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 TM 55-1905-223-24-1
SECTION IV. UNIT MAINTENANCE TROUBLESHOOTING
2-9. General. A thorough analysis of the problem is the key to successful troubleshooting. The more
information known about a problem, the faster and easier it can be solved. Most troubles are simple and easily
corrected, such as: low power, caused by loose throttle linkage or dirty fuel filters; and excessive lube oil
consumption, caused by leaking gaskets or connections. Always check the simplest, most obvious things first.
More often than not, the source of the problem will be found and fixed quickly that way.
2-10. Troubleshooting Steps . The following steps make up the troubleshooting process.
a. Determine all the facts by asking the following basic questions:
(1) What were the warning signs preceding the troubleshooting?
(2) What previous repair and maintenance work has been done?
(3) Has similar trouble occurred before?
(4) If the engine still runs, is it safe to continue running it to make further checks.
b. Relate the symptoms to the basic engine systems and components.
c. Consult the troubleshooting table (see paragraph 2-12).
d. Double-check your findings before starting any disassembly. Too often, engines are disassembled in
search of the cause of a certain complaint and all evidence is destroyed during disassembly operations.
Check again to be sure an easy solution to the problem has not been overlooked.
e.
After all the above considerations have been weighed and the problem has been identified, repair
thoroughly ensuring that the basic cause of the malfunctions has been corrected so that the same failure
will not reoccur. For example, the mechanical malfunction of "sticking in injector plungers" is corrected
by replacing the faulty injectors, but something caused the plungers to stick. The cause may be
improper injector adjustment, or more often, water in the fuel.
f.
Once repairs have been made, check engine operation thoroughly to be sure all aspects of the
malfunction have been cleared and the engine is operating normally.
2-19
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