Lucerne V6-3.9L (2009)
4.
Momentarily release the steering wheel. Note the vehicle direction and amount of pull/lead or effort required to maintain a straight heading.
5.
Repeat this test on the same road with the vehicle traveling in the opposite direction in order to eliminate any crown and/or crosswind effects.
Lead/pull caused by non-level roads (crown) and crosswinds are considered normal.
6.
Drive the vehicle on a dry straight, smooth, level road at 64-97 km/h (40-60 mph). Accelerate at Wide Open Throttle (WOT). Record the vehicle
direction and amount of pull/lead or effort to maintain a straight heading.
Engine Mount Shim Repair Procedure
1.
Prior to elevating the vehicle on a hoist remove the forward torque strut bolt that retains the torque strut to the engine side bracket. Refer to Engine
Mount Strut Replacement in SI.
2.
Add a 5.0 mm (0.197 in) thick shim between the cradle and the right rear engine mount. The shim should be large enough to cover the entire base
of the mount to avoid stress on the mount. Refer to Engine Rear Mount Replacement in SI for instructions on how to remove the cradle from the
engine mount.
3.
Perform the engine and transmission mount balancing procedure. Refer to Engine and Transmission Mount Balancing - All Mounts in SI.
4.
Reinstall the forward torque strut bolt. Refer to Engine Mount Strut Replacement in SI.
5.
Perform the Vehicle Test Drive Evaluation/Analysis procedure.
Transmission Mount Bracket Modification Procedure
1.
Prior to elevating the vehicle on a hoist remove the forward torque strut bolt that retains the torque strut to the engine side bracket. Refer to Engine
Mount Strut Replacement in SI.
Notice:
Always use a wood block to avoid damaging the oil pan or transmission pan.
2.
Raise the vehicle on body hoist and support the powertrain using a jack stand. Refer to Lifting and Jacking the Vehicle in SI.
3.
Remove the two lower fasteners from the left hand transmission mount.
4.
Remove the three fasteners from the mount bracket to transmission and remove the bracket from the vehicle. Refer to Transmission Mount Bracket
Replacement - Left Side in SI.
5.
Using a die grinder, slot three mounting bolt holes DOWN approximately 2 mm (0.079 in). The hole should only be elongated; do NOT make the
slot any wider than the hole diameter.
6.
Re-install the transmission mount bracket locating it as far UP as possible prior to tightening.
Tighten
Tighten the bolts to 95 N.m (70 lb ft).
7.
Perform the engine and transmission mount balancing procedure. Refer to Engine and Transmission Mount Balancing - All Mounts in SI.
8.
Reinstall the forward torque strut bolt. Refer to Engine Mount Strut Replacement in SI.
9.
Perform the Vehicle Test Drive Evaluation/Analysis procedure. If the vehicle exhibits minor torque steer to the right, perform the Engine Mount
Shim Repair procedure
Warranty Information
For vehicles repaired under warranty, use the table.
