Exhaust valve guide. Porsche 996 Carrera 3.4L & 3.6L / Boxster 986 2.7L & 3.2L  ❭  99610414503

Valve guide - Exhaust
The Genuine Porsche 99610414503 exhaust valve guide is an OE cylinder head component for selected Porsche 996 3.4L / 3.6L and 986 Boxster 2.7L / 3.2L engines. It guides the exhaust valve stem, supports correct valve movement and helps restore factory valve train function during cylinder head repair or engine rebuild work.
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Fits:
Porsche 996 Carrera 3.4L 1997 - 2001 (Engine code: 9601 / 9602 / 9604)
Porsche 996 Carrera 3.6L 2002 - 2005 (Engine code: 9603)
Porsche 986 Boxster 2.7L 2002 - 2004 (Engine code: 9623)
Porsche 986 Boxster 3.2L 2002 - 2004 (Engine code: 9624)

Diagram Ref No 4

This part is used during cylinder head repair, valve train service or engine rebuild work on selected Porsche flat-six engines.

What This Part Does / Functions
•  Guides the exhaust valve stem within the cylinder head
•  Helps maintain correct exhaust valve alignment
•  Supports smooth valve opening and closing
•  Helps control valve stem movement and wear
•  Works with the valve stem seal to help control oil consumption
•  Supports correct valve seating and combustion sealing
•  Replaces a worn, loose, damaged or out-of-specification valve guide
•   Provides correct OE Porsche material, dimensions and fitment.

Why Replace This Part?
Exhaust valve guides are exposed to high exhaust temperatures, valve movement, combustion heat and long-term engine wear. Over time, the guide can wear internally, allowing excess valve stem movement. Worn valve guides may contribute to oil consumption, exhaust smoke, poor valve sealing, valve train noise or reduced engine performance. Replacing the guide with a Genuine Porsche OE exhaust valve guide helps restore correct valve stem support and factory cylinder head specification during engine repair or rebuild work.

Common Symptoms of Worn Valve Guides
•   Excessive oil consumption
•   Blue smoke from the exhaust
•   Worn or loose exhaust valve movement
•   Poor valve sealing or compression issues
•   Valve train noise
•   Carbon build-up around exhaust valves
•   Failed cylinder head inspection
•   Engine rebuild requiring valve guide renewal.

When to Replace This Part
•   During cylinder head overhaul
•   During engine rebuild or top-end repair
•   If the exhaust valve guide is worn beyond tolerance
•   If valve stem-to-guide clearance is excessive
•   If the guide is cracked, loose or damaged
•   When replacing exhaust valves and related valve train parts
•   If oil consumption or exhaust smoke is traced to worn guides
•   When restoring the engine with Genuine Porsche OE components.

Where It Fits on the Car
This valve guide is fitted inside the engine cylinder head, in the exhaust valve guide bore. It supports the exhaust valve stem and works with the valve, valve spring, valve stem seal and cylinder head seat. Installation requires specialist cylinder head equipment and machining procedures. Valve guide replacement should be carried out by an experienced engine builder or Porsche specialist.

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

99610414503

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