1989 Ford LN9000 Service and Repair Manual
This factory service and repair manual for the 1989 Ford LN9000 covers four diesel engines: a 10.5L six-cylinder (638 cu in) and three turbocharged inline-sixes, the 10.0L (611 cu in), the 14.6L (893 cu in) and the 14.0L (855 cu in). The truck was built as a short-conventional tractor or a short-conventional straight truck, and Base is the only trim on record. The 10.5L is the one engine here listed without a turbocharger, so its specifications, torque values and diagnostics stand apart from the three turbocharged sixes in the manual.
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
Body styles covered
- Tractor truck, short conventional
- Straight truck, short conventional
Trims covered
- Base
Known issues on the 1989 LN9000. One recall is on federal record for the 1989 LN9000. It concerns the secondary service reservoir air check valves in the air brake system, which may not seat properly because of a mechanical interference between a circular brass guide and the wall of a cylindrical ferrule. No owner complaints are logged with NHTSA against the 1989 LN9000. The air brake control procedures, specifications and diagnostics in this manual cover the check valves and reservoirs that recall points to, alongside the four diesel engines.
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
