RATTLES AND/OR OTHER NOISES WITH HARDTOP INSTALLED

MODELS AFFECTED: 1987 ALLANTE

Some 1987 Allante's built before VIN 001100 may experience squeaks and/or rattles while driving with the hardtop installed. The noise level of this condition will increase with mileage accumulation. This condition may be caused by relative motion between the hardtop and body.

To repair this condition, install reinforcement plates, P/N 1645171 (two required) using the following procedure:

1. Remove hardtop and place upside down on a protected surface.

2. Measure and note height of side locating pins from the weatherstrip retainer to the cone base (refer to Figure 1).

3. Loosen jam nut and remove locating pin from base of B-pillar.

4. Position the reinforcement plate on the hardtop (refer to Figure 2).

5. Apply Loctite 271 or equivalent to entire threaded portion of locating pin.

6. Install pin into base of B-pillar and adjust to the measured height noted in step 2.

7. Tighten jam nut to 6-8 N.m.

8. Repeat steps 2-7 on opposite side.

9. Install hardtop.

NOTE: Some further adjustment of the B-pillar latch hook tength may be required to eliminate the remaining squeaks and/or rattles. The latching effort should be firm, but not so much as to be uncomfortable to unlatch with one thumb. Loctite the hook length adjuster threads when making this adjustment.

For warranty purposes, use Labor Operation T6220 at .4 hours.

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.