YANGDONG SERIES Y85 Manual

~®
SERIES Y85 DIESEL ENGINE
OPERATION & MAINTENANCE MANUAL
YANGDONG co., LTD.
THE PEOPLE'S REPUBLIC OF CHINA

FOREWORD
Series Y85 multi-cylinder diesel eneines are ideal power units for Iieht vehicle,
aeromotor,small
tractor,air conditioner in bus,eenerator set and eneineerine machinery.
The normal and reliable operation and lone service life of the eneine depend not only
on the
manufacturine Quality,but also on the reasonable operation and correct
maintenance.
In order to provide the detailed description and instruction of this eneine for
operators to manipulate it correctly in short time,we offer this manual which briefly
describes
the performance of series Y85 diesel eneines to operators,maintenance workers
and relevant maneers.
Since the construction of this ene:ine is subiect to frequent improvement and
development durine production and practice,it is possible that the eneine supplied is
somewhere not exactly the same as one described herein.Please pay attention to that when
readine the manual.

Warning Notice
1.[t IS strictly forbidden to use inferior and dirty diesel fuel or lube oil. Please choose
to use fuel
and lube oil with stipulated number accordin2 to the instruction.
2Jt is strictly forbidden to leak out from afl intake system(air filters,pipelines and
connectill2 components).
3.lt is strictly forbidden to have hard water(well water or soprin2 water)as coolin2
water,lf necessary to apply the hard(water),soften it first.
4.!t
is strictly forbidden to start under the circumstances of lack of lube oil or water.
S.lt
is .trictly forbidden to operate at overload or under other conditions a2ainst the
rules.
6.1t
is strictly forbidde to re2ulate the fuel iniection pump at will.
7.1t
is strictly forbidden to chan2e the diameter of the pulley.
8.To control the
startin2 time(less than IS seconds) and the startin2 i'lterval (more
than 2minutes) strictly.
9.
It's amust to maintain the diesel en2ine techanically in the allotted time.
lO.Unskilled workers
are not allowed to dismantle and assemble the en2ine and its
spare parts.

CONTENTS
I.Configuration and Installation Dimensions of
Model YND485Q Diesel Engine I
II. Confi,lluration and Installation Dimensions of
Model Y485 and YDI485 Diesel Engine II
Ill. Confi,lluration and Installation Dimensions of
Model Y385 Diesel Engine'" III
N. Perfomlance Curves of Model YND485Q Diesel Engine N
V . Performance Curves of Model YD1485 Diesel Engine·········· .. · V
VI. Performance Curves of Model Y485 Diesel Engine'" VI
VII. Performance Curves of Model Y385 Diesel Engine VII
SECTION 1. DIESEL ENGINE SPECIFICATIONS AND
TECHNICAL DATA .
I . Specifications of diesel engines , 1-1
II .Specifications of the main accessories 1-2
1II .Main technical data of diesel engines .. 1-3
IV .Fit clearance and wear limit of main parts 1- 4
SECTION 2. OPERATION
I . Fuel oil,lube oil and cooling water 2-1
II .Preparation before starting 2-2
III .Starting 2-2
IV .Operating .2-3
V . Stopping 2-3
SECTION 3. MAl TENANCE
I . Routine maintenance . 3-1
II .Maintenance after every ]00 accumulated operating hours 3-1
II1 .Maintenance after every 500 accumulated operating hours'" ,. 3-2
IV .Preservation and storag~ of engine ,3-3
SECTION 4. ENGINE ADJUSTMENT
I . Adj ~stment of valve lash .. 4-1
II .Adjustment of injection timing .. 4-1
III .Adjustment
of injector 4-2
N.Adjustment of lube oil pressure'" 4-4

v .Adjustment of injection pump 4-4
VI .Adjustment of decompression ann lash "'4-4
SECTION 5. CONSTRUCTION OF' DIESEL ENGINE
I . Cylinder head 5-1
II .Cylinder block 5-2
ill .Piston and connecting rod········· 5-3
IV .Crankshaft and flywheel ..·.. ···· 5-5
V . Camshaft5-5
VI .Gear transmission system 5-6
vn. Fuel and governing system 5-7
Vill .Lubricating system 5-8
IX .Cooling system 5-10
X. Electric system········· 5-11
SECTION 6. FAULTS AND REMEDIES FOR DIESELENGINE
I . Hard or refuse to start ... 6-1
II .Power insufficiency······ 6-1
III .Smoking exhaust 6-2
IV .Knocking noise in engine 6-2
V . Lube oil i~sufficiency or no pressure·· .. · .. ··· ..·6-2
VI .Overheating of engine .. ···· 6-3
VII .Engine running-away'" 6-3

