Valve Train - Ticking Noise/Backfiring

Number: 83-T-44

Section: VI

Date: MAY, 1983
Subject: VALVE TRAIN TICKING NOISE AND/OR BACKFIRING - ROCKER ARM PIVOT WEAR - 1978-83 5.7L V8 DIESEL

ROCKER ARM PIVOT:

TO: ALL CHEVROLET DEALERS


Some 1978-83 5.7L diesel engines may experience a valve train ticking noise and/or a backfiring condition. This condition may be caused by premature rocker arm pivot wear.

Original rocker arm pivots were sourced from two vendors. The vendor identification for both vendors can be found on the underside of the rocker arm pivot bridge (refer to illustration below).

The pivot assemblies that are exhibiting premature wear are those illustrated in Figure 2.

It is recommended that ONLY the pivots illustrated in Figure 1 be used when servicing an engine for the above mentioned condition.