10 - 11 MERCEDES-BENZ M元50 3.0L 2987CC V6 DIESEL DOHC TURBOCHARGED.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. Local repair shops will charge between $280-$450. The average price to change the belt tensioner at the dealer ranges between $400-$650. The procedure is the same for many engines, including M112, M113, M273. This guide applies to the majority of Mercedes-Benz cars. It requires a few basic tools and approximately thirty minutes. Replacing the drive belt tensioner on the Mercedes-Benz engine is relatively easy. When this happens, you would normally hear noise coming from the front of the engine. The tensioner pulley bearing may also fail. The drive belt will come off the various pulleys, possibly causing damage. If not replaced on time, it can fail while the engine is running. Over time the tensioner pulley can start to crack. Access Battery - Learn where the battery is located.
Open the Hood - How to pop the hood and prop it open. Getting Started - Prepare for the repair. Start the engine and ensure the belt and tensioner are working properly. Battery Replacement: 2001-2007 Mercedes-Benz C230 Sport 2.5L V6 FlexFuel.Put pressure on the tensioner 17mm head to move the tensioner up and remove the locking pin.If the belt does not reach, make sure it is not sitting on top of one of the pulleys. Make sure it is routed on all the pulleys properly. Typical torque for the tensioner bolts ranges between 25Nm to 35 Nm. Torque the tensioner bolts to the recommended manufacturer specifications.Start threading the tensioner bolts by hand until a few threads have gone in.