190 194
•
oc.L.I"\<Ou"'IO
C'4...#"r-C7'~
View B !cylinder block)
A~
~~~~~Ct ~
~
~
C>
~
View A (cylinder block)
510
160
697
~II/IIII~~~£ ~jj .. t¥jill Y"l==n
~II ~l=fMMWI ~
~
I a.;
~
IBI
I!
.....
I, Configuration and Installation Dimensions of Model YND48SQ Diesel Engine
o
I-
;g
....
'""'
1
~
""
""
...
Dimensions of water inlet and outlet
1:1
'""' '""' 0
~ ~ ~j I< / / / / <<9
"" ~ ~
~ ~ ....
........ '""'
'""' '""' E
~ ~ ~
u... u... ~
~ ~ ~
~ ~ ~! I7777 71
Exhaust outlet centerline
1:2 ~60
o
I
o
Installation dimensions of engine base foot
1:10
430
. I
~I - [~nkshaft cerrter~~ i ~
!UTI I
I
11-Hl0
Evenly distrubuted
Connecting dimensions of flywheel afld Its housing

o
>--
~
...
~
~
~
co
,.,
...
View A Icylinder bloCkl
--
View B Icylinder blockl
Di~ensicns of water inlet
)01
~~~~~NCI
ClN~~~~V'"!
S?-~
1-M10
::;
;
j
~ J
~I 17 / / 7 7J
co
~
~
-r
, =
~
...
189
Exhaust outlet centerline
11 ¢60
494
65
190
,,,~---~~~I ~
Inslallaf,on dimensIOns of engine base foot
1.10
o
{
oI
s [rankS haft centerli!}L i ~
,., ....
4-¢11
rI
12-M10
Evenly distrubuled
5805
5637
681
[onneding d:"lenslons of flywheel and its houslrg
15'
=
....
,.,
..
=::I
ll. Configuration and Ins t allation Dimensions of Model Y 485, YD
1
485 Diesel Engine

190 I
1S'
---
s
Comcctirg dmcnsions of Ir,whecI and ns houshg
• supply be<;m'9 60200
according locuslomer's ~
roquosl.ThcdlSforcc \ ~
Wlweenlhe ouIcrend ~
foee at the bearing 10
lhat of the ftywheells
62.
376
587
Instol1otbn dmcnsions of erghe bose fool
+Oonkshafl
cenI<Yfhe
-----------
~.
324.5
~
I
65 ,117
...J!!S..
242
340
494
189
74
5"
I-"
l/eN A Icythdcr bIodcl
~~
¥'eN B IcyII-dcr bIodcl
~
Oinensbns at wdlef inlcl/outIct
~I·rq, r·
III. Configuration and Installation Dimensions of Model Y385 Diesel Engine

Tr
('t )
550
500
450
Ne
(kW)
35
30
25
20
15
ge
(g/kw •h)
255
250
245
~40
235
R
,,
Tr
-
~
--
~
---
.--
~
"...
--
-
........
-
.......
......
~
~
l/
.....
r---...
/
Ne I--'
,......
.-
--
..-
I..---"
~
........
".,..
~
...
~
"-
ge
:.,.....-
~
"'-
--
...-
-
~
1200 1400 1600 1800 2000 2200 2400 2600 2800 3000
IV, Performance Curver of Model YND48SQ Diesel Engine
N
R
(BOSch)
35
25
Me
(N •m)
125
120
115
110

30J
Ne
(kw) 25
20
260
ge
(g/kw •h)
250
240
230
220
.l!
~
~
..-/'
/
---
./
v
~
~
--
L-
V"'"'
VV
/
'/
v
~
-
~
Ji-
,,-
~
./
~
~
.........
.............
r--
./"
i'..: "
""
-
..,.,/
ge
:/
.........
V-
./
.............
..............
J'
/
.........
-
t
550
Tr
('C )
500
450
120
Me
(N • m)
110
105
100
95
1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200
n(r/min)
V. Performance Curves of Model YD,485 Diesel Engine
v

