TrailBlazer 4WD L6-4.2L VIN S (2002)
Piston: Technical Service Bulletins
Engine - Piston Application/Usage
Bulletin No.: 03-06-01-028
Date: November 19, 2003
INFORMATION
Subject:
Information on Correct Piston Usage
Models:
2002-2003 Chevrolet Trailblazer
2002-2003 GMC Envoy
2002-2003 Oldsmobile Bravada
with 4.2L Inline 6 Engine (VINS - RPO LL8)
Should any of the above vehicles require a piston for any reason, the following replacement part number should be used. 88984235 - Standard size piston
with piston pin and rings.
Although this replacement piston may not appear to match the piston that is removed, it has been designed to replace all 2002 and 2003 model year
engine pistons. This change was implemented into production engines beginning with EUN (engine unit number): V301290522. The EUN may be found
on the left side of the engine under the A/C compressor bracket or at the rear on the back of the cam cover.
Important:
When replacing pistons, all six pistons must be replaced if the EUN is below the above number or if the EUN cannot be located. If pistons of
different types were installed in the engine, excessive engine vibration would result.
Piston rings for these engines will not be released and will require a piston change if a piston ring change is indicated.
Parts Information
Parts are expected to be available from GMSPO on December 1, 2003.
Disclaimer
