Drive Belt Tensioner: Service and Repair

Remove/Install Poly-V-belt Tensioning Device

Shown On Engine 112:

1 Remove viscous fan (1)
2 Remove fan shroud (2).

NOTE: On Model 163 unscrew the screws at the bottom of the fan shroud.

3 Remove poly-V-belt (3)
4.1 Rotate the tensioning pulley (4a) in the anti�clockwise direction and lock

NOTE: Lock tensioning pulley with drift or pin (diameter 5 mm).

4.2 Rotate the tensioning device at the hexagon (4b) in the anti-clockwise direction and lock

NOTE: Lock tensioning device with a drift or pin (diameter 5 mm).

5 Unscrew the gas-operated spring (5) from the coolant pump

Shock absorber of belt tensioning device at the coolant pump housing - 35 N.m

6 Remove tensioning device (4)

Self-tapping screw of belt tensioner at the timing case cover
- Thread not pre-tapped - 35 N.m
- Thread pre-tapped - 25 N.m

7 Unscrew gas-operated spring (5) from the tensioning device (4)

Shock absorber of belt tensioning device - 25 N.m

8 Install in the reverse order