This factory service and repair manual for the 1993 GMC B7 covers a cab forward school bus, designated B7T042, with a choice between two very different engines: the naturally aspirated 6.0L OHV gasoline V8 and the turbocharged 6.6L OHV inline-six diesel. One runs on spark and a gasoline fuel system, the other on compression and a diesel injection system, and the manual gives each its own procedures, specifications, torque values and diagnostic routines before moving on to the chassis they share.
Engines covered
- 6.0L V8 (366 cu in) — OHV, naturally aspirated, gasoline
- 6.6L inline-six (403 cu in) — OHV, turbocharged, diesel
Body styles covered
- Bus (school), cab forward
Trims covered
- B7T042
Known issues on the 1993 B7. The federal record for this school bus is blank: no recall, no owner complaint. The manual's contribution is straightforward coverage of the hardware. Both engines are documented with procedures, specifications, torque values, wiring diagrams and diagnostics, and the cab forward chassis is treated the same way, from the frame and driveline to the brake, steering and electrical systems that a school bus is inspected on before every route.
A MANUFACTURING CONDITION IN THE THROTTLE BODY INJECTOR (TBI) UNIT MIGHT OCCUR TO ALLOW THE THROTTLE CAM LEVER TO DISENGAGE FROM THE THROTTLE DRIVE SHAFT.
IF THE THROTTLE CAM LEVER DISENGAGES FROM THE THROTTLEDRIVE SHAFT, THE ENGINE COULD GO TO WIDE OPEN
REPLACE THE THROTTLE DRIVE COVER ASSEMBLY.
THE INTERMEDIATE STEERING SHAFT WAS ASSEMBLED WITH LOOSE OR MISSING UPPER AND LOWER PINCH BOLTS WHICH MAY CAUSE SEPARATION OF THE SHAFT.
SEPARATION OF THE INTERMEDIATE STEERING SHAFT RESULTS IN TOTAL LOSS OF STEERING CONTROL AND COULD CA
DEALERS WILL PROPERLY TORQUE LOOSE PINCH BOLTS AND INSTALL PINCH BOLTS WHERE NECESSARY.
EFFECT OF STEERING BOX LIMITER ADJUSTMENT ON TURNING RADIUS AND POSSIBILITY OF POWER STEERING SYSTEM DAMAGE DUE TO IMPROPER ADJUSTMENT. VARIOUS 1990-2004 MODELS. *TT
RELEASE OF NEW REAR BRAKE PIPE SHIELDS. *TT
INFORMATION ON FUEL TANK SHIELDS. *TT
EXPERIENCING NOISY RELEASE BEARING, SLIPPING CLUTCH OR INOERATIVE CLUTCH. *TT
CONCERNS WITH INTERMITTENT MULTIFUNCTION ALARM ACTIVATION. *TT
COMMENTS ON ENGINE EXHAUST NOISE WHICH IS NORMALLY LOUDEST DURING COLD ENGINE OPERATION. *YC
VEHICLES WITH 6.0L AND 7.0L ENGINES (VINS P, M - RPOS LS0, LR0) MAY EXHIBIT ENGINE EXHAUST NOISE WHICH IS LOUDEST DURING COLD ENGINE OPERATION. *YC
CLUTCH SLIPPING/HIGH PEDAL EFFORT (INSTALL CLUTCH KIT). *TW
