Machining Valve Seats

Valve seats showing traces of wear or burnt spots can be machined until reaching wear limit depth "b". If depth "b" is exceeded the cylinder head must be replaced, since valve clearance could no longer be adjusted to specifications. Valve seat inserts cannot be replaced with normal worshop facilities.

If a valve seat has been machined, the valve adjusting screw must be replaced with adjusting screw 046 109 453 C (previously with white marking, now with no marking).

Valve Seats
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  • Matthias
    How much to fix bent or burnt valve on porsche carrera?
    2 months ago

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