Weifang 495 User manual
OPERATION
AND
MAINTENANtE
MANUAL
FOR
MODEL
495
DIESEL
ENGINE
Foreword
Model
495
diesel
is a
high
speed
engine
of
four-stroke,verti-
cal,
four
-
cylinder,
water
-
coolea,
swirl
combustion
chamber
type.
It
is
one
of
the
Chinese
designed
95
series
products.
It
pos-
sesses
the
advancec;llevel
of
its
dynamic
characteristic
and
fuel
eco-
nomics
,and
has
thd
proven
features
of
simple
construction,
relia-
bility,
versatility
to
the
maliti
-purpose
applications
and
higher
de-
gree
of.
standardization,
seriation
and
inter
-
changeability.
95
se-
ries
diesel
e~gine
was
prized
by
the
National
Science
Congress
in
1987.
In
recent
years
,
with
the
hell)
of
the
technology introducetl
from
Ricardo
Consulting
Engineers
pIc'
of
Great
Britain
and
the
ad-
vanced design'
features
of
Rseries,
the
design
of
Model 495 is modified
so
as
to
improve
its
dynamic
characteristic,
economic index and
it~
reli-
ability.
According
to
the
requirements
of
the
driven
equipments
,vari-
ous
versions
of
Model
495
diesel
engine
can
be
developed
by
modi-
fying
some
parts
and
components
relevantly
so
as
to
satisfy
the
different
applications,
such
as
tractors,
trucks,
construction
~a
chineries,
agricultural
drainage
and
irrigation
pumps,
agricultural
sideproducts
proce~sing
machineries,
marine
propulsion,
generator
set~
,well
drill~ng
machineries
and
so
on,
The
following
models
of
the
engine
are
av&ilable:
1.
Model
495 -
The
basic
version.
(,Its)
rated
power
is
taken
off
at
the
flywheel
end,
It
can
be
used
readily
as
a
prime
mover
'of
the
land
machinery.
2.
Model
495T-The
version
used
for
tractor.
Provided
with
a
fla.nged
cast
iron
oil
sump
and
a
connecting
plate
,it
is
used
to
pow-
er
wheel
tractor
of
model
50.
1
3.
Model
495G-The
version
for
stationary
use.
Provided
with
a
power
takt::-off
and
clutch,it
is Sllitable
for
driving
agricultural
drainage
aIld
irrigation
pump,
agricultural
sideproducts
processing
rpachil1:eries,
al1.d
other
stationary
equipments.
4.
Model
495Q
~The
~version
for
vt:hicle
use.
Its
ratecl
po\ver
is
of
70ps
at
2800rpm.
It
is
suitable
for
powering
trucks
of 2. 5-
3ton
c,a.p~ci
ty.
5.
Model
495K-
The
version
used
for
construction
machin-
.'
~
."
,"
('.
",
~ry"
It
can
be
served
as
the
..
prime
movers
of
vari<?us
c,onstruction
.'
.
machineries
sucll
as
loader
or
the
fork
lifter.
6.
Model
495D-The
version
used
for
generating
set.
It
serves
as
the
prime'
mover
of
the
20
kw
generator
set.
7.
Model
495ZD-The
tu~bocharged
versions.
It
is
used
as
the
prime
mover
of
the
30kw
generating
set.
In
order
to
keep
the
diesel
engine
ill
its
good
condition
to
work
normally,
~eliably
and
economically
as
well
as
p~olonging
its
ser-'
vice life
utmostly,
we
are
offering
this
manual
so
as
to'
help
the
users
to
master
the
operatiot;l
and
service
techniques
an~
to
run
the
diesel
engine
properly.
In
this
manual,
th,e
engine
mentioned
about
is
mainly
the
basic
version
of
model
495,
besides,
the
different
features
l:-,etyveen
the
basic
version
and
the
versions
for
stationary
and
tract9r
uses
are
also
described.,()therversions,
are
illustrated
in
Appendix
Manual.
The
engines
\-viII
be
modified
and
iInproved
from
'time
to
time,
therefore
the
users
are
adviced
to
see
that
the
produsts
supplied
hereafter
may
be
slightly
different
from
that
described
in.
this
man-
ual
which
of
course
shall
be
revised
periodically.,
Users
are
hoped
to
give
advice
on
this
man~aI
and' the,.
quality
,of
the
prodllcts,
also
to
introduce
t11e
advapced
experience
about
operation
and
maintenance
of
the
diesei
engine
to
our
works.
