Drive Belt Tensioner: Service and Repair

Auxiliaries belt/belt tensioner, replacement

Special tools:
999 7195 Holder 999 7195 Holder
999 7279 Wrench 999 7279 Wrench

Note! The illustrations in this service information are used for different model years and/or models. Some variation may occur. However, the essential information in the illustrations is always correct.

Removal

Removing the upper engine covers
Remove the upper engine covers by pulling them straight up.

Removing the cover over the servo pump

Remove:
- one end of the ground cable between the engine and body and the hose between the expansion tank and engine
- the 2 screws on the cover over the servo pump
- the cover.

Removing the servo oil line





Remove:
- the nut of the clamp
- the screw on the oil feed pipe.
Plug the openings and wipe up any spills.
Bend aside the servo oil line. Scrap the gasket.

Removing the auxiliaries belt





Caution! Relieve the load on the belt tensioner by turning it clockwise to max. 230 Nm and lock the tensioner with relevant tool.

Caution! Ensure that 230 Nm is not exceeded when the belt tensioner is relieved. The torque takes more than 20 seconds to carry out without risk of affecting the belt tensioner.

999 7195 Holder 999 7195 Holder




Lift off the auxiliaries belt.

Hint: Note the routing of the belt to facilitate reinstallation.

Removing the belt tensioner





Remove:
- the screw of the tensioning and damping element
- the center screw to the belt tensioner. 999 7279 Wrench 999 7279 Wrench
- the belt tensioner.

Installation

Note! For tightening torques, see Specifications, B8444S Tightening Torque.

Installing the belt tensioner





Install:
- the belt tensioner
- the center screw to the belt tensioner. 999 7279 Wrench 999 7279 Wrench Tighten according to: Tightening torque, B8444S Tightening Torque.
- the screw of the tensioning and damping element; tighten

Installing the auxiliaries belt




Install the auxiliaries belt.
Rotate the belt tensioner clockwise to max. 230 Nm and remove tool: 999 7195 Holder 999 7195 Holder.

Note! Make sure the belt is properly seated in the groove.

Installing the servo oil line





Install:
- a new gasket
- the servo oil line
- the nut on the clamp; tighten
- the screw on the oil feed pipe; tighten.
Wipe up any spills.

Installing the cover over the servo pump

Install:
- the cover over the servo pump.
- the 2 screws; tighten.
- the ground cable between the engine and body and the hose between the expansion tank and engine.

Installing the upper engine covers
Position the upper engine covers and press them into the retainers.