See Figures 1, 2, 3, 4 and 5
Inspect the belts for signs of glazing or cracking. A glazed belt will be perfectly smooth from slippage, while a good belt will have a slight texture of fabric visible. Cracks will usually start at the inner edge of the belt and run outward. All worn or damaged drive belts should be replaced immediately. It is best to replace all drive belts at one time, as a preventive maintenance measure, during this service operation.
See Figure 6
Drive belts should be properly adjusted at all times. Loose belts cause improper operation of the water pump, fan, and generator or alternator. A belt that is too tight places a severe strain on the water pump and generator or alternator bearings. Replace any belt that is glazed, worn, or stretched so that it cannot be tightened sufficiently. On vehicles with matched belts, replace both belts. New belts are to be adjusted to the tension of 140 lbs. Any belt that has been operating for a minimum of 10 minutes is considered a used belt. Used belts are to be adjusted to a tension of 110 lbs. After installing a new belt, run the engine for 10 minutes and reset the tension to used belt specifications.
Alternator (Generator) Belt
- Position a ruler perpendicular to the drive belt, and stationary in relation to the water pump. Test the tightness of the belt by pressing it firmly with your thumb. The deflection should not exceed 1 / 4 inch.
- If the deflection is in excess of 1 / 4 inch, loosen the alternator (generator) mounting bolts and the adjusting arm bolt.
- Move the alternator (generator) away from the engine to obtain correct belt tension. When using a prybar to obtain correct tension, be sure to apply pressure on the alternator (generator) front only. Positioning such a device against the rear end housing will damage the unit.
- When the belt feels adequately tight, tighten the adjusting arm bolt only. Retest the deflection of the belt. If tension is incorrect, loosen the adjusting bolts and make the appropriate corrections. Retighten the adjusting bolts and test again.
- When belt is properly tightened, secure the mounting bolts.
Power Steering Belt
- Perform the adjustment the same as the alternator.
- If the deflection is in excess of 1 / 4 inch, loosen the adjusting and mounting bolts on the front face of the pump cover plate (hub side) and the one nut at the rear.
- On six-cylinder engines, fix a 9 / 16 inch open-end wrench on the projecting 1 / 2 inch boss and pry upward to correct the tension. To adjust the belt on V8 engines, loosen the mounting bolt in the adjusting slot and loosen the nut directly above the slot. Place a suitable prybar between the cast boss on the mounting bracket and the cast boss on the pump cover plate, and pry upward to correct tension. Do not pry against the pump reservoir as it can be deformed and cause a leak.
- Tighten the adjusting bolts and test the deflection of the belt. If the deflection is not in excess of 1 / 4 inch, secure the mounting bolts.