Mercedes-Benz W210 timing chain and chain tensioner (M111, M104)
My W210 M111 timing chain rattles, is it worn?
The chain is usually worn only after more than 400,000 km. If the chain really makes noise, replace the chain and the tensioner together. The rattle can also come from the serpentine belt tensioner's damper, so locate the noise before replacing the chain.
What should you note when installing the chain tensioner on the M111?
The oil-pressure-operated tensioner must be pushed back to its starting position before installation. Otherwise it settles too long and the chain becomes too tight. A chain that is too tight can break the camshaft or the chain.
What should be checked when replacing the timing chain?
There are two chain types, and a chain of the wrong type does not fit. The correct chain is ordered with the car's VIN. During installation, the marks of the crankshaft and camshafts are aligned according to the instructions, and the camshafts can be locked with pins.