Section II. TROUBLESHOOTING - TM-9-2910-226-340043

TM 9-2910-226-34

Table 2-1. Special Tools

Section Il. TROUBLESHOOTING

2-6. Purpose. a. Information in this section is for

because it is often the onlv means of determining the

use of maintenance personnel in conjunction with,

malfunction without disassembling the fuel injection

pump.

and as a supplement to the troubleshooting sections

in the pertinent vehicle and engine technical

Troubleshooting a disabled fuel injection

pump after it has been removed from the vehicle

manuals. It provides continuation of instructions

and/or engine consists of subjecting it co tests on a

where a remedy in the above technical manuals refers

to maintenance personnel for corrective action.

suitable test stand. This section discusses those

symptoms which can be diagnosed by using the

b. Operation of a deadlined vehicle without a

testing equipment and interprets the results in terms

preliminary examination can cause further damage

of probable causes. Information pertaining to this

to a disabled fuel injection pump and possible injury

test is contained in paragraphs 3-49 through 3-52.

t o personnel. B y careful inspection and

troubleshooting, such damage and injury can be

2-8. Procedures. After a metering and distributing

avoided and, in addition, the cause of faulty

fuel injection pump has been received by the

operation of a vehicle or fuel injection pump can

maintenance activity for preliminary inspect ion, or if

often be determined without extensive disassembly.

performance of the pump has been unsatisfactory

2-7. General Instructions and Procedure. This

due to unknown causes, it must be checked before

section contains inspection and troubleshooting

installing it on a test stand. This check should in-

procedures to be performed after a fuel injection

clude a search for any binding or broken parts by

pump has been removed from the vehicle and/or

rotating camshaft and operating lever. When cause

power plant.

for failure has been found, fuel injection pump

a. Inspection after the fuel injection pump is

should be disassembled and repaired before

removed from the vehicle and/or engine is performed

proceeding with the tests. Additional operational

to verify any diagnosis made when the pump was in

tests performed on a damaged fuel injection pump

the vehicle, to uncover further defects, or to

could only increase the damage. If no cause for

determine any malfunction if the component alone is

failure is found in inspection, fuel injection pump

received by the maintenance activity. This in-

should be put on test stand and troubleshooting

spection is particularly important in the last case

performed.

2-3