GMC chevrolet camaro 2000 Service Manual page 800

Engine Engine Mechanical - 3.8L 6-33
Drive Belt Chirping Diagnosis
Step
Action Yes
No . .
Notice: Refer to Belt Dressing Notice in Cautions and Notices.
DEFINITION: The following items are indications of chirping:
• A
high pitched noise that is heard once per revolution of the drive belt or a pulley.
• Chirping may occur on cold damp startup conditions.and will subside once the vehicle reaches normaloperating
temperature.
1
Did you review the Symptoms - Drive Belt diagnostic information and Go to Symptoms
~
perform th.e necessary inspections?
Go to Step .2
· Drive Belt .·.
2
Verify that there is a chirping.noise.
Goto
Does the engine make the chirping 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 the chirping noise. still exist?
..
Engine)
Go tp. Step 4
4
Inspect for severe belt pilling exceeding 1/3 of the belt groove depth.
c
;
Does the belt grooves have pilling? Go to Step 5
Go to. Step 6
5
Clean the drive belt pulleys with a suitable wire brush.
Were the drive belt pulleys cleaned? Go toStep 15 Go toStep 6
6
Inspect for a misalignment of the pulleys.
Are any. of the pulleys misaligned? Go to Step 7 Go to Step 8
7
Replace and/or repair any misaligned pulleys.
Were the misaligned pulleys repaired and/or replaced? Go to Step 15
Goto Step 8
Inspect for bent and/or cracked brackets.
(
8
.,
Were there any bent and/or cracked brackets? GotoStep9 Go to Step 10
Replace any bent and/or cracked brackets. Refer to Drive Belt
)
9
Tensioner Replacement.
Were the bent and/or cracked brackets replaced? Go to Step 15 Go to Step 10
10
Inspect for improper, missing and/or loose fasteners.
Were there any improper, missing and/or loose fasteners? Go to Step 11 Go to Step 12
Replace any improper and/or missing fasteners.
11
Tighten any loose fasteners. Refer to Fastener Tightening
Specifications.
Did you complete the repair?
Go to Step 15
Go to Step 12
12
Inspect for a bent pulley.
Was a bent pulley found? Go to Step 13 Go to Step 14
13
Replace the bent pulley.
Was the bent pulley replaced? Go to Step 15 Go to Step 14
14
Replace the drive belt. Refer to Drive Belt Replacement.
Go to
Was the drive belt replaced? Go to Step 15 Diagnostic Aids
15
Run the engine in order to verify the repair.
Does the drive belt still chirp? Go to Step 3 System OK