Do you need to replace the Mercedes belt tensioner?
In this guide, you will find step-by-step instructions on how to replace the Mercedes-Benz belt tensioner. While it is not required to replace the drive belt, it makes sense to replace it simultaneously as the tensioner. It is ok to reuse the old belt if it does not show wear, cracking, degradation, or drying.
What should I do if my Mercedes tensioner starts to crack?
Put pressure on the tensioner 17mm head to move the tensioner up and remove the locking pin. Start the engine and ensure the belt and tensioner are working properly. Over time the tensioner pulley can start to crack.
What happens if you don’t replace your tensioner?
Over time the tensioner pulley can start to crack. If not replaced on time, it can fail while the engine is running. The drive belt will come off the various pulleys, possibly causing damage. The tensioner pulley bearing may also fail. When this happens, you would normally hear noise coming from the front of the engine.
In this guide, you will find step-by-step instructions on how to replace the Mercedes-Benz belt tensioner. While it is not required to replace the drive belt, it makes sense to replace it simultaneously as the tensioner. It is ok to reuse the old belt if it does not show wear, cracking, degradation, or drying.
Put pressure on the tensioner 17mm head to move the tensioner up and remove the locking pin. Start the engine and ensure the belt and tensioner are working properly. Over time the tensioner pulley can start to crack.
Over time the tensioner pulley can start to crack. If not replaced on time, it can fail while the engine is running. The drive belt will come off the various pulleys, possibly causing damage. The tensioner pulley bearing may also fail. When this happens, you would normally hear noise coming from the front of the engine.
What should the torque be on a Mercedes tensioner?
Torque the tensioner bolts to the recommended manufacturer specifications. Typical torque for the tensioner bolts ranges between 25Nm to 35 Nm. Check with your dealer. Install the drive belt. Make sure it is routed on all the pulleys properly. If the belt does not reach, make sure it is not sitting on top of one of the pulleys.
How do you remove a tensioner from a Mercedes?
Remove the top Torx bolt using an E12 Torx socket and a 2″ extension. Remove the lower Torx bolt. Some models also have a shock attached to the tensioner. Remove the upper bolt from the shock to disconnect it from the engine block.
Torque the tensioner bolts to the recommended manufacturer specifications. Typical torque for the tensioner bolts ranges between 25Nm to 35 Nm. Check with your dealer. Install the drive belt. Make sure it is routed on all the pulleys properly. If the belt does not reach, make sure it is not sitting on top of one of the pulleys.
How much does it cost to change a Mercedes belt tensioner?
The average price to change the belt tensioner at the dealer ranges between $400-$650. Local repair shops will charge between $280-$450. The DIY cost to change the Mercedes-Benz drive belt tensioner ranges between $50-$120, even if you have to buy the tools needed for this job and a new serpentine belt.
Do you need to replace the drive belt on a Mercedes?
While it is not required to replace the drive belt, it makes sense to replace it simultaneously as the tensioner. It is ok to reuse the old belt if it does not show wear, cracking, degradation, or drying. Park, your Mercedes-Benz, set the parking brakes, and allow the engine to cool down.
How do you remove a serpentine belt from a Mercedes?
Using your 17mm socket, turn the tensioner counterclockwise to remove tension from the belt. Insert your punch or rivet into the tensioner. This will lock the tensioner in place, and keep tension off of the belt. Un-route the belt from the engine pulleys, and out of the engine. Figure 12.
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 to replace a Mercedes 190E drive belt?
Place the Mercedes-Benz tool # 103-0040 (yellow arrow) in between the grooves on the housing and slowly rotate the fan until the tool engages the hole in the back of the pulley. Insert lower right shows what it looks like with the pulley off.
How do you replace a Mercedes 190E drive belt?
With the fan out of the way, locate and loosen a half turn the 19mm fixing bolt on the belt tensioner. Locate the 13mm adjusting nut between the water and power steering pumps and loosen it. With the nut loosened you can pull up on the belt and remove it from the pulleys. Installation is the reverse of removal.
Where can I get a belt tensioner replacement?
With your vehicle info handy, give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need. Followup from the Pelican Staff: Always start in the back with the wheel farthest from master cylinder.
How to replace water pump in Mercedes 190E?
Insert Mercedes-Benz tool # 103-0040 behind the fan pulley, and seat it between the two groves on the housing. Gently spin the fan until the tool slips into the corresponding hole on the pulley. Remove the 8mm Hex bolt and fan from the engine compartment.
Can a drive belt be replaced with a radiator?
That being said, you certainly can replace your belt with the radiator in, but I recommend you put a piece of cardboard over it to protect it while working. Begin by removing the thermostat overflow hose from its clip on the top of the engine, and remove the distributor cover plate.
What happens if you change the idler pulley on a Mercedes Benz?
Changing the idler pulley on a Mercedes-Benz is a relatively easy job for most DIYers and required less than two hours. A bad idler pulley can cause the serpentine belt to come off. Once the belt comes off, you will experience multiple problems if you continue to operate the vehicle. Power steering is difficult to turn.
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 to change the coolant in a Mercedes Benz?
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. You can also lock the tensioner into the open position if you need both hands to install the new belt.
Why does my Mercedes Benz belt make a squealing noise?
The V-belt tensioner provides a constant tension on the belt which is needed to run all of the engine accessories. Over time the tensioner can fail to maintain the proper tension and the belt will start to slip. If this happens it will usually make a squealing noise.
How long does it take to replace belt tensioner on Mercedes Benz W203?
Replacing the belt tensioner on your Mercedes-Benz W203 is a relatively easy job. You should be able to do it in an hour and is a great starter project if you are just beginning to DIY or “Do It Yourself” on your car. Let the car cool so you don’t have to work around a hot engine.
How do you remove a tensioner on a Mercedes Benz?
To remove the tensioner you will need to lock it into the open position. Turn the tensioner wheel counter-clockwise and insert a retaining pin between the rotating part and the tensioner base.
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. You can also lock the tensioner into the open position if you need both hands to install the new belt.
The V-belt tensioner provides a constant tension on the belt which is needed to run all of the engine accessories. Over time the tensioner can fail to maintain the proper tension and the belt will start to slip. If this happens it will usually make a squealing noise.