Exhaust - Manifold to Exhaust Pipe Attaching Leak
NUMBER: 86-B-82GROUP: 6F - Intake & Exhaust
DATE: May, 1986
SUBJECT: EXHAUST LEAK
MODELS: 1984-86 S/T MODELS EQUIPPED WITH THE 2.8L V6 ENGINE
Some 1984-86 S/T Trucks equipped with the 2.8L V6 engine may exhibit an exhaust leak at the exhaust manifold to exhaust pipe attaching locations. This condition usually occurs on a start up with a cold engine, however, after the engine warms up, the leak stops. The condition most generally occurs at the right side manifold to exhaust pipe connection.
Figure No. 1 - New exhaust pipe seal and bolts:
A new exhaust manifold to exhaust pipe seal, P/N 25523937, and bolts, P/N 15547999, has been released to correct this condition (See figure no. 1). The new bolts can only be used on the right side, while the new seal can be used on both sides. The torque for the bolts is 17 - 23 N-m. (23 - 30 ft.lbs.). The procedure for replacing the seal and bolts can be found in Section 6F of the S15 Light Duty Service Manual.
Recommended labor time is as follows:
S Truck One Side - .4 hour T Truck One Side - .4 hour
Both Sides - .5 hour Both Sides - .6 hour