Symptom/Condition 3

A clunk noise while shifting into reverse can be caused by relative movement between the metal can which the front engine mount isolator is molded around and the square metal can which is welded to the bracket which the isolator can is pressed into (Refer to Figure 4).

To diagnose the front mount, fully apply the parking brake and service brakes. Watch and listen to the front mount while an assistant shifts the transmission into reverse and slowly increases the throttle opening (brake torque). It will be visually apparent if the inner isolator can moves relative to the outer can causing an audible clunk noise during this maneuver. If the vehicle exhibits this condition, perform repair procedure 2.