| Special tools and workshop equipment required |
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| Valve seat re-facing tool |
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| When repairing engines with non airtight valves, it is not enough to reface or to replace the valve seats and the valves. The valve guides must also be checked for wear. This is particularly important on high mileage engines → Chapter. |
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| The valve seats should only be reworked just enough to produce a good seating pattern. Before re-facing, the max. allowable re-facing value must be calculated. If the reworking dimension is exceeded, hydraulic valve compensation can no longer be guaranteed and the cylinder head should be renewed. |
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