Drive Belt Squeal Diagnosis - GMC chevrolet camaro 2000 Service Manual

6-34 Engine Mechanical - 3.8L
Drive Belt Squeal Diagnosis
Diagnostic Aids
A loose or improper installation of a body component,
a suspension component, or other items on the
vehicle may cause the squeal noise.·
If the noise is intermittent, verify that the accessory
.drive components are not the cause, by varying their
loads makirig sure they are operating to their
maximum capacity. An overcharged A/C system, a
'power steering system restriction, or incorrect fluid, or
a failing generator are suggested items to inspect.
Test Description
The number(s) below refer to the step number(s) on
the diagnostic table.
2. The noise may not be engine related. This step is
to verify that the engine is making the noise. If
the engine is not making the noise do not proceed
further w.ith this table
3. The noise may be an internal engine noise.
Remove the drive belt and operate the engine for
a brief period, th.is will verify that the squeal
noise is the drive belt or an accessory drive
component. With the drive belt removed the water
pump may not operate and the engine may
overheat. Also DTCs may set when the engine is
operated with the drive belt removed.
4. This test is to verify that an accessory drive
component does not have a seized bearing. With
the drive belt removed test the bearings in the
accessory drive components for smooth operation.
Engine
Test the accessory drive components with the
engine operating by varying the load on the
components to verify that the components operate .
properly,
5. This test is to verify that the drive beltterisioner
operates properly. If the drive belt tensioner is
not operating properly, proper belt tension may not
be achieved to keep the drive belt from slipping
which could cause a belt squeal noise.
6. This test is to verify that the drive belt is not to
long, which would prevent the drive belt
tensioner from operating properly. Also if an
incorrect length drive belt were installed, it may
not be routed properly and may be turning
an accessory drive component in the wrong
direction.
7. Misalignment of the pulleys may be caused from
improper mounting of the accessory drive
component, incorrect installation of the accessory
drive component pulley, or the pulley is bent
inward or outward from a previous repair .. Tesl for
a misaligned pulley using a straight edge iri the
pulley grooves across two or three pulleys. If
a misaligned pulley is found refer to that accessory
.drive component for the proper installatio.n
procedure for that pulley.
8. This test is to. verify that the pulleys are the (
co.rrect diameter or width. Using a known. good
vehicle compare the pulley sizes. ·
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