Tensioner for V-ribbed belt (Mercedes-Benz C-Class W202)

Removal

1. Remove the fan hydraulic clutch.

Please note: The union nut has a left-hand thread.

2. Remove the fan shroud.

3. Remove the V-ribbed belt.

4. Use a screwdriver to pry open the tension roller locking cap.

5. Unscrew the tension roller.

6. 2.0L engine: Remove the coolant pump belt pulley.

7. Unscrew the belt tensioner shock absorber.

8. Unhook the tension spring.

9. Remove the cone bolt from the spring tension lever, after first pressing the locking cap.

10. Remove the spring tension lever, making sure that the sealing ring and washer are intact.

Installation

1. Install the spring tensioner arm with the sealing ring and washer and tighten to 100 Nm.

Caution: Clean threads with wire brush before installation and coat with sealant (the threads need to be degreased).

2. Insert the locking cap.

3. Hang the tension spring.

4. Tighten the tensioner shock absorber at the top with a torque of 25 N·m and at the bottom with a torque of 20 N·m.

Attention! If you install a new shock absorber, be sure to remove the air from it first. To do this, move the piston rod back and forth several times in the installation position.

5. 2.0L engine: Tighten the coolant pump belt pulley to 10 Nm (allen bolt) or 15 Nm (torsion bolt).

6. Tighten the tension roller to 25 Nm (2.0L engine) or 30 Nm (engine 2.2/2.5 l). Insert the locking cap.

7. Install the ribbed V-belt.

8. Install the fan shroud.

9. Install the fan hydraulic clutch.