| If no perfect contact pattern is achieved by grinding in the valves, rework the valve seats. |
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| When carrying out repairs on engines with leaking valves, it is not sufficient to replace the valves and to machine 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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| 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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| Rework valve seats only sufficiently in order to obtain a proper contact pattern → Chapter. |
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| Valves must not be reworked. Only grinding in of valve seats with grinding paste is permissible → Chapter |
| Special tools and workshop equipment required |
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| Device for reworking valve seats |
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