Bonneville V6-231 3.8L VIN 3 SFI (1988)
Compressor Pulley: All Technical Service Bulletins
Drive Belt - Chirp or Squeal
Bulletin Number:
88-6-43
Reference Number:
806103
Publish Date:
5/88
Subject:
BELT CHIRP OR SQUEAL
Models 1987-88 BONNEVILLE WITH 3.8L SFI OR 3800
Affected:
ENGINE (VIN CODES 3 AND C); 1986-87 GRAND AM WITH 3.0L MFI ENGINE (VIN CODE L)
"This bulletin supersedes bulletin 86-6 (Gasoline)-41 dated May, 1986, due to a change in models affected. Please discard 86-6 (Gasoline)-41 and
replace it with this revision which provides additional application coverage."
Some 1986 through 1988 vehicles equipped with a single belt accessory drive (SBAD) system, may experience a belt chirp or squeal that cannot be
corrected by normal service procedures. It has been determined that the root cause of this condition is pulley misalignment. The following procedure
may be used to correct alignment as necessary.
FIGURE 1
The two most likely pulleys requiring alignment are the A/C compressor or crankshaft pulley. To determine which component must be shimmed, visually
sight belt spans No. 1, 2, and 3 from View "A", (see Figure 1).
FIGURE 2
