Mercedes W204 Belt Diagram (2024)

FAQs

How do you find the serpentine belt diagram? ›

Some vehicles have the serpentine belt diagram located on a decal somewhere in the engine compartment. But if your car does not have a decal, you can easily look up the diagram in a repair manual or repair database. Another option is to take a photo of the old belt before removal.

Your timing belt should be replaced anywhere from 40,000 to 60,000 miles and your serpentine belt should be replaced anywhere from 30,000 to 60,000 miles. We recommend consulting your owner's manual for Mercedes-Benz year, model, and trim specifications.

The Mercedes-Benz C-Class (W204) is the third generation of the Mercedes-Benz C-Class. It was manufactured and marketed by Mercedes-Benz in sedan/saloon (2007–2014), station wagon/estate (2008–2014) and coupé (2011–2015) bodystyles, with styling by Karlheinz Bauer and Peter Pfeiffer.

A: Commonly a belt routing diagram sticker is on the underside of the hood or in the engine compartment. If there is no diagram, make a sketch of the belt and pulleys before removing the belt. This will help you re-route the new belt correctly.

You can replace only the pulley, or you can buy a new tensioner with a new pulley attached, or you can buy a kit with a new belt, tensioner/pulley, and idler pulley if there is one, and do it all.

Always consult an owners guide for the proper tension range. You should always use a Belt Tension Tool and refer to the manufacturer's specs for each belt. Now for reality, you don't have one… A good “Rule of Thumb,” seek approximately ½ Inch of deflection for a V-belt.

Misalignment pulleys or tensioner: If the belt is not properly aligned on the pulleys, it can wear unevenly or slip off entirely, leading to its premature failure. This situation usually happens if some of the components have been previously removed, replaced, and not returned in to place properly.

Place the large end of the tool onto the belt at the center of the span. Apply a sufficient force to deflect the belt until the large O-ring is in-line with the other belts. If this is a single-belt drive, use a straight-edge or taught string for a “starting point” reference.

Labor costs are estimated between $54 and $68 while parts are priced between $43 and $75. This range does not include taxes and fees, and does not factor in your unique location.

The serpentine replacement interval is about every 60,000 – 100,000 miles. Because of their rubber material, serpentine belts will crack, peel, and wear down over time.

What are the symptoms of a bad serpentine belt? ›

The reliability has been really good with only the common faults really being an issue for me: 1 Fuel injector gave in and stopped partially working putting the car in limp mode.

C-Class models are expected to have a maximum lifespan of 200,000 miles. The Mercedes Benz E-Class, on the other hand, usually lasts closer to 250,000 miles. Of course, it's still crucial for all drivers to keep up with regular maintenance needs to keep your car on the road for as long as possible.

This industry standard number, frequently denoted as the “PK” number, is printed next to the manufacturer's part number on almost every serpentine belt produced, and can be seen in the examples below. WHAT IS A “PK” NUMBER? A “PK” number is a worldwide standard metric belt measurement printed on most serpentine belts.

You can find the correct size of serpentine belt for your car in the owner's manual or by using an online belt sizing tool. If you are unsure about the size of the serpentine belt you need, it is best to consult a mechanic or an auto parts store.

The serpentine routing is mainly used to compensate the parts with less delay in the "same group of related" signal lines.

Check if the belt runs centrally on the pulleys. Any sideward movement or slippage can indicate misalignment. Straightedge or String Line: Place a straightedge or taut string along the faces of the pulleys to see if they line up perfectly. Any deviation from a straight line suggests angular or parallel misalignment.