Drive Belt Whine Diagnosis - GMC chevrolet camaro 2000 Service Manual

6-36 Engine Mechanical - 3;8L
Drive Belt Whine Diagnosis
Diagnostic Aids
The drive belt will not cause the whine noise.
'
If the whine noise is intermittent, verify the accessory
drive components are not the cause, by varying
their loads making 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 nurriber(s) on
the diagnostic table.
3. This test is to verify that the noise is being caused
by the drive belt or the accessory drive
components. With the drive belt removed the
Engine
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. The inspection should include checking the drive
belt tensioner and the drive belt idler pulley
bearings. The drive belt may have to be installed
and the accessory drive components operated
separately by varying their loads. Refer to
the suspected accessory drive component for the
proper inspection and replacement procedure.
Drive Belt Whine Diagnosis
Step Action Yes No
Notice: Refer to Belt Dressing Notice in Cautions and Notices.
DEFINITION: A high pitched continuous noise that may be caused by an accessory drive component failed bearing.
1
Did you review the Symptoms - Drive Belt diagnostic information and Go to. Symptoms -
perform the necessary inspections?
Go to Step2 Drive Belt
2
Verify that there is a\rvhine noise.
Goto
Does the engine make the whine noise? Go to Step 3 Diagnostic Aids
1 . Remove the drive belt.
Go to Engine Noise
3 2. Operate the engine for no longer than 30 to 40 seconds.
Diagnosis (Base
Does tt,e whine noise still exist? Engine) Go to Step4
4
Inspect for a failed accessory drive component bearing.
Go to
Did you find and repair the condition?.
Go to Step 5 Diagnostic Aids
5
Run the engine in order to verify the repair.
Does the drive belt still whine?
Go to Step 3 System OK
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