Yanmar YSE8 User manual

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iIODEL
YSI

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8.
ENGINE I\ PHOTOCRAPHS
OUTST.{\DNG FE.{TLRES
GENER{L DESCRIPTTON
3.2 Po*er Take-off ShaftPulleys .. ..
PERIODICAL }LdII{TENANC E
FUEL ,\\D LUBRICATING OILS
5.
t FuelOils
;. 1.1 Propert! requirements
byviscosity 7
-8
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.
CONTENTS cr/ol -4"!cl,( .
Page
OF YSE SERIES
Dlanos
1
2
3
3
5
6
7
7
7
5.2.2 Classification
5.2.3 Recommended
6. TROUBLESHOOTING .....,..,....,.,. 10
-
6.1 EngineDoes
\o1Start . .,.,.,........,...... 10
6.2 Difficult
Srafi-up ...,. ...,..,, ....
.,
.
., 1l
6.3 Bad
ExhaustColor ....,...I2
. '=--,---6.4 Momentarl
High-speed
Relolution ... ... ,....,.. 12 '.
6,5 Hunting ...,..........
12
6.6 OutputDecrease
. ............. 13
6.? Knocking during Operation 13 ,
6.8 SuddenEngineStop ..,........... . 14 l
6.9 Lubricating
OilLeak ...... ......,....... 14 I
6.10
Fu€l
Oil
leak
... ...
-............... 14
6.11Water
Leak ...... ..... . 15
6,12 CoolingWaterFailure .. .......,. 15
6.13ClutchSlip
............. ................
15
WEARLIMIT OF EACH MAIN PAR'T ... ..,........... TE
INSPECTIONAND sERVrcrNdoF MAIN p-{RTS .. ..-.-.-rih.-.. ........ t7
8;l Fuel InjectionPumpancl Nozzle ....,. ,:,..,.. .,,,.. .. . 17
8.1.1 Fuelinjection
pump ......... 77
8.1.2 Fuelinjectionnozzle(throttleno2z1e1.,.,.,..,..................19
8.1.3 Air venting ...
..
..
.
.
..
,
.....
.
.
.
.
. 21
8.2 Cooling
Water
Pump .....,..22
8.3 CylinderHead .-..-.-...-.........-..24
,ta
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Page
cting
Rod
Assembly .,............... 26
30
32
8.4
8.5
8.6
8.7
Piston and Conne
Cylinder Liner
Crankshaft andMain
ElectdcaI EquipmentBeafing Metal
8.7.
1 Stater
8.7.2 Generator 36
37
38
38
38
39
40
4I
9. ADIUSTMENTS
9.1 Governor Lever
9.1.1 Adjustment
procedure
9.1.2 Readjustment
procedure t
9.2 Inbke/ExhaustValve 39
39
39
4T
'4r
9.2.1 Adjustment
procedure
._9.3 Fuel Injection Timing
9.3..1.. Checkinghints " :'.' ","'-"_b "'_"_
9.3.2 Adjustment
procedure
DISASSEMBLY
10,1 Preparation
10.2 Serviceman'sKit
10.2.1 General tools
10.2.2 Specialtools
10.2.3 Measuring instruments
10.2.4 Others
10.3 Precautions
10.4 Cl ul.ch
Disussemblj Prucedu-re
42
42
43
43
43
4?
48
11,
12. STERN ARN,ANGEMENT
REASSEMBLY
11.1 Precautions
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1. ENGINE IN PHOTOGRARHS
Eyenur {for hosi ngenqine)
F
t
t
(only for electi..l startng)
Propeller
shaft
;uprinq

