SERVICE MANUAL UPDATE SEC. 3A WHEEL ALIGNMENT

SUBJECT SERVICE MANUAL UPDATE - WHEEL ALIGNMENT - REVISED SPECIFICATION CHART (REPLACES FIGURE 6 AND 6A)

MODELS/YEARS 1990 SILHOUETTE

The following chart of Specifications For Alignment Diagnosis replaces Figure 6 and 6A in the 1990 Silhouette Service Manual on page 3A-6.

SPECIFICATIONS FOR ALIGNMENT DIAGNOSIS

DEGREES (PER WHEEL) FRONT REAR (NOT ADJUSTABLE) ------------------- ---------- ---------------- TOE 0 +\- 0.20 0 +\- 0.30

CAMBER 0 +\- 0.50 -0.10 +\- 0.30

CASTER

VEHICLE MUST BE JOUNCED THREE TIMES BEFORE CHECKING ALIGNMENT TO ELIMINATE FALSE GEOMETRY READINGS.

TOE ADJUSTMENT TO BE SET SEPARATELY PER WHEEL, WITH STEERING WHEEL HELD IN "STRAIGHT-AHEAD" POSITION WITHIN +\- 5 degrees.

TOE-IN IS EXPRESSED AS + DEGREES. TOE-OUT IS EXPRESSED AS - DEGREES.

CROSS CAR CAMBER MUST BE WITHIN 0.7 degrees.

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.