bracket Genuine Porsche part 99610202653

Code: 99610202653

Genuine Porsche part

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Crankshaft Standard (STD). Porsche 996 3.6L / 997.1 Carrera 3.6L / 3.8L 2005-08

99610201204/1

Product Information

Standard Size Crankshaft (STD)
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)

Diagram ref no 1

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.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99610201204

99610201204

99610201202

99610201203

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bracket Genuine Porsche part 99610202653