C 20 3/4 Ton Pickup 2WD V8-379 6.2L DSL VIN C FI (1983)
Rocker Arm Assembly: Technical Service Bulletins
Engine - Rocker Arm Shaft Installation
Number:
83-I-12
Section:
VI
Date:
Nov. 1982
Subject:
ROCKER ARM SHAFT INSTALLATION - 1983 "C-K" 10-30 LIGHT DUTY MODELS WITH 6.2L DIESEL (RPO LH6 OR LL4)
TO:
ALL CHEVROLET DEALERS
Rocker arm shafts may break if installed improperly. Uneven torquing causes stress at bolt holes.
The proper method to install rocker shafts is as follows:
1.
Set engine balancer timing mark at TDC mark on engine.
FIGURE A - ROTATION OF ENGINE TO CLOSE VALVES
2.
Rotate engine 3-1/2" counter clockwise (measured on balancer) or to first lower water pump bolt (see Figure A). This procedure will position the
engine so that all valves are closed.
FIGURE B - SHAFT ASSEMBLY
3.
Before installing bolts through shaft be certain that ring around shaft is installed with "split" at bottom (see Figure B).
4.
Snug both bolts on each shaft.
5.
Torque the bolts evenly to 45 N-m (35 ft.lbs.).
