What happens to the serpentine belt on a Mercedes Benz?

The serpentine belt powers every accessory on the engine. When it wears, belt slip occurs and it will decreases the A/C, power steering, and charging system performance. Continue reading to find out how to replace the serpentine belt on your Mercedes-Benz C-Class. This article applies to the Mercedes-Benz C-Class w204 (2007-2014).

When does a Mercedes C Class belt break?

When it wears, belt slip occurs and the belt will eventually break. A simple check of the belt’s condition (cracks or discoloration) will be prevent you from encountering a broken belt. This article applies to the Mercedes-Benz C-Class w204 (2007-2014).

How do you remove tension from a serpentine belt?

Turning the tensioner counterclockwise to remove tension from the belt. Begin by routing the serpentine belt in the correct path around the pulleys. Make sure the last pulley you will be sliding the belt onto does not have raised edges; otherwise, it will be difficult to slide on.

Where is the serpentine belt tensioner on the M271?

The serpentine belt tensioner on the M271. The green circle indicates the T55 slot to move the tensioner. The 272 will require you to remove the front engine cover. Simply pull forward and up to detach it. You will hear the four plastic clips on the bottom side of the cover pop free.

How long does it take to replace V belt on Mercedes W203?

Replacing the belt on your Mercedes-Benz W203 is one of the easiest jobs you will do. You should be able to do it in less than 30 minutes and is a great starter project if you are just beginning to DIY or “Do It Yourself” on your car.

What’s the best way to install a new belt?

You can also lock the tensioner into the open position if you need both hands to install the new belt. Turn the tensioner all the way counter-clockwise and insert a retaining pin between the rotating part and the tensioner base.

Where is the poly’v’belt on a Mercedes?

This is supported by 3 X 8mm speed bolts. it is shown as positioned on the underside of the car . As can be seen once the under floor cover is removed the belt and pulleys can be seen however there is little doubt that the space between the chassis and the poly ‘V’ belt pulleys is very tight.

What to look for in a Mercedes a class belt?

Close inspection of the bearing shows that part of the bearing cage and ball bearings are missing. The poly ‘V’ Belt should be inspected for wear and damage on every ‘B’ Service. Check the belt throughout the entire length inspect for cracks in the structure of the belt.

How to replace serpentine belt on Mercedes C-class?

Begin by routing the serpentine belt in the correct path around the pulleys. Make sure the last pulley you will be sliding the belt onto does not have raised edges; otherwise, it will be difficult to slide on. The belt may need to be pulled with some force to make it slide onto the tensioner pulley.

Can you change the belt on a Mercedes ML350?

It is possible to change the belt without using a locking pin. Take a picture of the belt routing before you remove the belt. Do not use the Secure Torx bolt to release the tensioner. If you have a turbo intake pipe, remove it to access the tensioner. The original belt can possibly last up to 100k miles.

What’s the best way to replace a serpentine belt?

Auto tensioners have either a hole that will fit a half inch drive ratchet, or a bolt you can use a socket to apply pressure to. Insert the wrench or place the socket over the bolt on the tensioner and twist it away from the belt to relieve the tension on it.

Where do I find the serpentine belt routing diagram?

Find the serpentine belt routing diagram. Many cars come with a sticker in the engine bay that shows exactly how the serpentine belt is supposed to be routed through the various pulleys on the engine. If your vehicle does not have a sticker, you will need to find another way to remember how the belt should be run.

How is the tension set on a serpentine belt?

Depending on the application, your serpentine belt will either have tension placed on it using a movable bracket or an auto tensioner pulley. This pulley uses an internal spring to apply consistent pressure to the belt at all times. If your vehicle does not have a tensioner pulley, the alternator bracket is likely how tension is set on the belt.

How do you remove a serpentine belt from a Mercedes Benz?

Use a 15mm socket to rotate the tensioner pulley clockwise. This will loosen the serpentine belt and allow you to remove the belt from the alternator pulley. In this picture, you are looking down at the ratchet sitting on the tensioner nut. Now remove the old belt.

What happens when you loosen a serpentine belt?

