1990 Ford LTS9000 Service and Repair Manual
This factory service and repair manual for the 1990 Ford LTS9000 documents five diesel engines in the medium conventional tractor and straight truck, both Base trim. Two of them, the 10.5L and 10.3L six-cylinders, are listed without turbochargers; the other three, the 10.0L, 14.0L and 14.6L inline-sixes, are turbocharged. Close displacements across that list make it easy to reach for the wrong figure, which is why the specifications, torque values, wiring diagrams and diagnostics here are indexed engine by engine.
Engines covered
- 10.5L six-cylinder (638 cu in) — diesel
- 10.0L inline-six (611 cu in) — turbocharged, diesel
- 14.0L inline-six (855 cu in) — turbocharged, diesel
- 14.6L inline-six (893 cu in) — turbocharged, diesel
- 10.3L six-cylinder (629 cu in) — diesel
Body styles covered
- Tractor truck, medium conventional
- Straight truck, medium conventional
Trims covered
- Base
Known issues on the 1990 LTS9000. This model year carries one recall on the federal record, covering secondary service reservoir air check valves that may not seat correctly because of mechanical interference between a circular brass guide and a cylindrical ferrule wall. Owners have registered no complaints about it with NHTSA. The air supply side of the brake system is well within what this manual documents, and its procedures, specifications and diagnostics are the place to start when reservoir pressure behaves oddly.
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
