SMU- SECTION 6A9 REVISED CRANKSHAFT INSTALL PROCEDURE. Chevrolet Lumina 1995

SUBJECT: SERVICE MANUAL UPDATE - SECTION 6A9 - REVISED CRANKSHAFT INSTALLATION PROCEDURE

MODELS: 1991-95 CHEVROLET LUMINA 1995 CHEVROLET MONTE CARLO 1991-95 OLDSMOBILE CUTLASS SUPREME 1991-95 PONTIAC GRAND PRIX WITH 3.4L ENGINE (VIN X - RPO LQ1)

THE CRANKSHAFT INSTALLATION PROCEDURE HAS BEEN REVISED. USE THE FOLLOWING PROCEDURE TO PROPERLY INSTALL AND SEAT THE CRANKSHAFT. THIS PROCEDURE SHOULD BE USED ALONG WITH THE PROCEDURE FOUND IN THE APPROPRIATE SERVICE MANUAL.

CRANKSHAFT INSTALLATION PROCEDURE FIGURE 1

TOOL REQUIRED: J36660 TORQUE ANGLE METER

MANUAL TRANSAXLE:

**REMOVE OR DISCONNECT** 1. REMOVE AND INSPECT CRANKSHAFT. REFER TO SECTION 6A9 IN APPLICABLE SERVICE MANUAL. 2. LUBRICATE ROD AND MAIN BEARINGS WITH CLEAN ENGINE OIL.

**INSTALL OR CONNECT** NOTICE: USE CARE WHEN INSTALLING CRANKSHAFT TO AVOID DAMAGING JOURNALS, BEARING INSERTS, OR CONNECTING RODS. 3. CRANKSHAFT. 4. MAIN BEARING CAPS AND STUDS/BOLTS. NOTE: FAILURE TO THRUST CRANKSHAFT PER PROCEDURE MAY CAUSE PREMATURE BEARING OR CRANKSHAFT WEAR. 5. WITH CRANKSHAFT BEARINGS AND BEARING CAPS INSTALLED AND STUDS/ BOLTS STARTED, THRUST CRANKSHAFT FORWARD TO SET AND ALIGN BEARING CAPS, THEN THRUST CRANKSHAFT REARWARD TO ALIGN FRONT FACE OF #3 THRUST MAIN BEARING. TIGHTEN: - MAIN BEARING STUDS/BOLTS TO 50 N.M (37 LB. FT.) + 75 DEGREES USING J36660. - CONNECTING ROD CAP NUTS EVENLY TO 20 N.M (15 LB. FT.) + 75 DEGREES USING J36660. 6. REFER TO SECTION 6A9 IN APPLICABLE SERVICE MANUAL FOR REASSEMBLY.

AUTOMATIC TRANSAXLE:

**REMOVE OR DISCONNECT** 1. REMOVE AND INSPECT CRANKSHAFT. REFER TO SECTION 6A9 IN APPLICABLE SERVICE MANUAL. 2. LUBRICATE ROD AND MAIN BEARINGS WITH OIL.

**INSTALL OR CONNECT** NOTICE: USE CARE WHEN INSTALLING CRANKSHAFT TO AVOID DAMAGING JOURNALS, BEARING INSERTS, OR CONNECTING RODS. 3. CRANKSHAFT. 4. MAIN BEARING CAPS AND STUDS/BOLTS. NOTE: FAILURE TO THRUST CRANKSHAFT PER PROCEDURE MAY CAUSE PREMATURE BEARING OR CRANKSHAFT WEAR. 5. WITH CRANKSHAFT BEARINGS AND BEARING CAPS INSTALLED AND STUDS/ BOLTS STARTED, THRUST CRANKSHAFT REARWARD TO SET AND ALIGN BEARING CAPS, THEN THRUST CRANKSHAFT FORWARD TO ALIGN FRONT FACE OF #3 THRUST MAIN BEARING. TIGHTEN: - MAIN BEARING STUDS/BOLTS TO 50 N.M (37 LB. FT) + 75 DEGREES USING J36660. - CONNECTING ROD CAP NUTS EVENLY TO 20 N.M (15 LB. FT.) + 75 DEGREES USING J36660. 6. REFER TO SECTION 6A9 IN APPLICABLE SERVICE MANUAL FOR REASSEMBLY.

FIGURE 1 - SEATING CRANKSHAFT THRUST BEARING (NG0876A)

FIGURES: 1

Object Number: 94224 Size: SF

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.