Toronado V6-231 3.8L (1986)
Axle Shaft: All Technical Service Bulletins
Engine/Transaxle - Slight Torque Steer On Acceleration
SUBJECT:
SLIGHT TORQUE STEER ON ACCELERATION
MODELS/YEARS:
1986-87 TORONADO MODELS
NUMBER:
87-T-56A
CORP. REF. NO: 703202R
DATE:
January 1989
SECTION:
3
This bulletin supersedes Dealer Technical Bulletin 87-T-56, dated 11/20/87, which should be discarded.
This bulletin has been revised to include new shim part number not included in the previous bulletin.
A condition of slight torque steer to the left, during acceleration, may be experienced on some 1986-87 Toronados. This condition may be caused by the
engine/transaxle assembly being misaligned in the cradle, resulting in improper drive axle operating angles.
Torque steer should not be confused with radial tire pull or lead. Review the radial tire lead/pull and torque steer diagnosis in Section 3 of the Chassis
Service Manual.
DEFINITIONS
Lead or Pull:
Vehicle movement to the left or right, at a constant speed, from a straight path on a level road with hands off the steering wheel.
Torque Steer:
Vehicle and steering wheel movement to the left or right (from driver's seat position) on acceleration.
PRELIMINARY INSPECTIONS
1.
Inspect cradle and suspension components for damage or misalignment.
2.
Inspect front brakes for binding calipers or sticking caliper pistons.
3.
Verify that front end alignment, tire inflation, and trim height are within specifications.
NOTICE:
Alignment equipment must be within calibration specifications. Do not exceed one (1) degree cross camber.
4.
Inspect drive axles for damage and/or binding.
REPAIR PROCEDURE
1.
Change the front tires from side to side and road test vehicle. If the condition is corrected or the vehicle now leads to the opposite direction, the
tires should be considered as the cause and replaced, if necessary. If no change is noted, proceed with Steps 2 thru 6.
2.
Loosen the engine/transaxle to cradle mounts and allow the assembly to settle.
3.
Disconnect the exhaust pipe from the exhaust manifold.
4.
Remove the left hand transaxle mount with bracket. Replace the mount with Part Number 17989560, reusing the bracket. Parts are currently
available from GMSPO.
NOTICE:
Make sure the hood is raised to avoid damage during engine jacking.
5.
Shift the right front engine mount to the extreme left side (driver's side) of the frame slots.
NOTICE:
Do not attempt to retrofit 1986 engine mount with 1987 engine Hydromount.