INFO. ON INSTALLATION OF A 6.5L DIESEL GOODWRENCH ENGINE. GMC Truck GMC G Van 1988

SUBJECT: INFORMATION ON INSTALLATION OF A 6.5L DIESEL GOODWRENCH ENGINE INTO A 1988-98 MODEL YEAR VEHICLE (APPROPRIATE SERVICE KITS SHIPPED TOGETHER WITH GOODWRENCH ENGINES FROM GMSPO)

MODELS: 1988-98 CHEVROLET AND GMC B, C/K, G, P MODELS - WITH 6.2L OR 6.5L DIESEL ENGINE (VINS C, J, P, S, Y, F, - RPOS LH6, LL4, L49, L56, L57, L65)

THE 6.5L DIESEL GOODWRENCH ENGINES CONSIST OF A BLOCK WITH MINOR CASTING AND MACHINING CHANGES FOR THE 1988-98 MODEL YEARS. THE REVISED BLOCK CASTING HAS ADDITIONAL ENGINE BRACKET MOUNTING BOSSES THAT ARE USED EXCLUSIVELY ON THE GMT 800 SERIES PICKUP. THE ENGINE BRACKET MOUNTING BOSSES FOR ALL OTHER VEHICLES REMAIN IN THEIR ORIGINAL LOCATION. THE GOODWRENCH 6.5L DIESEL ENGINES INCLUDE CONVERSION TO METRIC THREAD FASTENERS. THE FASTENER LOCATIONS ARE THE ENGINE BRACKET MOUNTING BOSSES AND THE TRANSMISSION TO ENGINE ATTACHING POINTS ARE NOW MACHINED WITH A METRIC THREAD.

IMPORTANT: THE METRIC MACHINED BLOCK CAN BE IDENTIFIED BY A YELLOW PAINT MARK LOCATED BETWEEN #2 AND #3 FREEZE PLUG ON BOTH SIDES OF THE BLOCK (FIGURE 1, ITEM 1). AN ADDITIONAL MARK IS LOCATED ON THE LEFT REAR OF THE BLOCK (FIGURE 2, ITEM 1).

PROCEDURE:

WHEN INSTALLING A GOODWRENCH ENGINE INTO A PRIOR MODEL YEAR VEHICLE, THE LEFT SIDE ENGINE BRACKET MOUNTING BOSSES INTERFERE WITH THE INSTALLATION OF THE ORIGINAL LEFT SIDE ENGINE BRACKET. BECAUSE OF THIS INTERFERENCE, A LEFT SIDE ENGINE BRACKET (99 PART, RE-USE THE RIGHT BRACKET) MUST BE USED WHEN INSTALLING A GOODWRENCH ENGINE INTO A 1998 OR PRIOR DIESEL EQUIPPED VEHICLE. IN ADDITION, BECAUSE OF THE METRIC CONVERSION, METRIC FASTENERS ARE REQUIRED TO ATTACH THE ENGINE BRACKETS (BOTH SIDES) TO THE BLOCK, AND TO ATTACH THE TRANSMISSION TO THE ENGINE.

GMSPO HAS RELEASED SERVICE KITS THAT WILL SIMPLIFY THE INSTALLATION OF THE GOODWRENCH ENGINE INTO A PRIOR MODEL YEAR DIESEL EQUIPPED VEHICLE. THE KIT INCLUDES THE NECESSARY BRACKET AND FASTENERS FOR THE SPECIFIC APPLICATION AND WILL BE SHIPPED TOGETHER WITH THE GOODWRENCH ENGINE.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION LABOR OPERATION NUMBER DESCRIPTION TIME --------------- ----------- ---------------

J1840 ENGINE, UNIVERSAL - REPLACE USE PUBLISHED LABOR OPERATION TIME

FIGURES: 02 ATTACHMENTS: 00

Object Number: 484203 Size: SH

Object Number: 484205 Size: SH

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.