Cylinder head inlet valve kit, SET OF 4. Porsche 924S / 944 2.5L  ›  92810540902

This OE Match cylinder head inlet valve kit contains four inlet valves, it is intended for inlet valve renewal during cylinder head repair or overhaul.

Fits

• Porsche 924S - 1986 to 1988 (2.5L; covers 1986–87 and 1988 applications)
• Porsche 928 - 1978 to 1986
• Porsche 944 2.5ltr - 1982 to 1987 (8V)
  
  

Check fitment for your specific vehicle (model, year, engine) before ordering.

What This Product Does

Inlet valves control the entry of the air-fuel mixture into each combustion chamber. When closed against their seats, they help seal the cylinders during compression and combustion. Their condition should be assessed alongside the valve seats, guides and springs during cylinder head work.

Functions

• Control mixture admission during the inlet stroke.
• Close the inlet passages during compression and combustion.
• Provide replacement inlet valves for cylinder head refurbishment.
  
  

Technical Details

• Contents: four inlet valves.
• Installation location: engine cylinder head.
  
  

Symptoms of Fault

• Reduced or inconsistent cylinder compression.
• Leak-down testing indicating leakage through an inlet valve.
• Uneven idling or recurring misfires after ignition and fuelling checks.
  
  

These symptoms do not establish that the inlet valves need replacement. Inspection and testing should identify whether the fault involves valves, seats, guides or another engine component.

Why Replacement Matters

Worn, bent or damaged inlet valves can prevent the combustion chamber from sealing correctly. Renewing affected valves forms part of a cylinder head repair when testing and inspection confirm a sealing fault. Inspect neighbouring components while the head is dismantled so that unresolved wear does not require further strip-down work.

FAQs

Does this kit include every component needed for a cylinder head rebuild?
The stated contents are four inlet valves. Do not assume that guides, springs, stem seals, gaskets or fitting hardware are included; compare the contents with the planned repair.

What checks help identify an inlet valve problem?
Compression testing, leak-down testing and cylinder head inspection can help distinguish valve leakage from other causes of poor cylinder sealing.

Will new valves address smoke caused by worn guides?
Guide wear needs separate assessment. Replacing inlet valves alone does not address wear in the guides or valve stem seals.