Drive Belt

Fitting A New Belt
When fitting a new belt, be sure to observe the correct assembly sequence in order to avoid any loss of belt tension during vehicle operation.

1. Fit new belt. Adjust tension by inserting or removing shims as required. Shims are available for belt tensioning in thicknesses of 0.5 mm and 0.7 mm The 0.7 mm shim is identified by a 2 mm dia. drill hole.
2. Before measuring the belt tension, start engine once more and run engine at idle briefly.

Tension: Cold engine: 23 to 35 scale increments

3. Run engine at idle for approx. 15 minutes or test drive vehicle for approx. 10 miles. Check tension again. Specification: 28 to 40 scale increments Retension if required. Test requirement: Engine at operating temperature

General Adjustment Notes





Fan wheel and alternator have separate drives.

Adjusting the V-belts
1. Use polygon wrench (999 571 052 02) to lock shaft and undo hexagon head nut. Remove shims and pulley half.
2. If belt tension is below specification, remove one shim from between pulley halves and refit in front of pulley half. Tighten hexagon head nut to 50 ± 5 Nm.
3. Three additional M 6 screws have to be undone for V-belt and fan wheel.
4. Use only V-belts that have been approved by the manufacturer.

NOTE: Rotate engine only at lower belt pulley or by operating the starter. After completing all operations, check to make sure that hexagon head nut has been tightened sufficiently on alternator shaft.