Engine - Valve Train Noise
88chevy21Number: 88-279-6A
Section: 6A
Date: JULY, 1988
Subject: VALVE TRAIN NOISE
Model and Year: 1988 CAVALIER, CORSICA, BERETTA WITH 2.0L (VIN 1) ENGINE
TO: ALL CHEVROLET DEALERS
Customer comments of "valve train noise" or "tappet noise" could be the result of rockers with insufficient thickness on the valve contact pad.
If the engine build date is from T0505xxx to T0512xxx, then the rocker arms should be checked. The engine build date is located on top-rear surface of cylinder case on the exhaust side of engine -- NO PARTS NEED TO BE REMOVED TO READ THE NUMBER. The rocker arms that have excessive valve lash and cannot be adjusted should be replaced with a new service part.
Engines that display valve train noise and are outside this engine build date group should be examined in other areas of the valve train for cause of the noise.
Use applicable labor operation code and labor time.