How to replace the timing sprocket of Mercedes-Benz ML400

The timing sprocket is badly worn and needs to be replaced, which will lead to the disappearance of meshing or the slipping of the timing chain.

The disassembly method of the timing sprocket is as follows: remove the negative battery grounding wire, remove the front cover of the engine and the parts that hinder the operation, rotate the 1 cylinder piston to the compression top dead center position, and align the timing marks on the camshaft and crankshaft sprocket. There are two timing marks on the camshaft sprocket. One is the timing mark of 1 cylinder piston at top dead center. At this time, the intake valve and exhaust valve of 1 cylinder are in the closed position. Be sure to find out which cylinder piston is in the compression top dead center position, remove the bolt on the camshaft sprocket, remove the timing chain and camshaft sprocket, and if it is necessary to replace the crankshaft sprocket, remove the sprocket with a puller. When installing a new sprocket, align the chain with the chain groove to prevent looseness.