| Special tools and workshop equipment required |
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| Valve seat refacing tool |
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| Do not machine the valves. They may only be reworked. |
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| When repairing engines with leaking valves, it is not always sufficient to reface or renew valve seats and valves. It is also necessary to check the valve guides for wear. This particularly important on high mileage engines. |
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| The valve seats should only be reworked just enough to produce a perfect seating pattern. The maximum permissible reworking dimension must be calculated before reworking commences. If the reworking dimension is exceeded, the function of the hydraulic tappets can no longer be guaranteed and the cylinder head should be renewed. |
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