This factory service and repair manual for the 1998 GMC T6500 has three engines on its list for one chassis designation, F6B042. Two are turbocharged inline-six diesels, a 7.2L of 441 cubic inches and a 6.6L of 403 cubic inches, and the third is a naturally aspirated 6.0L gasoline V8 of 366 cubic inches, all overhead-valve. Because any of the three could be under the cab, the specifications, torque values, wiring diagrams and diagnostic sequences are kept separate for each engine and grouped by system.
Engines covered
- 6.0L V8 (366 cu in) — OHV, naturally aspirated, gasoline
- 7.2L inline-six (441 cu in) — OHV, turbocharged, diesel
- 6.6L inline-six (403 cu in) — OHV, turbocharged, diesel
Trims covered
- F6B042
Known issues on the 1998 T6500. The federal record for this model year is clean, with no recalls and no owner complaints logged with NHTSA. That puts the weight of the manual on routine work: the two turbocharged diesel sixes and the gasoline V8, each with their own specifications and torque values; the driveline and brake procedures for a medium-duty chassis; and the wiring diagrams and diagnostic routines that make an unfamiliar fault traceable on a truck with no documented pattern of failures behind it.
This warranty administration bulletin provides information regarding the field action courtesy transportation policy.
THIS TECHNICAL BULLETIN PROVIDES A PROCEDURE TO REPROGRAM THE MEDIA DISC PLAYER WITH THE LATEST CALIBRATIONS TO CORRECT A CONDITION OF THE REAR ENTERTAINMENT SYSTEM NOT OPERATING AS INTENDED IN COLDER AMBIENT TEMPERATURE AREAS DUE TO CALIBR
Expanded Availability for Remanufacture and Return (R&R) Electronic Control Modules
SOME MEDIUM DUTY TILT CAB TRUCKS WITH 3116 CATERPILLAR DIESEL ENGINES EQUIPPED WITH 26 INCH FAN BLADES MAY EXHIBIT THE ENGINE OVERHEAT LAMP ON, AND THE TEMPERATURE GAUGE IN THE RED ZONE. *TT
ON SOME MEDIUM DUTY TRUCKS EQUIPPED WITH A DIESEL ENGINE, AIR BRAKES, AND THE ENGINE SHUTDOWN FEATURE, THE MULTI-FUNCTION ALARM MODULE MAY NOT PERFORM CERTAIN FEATURES SUCH AS: NO WARNING TONE FOR AIR BRAKE LOW PRESSURE; NO WARNING TONE FOR
AIR INLET RESTRICTION GAUGES THAT POP OR THAT THE VEHICLE EXHIBITS LOW HORSEPOWER. YD
