1990 Ford LN9000 Service and Repair Manual
This factory service and repair manual for the 1990 Ford LN9000 takes in five diesels: two six-cylinder engines of 10.5L (638 cu in) and 10.3L (629 cu in), and three turbocharged inline-sixes of 10.0L (611 cu in), 14.6L (893 cu in) and 14.0L (855 cu in). Body styles are the short-conventional tractor truck and the short-conventional straight truck, in Base trim. With two engine families on the list, the manual's specifications, torque values and wiring diagrams are given for each of the five, and the six-cylinder pair should not be confused with the turbocharged sixes when a figure is looked up.
Engines covered
- 10.5L six-cylinder (638 cu in) — diesel
- 10.0L inline-six (611 cu in) — turbocharged, diesel
- 14.6L inline-six (893 cu in) — turbocharged, diesel
- 14.0L inline-six (855 cu in) — turbocharged, diesel
- 10.3L six-cylinder (629 cu in) — diesel
Body styles covered
- Tractor truck, short conventional
- Straight truck, short conventional
Trims covered
- Base
Known issues on the 1990 LN9000. The 1990 LN9000 carries one recall on the federal record, for air brake check valves in the secondary service reservoir that may fail to seat because a circular brass guide interferes with the wall of its cylindrical ferrule. NHTSA lists no owner complaints for the 1990 LN9000. The manual's air brake procedures, specifications and diagnostics deal with that reservoir and valve hardware, and its coverage of the two six-cylinder and three turbocharged diesels handles the rest of the truck.
SECONDARY SERVICE RESERVOIR AIR CHECK VALVES MAY NOT SEAT PROPERLY DUE TO A MECHANICAL INTERFERENCE CONDITION BETWEEN A CIRCULAR BRASS GUIDE AND THE WALL OF A CYLINDRICAL FERRULE I