2
Important
Notice
1.
The
diesel
engine'
operators
must
familiarize
themselves
with
this
manual
and
the
engine
construction,
follow
strictly
the
procedures
of
operation
and
maintenance
especially
the
regulations
for
safety
operation
defined
in
this
manual.
2.
In
any
case
,must
keep
the
engine
,especially
the
fuel
system
clean
during
their
operation
adjustment
or
repairing.
3.
In
any
cas'e,
the
engine
should
not
be
filled
with
anyuilfil-
tered
fuel
or
lubricating
oil.
The
fuel
and
lubricating
oil
containers
must
be
kept
clean.
The
diesel
"fuel
should
be
settled
for
more
than
48
hrs
b'efore filled
into
fuel
tank.
The
grade"R
-,O"light
diesel
fu-
el
and
the
grade
"HCA
-14"lubricating
oil
of
china
should
be
used
in
summer.,
the
grade
10
light
diesel
fuel
and
grade
"HCA
-11
"lu-
bricating
oil
should
be
-used
in
winter,
and
the
grade
"HCA
- 8
"lu-
bricating
oil is
suitable
for
extremely
low
ambient
temperature.
4.
Increase
its
speed
gradually
after.
starting
a
cold
engine,
never
let
it
run
at
high
speed
abruptly,
and
dont
stop
the
engine
in-
,
stantly
while
its
cooling
water
is
still
too
hot.
5.
If
the
ambient
temperature
falls
below+5°~
,after
stopping
the
engine,
drain
the
cooling
water
out
of
the
radiator
and
the
diesel
engine
itself
completely
to
prevert
the
engine
from
cracking
due"
to
freeze.
6.
Never
run
the
diesel
engine
without
an
air
cleaner
so
as
.to
prevent
the
unfiltered
air
from
entering
the
cylinders.
,7.
The
inspection
and
repair
of
the
components
in
electrical
system
must
be
carried
out
by
the
person
who
has
a
good
knowl-
edge
of
electricity.
8.
The
Running
-in
period
is
necessary
for
a
new
or
an
just
overhauled
diesel
engine
before
the
engine
gets
into
the
normal
service.
It
is
prohibited
to
operate
the
engine
at
full
load
before
its
. .
runnIng-ln.
3
Contents
Right-Hand
Front
View
of
Model
495 Diesel
Engine.·(Fig·.
I")
Left-Hand
Back
View
of
Model
495 Diesel
Engine.
(.Fig.'2)
Right
-
Hand
Front
View
of
Model
495T
Diesel
Engine.
(Fig.
3)
Left~Hand
Back
View
of
Model
495T Diesel
Engin~(Fig.
4)
Right
~
Hand
Front
View
of
Model
4950
Diesel
Engine
(Fig~
5)
Longitudinal
and
Cross
Section
Drawings
of
Model
495
Diesel
Engine
<Fig._
6)
Longitudinal
and
Cross.
Sectional
Drawings
of
Model··
495T
Die~el
Engine
(Fig.
7)
Overall
and
Mounting
Dimensions of Model 495
Die~el
Engine
(Fig.
8)
Overall
and
Mounting
Dimeo'sions
of
Mbdel
495T
,l)iesel·En~
gine
(Fig.
9)
Overall.
a.nd
Mounting
Dimensions
of
Model
495G
Diesel
En-
gine(Fig.10)
Load
Characteristic
Curve
of
Model 495
Diesel
Engine
(Fig-
11)
Speed
Characteristic
Curve
of
Model
495
Diesel
Engine
<Fig.
12)
Chapter
I.
Main
Specifications
and
Technical'Data
of
The'
Diesel
Engines'
~.
Main
Specifica
tions
2~
Specifica
tions
of
Main
Accessories
3.
Tightening
Torques
of
Main
Bolts
and
Nuts
4
4.
Main
i\.djustment
Date'
5.
Clearances
and
Wear
Limits
of.Main:.Parts
Chapter
\11.
Main'Constr~ctions,;Adjustments
and
Mainte-
rta·nces'o:{'
the
DieselEngine~
1.
Cylinder
Block,.A'ssembly .
.2.
Cylinder
Head
Assembly,
Valve
gear
&.
Their
Maintenance
..
~
(,i',)Construct.lons.·a'nd'
·Features
(2)Inspecting
&.
L.apping
Valve
(3)
Reaming
&-
replacing
Val
ve Seat
(4)
Mounting
Cylinder
Head.
onto
Cylinder
Bloc'k
(5)
Adjus
ting
Decompr~ssors'Travel
(6)Mounting
Timing
Gears
~
.,
..
