Service manual
ENGINE
TROUBLESHOOTING
PROBLEM
PROBABLE
CAUSE
KNOCKING
ENGINE
KNOCKS
WITHOUT
MUCH
SMOKE
!
1.
Main
engine
troubles.
a.
Overheated
cylinder.
'
b.
Carbon
deposits
in
cylinder.
I
2.
Too
early
injection
timing.
I
3.
Too
high
injection
pressure.
I
I
4.
Improper
fuel.
KNOCKING
WITH
DARK
SMOKE
1.
Poor
compression.
2.
Injection
pump
malfunctioning.
a.
Worn
plunger.
b.
Pinion
is
not
in
mesh
with
control
rack.
c.
Broken
delivery
valve
spring.
d.
Worn
delivery
valve
seat.
3.
Improper
nozzle.
a.
Poor
spray.
b.
Poor
chattering.
c.
After-injection
drip.
d.
Nozzle
needle
valve
seized.
INTERMITTENT
1.
Fuel
filter
clogged.
EXHAUST
SOUND
2.
Fuel
pipe
sucks
air.
3.
Water
mixed
in
fuel
OVERHEATING
1.
V-belt
slackening
or
slippery
with
oil.
2.
Damaged
water
pump.
3.
Lack
of
coolant.
4.
Low
oil
level
or
poor
oil
quality.
5.
Knocking.
6.
Moving
parts
seized
or
damaged.
7.
Defective
thermostat.
LOW
OIL
PRESSURE
1.
Worn
Bearings.
2.
Relief
valve
malfunction.
3.
Clogged
oil
cooler.
4.
Diesel
dilution
of
the
oil.
NOTE:
Refer
to
the Table
of
Contents
for
testing
and
adjustment
procedures
for
the following:
Valve Clearance
Injection Timing
Oil Pressure
Engine Compression
7
VERIFICATION/REMEDY
a.
See
OVERHEATING;
LOW
OUTPUT.
b.
Clean.
2.
Correct.
3.
Correct.
4.
Replace
with
proper
fuel.
1.
See
LOW
COMPRESSION;
HARD
STARTING.
a.
Replace.
b.
Correct.
c.
Replace.
d.
Replace.
a.
Clean
or
replace
nozzle.
b.
Repair
or
replace
nozzle.
c.
Repair
or
replace
nozzle.
d.
Replace.
1.
Clean
or
replace.
2.
Retighten
pipe
joints
or
replace
pipe.
3.
Replace
fuel.
1.
Adjust,
replace
or
clean.
2.
Replace.
3.
Add.
4.
Add
or
change.
5.
See
KNOCKING.
6.
Replace.
7.
Replace.
1.
Engine
overhaul
replace
bearings.
2.
Overhaul
oil
pump.
3.
Repair.
4.
Injection
pump
repair.