressure stability
- Smooth, balanced rotation across all RPM ranges
- Prevention of major bottom-end failures
- Enhanced reliability for road and performance driving
- Extended lifespan of rods, pistons, bearings and related components
For 996 and 997.1 owners, a correct standard-size crankshaft is vital to a successful and lasting engine rebuild.
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Fits:
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Diagram ref no 19
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*** to be used for code no: 0
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Click 'Zoom in' for large parts diagram.
Diagram ref no 11
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*** to be used for code no: 1
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