Piston Ring Set. Porsche 964 Turbo 3.6ltr 1991-93  ›  PCG50399N0

Genuine Porsche Piston Ring Set.
Sold each - 6 required per car

Fits

• Porsche 964 Turbo 3.6L 1993 (M64.50)

What This Product Does

Installed within the grooves around the piston, the rings form the working seal between the piston and cylinder. They retain combustion pressure, manage the lubricating-oil film and conduct heat away from the piston.

Functions

• Maintains the seal around the combustion chamber
• Regulates oil remaining on the cylinder surface
• Reduces gas blow-by into the crankcase
• Conducts heat from the piston towards the cylinder

Technical Details

• Part number: PCG50399N0
• Supply quantity: one ring set for one piston
• Size specification: standard
• Engine applications: M64.50

A complete six-cylinder engine normally requires six individual sets. Confirm the quantity needed for the planned rebuild before ordering.

Symptoms of Fault

• Rising engine-oil consumption
• Blue smoke from the exhaust under acceleration
• Low or inconsistent compression readings
• Increased crankcase pressure and blow-by
• Oil deposits on spark plugs
• Loss of power associated with poor cylinder sealing

Similar symptoms may be caused by worn cylinders, damaged pistons, valve-guide wear or crankcase-ventilation faults. Compression and leak-down testing should form part of the diagnosis.

Why Replacement Matters

Damaged, worn or seized rings can compromise compression and oil control. When rebuilding the engine, inspect the pistons, ring grooves and cylinder running surfaces for wear, scoring and dimensional accuracy. Cylinder condition, ring end gaps, installation direction and operating clearances must comply with the applicable Porsche workshop specifications.

FAQs

• Does one set cover the complete engine?
  No. This product contains rings for one piston; six sets are generally required for the complete six-cylinder engine.
• Are these oversized piston rings?
  No. The supplied rings are standard size for a nominal 100 mm bore.
• Should the cylinders be checked before fitting?
  Yes. Measure each bore and inspect its surface finish to establish whether standard-size components remain suitable.
• Can rings be renewed without inspecting the pistons?
  No. The piston grooves, lands and related cylinder surfaces should be assessed as part of the rebuild.

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Related, superseded, cross reference or alternative numbers for comparison.

PCG50399N0

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