| Subject: | Revised Harmonic Balancer |
| Models: | 2002 Chevrolet and GMC S/T Utility Models (TrailBlazer, Envoy) |
| with 4.2L Engine (VIN S -- RPO LL8) |
| Built After VIN Breakpoint 22358862 |
A new second design Harmonic Balancer is being used on the 4.2L engine.
The new second design may be used to replace the previous first design.
All first design balancers should be removed using the J 44226
removal tool. The second design balancer should be removed with a standard
three jaw puller. Refer to the Engine Mechanical sub-section of the appropriate
Service Manual for complete removal and installation procedures.
The following illustration shows the first and second design parts.
