Yanmar 3TNV88F, Service Manual

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FAILURE DIAGNOSTIC LIS
T
3T
NV88F Service Manual
14
-9
Failure Diagnostic List
3T
NV8
8
F Ser
v
ice Ma
n
u
a
l
FAILURE DIAGNOSTIC LIST
Failure Diagnostic List
Sympto
ms and
conditions of failures
Cause
Defectiv
e start
Engin
e stall
after star
t
De
fective rotation control
Insufficient
e
ngine
output
Noise/vibration
L
ubrican
t
Coolin
g
water
Intake
Exh
aust
F
uel
Electrics/electronics
Acti
on
R
eferenced pag
e number
Sta
rt
e
r not
rotat
e
Starter ro
tates
Exhaust
fume
Speed change by accelerator n ot available (constant sp eed)
Without load
At w
o
rk
Exhaust colo
r
Knocking noise at combustion too high
Combus tion noise uneven
Noise other than co mbustion from engine
Engine vibration too big
Lubricant consumption too much
Lubricant diluted with fuel
Lubricant mixed wit h water
Oil pres sure too low (oil pressure lamp on)
Overheated (water temperature lamp on)
Water temperature too low
Pressure down (air cleaner lamp on)
Pressur e up
At work
Blow-by too much
Exhaust temperatu re up
Fuel consumption too much
Fuel mixed with water (oil -water separator lamp on )
Fuel filter contaminated too ea rly
Battery charge defect (charge lamp on)
ECU indicator lamp flashing
ECU indicator lamp not on just after key-on (2 seconds)
Prescribed ECU control func tion not operate
Fuse meltdown , disconnection (repe ated)
ECU indicator lamp not on just after key-on
ECU indicator lamp on just after key-on (2 seconds)
Engine not start (not even initial combustion)
Engine not start (stall after serial combustion)
Engine starts later then e ver
None
Little
Much
Specified speed setting not available
Poor acceleration
Return to low speed not smooth
Hunting
Hunting
Norm al
White
Black
White exhaust color
Black exhaust color
Engine system
In
take/e
xhaust valve clearance
incor
rec
t





Val
v
e
clea
rance
adju
s
tment
See
Mea
s
u
ring an
d
A
d
just
ing Val
v
e
Cleara
n
ce
on page
6-
30
C
ompression fa
ilure at valve
seat








V
a
lv
e se
a
t
fa
ci
ng
See
Va
lve f
a
ce
and
valve
seat
o
n
page
6
-24
.
In
take/e
xhaust valve seizure










Corre
ct
ion
or
r
eplaceme
nt
of
int
a
ke/
e
xhaust
val
v
e
See
Removal
of
int
ake/e
xh
aust valves
o
n
page
6
-20
.
C
y
lin
der head
gasket blow-out


G
a
ske
t re
p
lac
em
en
t
See
Removal
of
cyli
nder he
ad on
page
6
-19
.
Piston ring sticking or brea
kage










Pist
on ring
re
placemen
t
S
e
e R
e
as
se
m
b
ly
o
f
pi
st
o
n
s
o
n
page
6
-47
.
Wear of piston
ring, piston o
r cylin
der






Honin
g
work
and u
s
a
ge o
f
over-sized
part
s
See
Hon
ing and Bo
ring on
pa
ge
6-46
.
Seizure of cra
nk pin metal or
bearing
pa
rts






Repai
r o
r r
epla
c
e
m
ent
See
I
nspect
ion of
cra
nksh
aft
on
page
6
-44
.
C
losed gap
position fault of piston rin
g



Corre
ct
ion
of
cl
osed gap po
sit
ion
S
e
e R
e
as
se
m
b
ly
o
f
pi
st
o
n
s
o
n
page
6
-47
.
R
everse
assembling
of piston ring



Corre
ct
ion
of
asse
mbling
S
e
e R
e
as
se
m
b
ly
o
f
pi
st
o
n
s
o
n
page
6
-47
.
Wear of crank pin metal and journal me
tal





Measure
m
ent
a
nd
repl
acement
See
I
nspect
ion of
cra
nksh
aft
on
page
6
-44
.
C
onnecting
rod bolt loose


Tight
eni
ng at specif
ied t
o
rqu
e
See
Torq
ue
fo
r B
o
lt
s an
d Nu
ts
on
page
6
-10
.
F
oreign materia
l entered into
combustion ch
amber



Disasse
mbling
an
d
repai
r
See
Disassembly
of
En
gine on
page
6
-33
.
Gear backlash
too big

G
e
ar
m
e
s
h
ad
ju
stm
e
n
t
See
Che
c
king
t
iming
ge
ar backlash on
page
6
-34
.
Wear
of intake
/exha
ust valve g
uide


Measure
m
ent
a
nd
repl
acement
See
I
n
spect
ion of
valve gu
ides on
page
6
-23
.
Open/close
timing failure of
intake/exhaust valve





Val
v
e
clea
rance
adju
s
tment
See
Mea
s
u
ring an
d
A
d
just
ing Val
v
e
Cleara
n
ce
on page
6-
30
.
Engine vibration isolating su
pport
loose, damage



Repai
r o
r r
epla
c
e
m
ent
of
fa
ult
y
par
ts
3TNV
88F_
SVM_
A4.b
ook
9 ペ
ージ
２
０１
２年
７月
２６
日 木
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