Drive Belt: Adjustments

Retensioning The Belt
Retension the belt as described in the General Adjustment Notes section below. Before measuring the belt tension, start engine and let engine idle briefly.

Tension:
Cold engine: 15 to 23 scale increments
Engine at operating temperature: 20 to 28 scale increments

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.