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On some old overhead-cam engines you can adjust the shims to a limited extent by screwing up a wedge over them, through a small hole. Turn the screw with an Allen key; if its full travel does not alter the gap enough, the shim must be replaced in a garage.

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Checking and adjusting valves

Overhead valves with rocker shaft On a pushrod engine with a rocker shaft, the adjusting screw a...