C 20 3/4 Ton Pickup 2WD V8-379 6.2L DSL VIN J FI (1982)
Pre-combustion Chamber: Technical Service Bulletins
Cylinder Head - Prechamber Cracks
Number:
83-106
Section:
6A (VI)
Date:
Nov., 1983
Subject:
CYLINDER HEAD PRECHAMBER CRACKS
ON 6.2L DIESEL ENGINES
Model and Year:
1982-83 "C-K-P-G" TRUCKS
TO:
ALL CHEVROLET DEALERS
During the service of 6.2L diesel cylinder heads, the observance of hairline cracks may be noted in the prechamber area.
Cracks on the face of the prechamber start at the edge of the fire slot. From the edge, the cracks proceed toward the circular impression of the head
gasket bead.
These cracks are a form of stress relief and are completely harmless up to a length of 5 mm (3/16"). cracks longer than this are approaching the head
gasket sealing bead and should be replaced with the proper part number.
ACCEPTABLE AND NONACCEPTABLE CRACKS
The sketch below of a prechamber displays both acceptable and nonacceptable cracks.
