In order to keep the rocker arm in place under all circumstances, a spring washer was fitted.
For a complete overhaul, you can't keep worn out parts in place. The spring washer (locking washer) has lost its resilience over the years, so it is recommended to replace it together with the thrust washers (see Options tab).
For each rocker arm, you need one spring washer, to replace all spring washers on all rockers, you need a total of eight.
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