2.OUTSTANDING
FEATURES
OF YSESERIES
1. Its extra-compactness, light weight, andlarge outputpermit engineroom to be
miniaturized.
2. Wet tlpe single-disc clutch, andreduction/reversing gear offer very light forward/
backward change, easy andpositive operation, and outstandingdurability.
Selection of crankshaft-to-propeller shaft ratios: 2 : 1 and 3 : 1.
Selectionol starting systems: electric starting, coupledalso available with handle
starting, and handle stafiing with speed-up chain gearing (available to install on
either
boworstern
side).
5. All-speed gove-rnor, insterlocked \tith easy-to-operate, durable Yanmar-Dickel type
fuel injection pump. assures minimum load fluctuations andexcellent low-speed oper-
ation,
Rotary type cooling water pump feat.rring ample circulating water andsimple construc_
tion makestheengineseizure-free.
Flywheel enclosed in the cllrtch housingprovides safety to the operator.
Full sealedforced lubrication system saves oiling labor dudng operational mode,
andthereby increases working efficiency.
3.
4.
7.
8.
6.
9. Constructional simplicity of component
parts makes the enginevery easy to operate,
maintaitr, andinspect.
a
2
'..-:
f

3. GENERAL DESCRIPTION
Each of Yanmar diesel engines, models YSE8andYSE12, comes equipped
with
clutch reduction gear, which togethei with a flywheel is totally enclosedin the flywheel
housing andthe clutch housing. The propeller shaft is run from the flywheel side.
The starter for electrical starting is directly mountedto the fly\rheel housingto
drive the ring gear of the nyl,heel For chain starting, the power take-olf shaft is
chain-connectedto the starting shaft located immediately abovethe cjlinder. The engine
is started b]'clockwise rotation on the stern side andby counter-clockwise rotation onthe
bo'i{side.
3,1 Construction
{
Part Description
& Specifications
1. CrI. bodr llonoblock casting of water jacket, crankcase and
oil pan.
2. Cyl, liner Wet tlpe made of special cast iron andcoatedwith
special anticorrosive paint.
3. Main
bearing
4. Cyl.
Sidecover side: precision kelmet metal with thin
backmetal.
Fl]'wheel side: Thick meta-I.
Gaskettfpe, part of monoblockincluding valve guides.
5. Intake/exhaust
valve Mushroomttpe.
6. Intake pipe lntak€
eneniatype
mad€of st€el.
7. Exhaust
silencer Round, expansiont!pe, or water injection type'
8. Valve drive system Tappet & valve push rod type. Parabolic suction/
exhaustcam with approachramp.
9. C
rankshaft Stampforged, with induction hardenedjournal, pin
andoil seal portions,
10. Flywheel Mountedto clutch, enclosedin flywheel housing-
11. Piston Made of aluminum alloj/, oval shaped.
12. Pistonrings Three compression
rings, oneoil scraper ring.
13. Piston
pin Float type.
\
3

Part Description & Speciacations
14, Connectingrod I-section, stamp forged.
15. Crankpin metal Drum type
16. Lube oil pump Trochoid pump, driven by camshaft.
17. Lubeoil strainers Iniet side: perforated steel t!?e.
Outlet side: auto-clean tlpe, full-flow passing tlTe.
18. Indicators Electric starting: hydraulic lamp
Manual startingr oil light
19. Lube oil circulation
chart nlet side strainer
rochoid pump
Outlet side strainer
Main bearing metal (flywheel side)
Valve rocker arm chamber
Mainbearing
metal(gear
caseside
Crankpin metal
20. Coolingwater pump Rotary type (belt-driven from power take-off shaft)
21. Fuel itrjectio! pump Yanmar-Dickel type pump
22. Fuel injection nozzle Pintle nozzle
Fuel strainer FiIter paper
24. Fuel tank Steel plate
25. Governor Centritugal, all-speed tJpe
=t
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Part Description & Specifications
26. Governor remote
control device Remote control wiTe, steel lever
27. Decompressionremote
control Remote control wire, steel lever
28. Electric starting
devic€ Starter (!iog geartlpe)
Output:1.0KWat 12 v
Battery:40-?0
AH
(nomirlal)
29. Manualstarting
de\rice Speed-upchain
Speed-upratio:
(onstern or bow side)
2.07
(YSE8),2.91
(YSE12)
30. Rever8ing clutch Wet t ?e siDgleplate disc clutch
31. Reduction gear Constantmesh spur gear type
Reduction latio: 2 : \, 3 : 1
32, Power take-off shaft
pulley Spur gear-driven
alternator and forfrom crank gear with pulleys cooling water pump. lor
-1I
i
3.2 PowerTakeoff ShaftPull.ys
The outside pulley is for the alternator and the inside pulley for the cooling water. If the
alteinator is not attached, the outside pulley can be used as desied to drive a bilge pump,
(Remark) The flexible mounting being on engine,not using P.T.O. shaft.
-5
/
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Model YSE8 YSE12
PTO shaft rotation speed/enginespeed 4100/3200
rpm 3380/30oo
rpm
Outside diameter oI pulley 90
mm 110mm
V belts Single HM type Single
HM tYP€
PTO max. permissible outputpower r-t.s/32o0 HP/rpt! 2-3l3ooo
HPl4m

