DIESEL ROCKER ARM SHAFT CORRECT INSTALLATION PROCEDURE

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.

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.

3. Before installing bolts tlirough 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 lb. ft.).

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.