';3
..
'·~Gr·a·ri·ksh·aft
,~Con,necting
Rod
Mechanism
&.
Its
Mainte'-
nance
1
)Construction
&.
Fe-atures
2)Maintenance'
of
Crankshaft-Connecting
Rod'~lechanism
( 1)
Dismantling
&.
Inspecting
Crankshaft
-
Connecting:
Rod
Mechtnism
( 2 )
Repairing
&.
Installing
Crankshaft':"-
Connecting
Rod
Mechanism
4.
Sup_ply:
,SY'stem
1
)Construction
of
Main
Components
in
Supply
System
(1
)
Air
Cleaner
(2)Fuel
Feed
Pump
(3)Fuel
Filter
(4·)
Injection
Pump
and
Governor
(5)
Injector
2)Maintenance
of
The
Supply
System,
'(1
)Maintenance
of
Air,
.Cl~aner
5
6
(2)Maintenance
of
Fuel
System
A.
Maintenance
of
Fuel
Filter
B.
Calibration
of
the
Fuel
Delivery
Timing
C.
Inspection
and
Adjustment
of
Injection
Pump
and
Governor
D.
Inspection
and
Adjustment
of
·Injector.
5
•.
Lubricating
System
1
)Construction
of
Main
Components
in
Lubricating
System
(l)Lubricating
Oil
Pump
(2)Lubricating
Oil
Filter
(3)Centrifugal
type
Bypass
Oil
Filter
2)Maint
pnance
of
Lubricating
System
(1
)Notice
on
Maintenance
(2)Cleaning,
Inspection
and
Adjustment
of
The
Components
A.
Inspection
and
Adjustment
of
Lubricating
Oil
Pump
B.
Cleaning
of
Lubricating
Oil
Filter
C.
Cleaning
of
Centrifugal
type
By·pass
Oil
Filter
6.
Cooling
System
&.
Its
Maintenance
1
)Construction
and
Features
2)Maintenance
of
Cooling
System
7.
Electrical
Systenl
1
)Constru.ction
Features
of
the
Electrical
System
(l)Battery
(2)Generator
(3)Voltage
Regulator
and
Relay
Regulator
(4)Starting
Motor
(S)Preheater
(6)Key
Switch
(7)Preheater
and
Starting
Switch
2)Maintena~e
of
Electrical
System
(1
)Maip.tenaI?-ce
...
~f.
Bat~ery
(2)Maintenarlce
of
Generator
(3)
M·aintenancec;>.fSt~rting
M9tor
Chapte.r
:YJI
-
*l·:·an~pqr.ting",
Illstallipg
and··
U.np~cking
The
Diesel
Engine.
Chapter
\lIJI.
Test
Runnillg.a~4R:.~nning~in··q£.The
~Eng:ing
Chapter
IX.
EngineQ.per~ti9D:,
1.
Fuel,
I..;
u
brica
ting
Oil
and·~Go.oJing
Water
2.
Preparations
Before
Starting
Th,e
Engine:
3. Engil1e
Staring
4.
Operating
The
Engine
5.
Stopping
The
Engine
6.
Procedure
of
Safety
Operating
Chapter
X.
Preservation
and
Storage
of
The
Engine
Chapter
L.
Maintenance
of
The
Diesel
Engine
1.
Daily
Maintenance
2.
First
Order
Maintenance
3?
Second
Order
Maintenance
4.
Third
Order
Maintenance
5.
Fourth
Order
Maintenance
Chapter
C.
Engine
Troubles
and
Their
Remedies
1.
Engine
Fails
to
Start
2.
Unstea~dy
Running
of
The
Engine
3.
Insufficient
Engine
Output
4.
Abnormal
Exhaust
Smoke
5.
Unordinary
Noise
in
Engine
Operation
6.
Engine
Overheated
in
Operation
7.
Abnormal
Lubricating
Oil
Pressure
in
Main
Oil
Passage
8.
Engine
Running
Away
(Overspe~d
Suddenly)
7
8
Chapter
D.
Model
495G
Stationary
Diesel
Engine
1.
Constructional
Features
2.
Operation
&.
Maintenance
of
The
Clutch
Chapter
M.
Model
495T
Diesel
Engine
for
Tractor
1.
Constructional
Features
2.
