Firebird V8-305 5.0L VIN E TBI (1989)
Valve Guide Seal: All Technical Service Bulletins
Exhaust System - Smoke On Startup
Bulletin Number:
91-6-55
Reference Number:
136007
Publish Date:
11/91
Subject:
TAILPIPE SMOKE ON STARTUP (INSTALL NEW VALVE STEM SEAL KIT)
Models
1987-91 FIREBIRD AND GRAND PRIX
Affected:
MODELS W/5.0 and 5.7L
This bulletin cancels and supersedes bulletin 88-6-91A issued 3/89 and 88-6-85 issued 12/88. Please discard these two bulletins.
CONDITION:
Some owners of the above vehicles may comment on a puff of blue or bluish white tailpipe smoke on startup.
CAUSE:
Oil leaking past valve stem seals and being deposited on exhaust valve(s).
CORRECTION:
A new valve stem seal kit (P/N 12511890) has been released to address this concern. The kit incorporates a new umbrella
seal with a "viton" insert for the exhaust valve stem.
Parts are currently available from GMSPO.
Use applicable Labor Operations and Times.
