964

1989-1994 / Coupe / Targa / Cabriolet / Germany

Critical Engine

3. Oil Leaks (Cylinder Base Gaskets)

Symptoms

Oil around the cylinder bases, dripping down the engine. In severe cases, oil loss between services.

Cause

The M64's cylinders are sealed to the crankcase with rubber O-rings. Over time and through thermal cycling, these O-rings harden, crack, and lose their seal. High mileage and overheating episodes accelerate the deterioration.

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// More 964 problems

Other known issues

Common Engine

1. Oil Leaks (Chain Tensioner Housings)

Oil residue on the engine's lower surfaces, oil drips on exhaust components (burning oil smell), oil spots beneath the car.

Common Engine

2. Oil Leaks (Cam Cover Gaskets)

Oil on the cylinder heads and barrel surfaces, burning oil smell from exhaust contact.

Minor Engine

4. Timing Chain Tensioner Failure

A rattling noise from the front of the engine on cold start-up (chain slap). Erratic idle. In advanced cases, a metallic rattling that worsens with engine speed.

Minor Engine

5. Engine Bay Fires

Burning oil smell from the rear of the car (this is the warning sign). Smoke from the engine bay.

Common Engine

6. Distributor Drive Belt Failure

Sudden misfiring, rough running, or complete engine failure (no spark). If the belt has slipped rather than broken, the ignition timing will be incorrect, causing poor performance and potential backfiring. ---

Common Drivetrain

7. Dual-Mass Flywheel Failure

Rattling or chattering noise from the bellhousing area at idle, which disappears when the clutch pedal is depressed. Shudder on clutch engagement, particularly from a standstill. Vibration through the drivetrain at certain RPM ranges.

All 964 problems