Adjustment
and
Maintenance
Appendixes:
List
of
Rolling
Bearings
List
of
Oil
Seals
List
of
Water
Seals
Fig.1
Right-hand
,,~iew
of
model
495
Diesel
Engine
1
2
Fig.2
Left-hand
back
view
of
!Dodel
495
Diesel
Engine
gine
operation.
5).
The
dust
gathere~
on
the'
air
cleaner
should,tbeeleaned
away
every
day
if.
the
engine-operates
under
'dusty
~:conditioris.
2.
First
Order
lVlaintenance
~sides·t~e
work
of
daily
mainte.nance,
the
folloVving'
items
should·.b.e added:
1
).
Clean
the
air
cheaner
and
brush
off
the
dust.
on
thecouter
surface
'of
the
-paper:.filter
ele·mentwiih
a
soft
brush~·
.
2
).
Clean
the
Model
J:
08:10
lu:bricating·
oil
filter",tflush
and
brush
the
paper
filter
element
with
diesel
oil
and:a
brus·h.
3
).Cleanand.s
..
ervice.
the
centrifugal
tYP'ebypass
oil
filter
ev-
ery
150
operating
hours.
4)
·
Check
the
electrolyte
level
of·
the
battery
and·
see
the
venti-
latiori
hole.on
the. -coye.r 'of
the
battery
jsunblQcked.·Replenis_h·Jt~he
battery
.with di'stilled
-w&t~r
ifnec·e.ssary.
Wipe~cleari./thebattery
with
a
·piece.of
.clo,thand
smear._.
th~e
terminals
with.·~grease
to
pre~
vent
them
from
corrosion.
5).
Check
and
adjust
the
tension
of
the:fan·,belt.
6)
.
Fill
thewaler,pump
bearing
with
.grease.
3.
Second
Order
Maintenance
Besides
the
work
of
..
first
·order
mainterlance,
the
following
items
should, be
..
added:
I).·Replace
the
lubricating.
oil
in
-the
sump
,flush·
the
oil
sump·,
sump
strainer
and
trle
filter
screen
of
the
oil
filter.
2).
Clean'the~lubricating,
·oil·filter
or
replace
,the
paper
filter
el-
ement.
3)
~
Wash
the
air
cleaner
or
replace
the
filter
element.
4)
•
Wash
the,
fuel
filte~r·
or: replac'e
the
fil
ter
element.
S)
.Check~nd
.
adjust
the
valve
lash.·
and
"
the
.
d'ecompressor~·s
93
travel.
4.
Third
Order
Maintenance
Besides
the
work
of
second
order
maintenance,
the
following
items
should
be
added:
1),. Check
the
injection
pressure
and
nozzle
spray.
Wash
the
nozzle
assembly
and
readjust
the
injection
pressure
if
necessary.
Repalce
it
if
it
is
in
vain.
.
2).
Check
and
adjust
the
delivery
advan.ceangle
of
theinjec-
.
tion
pump
.artd
replace
the
lubricating
oil
in
it.
3).
Wash
the
fuel
tank
and
fuel
pipes.
4).
Check
the
connecting
rod
bolts
,maIn
bearing
nuts
and
cylinder
head
nuts
for
their
tightness.
-5).
Flush,
the
o'uter
surface
of
the
'batterywith'
hot·
water.
Check
the
specific
gravity
of
the
electrolyte
;it
should
be
within
1.
24-1'.
27
when
the
ambient
tempet'ature
is
of
I·SoC.
Replenish
the
battery
with
electrolyte
and
'charge:it_~ifthe
specific
gravity
is
low-
~"_~.
-,.
".
'.'
-~.:1;~':'::"'
...
-.,
er
than
1. 24.
5.
Fourth
Order
IvlainOtenance
Besides
the
work
cof'
third
order
maintenance,
the
following
items
should
be
added:
1
).
During
the
last
shift
before
the
engine
going
to
be
serviced
for
the
fourth
order
maintenance,
the
water
scale
in
the,
cooling
system
should
be
remo\red
first
and
the
cooling
system
should
be
washed
cleaning.
2).
Inspect
the
water
pump
for
leakage,replaceothe
water
seal
or
other
parts
if
necessary
and
renew
the
grease
in
the
bearing
oJ
the
water
pump.
3).
Dismantle
the
cylinder
head
,check
the
valves
for
gas
tight-
ness,
clean
off
the
deposited
carbon,
and
see
if
lapping
the
valves
94
and
reaming
the
valve-
seats
are
necessary
.
.
'.
"·4.).
