Table 2-1. Mechanical Troubleshooting (Cont)
TEST OR INSPECTION
Remove and inspect hydraulic valve lifters. (See paragraph 3-9)
Remove valves and inspect valve guides. (See paragraph 3-8)
Remove and inspect camshaft. (See paragraph 3-1 2)
RAPPlNG SOUND FROM ONE OR MORE CYLINDERS
Check fuel injector pump timing. (See paragraph 3-44)
Start engine, Loosen fuel injector line fitting at any fuel injector nozzle until fuel starts
to come from fitting.
If there is no engine rpm drop, test fuel injector nozzle, (See paragraph 3-36)
If there is engine rpm drop, tighten fitting to 20 Ib, -ft. (27 N.m) with crowfoot
attachment J-29698-A and repeat check for each fuel injector nozzle.
Remove engine oil pan. (See TM 9-2320-289-20) Check clearance between
connecting rod bearing caps. (See paragraph 3-1 3)
36. WILL NOT SHUT OFF USING KEY
Use extreme caution to ensure that clothing or tools DO NOT get caught in
trucks operating drivebelts. Failure to follow this warning may result in
serious injury to personnel or equipment damage.
With engine at idle, pinch flexible part of fuel return line at fuel injector pump to stop
Disconnect pink lead from fuel injector pump fuel shutoff solenoid. Turn key to
RUN position. Touch pink lead to fuel injector pump terminal and listen for clicking
If clicking sound is not heard, remove governor cover. (See paragraph 3-38)
Connect 12 volt power source to shutoff solenoid terminal and ground.
Observe shutoff solenoid plunger for freedom of movement. Clean or replace
shutoff solenoid if plunger sticks.
If clicking sound is heard, perform step 3.
Remove governor cover. (See paragraph 3-38) Operate throttle shaft and observe
governor assembly and metering valve for binding.
If there is binding, remove governor assembly and metering valve. (See
paragraph 3-39) Replace any damaged components. Clean metering valve
with calibration fluid. (Item 13, Appendix B) Reinstall governor assembly and
metering valve. If binding continues, replace metering valve.
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