Bonneville V6-3800 3.8L Supercharged (1992)
Drive Belt: All Technical Service Bulletins
Engine - Thump or Knock Noise At or Just Off Idle
Bulletin Number:
92-6-31A
Reference Number:
206002R
Publish Date:
9/92
Subject:
THUMP OR KNOCK NOISE AT OR JUST OFF IDLE (INSTALL NEW SINGLE BELT ACCESS DRIVE BELT)
Models
Affected:
1992 BONNEVILLE, GRAND AM AND TRANS SPORT MODELS WITH 3300/3800 ENGINE
THIS BULLETIN IS BEING REVISED TO CHANGE BELT PART NUMBERS AND PARTS AVAILABILITY DATES. THIS BULLETIN
CANCELS AND REPLACES BULLETIN 92-6- 31 ISSUED 3/92.
New S.B.A.D. belts were released for production October 1, 1991 and are now available for service on 1992 3300/3800 V6 engines. These new belts,
with smoother grooves, greatly reduce "belt pilling". Belt pilling is a condition in which particles of belt material forms small balls or "pills" in the belt
grooves. Some degree of pilling is normal, however, excessive pilling can cause a thump or knock noise when the pills pass over various pulleys. The
thump or knock noise could be misdiagnosed as an engine or accessory noise.
The following checklist will help diagnose and repair a belt pilling condition:
1.
Remove the belt and momentarily run the engine to confirm that the source of the noise has disappeared.
2a.
If the noise does not disappear, there are other factors that can cause a thump or knock noise. See Section 6 in the service manual for additional
diagnostic information.
2b.
If the noise does disappear; inspect the power steering pulley for proper alignment and repair as necessary.
3.
Inspect all pulleys for excess paint, debris or pills in the grooves - clean as necessary.
4.
Install a new belt from the listed service part numbers in the information section of this publication.
SERVICE PARTS INFORMATION:
MODEL
PART NUMBER
CODE
Bonneville And Trans Sport
25532180
SAT
Grand Am
24502762
SEV
NOTE:
Supercharged 3800 V6 engines were all produced with new smoother groove belts. The part numbers for these belts are:
Supercharged Drive
24501446
Alternator Drive
24501447
PARTS STATEMENT:
Parts are expected to be available on September 7, 1992. In case of limited inventory, parts will be placed on 400 control to waive VIP surcharges. Only
verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. However, the part will be shipped premium transportation
at dealer's expense and all other order types will be placed on backorder until the 400 control is removed.