Cleano.f£
tpe
deposited' carbon'
on
the:.upper
parts.of.~ylin
der' -liners and .pisto:Ds
•.
Dismantle
the
.
piston
7
conne·~ting··rod;~·as
sem
biles
,
inspect·
the
wear
condi
tions'of:
the~cyli~der
liners
·,:.p"istq:qs
and
piston
rings
e
Replace.
the
pistont~ngs·;·
if.'
necessary.
5).
Dismantle
the
sump,
inspect
the
wear
conditions
of
the
crankshaft;
main
bearings
t,thrust
bearings
and,. connec.ting.·
•.
·.JrQd
bearings.
6).
Dismantle
the
lubricating
oil
pump
and
adjust
the
end
play
of
the
rotor
if
necessary.
7
).
Inspect
the
dynamo
and
starting
motor
,··rene~
the···.gfe~se
in
the
b~arings
e
8).
Ins
p~ct,
adjus
tand
test
the·
.injection
pu~p.and
the. gove,!"-
nor
(if
it
is
necessary).
Chapter
VI.
Engine
Troubl~s
and
Their
Remedies
In
order
to.~nable
the
users
·
to,
identify
and
'remedy
.the
engine
comDlontroubles,
the
general
faults,
·probable 'causes
and
their
remedies
are
listed:'as
follows':
,
1~
Engine
Fa~ls
to
Start
Abnorm'ality 'and.
Ca
use
1 )
The
starting
motor
fails
to
rotate
the
engine.
(1
)
Insufficient
battery
voltage
o.r
.badconnection
In,
starting
electrical
system.
(2)
The
pinion
of
the
starting
motor
fails in
meshing
with
the
flywheel
ring
rear.
2 ) A
dense
white
smoke
emits
from
the
exhaust
manifold.
(1)
Air
.trapped
in
the
fuel
pas-
sage
( 2 )
Decompression
mechanism
fails
to
return
96
Remedy"
( 1)
Recharge
the·
battery
or
e-
liminate
the
fault
in
connection.
(·2
)
Adjust
the
stroke
of
the
electromagnetic
switch
core.
(1)
Vent
the
air
according
to
the
maintenance
procedure
of
the
fuel
system.
(2)Check
and
adjust
it.
(3
)
Insufficient
preheating
of
the
engine.
(:4.)
The
.
fuel
spray
IS
no't well
,
atomized.
(5)
Incorrect·
fuel
delive·ry ad-
vance
angle
(Owing
to'rein-
stalling
the
injection
pump)
(6)
Water'ttapp.ed
'in
the
cylin-
ders.,
(
7)
Insufficient
compression
pressure
in
cylinders.
(8)The
starting
hole
on
the
swil
chamber
inserts
are
blocked.
3)
No
smoke
(or
only
a
little
black
s'moke)'com~sout
from
the
exhaust
mariifold~'
-
(1
)
No
fuel
in
the
fuel
tank
(3:Jln"
winter
;,the
e'ngtne'
cooling
system
should
'be' filled'With-hot
watet"'B~fbre-
starting:
aha
{,pre-
heat
the
air
intake
manifold
with
the
preheater.·
(4)Inspect
and
adjust
the
injec-
tor
or
replace
the
nozzle
assem-
bly if
necessary.
"(S)'Chech
'and'adjust
,:the fuel
delivery
advance.',
angle:.,:.
It
should
be
of
1
7°
±
2°·
before
T.
D.
C.
( 6 )
Inspect
the
cylinder
head
whether
there
is"
a
crack
on
.'
it
and check
the
cylinder
hea.d.·
gas-
ket
for gas,
tigh.tness.
(7·)
Remedy
it
according
to
the
. . .
,~ioce~~re
specifjed
in
the
sec-
tio~o;o~
_
"Insufficient
compres-
,'::~ion'
riresstlr·e.:
in
cylinders"
lat-
er.
(8)
Clean
off
the
'
deposited
'clift
to
make
theim
unblocked.
(!)Replenis'h
it'and.
vent
the
air
from
the
fuel
passage.
97
(~?The",tQP
lEfJler
of
itJ:le "gover-
,(?)
Pu~h)t,
forward
to.
its
end
..
l1;o~
f~ils
to
return.
position.
:
')
(~)
Fuel
..
p~ss8:ge
is
bl,?~ke4
(4)
Control
:rod,
o~.
the
inj~ction
pump
i~
stuck.'
(S)The
feed
pump
fails
to,sup-
ply
fuel~
( 3 )
Inspect
the
fuel
passage
from
fuel
tank
to
the
injection
pump
(The
screen
inside
the
:.
