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 TROUBLESHOOTING
Section I. GENERAL
possible, what is wrong with the defective
46. PURPOSE
engine.
Note. Information in this chapter is for use
b. Troubleshooting performed while the en-
of maintenance personnel in conjunction with and
gine is mounted in the vehicle is beyond the
as a supplement to the troubleshooting section
normal scope of the using organization. Check
of the pertinent organizational maintenance
the troubleshooting section of TM 9-2320-235-20,
manual. It provides the continuation of instruc-
then proceed as outlined in this chapter. These
tions where a remedy in the organizational
troubleshooting operations are used to deter-
maintenance manual refers to higher echelon
mine if the fault can be remedied without re-
maintenance personnel for the corrective action.
moving the engine from the vehicle and, also,
when subsequent removal is necessary, to indi-
cate when repair can be made without complete
Operation of a deadlined vehicle without a
disassembly of engine.
preliminary examination can cause further dam-
age to a disabled component and possible injury
to personnel. By careful inspection and trouble-
c. Inspection after the engine is removed
shooting, such damage and injury can be avoided,
from the vehicle is performed to verify the
and in addition, the causes of faulty operation of
diagnosis made while the engine was mounted
a vehicle or component can often be determined
in the vehicle, to uncover further defects, or
without extensive disassembly.
to determine faults if the engine alone is re-
ceived by the maintenance establishment. This
inspection is particularly important in the last
case because it is often the only means of
determining the trouble without completely dis-
assembling the engine.
This chapter contains inspection and trouble-
shooting procedures to be performed while a
disabled engine is still mounted in the vehicle
d. Troubleshooting a disabled engine after it
and after it has been removed.
hasbeen removed from the vehicle consists of
subjecting it to tests on a dynamometer. This
a. The inspections made while the engine is
chapter discusses those symptoms which can be
mounted in the vehicle are for the most part
diagnosed by using the testing equipment, inter-
visual and are to be performed before attempting
prets the results in terms of probable causes,
to operate the vehicle. The object of these in-
and recommends the appropriate corrective
spections is to avoid possible damage or injury
action.
and also to determine the condition of and, when
Section II. TROUBLESHOOTING PROCEDURES
48. GENERAL
complete coverage of accessories refer to per-
tinent manuals listed in paragraph 1h. The pro-
cedures for troubleshooting the engine assembly,
Most engine troubles are actually engine ac-
engine accessories, and engine systems are
cessory troubles. The troubleshooting portion of
listed in paragraphs 49 through 56. Malfunctions
pertinent organizational maintenance manuals,
of the engine assembly are referenced to the
normally will cover troubleshooting of all engine
appropriate accessory system for corrective
accessories while mounted on the engine. For
action when applicable.
34
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