D 150 Pickup V6-239 3.9L (1992)
Tires: Customer Interest
Wheels/Tires - Vibration At Highway Speeds
NO.: 22-01-91 Rev. A
GROUP:
Wheels
DATE:
Dec. 30, 1991
SUBJECT:
Dual Wheel Vibration
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 22-01-91 WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL
REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS**.
NOTE:
THIS BULLETIN APPLIES TO 350 SERIES AD MODELS WITH DUAL REAR WHEELS ONLY.
MODELS:
1989-**1992** (AD) RAM PICKUP/RAM CAB & CHASSIS POWER RAM CAB & CHASSIS
SYMPTOM/CONDITION:
A customer complaint of a wheel and tire vibration, at highway speeds, on smooth road surfaces.
DIAGNOSIS:
This condition may be caused by the dual rear wheels being off center on the wheel studs. A properly centered wheel will have a balanced amount of
space for each lug nut flange to the wheel center hole; an off center condition will show a variable amount of space. Perform a visual inspection and road
test vehicle to verify condition.
PARTS REQUIRED:
2
90~ Cone Nuts
1273556
REPAIR PROCEDURE:
This repair involves dual wheel centering procedure.
1.
Raise the vehicle so that the rear tire(s) are off the ground. Do not remove the wheel(s) from the vehicle.
2.
Loosen all lug nuts. Remove two (2) of the flange nuts 180~ apart (do not discard). Use the positions with the largest flare surface for cone nut
contact.
3.
Replace the two (2) flange nuts with the 90~ cone nuts, PN 1273556, and torque to 68 N-m (50 ft.lbs.).
4.
Some loosening and tightening of the cone nuts and repositioning of the wheel might be necessary to obtain a centered wheel.
5.
When centered, tighten the six (6) flange nuts and torque to 68 N-m (50 ft.lbs.). Replace the two (2) cone nuts with the flange nuts that were
previously removed and torque to 68 N-m (50 ft.lbs.).
