Alignment - Vehicle Drifts to the Right Side

Classification:
WT92-002

Section:
WHEEL & TIRE

Reference:
TECHNICAL BULLETIN NTB92-122

Models:
1990 300 ZX & TURBO

Date:
December 17, 1992

1990 300ZX DRIFTS TO ONE SIDE

This bulletin supersedes Bulletin WT90-002 (TS90-078), dated September 20, 1990, giving additional Parts Information & including the Turbo model

APPLIED MODELS:
1990 300ZX (Z32) Non-Turbo & Turbo

SERVICE INFORMATION:

Some 1990 300ZX vehicles may drift slightly to the right and require slight, but steady, steering correction to maintain a straight line - with or without brakes applied. Use the following procedure to inspect and repair vehicles with this complaint.

INSPECTION/REPAIR PROCEDURE:

1. Ensure that tires are properly inflated: Front, 33 PSI (cold); Rear, 36 PSI (cold).

2. Drive vehicle on an uncrowned road, if possible, to determine direction and severity of pullling. If uncrowned road is not available, try to drive on both sides of the crown to isolate vehicle effects from road effects.

3. If it is determined that the vehicle consistently drifts to the same side, regardless of the road crown, perform a 4-Wheel Alignment utilizing specifications found on the back outer cover of the 1990 300ZX Service Manual. Repair any non-conforming conditions.

4. If the vehicle meets specifications or has been adjusted to specifications, and the vehicle still drifts, replace both front tires with new ones (see PARTS INFORMATION section of this bulletin).

a. Ensure that the wheels are mounted on the correct side of the vehicle and that the directional arrows on the sidewalls of the tires point in the direction of rotation.

b. To minimize a possible out-of-round condition when mounting new tires, ensure that the white dot on the wheel lines up with the red or white dot on the tire. Then, balance the tires using a dynarnic balancer.

c. Ensure that the new tires are correctly inflated: Front, 33 PSI (cold); Rear, 36 PSI (cold).

PARTS INFORMATION:





A Dunlop Tire with improved wear characteristics is available. These tires can be identified by the "DOT" number on the side of the tire:

Countermeasure DOT number information:

Beginning with:
Non-Turbo DOT U28J4M9 310

Turbo DOT U28JXM9 030

The last three numbers of the DOT Number indicate the number of the week and the production year as shown in the example below:

EXAMPLE:





The replacement tires were produced beginning the 31st week in 1990, for Non-Turbo Tires.





The replacement tires were produced beginning the 3rd week in 1990, for Turbo Tires.