Engine - Timing Gear Noise
Model Year 1983Bulletin No.. 83-236
File In Group 60
Number 53
Date Dec. 84
SUBJECT: 2.5L (VIN CODE R) ENGINE TIMING GEAR NOISE
MODELS AFFECTED: 1982-83 CENTURYS AND SKYLARKS WITH CRUISE CONTROL
There is a possibility of timing gear noise when the 2.5L engine is used in conjunction with cruise control on the 1982-83 Century and Skylark vehicles.
This noise is caused by the load applied to the camshaft by the vacuum pump.
FIGURE 1:
FIGURE 2:
To correct the condition remove the vacuum pump and install cover, Part Number 10022599, and gasket, Part Number 9776705, using the existing bolts and washers. A vacuum tank, Part Number 14080255, must be installed using nuts, Part Number 11503747. The vacuum tank is installed below the vapor canister as shown in Figure 2. Six feet of 1/4" vacuum hose, one foot of
1/8" vacuum hose and 1/4" - 1/8" reducer are required to connect the
canister. The canister should be connected as shown in Figure 1. Verify operation of cruise control unit.