Tr
('t: )
600
500
400
Ne
(kw)
32
28
24
20
16
12
ge
(g/kw • h)
280
270
260
R-
--....
-r---
r-
Tr
--
--
---
I--'
-
I--'
M..;
f- -......
.....-
..-
.............
-
I---
~
Ne
.....-
~
--
V-
/'
/
./
/V
,
/
---
r-- ge ---
-
1000 1200 1400 1600 1800 2000 2400 2600
n(r/min)
VI. Performance Curves of Model Y485 Diesel Engine
Vl
R
(BOSch)
4
3
2
Me
(N • m)
120
110
100

R
(BOSch)
4
3
2
1
Me
(Nom)
90
80
70
ge
(g/kw' h)
280
270
260
R -.
"
'"
-
Tr
~
"".,.-
--
~
Ne
~
,.,.-
---
r--
~
--
1-
--
-..
---
I
~
.---
l"...o-"
~
-
~
~
V
V
./
,/
~
I'
~
.....
.......
VII""
--....
r--.
ge
~ ..
V"
--
Tr
('C )
600
500
400
Ne
(kw)
21
19
17
15
13
11
9
1100 1300 1500 1700 1900 2100 2300 2500 2600n(r/min)
VII .Performance Curves of Model Y385 Diesel Engine
vlI

SECTION 1. DIESEL ENGINE SPECIFICATIONS AND
TECHNiCAL DATA
I. Specit1cations of Diesel EnJdnes (see Table 1)
Table 1
2.156
~247
U
IU
1
I.
687 X 494 X 623
- -- --- J - __ =-~95- ---
~248.9
195
YD
I
485 YND485
'1---- - --- ----
. Vertical, water-cooling, four stroke. direct injection chamber
I _ _ __ _ __
4
----'------- --
2.043
85
2.72
Counterclockwise
~267.9
687X494X61O
1
I
_ Forced water Cooling
Electric
190
--I
1-3-4-2
-----.---- - ----
116.6(12ht= 26-32 27-33 1 29.4-36
-' ~1l00. 2400-3000- 2600:.3200 -- = 2~32.00 3
_t ~82.9 _ ~ 112__ ~ 108.3 ~ IL8.2=--_
~278.81
(with fan)
j -
Y3!S__ _Y385U Y4~ _
Vertical. water-cooling, four-stroke, vortex
--I --- -
587X494X610
165
Model
Type
.1-- ,_
__ Nunlber of 0E!!d~rs i _ _ _, _ _ _-=-3 __
Borei~l~
Stro~i1!@t J __ __ _ •. __ . _ ._9!!- __ ~ __
__ _ Compres~i.9n_ratio j_ ___ __ __ _ _ _ 22
Tf)tal dispiacemenl(L) : 1.532
,
Firing order - -r - -- 0. -- - ~2-
._-- - -t - ----- --
Z I_Rate~w~\y)___ 19l:~
_~!~d speed_Crfuli!!l r 21QQ.- 3~
___ Ma\.to~.~) .... _. ~84
Min.specific fuel consumption 1 ~267 9
__ ~t fuilload~~~.h) I _ '" •
Specific lube oil
consumption(g/kw.h)
-Ap-~~~~~;o~~I~~~x~~rrfn~~S (llil-h ~-O~~-/~~-' ~e) l.l~~J-1 -}~~J_l ~4~J 1_14±~ I~ilhl-~;-:-~-\ice-) 1)~~I-}~-~-1 ~)i~-with-l~-Jv~;~~~ce)Df&J -1 (wi~i~j::C;~~ice)l )~~J
_Injection Pressure ~ .. __ _ _ _ __. 13.2±0.5 __ ! 12:.6 _
Direction of crankshaft
rotation (facing to flywheel)
Cooling method
Starting metho~
_ _ Net mass(~g)
Overall dimensions
LXWXH)(mm

