Dynasty L4-153 2.5L SOHC (1988)
Exhaust Pipe: All Technical Service Bulletins
Exhaust Flex Joint - Chirp/Clunk Noise
Models
1987 and 1988 C-E-G-H-J-K-L-P- & S-Body Vehicles With 2.2L and 2.5L Engines
Subject
Exhaust Seal Ring Service To Correct Chirp, Clunk, and/or Leak
Index
EXHAUST
Date
April 25, 1988
No.
11-01-88
P-1554 (C11-01)
SYMPTOM/CONDITION
^
Exhaust flex joint (seal ring) "Chirp" or "Clunk," which is most noticeable when shifting from neutral to drive or reverse.
^
Momentary exhaust leak during engine rotation under acceleration.
NOTE:
VEHICLES THAT HAVE AN EXHAUST SQUEAK ON ACCELERATION WILL NOT BE IMPROVED BY PIPE SIZING.
DIAGNOSIS
Road test vehicle to verify that noise/leak is coming from the exhaust seal ring.
PARTS REQUIRED
Order the following parts for the vehicle being repaired:
2
Shoulder Bolts
PN 5217003
2
Nuts
PN 6100499
2
Springs
PN 4301631
REPAIR PROCEDURE
NOTE:
ALL 1988 2.2L AND 2.5L NON-TURBO VEHICLES BUILT AFTER 11/01/87, HAVE HAD THIS PIPE SIZING PROCEDURE
DONE IN ASSEMBLY AND SHOULD NOT REQUIRE SERVICE IN THE FIELD.
ONCE THE SEAL RING IS SIZED TO THE PIPE IT CANNOT BE REPLACED.
1.
Remove clamp at the first slip joint and carefully separate exhaust system at that point.
NOTE:
USE EXTREME CARE TO AVOID EXHAUST PIPE DAMAGE. IF THE EXHAUST PIPE IS DAMAGED DURING REMOVAL,
REPLACEMENT WILL BE REQUIRED.
2.
Remove the two shoulder bolts holding exhaust flex joint to manifold.
3.
Inspect exhaust manifold seal area for burrs, nicks, and other imperfections in the mating surface of the manifold. Clean any imperfections with a
wire brush or emery paper.
4.
If needed, install a new seal ring on the pipe.
NOTE:
THE FOLLOWING OPERATION REQUIRES THE USE OF A MULTI-SEGMENT HEAD HYDRAULIC PIPE
EXPANDER. THE USE OF ANY OTHER TYPE OF EXPANDER MAY NOT UNIFORMLY EXPAND THE PIPE TO FIT
THE SEAL RING.