4. PER]ODICALMAINTENANCE
, -**r
No. Hours of opemtion
100 !verY 250 500
IFuelOil 1. Checktlel oil level, and
supply luel, if necessary. a
2. Discharge drainage {rom a
L Clern fuelstr3iners. o
4. Renes the fuel st.liner
filter elements. a
21. Check lube oil levels in
cftnkcase and reduction
Sear case, anosupprJ
lube oil, if necessary. a
2. Lubricate the sarting shaft,
chaih. and other Darts. a
3. Tun tbe lube oil shaine.
L O"e.h^l tn" Itb..il aa
6ReneN
crankcaselubeoil.
Renan
Clnrch-aa-nb Ia
3l. Dis.harge
cooiing
qarer
alte. ottrarion in cold a
2. Chec\ the recirculated
condition of c@ling wate.. a
4l. Checkfuel injeciion
(iniection noise). a
2. Adjust th€ govemor
3, Check fuel injection timing.
t. al@n the;;;,Ie. a
a
5cylinder Eead l. RetightcD the cvlinder a
2. Adjustih€ intake/exhausr a.
3. clean the intemal surfaces
of combustion chamber. a
l. Clean the pre-cohbuslion a
5. Checkth€mtake/exhaust a
6. Cbeckvalve rocker alrn and o
6
Rrnc
1. Wash the breather valve. a
2. Checkthe belt tensions
(coolingsaler pump, a
3. Renewthe anticorrosive a
4. Check the piston and the
.ing. a
:;
\
6

5. FUEL AND LUBRICATINGOILS
To the engine, fuel oil is foodand lubricating oil is blood. Mis-handling might cause
unexpected
enginetrouble. The efficiency of the Yanmar enginewill dependupon strict
adherenceto these instructions andrecommendati
ons,
It is the salesman's or serviceman's duty and mission to urge the user to follow them.
5.1 FuelOils
5.1.! Propertyroquirsmsnts
il\ IIidh.afanp Tqfind
fl loor ignitability of fuel oil results in a ignition lag, causing difficult starting or
\l knockine.
I"
(2) Low sulphur content
Sulphur containediD fuel oil whenburned is combinedwiti water to produce
sulphuric acid v,/hich
corrodes metallic parts,
(3) No dust or moisture content
Dust andmoisture containedin fuel oil can causefaster wear or sticking of the
plunger of fuel injection pump andinjection nozzle.
(4) Appropdate viscosity
Fuel viscosity has a relation to the condition of injection, It shouldbe such that the
pluoger
andthenozzlevalvewill beproperly lubricated.
5.r.2 R*mmend b.ands
Supplie. BraIto
SHELL Shell Diesoline (or local equivalent)
CALTEX Caltex
Diesel
Oil
MOBIL Mobil Diesel oil
ESSO Esso
DieselOil
B. P. (British Petroleum) B.P. Diesel OiI
LubricatingOils
5.2.1 Functions
(1) Lubrication--reduces friction andwear ou sliding surfaces.
(2) Cooling--carries awaycombustion and{riction heat.
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