II .Specification of Main Accessories(see Table 2)
Table
:.
QDI315A, D138Y
,ozzkset
,-
Designation
Water
pump
Fuel
injection
pump
Starting
motor
Air filter
Lube pump r
I
I
I
-,
3
2
4
5
6
8
9
1--_ __ 3cification _ --- --- _
I _Y385 J . Y385T. -.: .Y 485 _1 YD
l
485 YN0485Q
Type! I pump I ,BQ or IW pump I BQ pump
Govemor ~ ~.- ~ :1\1l'so.e~, m~c~~n~C~!5;;;t~fugal -,
Plunger diam~~l1lmLL _. _ _ _._7 -I __ 7} :.~Z _ ,- __ 7.~
I Fuel delivery pump I__ Sjngle.ac!~ngyis!on ~p~_
Model P21 PF68509
,
Single-hole, Pmtle-typc .zS4SI ZCK 1548423 ZCK \j4S42S
_L-.__ __ _ _ _ .,.- _
Fuel I Diameter of Nozzle ~ 4.lI>0.23 I 4· lI> 0.25
injector hole(mm) I
~-- ---,------ ----- -; - - ---- -~-
! Injection pressure(Mpa) I 13.2 ± 0.5 ! 19.6+
01
--. -- --+ -------- . -. ----'-.-- -- I
_ :!ype L , l~o~r__ __ __ _J _ G~! _
_ ~pe~dlr/mi'!L~_I300 __ --L 1800.____ 2748
Capacity(lJmin)! c 18 I 30 22.4
- - . -r--- ---- ----l. - - -- ---
Pressure(Kpa) 0.4
__ . __ L . _
Type: Centrifugal, volute, single-suction
- - - -r--- - -- -- -. ----- - --J - --
Spee.d(r/min2 _ __ . . __ 3090_ _ _ _ _ __ _ , _ 4QOO
c~pa3~~;mj~-t--T- __ ~- - 8f~- _~= _ =-=.~~~], 1:0
Type I Series DC motor
- ---
Model QDI322C.QDI315A,Dl38Y
- ---_.- -
Voltage(V) 12
- - - ----+ -- - - - --,--- --
!ower(~WL _+ __I:! or 2.~ __ L . _ ~5 _ _ _ '
__ Typ~ _-+~ Silic~3.ctif)'ingshunt~~am~ _
Model I JFt1
Dynamo - - t - -- --- ---.- -- ---.
Power(W) __ I ~~O
Voltage(V) I 14
Typ;-- -r- - - '---·Sl;;-gle stage, papert:lem~~-t --------
7I Fuel filter ,-Model T-
--- -- --- 'C0506A ----- -- --
--t - --1------·· -------- ----- -.
Lube oil I _ Type __' +.__ _ Si~~e sta~e, paper el~~~t _ _ _ _
filter Model L J07Q~ _I _ J08~0!J __
Type Single stage, paper element
_ M~~I -=---=L __ _=--= ~ !.13I7A' --~ - ~ I_
I0
Electrothermic I Type Shrouded I
plug -Model 1--- - - 10=12--=-65 --- I NO accessory
1-2

t~ 620
t~ 600
t~ 550
~ 100
III.Main technical Data of Diesel Ene:ine
I. Valve lash(mm)
Intake valve(cold)
0.20- 0.25
Exhaust valve(cold) 0
.. 25- 0.30
2. sinkage ofvalve(mm) 0.7- 0.9
3.Torque limits
of main bolts and nuts(l\J' m)
Cylinder head bolts 150- 170(Y385,Y385T,Y485)
Main bearing cap bolts
175- 195 (YDI485.YND485Q)
Connecting rod bolts
110- 130;140-160(YND485Q)
Flywheel bolts
50~ 60;70-80(YND485Q)
4.Temperature and pressure limits
60-70
(I )Exhaust temperatureCC )
n~ 3200rpm
3200rpm>n>2600rpm
n~ 2600rpm
(2)Lube oil temperatureCC )
(3)Lube oil pressure(Mpa)
At normal operation
At min. Steady Speed
5.Governor Characteristics
Min. idling steady Speed
Steady regulation
0.2- 0.4
~ 0.05
~ 900rpm
5% -10%
1-3

