| If no perfect contact pattern is achieved by grinding in the valves, rework the valve seats. |
| Special tools and workshop equipment required |
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| Device for reworking valve seats |
Note | t
| Do not remill valves. Only grinding in of valves is permissible. |
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| When carrying out repairs on engines with leaking valves, it is not sufficient to replace the valves and to rework the valve seats. It is also necessary to inspect the valve guides for wear, particularly on engines with a high mileage → Chapter. |
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| Calculate the maximum permissible reworking dimension before reworking the valve seats → Chapter. |
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| Rework valve seats only sufficiently in order to obtain a proper contact pattern. |
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| If the reworking dimension is exceeded, proper operation of the hydraulic valve clearance compensation is no longer assured and the cylinder head must be replaced. |
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