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How to Fix a Belt Noise in a 1997 Isuzu Trooper

The 1997 Isuzu Trooper was available in three trim levels: S, LS and Limited. All three were equipped with a 3.2-liter V-6 engine that produced 190-horsepower and 195 foot-pounds of torque. The 1997 Isuzu Trooper engine utilizes three different belts to propel the belt driven engine parts. The tension on the belt is controlled by the swivel mounting bracket on the power steering pump. Adjusting the power steering pump will tighten the serpentine belt.

Instructions

Power Steering Belt Adjustment

1

Open the hood on the Trooper and set the hood prop. Position your body near the power steering pump, in the front of the engine compartment.

2

Loosen the power steering pump swivel mounting bolt on the bottom of the pump using a ratchet and socket. Loosen the power steering pump adjuster bolt on the adjuster plate. Push the power steering pump upward using a small pry bar between the pump housing and the engine block if needed. Tighten the adjuster bolt while maintaining pressure upward on the pump.

3

Tighten the adjuster bolt to 34 foot-pounds using a 1/2-inch-drive torque wrench and socket. Tighten the bottom pump swivel mounting bolt to 34 foot-pounds.

4

Step to the drivers side of the truck and start the engine. Press the gas pedal slightly to increase the engine rpm. If the belt still makes a noise, inspect the belt tensioner plate. If the adjuster bolt is at the limit of its adjustment and you still have a belt squeal, the belt needs to be replaced. If the belt noise still exists and you have room for more adjustment, tighten the belt by repeating steps 2 and 3, until the belt squeal goes away.

Alternator Belt Adjustment

5

Loosen the fixing bolt and the lock bolt on the alternator using a ratchet and socket.

6

Rotate the adjuster bolt in the side of the adjuster to add tension to the alternator belt. Tighten the fixing bolt to 16 foot-pounds and the lock bolt to 17 foot-pounds, using a 1/2-inch-drive torque wrench and socket.

7

Proceed to the drivers side of the Trooper and start the engine. If the alternator belt still produces a squealing noise and the adjuster is set at its maximum adjustment, the belt needs to be replaced. If the belt makes a noise and there is more room for adjustment, readjust the belt using steps 1 and 2.

Air Conditioning Compressor Belt Adjustment

8

Loosen the lock bolt on the tensioner assembly. Rotate the adjuster bolt to tighten the tension on the A/C compressor belt.

9

Tighten the lock bolt to 37 foot-pounds with a 1/2-inch-drive torque wrench and socket.

10

Proceed to the drivers side of the Trooper and start the engine. If the air conditioning belt makes a squealing noise, shut the engine off and readjust the belt tighter using steps 1 and 2. If the tensioner is set to its maximum outward position, the belt needs to be replaced.