TM 5-3895-382-24
The adjustment for high idle must be made only under
conditions with no load on the engine. The high idle
rpm is found on the data plate on the side of the fuel
injection pump.
Run
the
engine
until
the
normal
operating
temperature is reached. Then check the maximum
high idle. Use the high idle adjustment screw (2) in
order to adjust the high idle. Loosen the locknut.
Turn the screw in a clockwise direction in order to
increase
the
rpm.
Turn
the
screw
in
a
counterclockwise direction in order to decrease the
rpm. When the correct rpm is reached, tighten the
locknut Then, seal the screw.
b.
Tamper Prevention High Idle On Type 2 Engines and
7BJ Engines.
NOTE:
For a complete description of Type 1 and Type 2
engines, please refer to the Systems Operation,
Testing and Adjusting Module, "Engine Design"
for more information.
High idle has been preset at the factory. The setting
of the high idle of these engines should not be
adjusted. Adjusting the high idle setting can void the
following items: fuel injection pump warranty, engine
warranty and emissions standards. A seal is installed
on the high idle screw (2) in order to help prevent
tampering. Adjustment of the high idle should be
made only by personnel that have the correct training.
Run the engine until normal operating temperature is
reached. Check the maximum high idle. High idle
must be checked under conditions with no load on the
engine. The high idle rpm is listed on the data plate
which is located on the side of the fuel injection pump.
NOTE:
The correct rpm for low idle is given in the
following
publications:
Technical
Marketing
Information (TMI) and Fuel Setting And Related
Information Fiche.
Fuel Injector Nozzle Tests
Fuel Injector Nozzle Tests On Type I
Engines and 9RM Engines
NOTE:
For a complete description of Type 1 and Type 2
engines, refer to the Systems Operation, Testing
and Adjusting Module, "Engine Design” for more
information.
Table 10
Tools Needed
5P-4150
Tester Group
1
5P-7448
Adapter
1
6V-2170
Tube Assembly
1
8S-2245
Cleaning Tool Group
1
8S-2270
Fuel Collector
1
1U-8857
Extension
1
6V-6068
SAE J-967 Calibration
1
Fluid
Perform the following procedure in order to identify the fuel
injector nozzles which do not operate correctly:
Illustration 50
Fuel injector nozzles and lines.
(5) Nuts for the fuel injection lines
1.
Run the engine at low idle.
2.
Loosen the nut of the fuel injection line (5) at each fuel
injector nozzle. Listen for the low idle to decrease or
become rough at each cylinder.
3.
The fuel injector nozzle has a defect when the nut of the
fuel injection line (5) is loosened and the following items
do not occur idle decreases and rough idle. Remove
the fuel injector nozzle for additional testing.
NOTE:
If leakage at the nut of the fuel line occurs, make
sure that the fuel line and the nut are correctly
aligned with the inlet connection of the fuel
injector nozzle. Do not tighten the nuts on the
high
pressure
fuel
lines
more
than
the
recommended torque. If the nut is tightened
more, the fuel line may be restricted or the
threads of the fuel injector nozzle and the nut may
be damaged.
6-62
