Isuzu Cars and Trucks 1981-1991

Belts

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TENSION CHECKING AND ADJUSTMENT
V-Belts

Check the drive belts every 15,000 miles or twelve months for evidence of wear such as cracking, fraying, and incorrect tension. Determine belt tension at a point halfway between the pulleys by pressing on the belt with moderate thumb pressure. If the distance between the pulleys (measured at the center of the pulley) is 330 and 19400mm (13 and 1916 in.), the belt should deflect 13mm ( 1 / 2 in.) at the halfway point of its longest straight run; 6mm ( 1 / 4 in.) if the distance is 178300mm (712 in.). If the defection is found to be too much or too little, loosen the mounting bolts and make the adjustments.

Before you attempt to adjust any of your engine's belts, you should take an old rag soaked in solvent and clean the mounting bolts of any road grime which has accumulated there. On some of the harder-to-reach bolts, an application of penetrating oil will make them easier to loosen. When you're adjusting belts, especially on 4 cylinder engines with air conditioning and power steering, it would be especially helpful to have a variety of socket extensions and universals to get to those hard-to-reach bolts.


NOTE
When adjusting the air pump belt, if you are using a pry bar, make sure that you pry against the cast iron end cover and not against the aluminum housing. Excessive force on the housing itself will damage it.



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Fig. V-belt routing 1981 and 1985 I-Mark with gasoline engines



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Fig. V-belt routing P-UP with G180Z and G200Z engines



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Fig. V-belt routing early model Impulse



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Fig. V-belt routing early model Trooper II

Serpentine Belts

After 1989, the V6 engines are equipped with a serpentine belt and automatic belt tensioner. The tension is maintained by a spring loaded pulley/tensioner. The indicator mark on the moveable portion of the tensioner must be within the limits of the slotted area on the stationary portion of the tensioner. Any reading outside the limits indicates either a defective belt or tensioner.

To remove the belt , install a 1 / 2 in. ratchet handle into the square slot in the tensioner and move far enough to slide the belt off the pulleys. Mark the belt routing for installation.



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Fig. Serpentine belt routing 2.8L V6 Trooper II



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Fig. Serpentine belt routing 3.1L V6 Rodeo



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Fig. View of a serpentine belt and proper serpentine belt alignment

 
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