2009 Mercedes C300 Belt Diagram (2024)

FAQs

Where is 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.

Labor costs are estimated between $93 and $118 while parts are priced between $29 and $42. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed. For a more accurate estimate based on your location, use our Fair Price Estimator below.

Most Mercedes-Benz's have 1 or 2 drive belts and in some instances, it may be called a serpentine belt. The belt needs to be flexible to circulate across pulleys and can be made out of perishable compositions like rubber, neoprene or urethane. The drive belt belt/s is positioned on pulleys and operates under tension.

Where can I find a belt routing diagram for my engine? A: Commonly a belt routing diagram sticker is on the underside of the hood or in the engine compartment.

The average cost for a Mercedes-Benz E320 Serpentine Belt Replacement is between $97 and $143. Labor costs are estimated between $54 and $68 while parts are priced between $43 and $75.

Serpentine belts usually last about 50,000 miles or five years, or in some cases, even up to 100,000 miles. Your belt should be inspected at 50,000 miles, as this is often when you start to see the belt material breaking down.

Cars with a timing belt have a plastic cover near the engine block (often to the left-hand side), which provides easy access to the belt. It needs changing at regular intervals, which is why the removable cover is necessary. In cars with a timing chain, you won't see a plastic cover.

Replacing the serpentine belt is as simple as threading it into position, cranking the tensioner and slipping the belt over the tensioner pulley, or nearest pulley up top. Belt tensioners are mostly spring tension. Once installed, the spring retains pressure to the belt.

The second, and lesser known one, is a global industry standard number that indicates the size of the belt. 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.

How do I know which serpentine belt to buy? ›

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.

Whether you go to the mechanic or do it yourself, replacing a serpentine belt costs $58 to $126. The price of a serpentine belt starts at around $25 and goes up to $75 at most. It typically takes about an hour to replace the serpentine belt, and if you know some car repair basics, you could change the belt yourself.

The serpentine belt, driven by the crankshaft pulley, is connected to the engine. From there, it wraps around multiple other pulleys that power different components in the engine, such as the alternator, air conditioning compressor, power steering pump, and water pump.

Since an overheated engine can be due to several different serious causes, you'll want to have your car inspected as soon as possible. You spot visual signs of wear: Cracks, splits, and fraying are visual indicators of a worn belt. If the belt's sides are glazed over, the belt won't last much longer.