Cylinder Head Copper Base Gasket 0.50mm. Porsche 911  ›  90110419102

This 0.50 mm copper cylinder-head base gasket by Porsche is intended for selected early Porsche 911 engine applications from 1965 to 1973, including specified 2.0L, 2.2L, 2.4L and 2.7L RS variants. It is used within the cylinder and cylinder-head assembly during engine rebuilding or sealing work.

Fits:
Porsche 911 1965-73

Diagram ref no: 26

What This Product Does

The gasket provides a precisely sized sealing layer at the cylinder base. Its specified thickness helps maintain the intended cylinder installation dimensions while sealing the joint against oil leakage. Correct gasket selection is important whenever cylinders are removed, inspected or refitted during an engine overhaul.

Functions

• Seals the joint at the base of the engine cylinder
• Supports the specified cylinder installation height
• Helps prevent oil seepage from the cylinder-base area
• Provides a replaceable sealing surface during engine assembly
• Supports accurate reassembly of the cylinder and piston installation

Technical Details

• Manufacturer: Porsche
• Reference number: 90110419102
• Material: copper
• Specified thickness: 0.50 mm
  
  

Symptoms of Fault

• Oil seepage visible around the cylinder-base joint
• A flattened, marked or damaged gasket found during dismantling
• Persistent engine oil leakage after accessible external seals have been checked
• Incorrect cylinder installation measurements during an engine build
• Evidence of fretting, corrosion or an uneven sealing surface when the engine is stripped

Why Replacement Matters

A compressed or damaged base gasket may no longer seal consistently after the cylinder has been removed. Renewing the gasket during rebuilding helps reduce the risk of repeat oil leaks and avoids another engine strip-down to correct a compromised joint. The 0.50 mm specification should only be used where it matches the engine configuration and measured build requirements. Related sealing surfaces, cylinders, pistons, rings and engine hardware should also be inspected while access is available.

OE Reference

• 90110419102
• 901 104 191 02
• 901.104.191.02

FAQs

• When should this gasket be renewed?
  It is normally replaced when the relevant cylinder is removed during an overhaul, or when damage or leakage is found at the base joint.
• Can a different gasket thickness be substituted?
  The selected thickness affects engine assembly dimensions. Use the specification required by the engine configuration and measured rebuild clearances.
• What should be checked at the same time?
  Inspect the sealing faces, cylinders, pistons, rings, oiling system and associated hardware before reassembly.
• Does every oil leak indicate a failed base gasket?
  No. Oil can travel from other seals or joints, so the source should be confirmed before dismantling the engine.

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

90110419102

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