Ignition - Installation of Timing Indicator

89Chevy18

Number: 89-143-6A
Section: 6A
Date: April, 1989
Subject: INSTALLATION OF TIMING INDICATOR/SET SCREW ON PARTIAL ENGINE ASSEMBLIES


Model and Year: 1985-89 S, T, M TRUCK WITH 2.5L (VIN CODE E) ENGINE

Figure 1:

TO: ALL CHEVROLET DEALERS

When completing the assembly of a partial engine, please be aware of the following:

1. 1985 and 1986 2.5L truck engines - The side-mounted timing indicator and plate assembly with attaching studs, as shown in Figure 1, should simply be transferred to the new partial engine.

Figure 2:

2. 1987 through 1989 2.5L truck engines - The set screw, as shown in Figure 2, needs to be removed form the new partial engine assembly. Apply Loctite (R) 242 or equivalent to the set screw and reinsert into the the block. The set screw should be seated flush to the boss surface. This step is required for two reasons:

A. The set screw is loosely threaded into the partial engine block as shipped from GMSPO and

B. The threaded hole breaks out into the coolant jacket and requires application of a sealant to the set screw to prevent a coolant leak.

This step must also precede installation of the air conditioning compressor support, as shown in Figure 2, if so equipped.