Chapter 9 TROUBLESHOOTING
9-3
Troubleshooting
Engine Turns, But It Does Not Start
Table 9-2 Engine turns, but it does not start (1 / 2)
Problem Cause Remedy
A
Engine emits
hardly any
exhaust smoke.
(1) No fuel supplied to fuel injection pump
a Air trapped in fuel supply system
Bleed air from fuel filter and fuel feed
pipes, and inspect each part for damage
and air leaks. Disassemble and repair, if
necessary.
b Empty daily fuel tank Add fuel.
c Clogged fuel filter
Disassemble and clean, or replace ele-
ment.
d Clogged fuel feed pipe Clean inside of pipe.
e Fuel not supplied due to malfunction of
fuel feed pump or drive unit
Disassemble and inspect, or replace fuel
feed pump or drive unit.
(2) Fuel supplied to fuel injection pumps
a Loose fuel injection pipe If loosened, tighten.
b Seized or damaged parts in fuel injection
pump
Malfunction of fuel lever
Control rack does not move
Inspect control link. If there is a fuel lever
linkage problem, disassemble and repair.
Remove cam chamber cover, and operate
by hand. If parts are defective, disassem-
ble and repair, or replace.
c Seized plunger Replace, if defective.
d Clogged two-way delivery valve
Inspect two-way delivery valve, and disas-
semble and clean.
e Broken plunger spring
Disassemble and repair, or replace if
defective.
B
Engine emits
small amount of
exhaust smoke.
(Check the
cause of insuffi-
cient injected
fuel.
Check all items
in A-(1) and (2)-
b, and also
check items at
right.)
a Fuel lever does not open fully
Check relation of movement with fuel
lever, and disassemble and repair if defec-
tive.
b Seized tappet in fuel injection pump
Check for uneven movement, and disas-
semble and repair, or replace.
c Worn tappet roller or camshaft in fuel
injection pump (reduced amount of
injected fuel)
Replace, if worn.
d Seized or worn plunger in fuel injection
pump, worn broken plunger spring
(reduced amount of injected fuel)
Check for uneven movement, and disas-
semble and repair, or replace.
e Loose tightening screw of control rack of
fuel injection pump
Tighten screw.
f Defective oil sealing performance of
two-way delivery valve, or broken two-
way delivery valve spring
Disassemble and repair, or replace.
g Fuel viscosity too high to allow smooth
flow
Use fuel with viscousity suitable for ambi-
ent temperature. If fuel quality is improper,
change fuel.
h Large amount of fuel leaks from fuel
injection nozzles, and insufficient
injected fuel
Check leak-off pipe for amount of fuel
leaks, check with nozzle tester, and
replace defective parts if necessary.
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