In this guide, you will learn how to manually rotate (turn over) the crankshaft on Mercedes-Benz engines.
To manually crank a Mercedes-Benz engine you will need:
You will need to apply a considerable amount of force. V8 and V6 engines are harder to turn over than V6 and 4 cylinder engines. Also note that as the various cylinders reach the Top Dead Center (TDC), turning the crankshaft will get harder then easier once past the TDC.
If you are having a hard time turning over the engine, remove the drive / serpentine belt and try again. If it is still difficult to manually crank your Mercedes-Benz engine, remove the spark plugs. If your crankshaft won't turn, then you most likely have a mechanical problem.
This is often necessary if your Mercedes does not start and you want to verify that the engine is not seized or locked up.
This procedure is also required for a number of maintenance procedures including for changing the timing chain, check for timing chain wear, time injection pump, camshaft replacement etc.
If your engine will not turn over, in most cases it is due to mechanic problems.
Typical problems that can prevent a car from turning over include.