Volkswagen Workshop Service and Repair Manuals > Polo Mk4 > Engine | 4 - Cyl. diesel engine (with distributor injection pump) | Engine cylinder head, valve gear | Valve mechanism - repair | Valves - grind seats | Calculate maximum permissible grinding as follows:

Calculate maximum permissible grinding as follows:

–	Place valve and press it against valve seat.

Note

If, as part of repair, valve is replaced, use new valve for the measuring.

–	Measure distance -a- between stem end and head upper shoulder.

–	Calculate maximum permissible grinding using the measured distance -a- and minimum measure.

Minimum measures: Intake valve 35.8 mm Exhaust system valve 36.1 mm

Measured distance minus minimum measure = maximum permissible grinding measure.

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