Engine - Buzz or Whine
88pontiac03Number 87-6 (Gasoline)-71A Date 2/88
Subject: ENGINE BUZZ OR WHINE DUE TO LOOSE ENGINE MOUNTING BOLT
1987 GRAND AM MODELS WITH 3.0L (VIN CODE L)
This bulletin supersedes Bulletin 87-6(Gasoline)-71. The illustration has been revised to indicate the removal of the locating bolt after all engine mounts are secured. Also a Service Note has been added.
A whine, buzz or missing bolt on a 1987 Grand Am vehicle with a 3.0L VIN Code L engine with A/C may be caused by an engine mounting bolt losing torque.
Inspect the right front engine mounting bracket for a loose or missing bolt, see Fig. 1. Follow the steps outlined below :
Step 1. If bolt is missing, replace it with part number 11509793 and
torque to 60-80 N-m (44-60 ft.lbs.).
Step 2. If bolt is loose, remove the bolt, clean the threads and
apply Loctite 242 or equivalent to the bolt threads. Torque bolt to 40-60 N-m (30-44 ft.lbs.).
The new bolt (Part No. #11509793) was in production 4-13-87, breakpoints beginning with VIN number HC870266.
FIGURE 1:
SERVICE NOTE: Locating bolt shown in Figure 1 must be removed after all engine mounts are secured or engine vibration and noise will be transmitted into car body.