Engine cylinder cover base gasket. Porsche 993 RS  ❭  99970502341

Engine cylinder cover base gasket, 110.72 x 3.53.
Often referred to as a rubber seal ring or O-ring, it is designed to fit precisely in its designated groove where the rotating or stationary component meets a housing, providing a durable and leak-resistant interface.
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Fits:
Porsche 993 Carrera RS 3.7L 1995 - 1998

Diagram ref no 4

The sealing ring helps prevent oil, coolant or other fluids from leaking between closely fitted engine/transmission surfaces. It forms a compression seal around shafts or bores where fluid containment is critical. A properly functioning seal keeps fluids contained, minimizes the risk of contamination, and preserves lubrication where it’s needed most - such as around pistons, cylinders, or fluid passages.

• Application: Engine or drivetrain sealing ring used in cylinder base or other fluid interface points where a precise rubber seal is required to maintain fluid containment and mechanical integrity.

Replace this sealing ring if you notice:
•  Visible fluid leaks around engine or transmission joint areas
•  Low oil or fluid levels without external explanation
•  During engine or transmission removal and service
•   When original seals show visible wear, cracking, or hardening

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