This factory service and repair manual for the 1987 GMC W6500 Forward covers a single displacement in two states of tune: the 5.8L inline-six of 353 cubic inches, offered naturally aspirated and turbocharged, both diesel. Trim code W6R042 accounts for the whole run, and the body underneath it is the low tilt straight truck. Because the two versions match in displacement and layout but not in induction, the manual states specifications, torque values and diagnostic procedures for each of them separately.
Engines covered
- 5.8L inline-six (353 cu in) — naturally aspirated, diesel
- 5.8L inline-six (353 cu in) — turbocharged, diesel
Body styles covered
- Straight truck, low tilt
Trims covered
- W6R042
Known issues on the 1987 W6500 Forward. The federal record for the 1987 W6500 Forward is clean, showing no recalls and no owner complaints logged with NHTSA. That leaves the manual's ordinary scope in view: two versions of the 353 cubic inch inline-six, one naturally aspirated and one turbocharged, each with its own procedures, specifications and torque values, plus the wiring diagrams and diagnostics for the chassis they are installed in.
