CAMPAIGN:SOFT CRANKSHAFT SPROCKETS (NO HEAT - TREAT)
SUBJECT: SOFT CRANKSHAFT SPROCKETS (NO HEAT-TREAT)
MODELS: 1993 C/K, G, P TRUCKS WITH 7.4L ENGINES (VIN CODE N)
GMC TRUCK ONLY THIS BULLETIN CANCELS AND REPLACES BULLETIN ISSUED JUNE 1993. DESTROY ALL COPIES OF EARLIER BULLETIN.
REVISIONS INCLUDE AN ADDED STEP TO THE SERVICE PROCEDURE AND CHANGES IN THE WARRANTY INFORMATION.
GENERAL MOTORS HAS DETERMINED THAT CERTAIN 1993 C/K, G, AND P TRUCKS WITH THE 7.4L GAS ENGINES MAY HAVE BEEN BUILT WITH SOFT CRANKSHAFT SPROCKETS. A NON-HARDENED SPROCKET WILL HAVE EXCESSIVE WEAR AND COULD CAUSE AN ENGINE FAILURE.
TO PREVENT THIS FAILURE FROM OCCURRING, DEALERS ARE TO REPLACE THE CRANKSHAFT SPROCKET. IN THE EVENT THAT THE TRUCK IS TOWED IN AND IT IS DETERMINED THAT THE CRANKSHAFT SPROCKET HAS FAILED, THE ENGINE SHOULD BE REPLACED. TO REPLACE THE ENGINE, CALL YOUR TECHNICAL ASSISTANCE DEPARTMENT FOR A NEW ENGINE REPLACEMENT AND SPECIAL INSTRUCTIONS.
VEHICLES INVOLVED
INVOLVED ARE CERTAIN 1993 C/K, G, P TRUCKS EQUIPPED WITH OPTION (L19) 7.4L TBI GAS ENGINE AND BUILT WITHIN THE FOLLOWING VIN BREAKPOINTS:
GMC TRUCK
YEAR MODEL PLANT FROM THROUGH
1993 C E PE502218 PE510574
J PJ500613 PJ708196
1 P1504168 P1517580
K E PE502197 PE519555
J PJ700071 PJ704234
1 P1504267 P1508729
G 4 P4501039 P4503018
P 3 P3500229 P3500320
CHEVROLET
1993 C/K 1 P1111118 P1145517
C/K Z PZ119239 PZ120742
C/K J PJ100666 PJ316626
C/K E PE107760 PE155714
G VAN 4 P4102889 P4105767
P TRUCK 3 P3301484 P3312162
THE SPECIFIC VEHICLES INVOLVED IN THIS CAMPAIGN HAVE BEEN IDENTIFIED BY VEHICLE IDENTIFICATION NUMBER COMPUTER LISTINGS. THESE LISTINGS ARE FURNISHED TO ALL INVOLVED DEALERS WITH THE CAMPAIGN BULLETIN. DEALERS SHOULD CONFIRM VEHICLE ELIGIBILITY THROUGH VISS (VEHICLE INFORMATION SERVICE SYSTEM) PRIOR TO BEGINNING CAMPAIGN REPAIRS.
THESE LISTINGS MAY CONTAIN OWNER NAMES AND ADDRESSES OBTAINED FROM STATE MOTOR VEHICLE REGISTRATION RECORDS. THE USE OF SUCH MOTOR VEHICLE REGISTRATION DATA FOR ANY OTHER PURPOSE IS A VIOLATION OF LAW IN SEVERAL STATES. ACCORDINGLY, YOU ARE URGED TO LIMIT THE USE OF THIS LISTING TO THE FOLLOW-UP NECESSARY TO COMPLETE THIS CAMPAIGN. ANY DEALER NOT RECEIVING A COMPUTER LISTING WITH THE CAMPAIGN BULLETIN HAS NO INVOLVED VEHICLES CURRENTLY ASSIGNED.
SERVICE PROCEDURE
1. REMOVE TORSIONAL DAMPER AND FRONT COVER PER THE 1993 SERVICE MANUAL, SECTION 6A5 USING TOOL J 39046.
NOTICE EXTREAM CARE SHOULD BE USED WHEN REMOVING FRONT COVER FROM ENGINE BLOCK TO PREVENT DAMAGE TO OIL PAN GASKET. OIL PAN GASKET IS ATTACHED TO FRONT COVER AT RTV JOINTS.
2. REMOVE CRANKSHAFT SPROCKET USING TOOL J 28509-A. SEE SECTION 6A5 IN THE SERVICE MANUAL.
3. INSPECT CRANKSHAFT SPROCKET FOR EXCESS WEAR. PLACE NEW CRANLSHAFT SPROCKET AND CRANKSHAFT SPROCKET REMOVED FROM TRUCK ON A FLAT SURFACE ON EDGE (SEE ILLUSTRATION #1). IF OLD GEAR IS 1/8 (0.125) INCH SMALLER, GO TO STEP #4. IF OLD GEAR IS THE SAME OR LESS THAN 1/8 (0.125) GO TO STEP #5.
