Drive Belt Tensioner: Service and Repair

Procedure
1. Remove auxiliaries belt:
- Use a jointed socket wrench on the tensioner to slacken belt.
Early versions is 3/8 inch
The latest version is 3/4 inch.

- Remove belt.





2. Tensioner replacement:
- Undo two tensioner screws and remove tensioner.
- Install new tensioner.
Tighten to 20 Nm (14.8 ft lb).

NOTE: If the replacement was due to noise, it may be sufficient to lubricate the tensioner to stop the noise.

- Lubricating the tensioner
- Remove the center screw and disassemble according to the illustration.
Lubricate with grease part No. 1 161 246-2 (50 gr. package) or 1 161 247-0 (500 gr. package), or equivalent, where indicated by the arrows.
- Reassemble and torque the center screw to 20 Nm (14.8 ft lb).





3. Install auxiliaries belt
- Place belt around crankshaft.
- Place belt around A/C-compressor, idler pulley, generator, and servo pump.
- Tension tensioner and put on belt.

NOTE: The dotted line shows the route of the belt on cars without A/C.

- Carry out function test.