OUTER TIE ROD INSPECTION PROCEDURE REVISED

Model and Year: 1990 LUMINA

TO: ALL CHEVROLET DEALERS

THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 90-29O-3B, DATED JULY 1990. THE GRAPHICS HAVE BEEN ELIMINATED. ALL COPIES OF 90-29O-3B SHOULD BE DISCARDED.

Some questions and comments about outer tie rod diagnosis have been received. Some outer tie rods are being unnecessarily replaced after a technician has detected some up and down motion when pulling down on the outer tie rod when the vehicle is on a hoist for other work.

Up and down movement of the outer tie rod relative to the knuckle does NOT indicate any defect in the tie rod or tie rod end. Due to normal manufacturing variance and tolerance stack-up, some outer tie rods may move up and down relatively easily, while others may not appear to move at all.

The outer tie rods on 1990 "W" cars are maintenance-free, and are designed to resist wear much longer than previous designs. The most likely reason for premature wear to occur is a damaged seal allowing contaminants to enter the joint area.

The recommended procedure for outer tie rod inspection is as follows:

1. With the vehicle on a frame-contact type hoist and the key on (steering column unlocked), inspect the outer tie rod seals for any visible signs of damage-pinholes, cuts, tears, etc. If any seal damage is detected, the outer tie rod should be replaced.

2. Observe the left side outer tie rod while an assistant pushes and pulls on the right side tire/wheel assembly to move the steering system from side to side. If lateral (side-to-side) motion of the outer tie rod relative to the knuckle is detected, the outer tie rod should be replaced.

3. Repeat this procedure for the right side outer tie rod, with the assistant pushing/ pulling the left side tire/wheel assembly. if lateral motion of the outer tie rod relative to the knuckle is detected, the outer tie rod should be replaced.

Follow applicable service manual procedure when replacing outer tie rod.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.