62
Starting failure
Insufficient
engine output
Poor
exhaust
color
Hunting
Lubricating oil
Cooling
water
Air
intake
Engine starts
but stops
soon.
Exhaust
color
During
work
Exhaust
smoke
Trouble symptom
Cause
Engine
doe
s n
o
t start.
N
one
Littl
e
Muc
h
Ord
in
a
ry
White
Blac
k
White
Blac
k
H
igh knocking sound during
combustion
Abnorm
al e
n
gi
ne
soun
d
U
neven
co
mb
usti
on
sou
n
d
Du
ri
n
g
id
lin
g
Du
ri
n
g
wo
rk
Large eng
ine vibr
atio
n
Diffic
u
lty in
retur
n
in
g to
low s
pee
d
E
xc
es
si
ve f
u
el
co
n
su
m
pt
io
n
E
xce
ss
ive
co
nsu
m
pt
ion
Diluti
on b
y fu
el o
il
M
ixtu
re
wi
th
wa
te
r
Low
L.O
. pr
es
sure
Muc
h
bl
ow
-by
ga
s
O
verheat
Low
w
a
ter t
e
m
p
erat
ure
Press
u
re dr
op
Pres
su
re ri
se
Exhau
st t
e
mp
eratur
e ri
se
Corrective action
Excessive cooling effect of radiator
Defective thermostat (kept closed) (See 2.2.7 in Chapter2.)
Insufficient cooling effect of radiator
Defective thermostat (kept opened)(See 2.2.7 in Chapter2.)
or slipping fan belt (See 2.2.2-2) in Chapter2.)
Insufficient cooling water level
Check water leakage from cooling water system.
(See 2.2.1-4) in Chapter2.)
Cracked water jacket
Repair or replace.
Slackened fan belt
Adjust the belt tension. (See 2.2.2-2) in Chapter2.)
Defective thermostat
Check or replace. (See 2.2.7 in Chapter2.)
C
oolin
g Wat
e
r Sy
ste
m
Improper properties of lubricating oil
Use proper lubricating oil. (See 1.3.2 in Chapter1.)
Leakage from lubricating oil piping system
Repair.
Insufficient delivery capacity of trochoid pump
Check and repair. (See 5.5 in Chapter5.)
Clogged lubricating oil filter
Clean or replace.
Defective pressure regulating valve
Clean, adjust or replace.
Insufficient lubricating oil level
Add proper lubricating oil. (See 2.2.1-3) in Chapter2.)
Lubri
cati
ng S
yst
em
Too early timing of fuel injection pump
Check and adjust. (See 2.2.7-4) in Chapter2.)
Too late timing of fuel injection pump
Check and adjust. (See 2.2.7-4) in Chapter2.)
Improper properties of fuel oil
Use proper fuel oil. (See 1.3.1 in Chapter1.)
Water entrance in fuel system
Perform draining from the fuel filter. (See 2.2.3 and 2.2.5 in Chapter2.)
Clogged fuel filter
Clean or replace. (See 2.2.5 in Chapter2.)
Air entrance in fuel system
Perform air bleeding. (See 2.2.3 in Chapter2.)
Clogged or cracked fuel pipe
Clean or replace.
Insufficient fuel supply to fuel injection pump
Check the fuel tank cock, fuel filter, fuel pipe, and fuel feed pump.
Uneven injection volume of fuel injection pump
Check and adjust.
Excessive fuel injection volume
Check and adjust.
Poor spray pattern from fuel injection nozzle
Check and adjust. (See 2.2.6 in Chapter2.)
Priming failure
Foreign matter trapped in the valve inside the priming pump.
(Disassemble and clean.)
Clogged strainer at feed pump inlet
Clean the strainer.
Fuel sy
ste
m
