TM-9-2815-200-35
ENGINE, WITH CONTAINER:TURBOSUPERCHARGED, DIESEL ,FUEL INJECTION ,90-DEGREE “V” TYPE, AIR - COOLED ,12 - CYLINDER , ASSEMBLY ;MODELS AVDS-1790-2M (2815-856-4996), AVDS-1790-2A AND AVDS-1790-2AM (2815-856-9005)
TECHNICAL MANUAL; DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
TM-9-2815-200-35 - Page 71 of 779
CHAPTER 3
TROUBLESHOOTING
Section I. GENERAL
3-1. Purpose of Troubleshooting
Note.
Information in this chapter is for use of
Direct Support and General Support main-
tenance personnel in conjunction with and as a
supplement to the troubleshooting section in the
pertinent organizational manual (refer to Ap-
pendix A). It provides the instructions where a
remedy in
the organizational
maintenance
manual
refers
to supporting
maintenance
personnel for corrective action.
a. Prevent Damage.
Operation of a deadlined
vehicle without a preliminary examination can
cause further damage to the engine and possible
injury to personnel. By careful inspection and
troubleshooting, such damage and injury can be
avoided. In addition, the cause of faulty
operation can often be determined without
extensive disassembly.
b. Precautions by Inspection.
Most of the
inspections are visual inspection and are to be
perform ed before attempting to operate the
vehicle. These inspections are mainly to
determine the condition and to take precautions
to prevent further damage.
c.
Troubleshooting
While Mounted.
The
troubleshooting performed while the engine is
mounted in the vehicle is that which is beyond
the normal scope of the using organization.
Check the troubleshooting section of the per-
tinent organizational manual, then proceed as
outlined in this chapter.
d. Troubleshooting Engine only.
If the engine
only is received, inspection should be performed
to verify the diagnosis made while the engine was
installed in the vehicle. This inspection, to
uncover further defects or to determine
malfunction, is important as it is the only means
for determining the trouble without completely
disassembling the engine.
3-2.
General Instructions
Note.
This chapter contains inspection and
troubleshooting procedures to be performed
while a malfunctioning engine is still mounted in
the vehicle and after it has been removed.
a.
Visual inspections made while the engine is
mounted in the vehicle are performed before
attempting to operate the vehicle to avoid
damage or injury as well as to determine the
cause of the malfunctioning engine.
b.
Troubleshooting performed while the
engine is installed in the vehicle beyond the scope
of the using organization, is performed to
determine if the malfunction can be remedied
without removing the engine from the vehicle,
and, when subsequent removal is necessary, to
indicate when repair can be made without
complete engine disassembly.
c.
Troubleshooting a malfunctioning engine
after it has been removed from the vehicle
consists of
subjecting
it
to
tests
on
a
dynamometer. This chapter discusses those
symptoms which can be diagnosed by using
testing equipment, interprets results in terms of
probable causes, and recommends appropriate
corrective action.
d.
Tests and adjustments prescribed for an
engine after assembly (para 8-5) may be applied
to the engine in
which the malfunction is
suspected. Particular attention should be given
to proper oil level, fuel pressures and proper
adjustments when operating the engine to
determine appropriate corrective action to be
taken for the malfunction.
Section II. TROUBLESHOOTING PROCEDURES
3-3. General
refer to pertinent manuals listed in paragraph 1-
Most engine troubles are actually engine
24. The procedures
for troubleshooting the
accessory troubles. The troubleshooting portion
engine assembly and the accessory systems are
of pertinent
organizational maintenance
listed in paragraphs 3-4 through 3-11. Engine
manuals, normally, will cover troubleshooting of
malfunctions are referenced to the appropriate
all engine accessories while mounted on the
accessory system for corrective action, when
engine.
For complete coverage of accessories,
applicable.
3-1
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