DeVille V8-273 4.5L (1989)
Exhaust Manifold: All Technical Service Bulletins
Exhaust Pipe - Leak at the Mounting Flange
Bulletin No.
T-90-22
File in Group
6A
Number
110
Corp. Ref. NO.
916602
Date
Nov. 1989
Figure 1 - Counterbored Shoulder
SUBJECT:
EXHAUST MANIFOLD FLANGE LEAKS
MODELS AFFECTED: 1989-1990 DE VILLES AND FLEETWOODS
Some 1989 and early production 1990 DeVille and Fleetwood models may experience a slight exhaust leak at the exhaust pipe mounting flange of the
right-hand (rear side) exhaust manifold. Some exhaust manifolds may have been produced without the counterbored shoulder shown in Figure 1. The
purpose of this shoulder is to position the metal sleeve, thus keeping the exhaust pipe seal aligned with the manifold.
To repair this condition a second design one-piece exhaust pipe seal has been released which captures the sleeve and seal together. The one-piece
exhaust seal is available by ordering P/N 3523071 and supersedes the previous two-piece design. Parts are currently available from GMSPO.
WARRANTY INFORMATION
VEHICLE SERIES
Operation
Operation Description
Number
C
D
E
J
K
V
Seal, Front Exhaust Pipe - Replace
L2090
.3
Part Group:
3.611
Policy:
E
