Drivetrain - Vibration/Knocking Noise In Reverse
File in Section: 6 - EngineBulletin No.: 53-60-03
Date: February, 1995
SUBJECT:
Vibration, Knocking - Tapping Noise when Vehicle is put into Reverse (Grind Torque Strut to Engine Mount Bolt)
MODELS:
1994-95 Buick Skylark
1994-95 Oldsmobile Achieva
1994-95 Pontiac Grand Am
with 2.3L Engine (VINs A, D, 3 - RPOs LG0, LD2, L40) and 3.1L Engine (VIN M - RPO L82) and 3T40 and 4T60-E Transaxles (RPOs MD9, M13)
CONDITION
Some owners may comment on a drivetrain vibration and knocking-tapping noise when the vehicle is put into reverse. The noise will originate from the right front of the vehicle.
CAUSE
The torque strut to engine mount bolt contacts the front suspension support on the vehicle and emits the vibration - knocking/tapping sound.
CORRECTION
Inspect the tapered end of the torque strut to engine mount bolt for marks indicating contact with the front suspension support.
Grind torque strut to engine mount bolt off flush with the nut welded to the front suspension support of the vehicle as follows:
1. Scribe the tapered end portion of the bolt so mark is flush with the nut welded to the vehicle front suspension support.
2. Remove torque strut to engine mount bolt from vehicle.
3. Grind the bolt off where scribe mark was made.
4. Install bolt back into vehicle and torque to specs.
5. Test vehicle for correction of condition.
WARRANTY INFORMATION
For vehicles repaired under warranty, use:
Labor Operation Labor Time
J1520 0.4 hr