Insert valve into guide. Valve stem end must be flush with guide. On account of differing stem diameters, only use inlet valve in inlet guide and exhaust valve in exhaust guide.
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Determine rock.
Wear limit
Inlet valve guide
Exhaust valve guide
0.80 mm
0.80 mm
Note
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If the wear limit is exceeded, repeat the measurement with new valves. Renew cylinder head if wear limit is still exceeded.
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If the valve is to be renewed as part of a repair, use a new valve for the calculation.