\>anjo"l
:,
co.nn~.ctiqn,
bol
t,:·
of
~.
the
feed
pump
should
h,e
ch~cked
first).
Eliminated
it.
(4
).
~sQlantle
the
,insp.ection
window
coyer,
to
inspect
the
control
r:od.:
..
If.
it
is
stuc~"
s:e.nd
the
injection
pump
to
a
service
workshop.
£or.rem~dy.
(5
)Check
whether
the
pisto~is
stuck
and
inspect
whether
the
valve
and
the
spring
are
in
good
·conditions.
2.
Unst~adyRunning
of
The
Engine
Abnorm~lity
&.
Caus~
1).
En;gip~
ru.~nin~~
intermit-
tently.
(1
)
Poor
qualitty
of
the
fuel
or
the
fuel
contains
water.
~.(2)Air
t!appeq
in
fuel
system.
98
Reme.dy
(.
1)
Ch~ck,
the
fuel
quality
and
.
renew
it if
·~e·~~ssary
....
(2)Vent
the
air
..
(3)Urieven,,fuel
delivery
to
each
cylinder'.
(4)
Fuel
i1)jection
pipe
cracks
or
pipe
connection
gets
loosen.
(S)Water
enters
into
cylinder.
(6
)Plunger
spring
breaks.
(7)Fuel
spray
of
one
or
two
in-
jectors'is'
n'otwell
iitomized.
(
8)
Insufficient
compression
pressure
in
ontor
the--cylinder.
(
9)
Plunger
control
arm
loosens.
2).
Rough
runing
of
the
engine
( 1)
Fuel
injecting
pressure
'of
the
injector
varies.
( 2
)'The
nozzle
,assembly
"gets
strck.
(3
)
The~c6nttol-:for'k
on
control
rod
of
injection
pump
gets
loosen.
(3~)
Check'.and·,adjust
th~,~
inje~
tion
pump'
ona'speeial~'l.~.;te8t
stand.
,(
4-)
Replace
th:e'
"fuel',injecttQn
pipe,
or
tighten
the
cq,nn~ti(i)n
nut-tor eliminate·
the
leakag~
..
'(f5·.) Tig,b
tell;
tile cylinder:'
htad
,;flU't,S
£irst.lf:;:it'·riS~A.;·1n
.
Yaiti:.'2·:,th·~
cylinder
head,
cylinder
liners
should
be
inspected·~
(6)Replace
the
spring.
(7)
Cheek
,":aa'just
~or
repalce
the
no.zzle
assembly.
( 8)
Reme
by
it
according
to,
";the
procedure
specified
in
the
sec-
tion
of"
Insufficient
compresion
,preSSure
in.cylinders
"later.
(9)Replace
the
plunger.
(l.)Checkand
adiust"the~,fuelin
jecting
pressure.
(2
)
Wash,
inspeG~!"and:lap;:it
'
..
Wit}l
lubricating
oil,
or
replace
it
if
necessary.
(3
)'Dismantle"check
and'~'~djust
the
injection
.pump·{on-asp~cial
test
bench).
.
,9.9
3
).
,The
engine~
:emlts dens'e
'black
smo.ke .
to
---
get'hel:
with
shrill
pounding noise.
.'r-he'
:::nozzle
-
'8ssem
bly
IS
,'.S
tuck
'seri0USly.
4).'
,A
,hiss
comes
'frODl~~
the
in-
·take manifbld (,It
can
cll.e
hea:td
'clearly:~_in
the:.engiDe
running:.at
idling).
The
valve
leaks.
'5)~
Engine
runs
unsteadily
·
The
governor
is.·,not,
so
sensi:-
tive.
Adjust
valve
lash
or
lap
the
valve.
Send
it\~o,
-
~
~er:Vl~,e
wor~shq,p
f9f·
.check
apd
~epair.
"3.
Insufficient
Engine
Output
Abnormality
&.
Cause
1
')
•Insufficient
Compression
pressure
in cylinders
(l)V'alv.e---spring
breaks.·
'(2) Valve lashf
is
too
small
or
even'·becomes-.to
-zero.
(3)The
valves leak.
'100
Remedy
¥(
1
).
C,rank _
t.h~
e.ng~ne
tQ
~:et
the
piston
reach
its
T.
D.
C.,
,and
then
replace
the
spring
(2)Adjust
thevalve,lash,
(3)Lap
the
valves.
This manual suits for next models
6
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