4. INSTALL NEW CRANKSHAFT SPROCKET USING TOOL J 22102, CAMSHAFT SPROCKET, AND TIMING CHAIN, AND MAGNETIC DRAIN PLUG.
5. ONLY INSTALL NEW CRANKSHAFT SPROCKET USING TOOL J 22102.
6. INSTALL FRONT COVER AND TORQUE BOLTS TO 10 N-M (96 LBS IN). INSTALLTORSIONAL DAMPER AND TORGUE BOLT TO 115 N-M (85 LBS FT.).
7. CHANGE OIL AND FILTER.
8. ONLY RETURN THE CRANKSHAFT SPROCKET TO: G.M. POWERTRAIN 30003 VAN DYKE WARREN, MI 48090 ROOM 2-207
NOTICE ALL CRANKSHAFT SPROCKETS ARE TO BE TAGGED WITH COMPLETE VIN #, MILEAGE, AND DATE.
9. INSTALL CAMPAIGN IDENTIFICATION LABEL.
PARTS INFORMATION
PARTS ARE TO BE OBTAINED FROM GENERAL MOTORS SERVICE PARTS OPERATION (GMSPO). TO ENSURE THAT THESE PARTS WILL BE OBTAINED AS SOON AS POSSIBLE, THEY SHOULD BE ORDERED FROM GMSPO ON A C.I.O. ORDER WITH NO SPECIAL INSTRUCTION CODE BUT ORDER UNDER AN ADVISE CODE (2).
PART NUMBER DESCRIPTION QUANTITY
03902426 CRANKSHAFT SPROCKET 1 10114161 FRONT COVER GASKET 1 14103224 TIMING CHAIN 1 (IF REQUIRED) 00330814 CAMSHAFT SPROCKET 1 (IF REQUIRED) 25013977 OIL FILTER (PF1218) 1 12345616 OIL, 10W-30 5 QTS. 23011420 MAGNETIC DRAIN PLUG 1 (IF REQUIRED) 3860039 WATER PUMP GASKET 2
NOTE: TO CHEVROLET DEALERS
IN THE EVENT THAT A TRUCK IS TOWED IN AND AN ENGINE REPLACEMENT IS REQUIRED DUE TO CRANKSHAFT SPROCKET FAILURE, OBTAIN AN EXCHANGE ENGIN THROUGHT THE TECHNICAL ASSISTANCE NETWORK.
WARRANTY INFORMATION
GMC TRUCK WARRANTY INFORMATION
DEALERS SHOULD SUBMIT A WARRANTY CLAIM ON EACH VEHICLE COMPLETED UNDER THIS CAMPAIGN.
LABOR OPERATION *TIME TROUBLE PARTS ***NET NUMBER DESCRIPTION ALLOWANCE CODE ALLOWANCE AMOUNT
V8090 REPLACE CRANKSHAFT C/K 2.6 96 ** $ #.## SPROCKET, OIL AND G 2.9 FILTER P 3.5
V8093 REPLACE CRANKSHAFT C/K 2.6 96 ** $ #.## SPROCKET, CAM/SHAFT G 2.9 SPROCKET, TIMING P 3.5 CHAIN, OIL PAN PLUG, OIL & FILTER
V8096 REPLACE ENGINE C/K 6.1 96 **** G 8.3 **** P 7.8 ****
* FOR DEALER TO RECEIVE ADMINISTRATIVE TIME ALLOWANCE ASSOCIATED WITH THIS CAMPAIGN, ADD 0.1 HOUR TO THE LABOR OPERATION TIME ALLOWANCE.
** THE "PARTS ALLOWANCE" SHOULD BE THE SUM TOTAL OF THE CURRENT GMSPO DEALER NET PRICE PLUS 30% OF ALL PARTS REQUIRED FOR THE REPAIR.
*** THE $ #.## SHOWN IN THE "NET AMOUNT" COLUMN REPRESENTS 0.2 HOURS LABOR AND UPS SHIPMENT CHARGES REQUIRED FOR RETURNING REPLACED CRANKSHAFT SPROCKETS.
**** DEALERS ARE TO CONTACT TECHNICAL ASSISTANCE CENTER 1-800-456-XXX FOR AUTHORIZATION OF EXTRA LABOR TIME AND PARTS ALLOWANCE, IF REQUIRED.
CHEVROLET WARRANTY INFORMATION
THE CHEVROLET WARRANTY INFORMATION WAS NOT AVAILABLE WHEN THIS CAMPAIGN WAS ENTERED IN TAS. PLEASE SEE THE PAPER COPY SENT TO YOUR DEALERSHIP.
NOTE: IN THE EVENT THAT THE TRUCK HAS BEEN TOWED IN AND IT IS DETERMINED THAT THE CRANKSHAFT SPROCKET HAS FAILED, ENGINE REPLACEMENT CLAIMS SHOULD BE SUBMITTED UNDER WARRANTY USING LABOR OPERATION J1880. USE APPLICABLE LABOR TIME GUIDE FOR LABOR 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.
