Oil pump seal ring. Porsche 911 / 964 / 993 / 996 / 997 / 914

Oil pump seal ring. 19.5 x 26
Large oil pump seal ( 19.5 x 26 mm) designed to exact Porsche specifications, this seal ensures a perfect fit between the oil pump and the engine block.
Sold each.

Fits:
Porsche 911 1965-89
Porsche 914-6 1970-76
Porsche 964 1989-94
Porsche 993 1995-98
Porsche 996 Turbo / GT2 2001-05
Porsche 996 GT3 3.6L 1999-05
Porsche 997.1 Turbo 3.6L 2007-10
Porsche 997.2 Turbo  3.6L 2011-13
Porsche 997 GT3 3.6L / 3.8L / 4.0L 2007-13

Diagram ref no  3

This component is an oil seal, often referred to as the “large oil pump / oil cooler seal.” Its job is to prevent oil from leaking at the joint between the oil pump (or oil cooler housing) and the engine block or other mating surface. It maintains pressure integrity within the oil circuit, preventing external leakage and loss of oil. A proper oil seal helps protect surrounding engine components (gaskets, housings) from oil contamination and keeps the lubrication system efficient.

Location: Mounted at the interface of the oil pump or oil cooler to the engine block — typically around a rotating shaft or coupling.
Function: Provides a leak-proof seal for high-pressure oil flow between engine and pump housing
Installation: Direct-fit OE replacement — replace whenever the pump or cooler is removed
Maintenance Tip: Always replace during engine rebuilds or if any oil seepage is detected near the cooler or pump area

Why replacement matters:
• Over time, the original seal can harden, crack, shrink, or wear due to heat, pressure cycles, vibration, and exposure to oil and contaminants.
•  A compromised seal allows oil to leak, reducing oil level, lowering system pressure, and potentially causing damage to engine internals.
•  Even small oil leaks can lead to oil contamination of belts, hoses, or nearby components, making clean-up costly and potentially damaging.
•  Replacing with a high-quality replacement seal restores full sealing integrity, ensuring proper oil circuit function, preventing leaks, and protecting the engine’s internals.

When to replace:
•  Whenever the oil pump or oil cooler is removed for maintenance, repair, or rebuild — always replace the seal rather than reuse an old one.
•  If you detect oil seepage or external leaks near the pump / cooler area, or during engine inspections.
• During major engine overhauls, rebuilds, or upgrades, especially in older or high-mileage engines.
• As preventive maintenance in high-stress or high-boost applications, where oil pressure and temperature are elevated.

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

99970417350

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