Adjusting clearances in valve mechanisms of 6- and 8-cylinder engines (Mercedes-Benz S-Class W116)

The gap is measured between the working surfaces of the rocker arm and the camshaft cam. In a six-cylinder engine, it is necessary to remove the spring and the rubber seal of the spark plug hole. When adjusting, the nose of the corresponding cam should be directed upwards, as shown in Fig. 98 for an eight-cylinder engine and in Fig. 99 for a six-cylinder engine. A flat feeler gauge is used for measurement. The gaps should be checked after 20,000 km of vehicle mileage. It is advisable to use a set of special keys to adjust the gaps (N110 589 00 100).





Remove the air filter.



Remove the cylinder head cover.

Check that the ignition is off, disconnect the green wire from the ignition distributor from the ignition control unit or remove the center wire from the ignition distributor.

Place a size 27 socket wrench with a ratchet on the head of the crankshaft pulley mounting bolt and rotate the crankshaft until the valves of the first cylinder are completely closed.

Adjust the required clearance using keys by turning the adjusting bolt in the lever support. If adjustment is not possible, replace the pusher on the spring plate. Pushers are supplied in different heights.

Insert a feeler gauge of the required thickness into the gap (see data in tables), as shown in Fig. 100, adjust the clearance with the adjusting bolt so that the feeler gauge moves tightly between the working surfaces and tighten the nut. Clearance adjustment can be made both on hot and cold engines.



Turn the crankshaft half a turn and adjust the valve clearance of cylinder 3.

Article text obtained from the website MERCEDESMAN



Turn the crankshaft half a turn and adjust the valve clearance of the 4th cylinder.

Turn the crankshaft half a turn and adjust the valve clearance of cylinder 2.

Perform the remaining work in reverse order.