Engine - Oil Pump To Front Cover Causing Whine Noise
88buick18Bulletin 89-6-4
Date Nov. '88
Ref. No. 88-252-6
Corp. Ref. No. 876117
WHINE NOISE IN PASSENGER COMPARTMENT
MODELS AFFECTED: 1985-87 SOMERSETS WITH 3.0L V-6 ENGINES (VIN CODE L) 1986-89 SKYLARKS WITH 3.0L V-6 ENGINES (VIN CODE L)
A minor whine type noise may be heard in the passenger compartment of 1985-1988 subject models equipped with a 3.0L V-6 engine. This whine, usually most noticeable at approximately 3000 revolutions per minute (rpm), is a result of engine oil pump to front cover alignment which can excite a resonance in the rear engine mount to engine bracket. This resonance can be transmitted to the passenger compartment as a whine.
Vehicles exhibiting this condition can be repaired by installing a new right rear engine mount to engine bracket kit as described in the following service procedure.
Part is currently available from GMSPO under the following part number:
12340523 Bracket Kit - Right Rear Engine Mount to Engine
Bracket Kit contains:
- Right rear engine mount to engine bracket
- Stud
- Nut
NOTICE: As in any service procedure, diagnostics are the key to an effective repair. Before performing the following procedure refer to Dealer Technical Bulletins 87-6-26 and 86-6-3.
SERVICE PROCEDURE
Tools required: J 28467 Engine Support Fixture
FIGURE 1:
REMOVAL OF ORIGINAL RIGHT REAR ENGINE MOUNT TO ENGINE BRACKET (Figure 1):
1. Disconnect negative battery cable.
2. Install J 28467 engine support fixture.
3. Raise car and suitably support. See Section OA in service manual.
4. Remove right-hand drive axle assembly
5. Remove right rear engine mount (No. 7)
6. Remove speed sensor heat shield (No. 2) and transaxle brace (No. 3).
7. Remove right rear engine mount to engine bracket (No. 6)
8. Remove bolt from lower mounting hole of drive belt tensioner assembly (No. 4).
FIGURE 2:
INSTALL NEW RIGHT REAR ENGINE MOUNT TO ENGINE BRACKET KIT (Figure 2)
1. Install long end of new stud (No. 4) in lower mounting hole of drive belt tensioner assembly. Tighten stud to 50 N-m (38 ft.lbs.).
2. Install new right rear engine mount to engine bracket (No. 6) into position.
3. Install new nut (No. 5) on drive belt tensioner assembly stud. Tighten nut to 45 N-m (34 ft.lbs.).
4. Install right rear engine mount (No. 7). Hand start two bolts (No. 10) and two nuts and reinforcement plate (No. 9). DO NOT TIGHTEN YET.
5. Install transaxle brace (No. 3) and speed sensor heat shield (No. 2) to transaxle. Hand start bolts (No. 12). DO NOT TIGHTEN.
6. Install transaxle brace to right rear engine mount to engine bracket bolts (No. 11). Tighten to 95 N-m (70 ft.lbs.).
7. Tighten the right rear engine mount to right rear engine mount to engine bracket bolts (No. 10) to 50 N-m (38 ft.lbs.)
8. Tighten speed sensor heat shield and transaxle brace to transaxle bolts (No. 12) to 50 N-m (38 ft.lbs.)
9. Tighten right rear engine mount to rear engine mount bracket nuts (No. 9) to 24 N-m (18 ft.lbs.).
10. Install right-hand drive axle assembly; wheel and tire assembly.
11. Remove J 28467 engine support fixture.
12. Connect negative battery cable.
WARRANTY INFORMATION
Labor Operation Number: T 4641
Labor Time: 1.2 Hours
Trouble Code: 92