Sunfire L4-2.2L VIN 4 (1996)
Technical Service Bulletin # 87-61-21A
Date: 980401
Engine - Clattering Noise At Idle
File In Section: 6 - Engine
Bulletin No.: 87-61-21A
Date: April, 1998
Subject:
Timing Chain Noise Conditions (Replace Timing Chain)
Models:
1993-96 Buick Century
1992-97 Chevrolet Beretta, Cavalier, Corsica
1993-96 Oldsmobile Cutlass Ciera
1995-97 Pontiac Sunfire
1994-97 Chevrolet and GMC S Models
with 2.2L Engine (VIN 4 - RPO LN2)
This bulletin is being revised to correct Parts Information. Please discard Corporate Bulletin 87-61-21 (Section 6 - Engine).
Condition
Some of the above noted vehicles may exhibit a clattering noise at idle speed originating from the timing chain and front cover area. Chain wear in
excess of the maximum travel of the timing chain tensioner may create noise that may be objectionable to some customers.
Cause
Lack of regular maintenance, as referenced in the Owner's Manual and the resultant lack of lubrication and buildup of deposits inside the engine may
accelerate wear of the timing chain. In addition, there is a small lubrication hole in the front oil passage plug that could become blocked with debris if
proper engine maintenance is not followed.
Correction
If the owner of the vehicle indicates a noise concern, inspect the timing chain and tension In addition, confirm oil flow from the front oil passage plug
and replace the timing chain, timing chain tensioner, and both the camshaft and the crankshaft sprocket if necessary to correct the noise.
Service Procedure
1.
Using an Engine Ear J 39565 or an engine stethoscope listen to the area around the engine front cover and timing chain. It may be helpful to
compare any noises with a vehicle that is known to have good or new timing chain and tensioner components. Timing chain noise is most often
noted as a rattle or tick at idle speed that goes away at higher RPM. If the owner has a concern with engine noise and it does not appear to be
related to the timing chain, review any service bulletins related to engine noise and Service Manual diagnostics related to engine noise conditions.
2.
If timing chain noise is greater than normal, remove the engine front cover using procedures outlined in Section 6A2 or the Engine Section of the
appropriate Service Manual.
