Valve seats, reworking: Notes

Special tools, testers, measuring instruments and auxiliary items required

NOTE:

When repairing engines with leaking valves, it is not sufficient to reface the valve seats and replace the valves. The valve guides must also be checked for wear. This is particularly important on high mileage engines. Refer to Valve guides, checking .
Only rework the valve seats as far as is necessary to ensure a good seating pattern.
Before starting to rework the valve seats, calculate the maximum permissible reworking dimension.
If the maximum reworking dimension is exceeded, the hydraulic valve lifters will not work properly and the cylinder head will have to be replaced.