If your vehicle uses the alternator bracket to apply tension to the belt, loosen the two bolts that pass through the long eyelets on the bracket. As you loosen the bolts, the tension on the belt will likely move the alternator toward the engine and relieve the pressure. Loosen the bolts enough to move the alternator, but don’t remove them.

What kind of belt does Mercedes Benz M104 use?

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.

What kind of pulley does a serpentine belt use?

Determine if there is a belt tensioner pulley. Depending on the application, your serpentine belt will either have tension placed on it using a movable bracket or an auto tensioner pulley. This pulley uses an internal spring to apply consistent pressure to the belt at all times.

Where do I find the serpentine belt on my car?

To access the serpentine belt, you will need to open the hood of the vehicle. The hood release can usually be found near the door on the driver’s side of the vehicle. With the hood released, you will also need to release the safety latch located at the front of the vehicle.

How often should a serpentine belt be replaced?

Most serpentine belts need to be replaced every 40,000 to 70,000 miles. If there are signs of the belt rubbing on something, make sure to identify and repair whatever it was rubbing on to avoid damaging the new belt.

How do you remove a serpentine belt from a battery?

Use the appropriate sized wrench or socket to loosen the nut holding the black ground cable on the negative terminal of the battery. Slide the cable off of the terminal and tuck it to the side of the battery. You will not need to disconnect the positive terminal. Locate the serpentine belt.

Where is the power steering drive belt located?

The belt that drives a power-steering hydraulic-fluid pump is usually at the front of the engine , turned by a pulley on the crankshaft . It is generally separate from the belt that drives the water pump and alternator , but it may drive other components as well as the power-steering pump .

How can I Stop my power steering belt from slipping?

A slipping belt sometimes gives itself away by a loud screeching noise, particularly when you start the engine from cold. The tension of the belt can be adjusted to stop it slipping. The pump is pivoted so that you can swing it in or out from the engine to adjust the belt tension. Moving the pump away from the engine increases the tension.

How to check the tension on a power steering belt?

To check the tension, lay a straight-edge along the outer edge of the belt. If the belt goes round more than two pulleys, use the longest run of the belt. Use your thumbs to push the belt inwards at its mid point, pushing quite hard.

Can a serpentine belt cause a power steering malfunction?

Some cars will have just 1 belt that snakes its way through all the pulleys on your engine, called a serpentine belt while other vehicles will have individual belts for each accessory. In either case, if this belt gets frayed, glazed or breaks altogether, it will definitely cause your power steering system to malfunction.

What causes a power steering pump to stop working?

If you have a sudden loss in power steering in your vehicle, a broken belt is a likely cause. If you simply have a squeaking belt, the problem may be an easy fix. For a great explanation of your power steering pump, visit this How Stuff Works page for a detailed explanation!

Why are the bearings on my power steering worn out?

The bearing supports the shaft that connects the pulley outside the pump to the impeller inside the pump. After miles of use, it is not unusual for these bearings to wear out.

What kind of nut does a serpentine belt use?

Small punch, cotter pin, rivet, carpentry nail etc. There are two styles of serpentine belt tensioners. The earlier (112,113 engines) style has an E10 bolt, while the newer (272,273 engines) uses a 17mm nut for adjustment.

How does the serpentine belt work on a Mercedes Benz?

This article applies to the Mercedes-Benz E-Class and C-Class (2002-2014). The serpentine belt uses tension to turn the pulleys on the A/C compressor, power steering pump, and alternator. The serpentine belt tensioner has a built-in spring, keeping the belt at the proper tension while the engine is running.

Where does the bypass belt go on a Mercedes Benz?

The bypass belt will go straight from the crank pulley (#1) to the power steering pump (#3). It will just clear the top of the A/C compressor pulley (#2). As for replacing the compressor, If it’s actually the compressor pump that is the problem, you will have to recharge the system because removing the compressor does open it.

How big is the test belt on a Mercedes Benz?

The length specified in the manual for the short test belt is 2315 mm, or 91.14 inches, so the 91 inch Duralast belt works fine. I used this to get my car back home when the compressor seized a couple hundred miles from home. Works great.

Where to get a serpentine belt for an AC compressor?

Go to an auto parts store and get them to lookup the belt you need. Then, used the old belt to measure the circuit without driving the compressor. Serpentine belt part numbers are based on length and number of ribs. Once you know the length you need w/o the compressor, they should be able to get you one that will work.

