Robin EC12 Manuel utilisateur

SERVICE

MAIINJAL

Model

EC12

OIL MIX &OIL INJECTION ENGINES

puB-Esl173

Rev. 8/98

CONTENTS

Section

Title

Page

4-1

4-2

4-3

4-4

4-5

4-6

4-7

4-8

4-9

4-1

MODEL

Type

Number

cylinder,

Bore

Stroke

Piston Displacement

Continuous

Horsepower

Max.

Toque

Direction

Rotation

Fuel

Consumption

Lubricant

oil

Lubrication

Carburetor

Method

ignition

spark

Plug

Starting System

Governor

Air

Cleaner

Dry Weight

Length

Dimensions Width

Height

ECIPD

STD.,

EC12D

OIL

INJECTIONSYSTEM

Air-Cooled, 2-Cycle,

-Cylinder, Gasoline-Engine

mrn

(2.13

1.97

in)

14cc

(6.98

cu.in)

(3.0

HP)

3600

rpm

2.9 kW

(4.0

HP)

I4000

rpm

7.5

N-rn

(0.76

kg-m

)

I3000

rprn

Counterclockwise

viewed

from

PTO

Shaft

Automobile Gasoline

(Mixed

with

Oil.

Mixing

Ratio

50:l)

Automobile Gasoline

360

HP.

3.0

HP/

3600

rprn

2-Cycle Engine

Oil

Gasoline

Oil

Mixing Type

(Mixing

Ratio

50:l)

O~I

separatefuelingsystem

Float Type

Flywheel Magneto

Type

(Solid State Ignition)

NGK

BMGA

CHAMPION

CJ8

~ ~ ~

Recoil Starter

12.0

(26.0

Ibs)

273

mrn

(10.7

in.)

326

rnrn

(12.8

in.)

307

rnm

(12.1

in.)

-1-

2-1

MAXIMUM

OUTPUT

The maximum output

the output

an engine with its throttle valve fully opened under the condition

that all the moving parts are properly

worn

in after the initial break-in period.

new engine may notproduce full maximum output while its movingparts are still

not

broken-in.

2-2

CONTINUOUS

RATED

OUTPUT

The

continuous rated output

theoutput

engine at optimum

governed

speed which is most

favorablefrom theview point

engine’s life andfuel consumption.

When the engine

installed on

certain equipment, it

recommended.thatthe continuous output

required from the

engine

kept below thiscontinuous rated output.

2-3

MAXIMUM

OUTPUT

The maximum torque is the torque at theoutput shaft

when

the engine

producing

maximum output at

certain revolution.

-2-

2-4

PERFORMANCE

CURVES

(kgf-m)

-0

2000

3000

4000

5000

REVLOUTION

r.p.m.

FEATURES

3-1

COMPACT,

LIGHT

WEIGHT

AND

HIGH

POWER

Compact and light weight enginethanks to

short

connecting rod and aluminum cylinder.

3-2

SUPERB

DURABILITY

Rugged design on each enginecomponents and employment

high

anti-vibration dust cover enable

a long lasting durability even

harsh applications.

3-3

SfMPLE

STRUCTURE,

EASY

MAINTENANCE

Maintenancefree and

high

vibration proof

have

been achieved

thanks

to the crankcasebuiltin

governor system.

Easy

start

with decompression

hole

exhaust system.

SUITABLE

FOR

REPLACEMENTENGINE

Robin

EC12

engine has the identical mounting flange

EClO

engines. Without

any

modification on

your equipment,

EC12

engine

can

replace

EClO

engines.

3-5

OIL

INJECTION

SYSTEM

(OIL

INJECTION

TYPE)

Oil

and gasoline are placed into separate tanks. Therefore, mixing the fuel/oil which

often

can

troublesome, is

now

done automatically

engine function.

Because thefuel

gasoline, the

start

ability

the

engine for the reason

can

be improved.

Since

only

gasoline

in the carburetor, there

will

jet choking due to the deterioration

oil.

Themixture ratio has becomeleaner, which will decrease white smokeduring operation.

GENERAL

DESCRIPTION

ENGINE

COMPONENTS

4-1

ALUMINUMCYLINDER AND CRANKCASE

Aluminum die-cast cylinder with molded-in cast

iron liner has intake, exhaust

and

scavenging

ports

on the liner. For easy starting, decompression hole

is implemented on the exhaust port.

Crankcase is divided into two pieces

crankcase

(Flywheel

side) and crankcase

(P.T.O.

side).

Governor chamber

built in

the

crankcase

and

gasoline-oil mixture fuellubricates the governor

system.

Fig.

4-7

-4-

4-2

CYLINDER

HEAD

Alumin’um die-cast made cylinder head has semi-

sphere shaped combustionchamber

for

optimal

combustion and higher efficiency.

CRANKSHAFT

AND CONNECTING

ROD

Forged steel crankshaft assembled with hardened

crank

and

connecting rod, precision balanced

for low engine vibration, durability, greater shock

loading resistance

and

longer life. Needle bearings

are implemented

both

ends

the connecting

rod.

these

parts

are

press-fitted together

special

jig

and

are

unable to be disassembled,

crankshaft assembly

needs

be serviced

case

crankshaft

connecting rod need to bereplaced.

4-4

PISTON

AND

PISTON

RINGS

High strength aluminum alloy made

piston

equips

two

piston rings.

avoid piston ring rotation,

knocks arepressed

piston ring grooves.

Top

ring is key-stone type and is chromium plated.

Secondring isa plain type and

parkerlized.

Fig.

4-2

fig.

4-3

Top

ring

Key stone

type

Chromium

plated

Plain

type

Parkerlrized

-5-

4-5

ALL

SPEED

GOVERNOR

Rapid response mechanical flyweight type

gov-

ernor system

fully lubricated with oil mixed fuel

for

long'

life and which enables more precision

speed regulation

and

better reliability.

4-6

COOLING

SYSTEM

Forced air

cooling

is done by flywheel

fan.

Alu-

minum die-cast flywheel fan ensures better cool-

ing and durability.

Fig.

4-6

4-7

CARBURETOR

EC12

equipped with

horizontal draft carbu-

retor that

has

a float controlled

fuel

system and a

fixedmainjet. Carburetor is calibrated carefully

for easy starting,

good

acceleration, low fuel

con-

sumption

and

sufficient output.

Fig.

4-7

-6-

4-8

AIR

CLEANER

Rugged semi-wet dual stage air cleaner with high

efficiency,ease

service

and

longer enginelife.

4-9

IGNITION

SYSTEM

Solid state, high 'energy electric ignition

which

referredto

(TransistorControlled Igni-

tion) gives moreprecise ignition timing,

break-

erpoints

service,ease

maintenance and

longer spark.pluglife. Ignition system

consisted

flywheel

magneto and

ignition

coil.

Flywheel

installed

crankshaft

and

ignition coil is

crankcase.

Ignitiontiming

BTDC.

(Before

Top Dead Center)

4-10

OIL

INJECTION

SYSTEM

The

oil

injection system

a device that uses

oil

pump

directly

driven

crankshaft

to forcefully

feed

lubrication

oil

the

airintake

port

cylinder.

Accordingto engine speed, the appropriate amount

oil is measuredand fed.

Element

Fig.

4-8

Fig.

4-9

Fig.

4-10

-7-

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