Exhaust - Leak at Exhaust Manifold to Exhaust Pipe

Number: 86-93

Section: 6F

Date: May 1986
Subject: EXHAUST LEAK - EXHAUST MANIFOLD
TO EXHAUST PIPE


MODEL AND YEAR: 1984-86 S/T MODELS EQUIPPED WITH
THE 2.8L V6 ENGINE
TO: ALL CHEVROLET DEALERS


Some 1984-86 S/T Trucks equipped with 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 1 - EXHAUST MANIFOLD ASSEMBLY:

A new exhaust manifold to exhaust pipe seal, P/N 25523937, and bolts, P/N 15547999, have been released to correct this condition (See Figure 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.).
Recommended Labor Time is as follows:

S Truck One Side - .4 Hrs.
Both Sides - .5 Hrs.
T Truck One Side - .6 Hr.
Both Sides - .6 Hrs. W/Skid Plate - .2 Hrs.