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One of the routine maintenance items that you should perform on your Mercedes-Benz is the checking and replacement of your serpentine belt. The belt is driven off of the crankshaft and turns the water pump, fan clutch, alternator, and air conditioning compressor. The belt should be checked periodically (every 3,000 miles, or when you change your oil).

The M104 engine uses what is known as a poly-ribbed belt (having many channels or ribs on the underside of the belt). The poly-ribbed belt setup utilizes a spring-loaded belt tensioner pulley that provides the proper tension for the belt at all times, making adjustment unnecessary.

When inspecting your belt, the one thing that you want to look for is cracks on the underside of the belt. If you see any cracks at all, you should replace your belt immediately. On the outside of the old belt will be a number that indicates the width and the length of the belt. Use these numbers when ordering a new belt to make sure the replacement is the same as the old one.

Are you ready to change your belt? Shop here for the correct belt for your W210 Mercedes-Benz.

Check out our step-by-step instructions here:
W210 Serpentine Belt Replacement

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