Volkswagen Workshop Service and Repair Manuals > Polo Mk4 > Engine | 4 - Cyl. injection engine | Engine cylinder head, valve gear | Valve control mechanism - repair | Valve seats - rework | Calculate the maximum admissible grinding elevation as follows:

Calculate the maximum admissible grinding elevation as follows:

–	Fit the valve and compress it firmly against the valve seat.

Note

If the valve is replaced during repairs, use a new valve to carry out the measurement.

–	Measure the distance -a- between valve stem end and the seating surface of the engine head cover.

–	Calculate the maximum admissible grinding elevation from the distance measured -a- and the minimum elevation.

Minimum measurements: Intake valve 33.8 mm, exhaust valve 34.1 mm.

Distance measured -a- minus minimum distance = maximum grinding measure permissible.

Example:

-	Distance measured -a- Minimal elevation	35,1 34,1	m mm
=	Maximum grinding elevation allowed*	1,0	mm

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