Diesel Data: Automotive Repair

Adjusting The Alternator Belt

ADJUSTING THE ALTERNATOR BELT

CAUTION: If the belt is too loose, it will cause noise or sudden wear.
If the belt is too tight, the engine coolant pump bearing or the alternator can get damaged.





1. Loosen the alternator nut "A" and the tension adjuster lock bolt "B".
2. Using the tension adjuster bolt, adjust the belt tension to the specification.
3. Tighten the adjuster lock bolt "B".
4. Tighten the alternator nut "A".
5. Check the tension or the deflection of belt, and readjust if necessary.
Tightening torque
Alternator support bolt and nut: 20 - 25 Nm (200 - 250 kg.cm, 14 - 18 ft. lbs.)
Alternator lock bolt B: 12 - 15 Nm (120 - 150 kg.cm, 9 - 11 ft. lbs.)
Alternator brace mounting bolt: 20 - 27 Nm (200 - 270 kg.cm, 15 - 20 ft. lbs.)