| Special tools and workshop equipment required |
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| Valve seat refacing tool |
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| When repairing engines with leaking valves, it is not sufficient to replace valve seats and valves. It is particularly important on high mileage engines to check the valve guides for wear. |
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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 replaced. |
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