B2300 SE Regular Cab 2WD L4-2.3L VIN D (2001)
Drive Belt: Component Tests and General Diagnostics
Drive Belt-Misalignment
Drive Belt-Misalignment
CAUTION: Incorrect drive belt installation will cause excessive drive belt wear and may cause the drive belt to come off the drive pulleys.
NOTE: Original equipment drive belts are made of a special cord construction and are subjected to special testing before they are approved for use.
Replacement drive belts, other than O.E.M., may track differently or improperly. If a replacement drive belt tracks improperly, the drive belt should be
replaced with an O.E.M. drive belt to avoid performance failure or loss of drive belt during cold operation.
With the engine running, check drive belt tracking (the position of the drive belt on one of the grooveless pulleys, idlers or drive belt tensioner. If the
edge of the drive belt rides beyond the edge of the pulley, noise and premature wear may result). If a drive belt tracking condition exists, visually
check the drive belt tensioner for damage, especially the mounting pad surface. If the drive belt tensioner is not installed correctly with the locating
pins in the locating holes, the mounting surface pad will be out of position. This will result in abnormal drive belt tension and chirp and squeal noises.
If the above procedures do not correct the drive belt noise, try replacing the drive belt with a known good original equipment drive belt. However, the
drive belt noise may return (with mileage) if one of the above conditions still exists uncorrected.
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With engine running, visually observe the grooves in the pulleys (not the pulley flanges) for excessive wobble. Install new components as required.
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Check all accessories, mounting brackets and drive belt tensioner, for any interference that would prevent the component from mounting properly.
Correct any interference condition and recheck belt tracking.
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Tighten all accessories, mounting brackets and drive belt tensioner retaining hardware to specification. Recheck drive belt tracking.
Belt Tensioner
Belt Tensioner
The automatic drive belt tensioner can be checked as follows:
1. With the engine running, observe the drive belt tensioner movement. The drive belt tensioner should move (respond) when the A/C clutch cycles
or when the engine is accelerated rapidly. If the drive belt tensioner movement is constant without A/C clutch cycling or acceleration, a pulley or
shaft is probably bent or a pulley is out of round. In rare cases, excessive drive belt rideout (uneven depth of grooves in drive belt) can cause
excessive drive belt tensioner movement. This condition can be checked by replacing the suspect drive belt with a known good original equipment
drive belt and repeating the observation.
Engine Accessory Drive Test
Engine Accessory Drive Test
To carry out this test, proceed as follows:
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Remove the accessory drive belts.
WARNING: BLOCK THE FRONT AND REAR WHEELS, AND APPLY THE PARKING BRAKE AND THE SERVICE BRAKE, OR
INJURY TO PERSONNEL CAN RESULT.
CAUTION: Limit engine running time to one minute or less with belts removed or serious engine damage will result.
NOTE: A serpentine drive belt decreases the usefulness of this test. In these cases, use a Vibration Analyzer (VA), to pinpoint accessory
vibrations. An electronic listening device, such as an EngineEAR, will also help to identify noises from specific accessories.
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Increase the engine rpm to where the concern occurs.
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If the vibration/noise is duplicated when carrying out this test, the belts and accessories are not sources.
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If the vibration/noise was not duplicated when carrying out this test, install each accessory belt, one at a time, to locate the source.
