MAIN BEARING USAGE CHART P/N SPECIFICATIONS. Cadillac Allante 1988

REVISION: 05/25/94

THIS BULLETIN CANCELS BULLETIN 216104R. DIVISIONAL PUBLICATION NUMBERS WERE:

CADILLAC T-93-1 GM OF CANADA 93-6A-107

THIS BULLETIN IS BEING REVISED TO ADD 1991-94 MODEL YEARS, D MODEL AND 4.9L ENGINE. PARTS INFORMATION HAS ALSO BEEN UPDATED. PREVIOUS DIVISIONAL PUBLICATION NUMBERS WERE:

CADILLAC T-92-132 GM OF CANADA 88-641-104

REVISION: 10/11/95

THIS BULLETIN IS BEING REVISED TO PROVIDE ADDITIONAL CRANKCASE IDENTIFICATION INFORMATION. PLEASE DISCARD BULLETIN 816103 (GROUP REFERENCE 6 - ENGINE). **********************************************************************

SUBJECT: INFORMATION ON MAIN BEARING USAGE

MODELS: 1982-84 CADILLAC DEVILLE (RWD) 1982-85 CADILLAC FLEETWOOD BROUGHAM (RWD) 1982-93 CADILLAC ELDORADO 1982-93 CADILLAC SEVILLE 1985-93 CADILLAC FLEETWOOD AND SIXTY SPECIAL 1987-92 CADILLAC ALLANTE 1987-94 CADILLAC DEVILLE

THIS SUMMARY OF MAIN BEARING APPLICATIONS IS INTENDED TO CLARIFY CURRENT BEARING AVAILABILITY AND TO IDENTIFY WHICH BEARINGS ARE IN 1982-1994 ENGINES. THIS INFORMATION IS NOT INTENDED TO SUPERSEDE THE GMSPO PARTS BOOKS AND FUTURE PARTS CATALOG REVISIONS. SUPERSEDED PART NUMBERS WILL BE HANDLED THROUGH GMSPO.

DURING THE 1991 MODEL YEAR, THE CYLINDER BLOCK USED FOR THE 4.5L AND 4.9L TRANSVERSE V8 ENGINES RECEIVED A SERIES OF STRUCTURAL ENHANCEMENTS THAT HAVE MADE DIMENSIONAL ADJUSTMENTS IN MAIN BEARING CLEARANCE NECESSARY TO PREVENT MAIN BEARING KNOCK (MALLET NOISE) IN SOME VEHICLES. THESE CRANKCASE CHANGES ARE **NOT** INCORPORATED IN ALL 1991 VEHICLES BUT ARE INCLUDED IN ALL 1992 AND LATER ENGINES. THE IMPROVED CRANKCASE IS ALSO USED TO ASSEMBLE SERVICE ENGINE ASSEMBLIES PRODUCED AFTER SEPTEMBER 1, 1991 (I.E., A SERVICE ENGINE BUILT IN 1992 CALENDAR YEAR FOR USE IN ANY MODEL YEAR INCLUDING PAST MODELS WILL INCLUDE THE STRUCTURALLY UPDATED TRANSVERSE CRANKCASE). REFER TO FIGURES 1 AND 2 TO IDENTIFY THE UPDATED CRANKCASE.

THE PROCEDURE NECESSARY TO ESTABLISH WHICH BEARING (STANDARD OR OVERSIZE) SHOULD BE INSTALLED IN THE #1 OR #5 POSITION IS CONTAINED IN SERVICE BULLETIN T-84-5C AS WELL AS 1987 AND LATER SERVICE INFORMATION MANUALS. THIS PROCEDURE APPLIES TO ALL 4.1L, 4.5L AND 4.9L V8 ENGINES.

1982-91 4.1L, 4.5L AND 4.9L V8 ENGINE BEARING APPLICATIONS ---------------------------------------------------------- BEARING PARTS POSITION EDGE SERVICE REPLACED NUMBER APPLICATION COLOR P/N* P/N** BY -------- ----------- ----- ---- ------- -------- 1 ORIGINAL PRODUCTION NONE 18006622 18009086 2ND DESIGN PRODUCTION PURPLE 18012275 18012316 3RD DESIGN PRODUCTION RED 18014079 18014329 3545718 *** 4TH DESIGN PRODUCTION RED 18021447 3545718 *** SERVICE ONLY US (2ND DESIGN) BLUE 18012276 18012317 SERVICE ONLY US (3RD DESIGN) BLUE 18014306 18014307 SERVICE ONLY US (4TH DESIGN) BLUE 18020263 18020292 3545719 SERVICE ONLY US (5TH DESIGN) BLUE 18021478 3545719