IV .Fit Clearance and Wear Limit of Main Prts(see Table 3)
Table 3
Designation IAs!'enbly limit Wear limit
(10m) (10m)
0.20
0.10
0.20
0040
I
-----~-- ......
;0.040·0.105
~~ - ---
0.025-0.044
i
I
- -T -- - --
I0.100-0.155
--------1-- -------t-
the Ist ring and its groove 0.060-0.092
- -;-- _._--
2 IPiston pin and connecting rod small end bushing
-3-
1
Pi:t~n ~ki~ an;cy~nde;li':-- ---- - ----
- __ I ~ _
I
4Side clearance between
1iConnecting rod journal and connecting rod bushing
__ -I _
,
5Side clearance between the 2nd ring its groove 0.040-0.072 0.18
6ISide clearance between the oil scraper ring and
it<; groove '0.030-0.067 0.18_
7Gap of the 1st ring
--l- - -- -- -
8I Gap of the 2nd ring and oil scraper ring
I _
9ICrankshaft main journal and main bearing
:0.300-0,450 :.60
__ L._ . I-
,
!0.25-0.450 2.20
- - -j- --- - -,---
o070-0.139 0.25
10 ICamshaft journal and bushing 0.05.0-0.100
-- .-- ---~~
,0.18
11 IIdle gear shaftjournal and bushing
-j---
---------
I0.025-0.075
-,- . " .. _ __..1_
0.18
0.15
0.20
0.15
12 Intake valve stem and valve guide 0.025-0.069
-1-;-1 Exhaust v:~e stem and valve guide - ------ - - - : 0.040-0.077 I
~to~ker :rm shaft and bushing --- -- - - -- -- ,- 0.02~-0.071 !-
I
- - - -- --- -- -- - _ .. --r--- - - -
IJ
15 Axial clearance of crankshaft 0.075-0.265 I
.__ _ __ _ _ I _ _
16 Axial clearance of camshaft 0.050-0.220
L.......-!----- _
1-4

SECTION2. OPERATION
J • Fuel Oil ,Lube Oil and Coolin2 Water
I.Fuel oil
Users can select the proper grade
of fuel oil accrding to the local ambient temperature. In
the general area in China,the grade of fuel oil is according to the standard GB252 light diesel
fuel.Use grade "0" light diesel fuel in summer, while in winter. use grade
"- 10" light diesel
fuel.Before being filled into the engine fuel tank,the diesel fuel must be settled for along period
(normally at least
48 h).Then draw out the upper part.The fuel should be filterd by silk cloth
while filling it into the engine fuel
tankJt will extend service life of injectors and injection
pumps by using the well settle diesel fuel.
2.Lube oil
In the general area in China.users can select the proper grade according to GB/Tl1122
Lube Oil of Diesel Engine.Use grade CD40 lube oil in summer,while in winter use grade CD30
lube oil.When being filled into the engine oiJ.tank,the oil should be filtered by screen.
J.Cooling water
It is recommended to use soft water such as rain water,city tap water,or clean river water for
engine cooling.Well water
or tap water from well water could not be used. Cooling water
containing too much minerals will form water scaJi
in an engine cooling system,affecting the
engine cooling efficiency and giving rise to engine troubles.
Hard water(well
or spring water,etc.) should be softened before being lIsed.There are two
softening methods;
(I )Boiling up the hard water;
(2)Adding 20g caustic soda (sodium hydroxide) to each 30L hard water to make up a
solution.
When the engine operates in cold weather where the cooling water
is liable to freeze,anti -
freezer can be added to the cooling water to prevent it from freezing. Glycol
or alcohol aqueous
solution
is most ordin!iry.
If it is difficult to start the engine under lower ambient temperature, heat the water to about
80·C before filling it into the cooling system.
2-1

