How much does it cost to change a Mercedes idler pulley?
Average cost to change Mercedes-Benz idler pulley yourself is under $50 USD. [toc] 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.
Do you need a Torx socket for a Mercedes idler pulley?
This is common on M112 and M113 engines from 1997 to 2007. Newer Mercedes-Benz idler pulleys (on M272 and M273 and newer models) require a Female Torx socket. Always verify by inspecting the bolt on the center of your idler pulley. Park your Mercedes-Benz in an area where you can work.
Can a bad idler pulley cause a belt to come off?
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. At the early stage indicating that the idler pulley is failing, you will only hear a squeaky noise coming from the front of the engine.
How can I remove the locking pin on my idler?
Use your 17mm socket and ratchet to move the tensioner upward to remove the locking pin. Slowly load the tensioner. These torque specs may vary between models.
What kind of socket do you need for an idler pulley?
Note that the older models of Mercedes-Benz engines require a Torx Bit Socket. This is common on M112 and M113 engines from 1997 to 2007. Newer Mercedes-Benz idler pulleys (on M272 and M273 and newer models) require a Female Torx socket.
What causes belt to slip on idler pulley?
Over time, as the pulley spins against the belt, both components will eventually start to wear. This may lead to visible scoring marks on the surface of the pulley, as a result of contact with the belt. Eventually the pulley and belt will wear to the point of reducing tension, which may lead to the belt slipping. 2. Belt squealing
Can a idler pulley be removed from an alternator?
To remove the drive belt, first release the tension to the belt. If your idler pulley attaches to the alternator, you will have to remove the bolt attaching the pulley to the alternator and push the entire alternator down to relieve the tension on the belt.
Can a car run without an idler pulley?
An engine without a belt can quickly run into issues such as overheating and stalling, as it’s the drive belt that allows the engine accessories to function. Idler pulleys are a common component found on the majority of road going vehicles that will eventually require replacement, especially in high mileage vehicles.
How do you remove an idler pulley from a car?
Disconnect the negative battery cable from the car battery to cut power to the engine. Set the cable aside where it cannot make contact with anything metal. Step 2: Remove the drive belt. To remove the drive belt, first release the tension to the belt.
Where is the idler pulley on a Mercedes?
Pull the hood release under the dashboard on the driver’s side. Remove the engine cover by lifting it. Locate the idler pulley at the front of the engine. Remove the serpentine belt. Use a 17mm socket and ratchet on the tensioner nut to unload the tensioner.
Over time, as the pulley spins against the belt, both components will eventually start to wear. This may lead to visible scoring marks on the surface of the pulley, as a result of contact with the belt. Eventually the pulley and belt will wear to the point of reducing tension, which may lead to the belt slipping. 2. Belt squealing
This is common on M112 and M113 engines from 1997 to 2007. Newer Mercedes-Benz idler pulleys (on M272 and M273 and newer models) require a Female Torx socket. Always verify by inspecting the bolt on the center of your idler pulley. Park your Mercedes-Benz in an area where you can work.