Testing and Adjusting Section
SMCS Code: 1000
For a complete description of Type 1 and Type 2
engines, refer to the Systems Operation, Testing
and Adjusting Module, "Engine Design" for more
Troubleshooting can be difficult. The most common problems
are identified in this troubleshooting manual. The symptoms,
causes, and guidance for solving the problems are given.
Sometimes additional repair work is required beyond the repair
which is recommended. Frequently, a problem does not exist
in isolation. The problem can be a result of wear or damage to
several parts which operate together as part of a system.
All possible problems and the probable causes cannot be
listed. The serviceman must follow a logical process of
eliminating possible causes and identifying the specific causes
of the problems.
Troubleshooting The Fuel Injector Nozzles On The
Be careful when you are handling the fuel injector
nozzles in order to prevent damage to the orifices,
threads, and other surfaces. When a fuel injector
nozzle is installed, make sure that all surfaces and
threads are clean.
The procedures which require disassembly or the adjustment
of the fuel injector nozzle only relate to the following engines:
Type 1 Engines and 9RM Engines
Do not disassemble the fuel injector nozzles and do not adjust
the fuel injector nozzles on the following engines:
Type 2 Engines and 7BJ Engines
Replace the fuel injector nozzle on Type 2 engines and 7BJ
engines if the fuel injector nozzle does not operate correctly.
These fuel injector nozzles are not serviceable parts.
Refer to Specifications, "Fuel Injection Nozzles" for additional
The engine is difficult to start. If the engine starts, the
engine runs rough.
The fuel injector nozzle does not seal correctly in the
Make sure that the seals and the mating surface of the
cylinder head are clean. The seal that is formed by the
anti-seize compound on the threads of the fuel injector
nozzle may be broken. Make sure that the fuel injector
nozzle is tightened to the correct torque in the threaded
hole of the cylinder head.
Extra seat washers were not removed from the threaded
recess in the cylinder head for the fuel injector nozzle.
Debris exists on the mating surface of the cylinder head
with the seat washer.
Remove any extra seat washer or debris.
The connections of the high pressure fuel line leak.
Tighten the fittings of the high pressure fuel line.
The fuel injector nozzle does not operate correctly.
This step does not include Type 2 engines and
7BJ engines. The fuel injector nozzles for these
engine serial numbers are not serviceable.
Adjustment of these fuel injector nozzles should
not be made. If any problems with the internal
components of these fuel injector nozzles exist,
the fuel injector nozzle should be replaced.
Make sure that the mounting bolts for the clamp and the
components of the fuel injector nozzle are tightened to the
correct torques. Make sure that the seal and the spacer are
positioned correctly. Test the fuel injector nozzle on a nozzle
The incorrect fuel injector nozzle is installed.
Make sure that all fuel injector nozzles have the correct
Specifications, "Fuel Injection Nozzles".