Skylark L4-151 2.5L VIN R TBI (1982)
Exhaust Pipe/Muffler Hanger: All Technical Service Bulletins
Exhaust System - Loud Booming Noise at 1500 RPM
Bulletin
84-6F-2
Date
May '84
Ref. No.
84-222-6
SUBJECT:
1500 RPM BOOM
MODELS AFFECTED:
1982-84 CENTURY AND SKYLARK VEHICLES
WITH 2.5L (VIN CODE R) ENGINE (INCLUDING WAGONS)
Condition
Some 1982-1984 Century and Skylark vehicles equipped with the 2.5L engine may exhibit a loud booming noise at 1500 rpm.
Cause
This condition may be caused by the catalytic converter hanger being preloaded.
Correction
To correct this condition the following procedures should be followed:
1.
Remove the load from the catalytic converter exhaust hanger.
a.
Loosen the converter and manifold flange joint bolts.
b.
Break the converter joint loose.
c.
Retighten the bolts to 20-40 N-m (15-30 ft.lbs) while holding the converter up against the heat shield.
d.
Make sure the distance between the upper and lower converter hanger rivets is less than 62 mm.
CRADLE DAMPENER ASSEMBLY
2.
Install a newly released additional cradle dampener assembly (See Illustration).
PART NUMBER
DESCRIPTION
22527158
Dampener Assembly
10021800
Bolt
Do not remove the existing dampener.
