TM 5-3895-383-24
2.
Check the fuel lines for fuel leakage. Be sure the fuel
supply line does not have a restriction or a bad bend.
3.
Install a new secondary fuel filter. Clean screen (6)
located in the inlet fitting of the fuel transfer pump.
4.
Inspect the orifice in tube assembly (1) to see that there
is no restriction for proper operation.
Fuel System (Type II)
Fuel System (Type II)
(1) Fuel outlet port (to tank). (2) Tube assembly (return to tank
from fuel passage in cylinder head). (3) Tube assembly (from
transfer pump to fuel filter base). (4) Tube assembly (from fuel
filter base to fuel passage in cylinder head). (5) Fuel inlet port
(to fuel transfer pump). (6) Screen. (7) Pressure relief valve.
(8) Fuel filter.
1.
Check the fuel level in the fuel tank. Look at the cap for
the fuel tank to make sure the vent is not filled with dirt.
2.
Check the fuel lines for fuel leakage. Be sure the fuel
supply line does not have a restriction or a bad bend.
3.
Install a new secondary fuel filter. Clean screen (6)
located in the inlet fitting of the fuel transfer pump.
4.
Inspect the orifice in tube assembly (1) to see that there
is no restriction for proper operation.
Checking Engine Cylinders Separately
Tools Needed
1U8865
Infrared Thermometer
1
Temperature of an exhaust manifold port, when the engine
runs a low idle speed, can be an indication of the condition of a
fuel injector. Low temperature at an exhaust manifold port is
an indication of no fuel to the cylinder. This can possibly be an
indication of an inoperative injector. Extra high temperature at
an exhaust manifold port can be an indication of too much fuel
to the cylinder, caused by a malfunctioning injector. The
difference between cylinders should be no more than 70 C
(158F).
With the valve cover removed and the engine idling, the control
shaft levers allow each injector to be actuated individually to
the "FUEL ON" position for a few seconds. This causes
excess fuel to be injected into that particular cylinder, causing
a loud combustion "knock". If actuating an injector in this
fashion briefly does not result in a loud combustion "knock",
there may be a problem with the injector, the fuel supply to the
injector, or the seal between the injector and the brass sleeve.
Use the 1U8865 Infrared Thermometer to check exhaust
temperature. The Operator's Manual, NEHS0510, for the
1U8865 Infrared Thermometer gives complete operating and
maintenance instructions for this tool.
Injector Inspection
Tools Needed
1U6661
Pop (Injector) Tester
1
Testing of the injectors must be done off of the engine. Use
1U6661 Pop (Injector) Tester or [6V4022 Injector Tester with
1U6667 Conversion Group], and a 1U6662 Injector Holding
Block, to test the injectors. For the 6V4022 Injector Tester,
refer to Special Instruction, SEHS8858 for the test procedure.
For the 1U6661 Pop (Injector) Tester, refer to Special
Instruction, SEHS8867.
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