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91110751200/1
Product Information
Product Information
Oil pressure relief piston
This OE Match oil pressure relief piston is a replacement piston used in the engine crankcase oil pressure relief system. It is designed to match the original Porsche-style fitment and helps regulate oil pressure within the engine lubrication circuit.

Fits:
Porsche 911/930 1974 - 1989
Porsche 964 1989 - 1994
Porsche 993 1995 - 1998
Porsche 996 Turbo / GT2 2001 - 2005
Porsche 997 Turbo / GT2 2005 >>
Porsche 996 GT3 / 997 GT3

Diagram ref no 16

The oil pressure relief piston works with the relief spring and guide components inside the engine block/crankcase. Its job is to help control excess oil pressure by allowing oil to bypass when pressure reaches the required limit, protecting the lubrication system and helping maintain consistent oil flow to critical engine components.

Functions
•  Helps regulate engine oil pressure
•  Works with the oil pressure relief spring and guide sleeve
•  Helps protect the engine from excessive oil pressure

•  Supports correct oil flow through the lubrication system
•  Helps maintain reliable lubrication of bearings and internal engine parts
•  Provides an OE Match replacement for the original relief piston
•  Suitable for engine rebuilds, crankcase service, and oil pressure repairs

The oil pressure relief piston is exposed to constant oil flow, heat, pressure, and engine wear particles. Over time, the piston can become scored, worn, sticky, or damaged, which may affect oil pressure regulation. A worn or sticking piston can contribute to low, high, or unstable oil pressure, so replacement is recommended during engine overhaul or when oil pressure control issues are being investigated.

When to replace
•   Oil pressure is too high, too low, or unstable
•   The original piston is scored, worn, sticking, or damaged
•   The engine has suffered internal wear or contamination
•   The crankcase oil pressure relief system is being serviced
•   The oil pressure relief spring, guide sleeve, or plug is being replaced
•   The engine is being rebuilt or overhauled
•   There are concerns about correct lubrication system operation

Where it fits on the car
This piston fits inside the engine crankcase/oil pressure relief valve assembly. It sits in the crankcase and is used with the relief spring and guide sleeve to control oil pressure in the engine lubrication system.



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

91110751200
91110751200

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