II.Preparation befor Starting
I.Check the tightness an dreliability of all connecting parb.Ch':'ck ("( ntp,l levers (speed
control lever and stopping lever) to see vvhether they can be m0ved fredy.
2.Rotat.: the
eranbhaft severalturns.lJe sure that all movi.,g part~ move frflely.
3.Check the oil level in the oil sump and injPction pump tv sec whether it i.~ kt'pt v,ithin two
marks on the Jipsticks.Make surf' that the fuei tank nU:l sufLcif'nt fuel :1nd lila, the flld pipelIne£'
are unblocked.
4.0pen the fuel tank cock.Check whether there is :ur HI the fuel .. ;tcndf necessary 10fJ~en
the vent screws on the fuel filter and injection pump.opt-raie the prillling Tump on the fud
delivery pump by hand until the fuel flows out of these screws wit}lOut Lubblc5,al1l1 retighten the
vent screws.Mter that,loosen the union nuts of injection pipt:s on the init'ctors and rotalt, the
crankdhaft
to bleed air from injection pipes,then reLighten thf' union nut".Check all fittin~" ,)f the
fuel system
to see whether there is any leakage at all joints.
5.Check the radiator
to see whether it is filled fuliy with Wl'ltcr Clnd whetlwr there lS any
leakdge at all ioints.
6.Check the accessories to see whether they are firmly and reliably
vmn~ct -ed.Check the
eleetrical system to see whether the battery is fully charged,all
wiring:> an: correct amI all
connections are tigh·tened.
7.Check the clutch to see whether it ha. wsengaged.
ill. Starting
l.Set the speed control lever at the middle speed position.
2.Turn the ignition switch
to "preheating" position to heat the e1ectrothermi,; plug for 20-
30s.
3.Tum the ignition switch
to "on"position.Press the starting' button to start the engine.Jf it
fails
to start,release the button immediately.Wait 2minutes 3minutes.before starting the engine
again.If the engine fails
to start after 3attempts,cher:k the cause and remedy Lh~· fault.
4.As soon as the engine has
been started,release the press button immcdiute-ly.Then turn the
ignition switch to another position to charge the hattery.At the same time move the fuel control
lever until the engine runs at iuling speed.Check the
op-eration condition uf the engine to see
whether there is any abnormal noise.Especiallypay close attention to the reading., of oil pressure
gauge,which should be within specified pressure limits.Then warm tle eng
we up with enpne
specd gradually in-creasing to 1800-2000r
/min
2-2

IV. Operating
l.Do not load the engine until the cooling water temperature is over 50"C and the lube oil
temperature is over
40"C. The engine should not be operated undrer rated operated under rated
output before the outlet water temperature reaches approximately
80"C.
2.Increase or decrase the engine load and speed gradually and evenly.In normal case,do not
load and unloa,d the engine suddenly.
3.During operation,observe the gauges on the instument panel frequently where the readings
should be within the specified limits.Pay close allention
to the exhaust gas color and the
operating noise.If there is any fault,stop the engine alld inspect it.
V. Stopping
l.Before stopping,tllke off the load and reduce the engine speed gradually.Let it run at idling
speed for a
few minutes.Do not stop engine until the outlet water temper-ature falls to below
70"C.
2.After stopping th~ engine, the ignition switch should be turned to the middle position,
3.In winter,when ambient temperature falls to bt>llow 5"C ,after the engine stops and the
cooling water temperature falls
to below 60"C ,open all drain e,ocks on the cylinder block and
radiator
to drain off all water remnant within tht: cooling system,in order to avoid damages of
parts
due to freezing.If anti -freezer is added to the cooling water,it is not necessary to drain
off.
2-3

SECTION 3. MAINTENANCE
For reliable engine operation with less wear and longer service life,all mainte-nance work'
must be carried out as follows.
I . Routine Maintenance
1. Check the oil level in the oil sump and it should be between two marks on the dipstick
and near the upper one.For anew engine or the engine
reu::;ed after stopping for along period,the
lube oil must be filled to the upper mark,and operate the engine at lower speed for S-lOmin,then
stop the engine and measure the lube oil level once again.
2. Check the cooling water level in the radiator.
3.Check the lube oil level in ·the governor of the injection pump,replenish the oil
to the
specified level if needed.
4.Eliminate oil,water and gas leakags of the engine.
S.Check tightness and correctness of all components attached
to the engine.
6.Check tightness and reliability of engine foundation bolts and the connection between the
engine and the dirven machinery.
7.Keep the engine clean.Oil,water and dust gathered on the engine surface should be wiped
away with adry rag or cloth dipped in
gasoli~e.Especially keep the electric equipment clean and
dry and clean out the dust on the fins of the radiator.
8.FOl the new engine,after SOh trial running,renew the lube oil in the oil sump,fuel injection
pump and governor,and flush the oil filter element,oil sump
and' oil strainer.
9.Promptly eliminate the troubles and faults found.
n.Maintenance after Every lOOAccumulated Operating Hours
Besides the "routine maintenance" work,and the following items:
I.Renew the oil in the sump.
2.Clean the oil filter or renew
tht paper element if necessary.
3.Clean the fuel filter or renew the paper element if necessary.(It may as well be replaced
after every
200 accumulated operating hours.)
4.Clean the oil filter or renew the paper element if necessary.
S.Clean the valve lashes, reddjust them according
to the reeommended procedure if
necessary.
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