What are the components of a serpentine belt?

Some of the components driven by a serpentine belt are an air pump, water pump, power steering, air conditioner, and most importantly the alternator. The Serpentine belt is controlled by either a serpentine belt tensioner or an idle pulley. How does a serpentine belt differ from traditional belt driven engines?

When was the new serpentine car belt invented?

The new serpentine belt, which was invented in 1979 is a much wider belt then the traditional automotive belt. This wider belt can be put under much tighter tension, which removes a lot of slippage and friction experienced by older belt systems.

How much does it cost to replace a Mercedes C300 serpentine belt?

The average cost for a Mercedes-Benz C300 serpentine belt replacement is between $103 and $133. Labor costs are estimated between $76 and $96 while parts are priced between $27 and $37. Estimate does not include taxes and fees.

What happens when you wear the serpentine belt?

How to replace V belt on Mercedes W203?

With the hood open all you need is an E10 (reverse Torx socket) and driver. Locate the tensioner and using the Torx driver turn it counter-clockwise 45 degrees. You can now slip the belt off the tensioner and install the new one.

What kind of engine does a Mercedes 100 d have?

Cars belonging to Mercedes-Benz 100 D Kombi II Long submodel, manufactured or offered in the years 1987-1995 with cargo van body type, equipped with engines of 2399 cc (146.6 cui) displacement, delivering 53 – 55 kW (72 – 75 PS, 71 – 74 hp) of horsepower:

When did the Mercedes Benz 100 D 631 series come out?

Mercedes-Benz 100 D 631 seriesspecifications: versions & types Mercedes-Benzmodel 100 D 631 seriesbelongs to van commercial vehicle class. Represents the “commercial motor vehicles” market segment. The car was offered with minibus, cargo van body shapes between the years 1987 and 1995.

What kind of engine does a Mercedes C class have?

When this happens, you lose power assisted steering, air conditioning, and your charging system will no longer be operational. The M271 (4-cylinder) is found in the C180, C200, and C250. The C230, C300, and C350 is found with the M272 (6-cylinder) engine.

How to replace alternator on Mercedes Benz E C CLK SLK s?

Tighten the nut for the electrical cable ( positive +) between 15-18Nm. Plug the electrical cable on the back of alternator and make sure it clicks when you push it in. That way you know it is locked in place. Reinstall the serpentine belt, the engine cover and the reconnect the battery. 2 Bolts that hold the alternator in place. Max 45 Nm.

Where is the battery located on a Mercedes Benz E C CLK?

Depending if you have a C / E / CLK class it could be either in the engine bay compartment, under the rear seats, or in the trunk. In our case we are working on a C Class W203 2001-2007 and the battery is located in the engine bay. First we need to remove the cabin air filter housing.

Where can I find a serpentine belt routing diagram?

Select the specific year and make of your vehicle. Take note of the Illustration number and then Scroll to the bottom of the page to find your Free Serpentine Belt Routing Diagram. What’s that squeal coming from under the hood?

Which is the smooth side of the serpentine belt?

The kind of serpentine belt diagrams you will see on our site will be easily understandable diagrams for your make and model vehicle. The serpentine belt track to the right uses a tensioner and is from a 7.4L big-block. Notice that the smooth side of the belt is always against the smooth surface of the pulley.

How do you Un tension a Mercedes Benz belt?

At this point you can release the tension on the belt and slip it off of the alternator pulley. Place a 15mm socket over the bolt on the tensioner (red arrow) and turn the socket clockwise. This will un-tension the belt. If you are replacing the belt you will need to follow the steps below.

Can you replace the drive belt on a Mercedes Benz W124?

I recommend you buy two belts and always keep an extra one in the car. You don’t want to be stranded on the side of the road for the lack of a spare drive belt. Replacing the drive belt on the W124 is a very doable DIY; what it is not is as simple as doing it on and old Chevy.

When to replace a Mercedes Benz timing chain tensioner?

Failure to maintain constant tension can lead to the timing chain jumping a sprocket and then catastrophic engine failure. The first step in replacing the timing chain tensioner is to disconnect the battery.

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