3 ORIGINAL PRODUCTION NONE 18006623 18009088 3545721 *** 2ND DESIGN PRODUCTION NONE 1640033 3545721 ***

2 AND 4 ORIGINAL PRODUCTION NONE 18006622 18009086 2ND DESIGN PRODUCTION NONE 18013016 18013442 3545720 *** 3RD DESIGN PRODUCTION NONE 18020668 3545720 ***

5 ORIGINAL PRODUCTION NONE 18006624U 18009087 18006625L 2ND DESIGN PRODUCTION PINK 18013791U 18013793 18013792L 3RD DESIGN PRODUCTION GREEN 18013607 18013789 3545722 *** 4TH DESIGN PRODUCTION GREEN 18020669 3545722 *** SERVICE ONLY US (2ND DESIGN) BLUE 18012876U 18012878 18013608L SERVICE ONLY US (3RD DESIGN) BLACK 18013608 18013790 3545723 *** SERVICE ONLY US (4TH DESIGN) BLACK 18021480 3545723 ***

1991-94 4.5L AND 4.9L V8 ENGINE BEARING APPLICATIONS ---------------------------------------------------- ***THE BEARING APPLICATIONS LISTED BELOW SHOULD ONLY BE USED WITH THE STRUCTURALLY IMPROVED CRANKCASE SHOWN IN FIGURE 2.***

BEARING PARTS POSITION EDGE SERVICE REPLACED NUMBER APPLICATION COLOR P/N* P/N** BY -------- ----------- ----- ---- ------- -------- 1 ORIGINAL PRODUCTION RED 18020293 18020399 3545716 *** 2ND DESIGN PRODUCTION RED 18020635 3545716 *** SERVICE ONLY US BLUE 18020315 18020316 3545717 *** SERVICE ONLY US (2ND DESIGN) BLUE 18021479 3545717 ***

***3 ORIGINAL PRODUCTION NONE 1640033 3545721 ***

2 AND 4 ORIGINAL PRODUCTION NONE 18013016 18013442 3545720 *** 2ND DESIGN PRODUCTION NONE 18020668 3545720 ***

5 ORIGINAL PRODUCTION GREEN 18013607 18013789 3545722 *** 2ND DESIGN PRODUCTION GREEN 18020669 3545722 *** SERVICE ONLY US BLACK 18013608 18013790 3545723 *** SERVICE ONLY US (2ND DESIGN) BLACK 18021480 3545723 ***

(PARTS IN ***BOLD FACE*** TYPE ARE CURRENTLY RECOMMENDED.)

* "PART NUMBER" IS NUMBER STAMPED ON BACK OF BEARING SHELL. USE THIS NUMBER FOR IDENTIFICATION.

** "SERVICE PART NUMBER" IS NUMBER ASSIGNED BY GMSPO (CONSISTS OF TWO BEARING HALVES) AND IS PRINTED ON THE BOX. USE THIS NUMBER FOR ORDERING PARTS.

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

CRANKCASE IDENTIFICATION (FIGURES 1 AND 2) TO DETERMINE WHICH STYLE CRANKCASE IS BEING WORKED ON AND WHICH BEARING CHART APPLIES, REFER TO THE FIGURES BELOW. NOTE 1991 MODEL YEAR VEHICLES (AS WELL AS EARLIER MODEL YEAR VEHICLES HAVING EXPERIENCED AN ENGINE REPLACEMENT) MAY CONTAIN EITHER CRANKCASE. FIGURE 1 ILLUSTRATES A TYPICAL CRANKCASE SHOWING THE ONLY SIGNIFICANT DIFFERENCES FOR BEARING SELECTION PURPOSES. EARLIER CRANKCASES MAY NOT EXHIBIT ALL THE FEATURES SHOWN.

THE 1990 AND EARLIER "STYLE" BLOCKS HAVE THE FOLLOWING FEATURES:

- LESS EXTENSIVE RIBBING - A "THINNER" PAN RAIL (6-7 MM THICKNESS)

1991 BLOCKS MAY BE EITHER OF THE TWO "STYLES" DESCRIBED ABOVE.

THE 1992 AND LATER "STYLE" BLOCKS HAVE THE FOLLOWING FEATURES:

- ADDITIONAL VERTICAL RIBBING ON LOWER HALF OF BLOCK - A THICKER PAN RAIL (12-13 MM THICKNESS) - 4 CAST PADS WHICH ARE 6-7 MM THICK

FIGURES: 2

Object Number: 84463 Size: FS

Object Number: 84462 Size: FS

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.