SCORPION 1975 Brut Manuale utente

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(/"-

)

1975

Scorpion

Brut

Service

Manual

Engine

Section

1-l

SERVICE

MANUAL·

1975

SCORPION

BRUT

ENGINE

SYSTEM

General

Description:

The

Scorpion

Brut

gine

especially

designed

and

built

for

today's

high

performance

snowmobile.

Any

internal

combusion

engine

performs

best

and

most

reliable

constant

operating

tem-

perature.

The

Scorpion

Brut

engine

ther

mostatically

controlled

run

180

degree+4

degree

cylinder

head

temperature

whether

the

outside

temperature

-30

degree

+50

degree

This

temperature

control

reduces

minimal,

the

necessity

changing

spark

plugs

and

the

worry

piston

seizing.

However,

order

get

the

best

possible

use

and

ensure

that

retains

its

high

degree

dependability,

performance

and

endurance,

must

receive

proper

care

and

maintenance.

Therefore,

necessary

know

something

about

the

basic

fundamentals

this

engine

and

how

functions

OPERATION

The

Scorpion

Brut

engine

uses

mixture

gasoline,

oil

and

air

for

combustion,

lubrication

and

cooling

fires

every

strok

each

piston.

There

are

two

three

power

strokes

(depending

the

model),

for

every

revolution

the

crankshaft.

the

piston

moves

upward

the

cylinder,

draws

the

fuel/air

mixture

into

the

crankcase

through

the

intake

manifold

while

the

same

time

compressing

fuel

that

has

been

forced

into

the

combustion

chamber

(Fig.

1-1

A).

the

piston

nears

top

dead

center,

the

spark

plug

fired

and

the

compressed

fuel/air

mixture

burns

and

expands,

thereby

forcing

the

piston

downward

power

stroke.

the

downward

stroke

the

piston

turns

the

crankshaft,

starts

compress

the

fuel/air

mixture

the

crankcase

and,

simultaneously,

opens

the

exhaust

and

closes

the

intake

por

(Fig.

1-1

B & C).

1-2

)

After

the

exhaust

port

fully

open

and

the

intake

port

fully

closed,

further

piston

travel

starts

open

the

transfer

ports.

The

compressed

fuel/air

mixture

from

the

crankcase

travels

the

transfer

ports

and

into

the

combustion

area.

After

most

the

burned

exhaust

gases

have

left

the

cylinder,

incoming

charge

fuel/air

mix

ture

scavenges

the

combustion

area

giving

fresh

charge

and

the

cycle

then

repeated.

(Fig.

1-lD).

Because

lubrication

dependent

the

mixing

oil

and

fuel,

extreme

important

that

good

quality

oil

and

gasoline

are

properly

mixed.

The

proper

ratio

oil

gasoline

will

prevent

possible

engine

overheating,

piston

lind

scoring,

eventua

engine

seizure.

Too

much

oil

and

not

enough

gasoline

can

lead

incomplete

combustion,

fouled

pl'-'gs,

carbon

build-up

and

muffler

clogging.

SERVICE

MANUAL

1975

SCORPION

BRUT

INTAKE

EXH/UST

TRANSFER

FIG.

1-1

1·3

SERVICE

MANUAL

1975

SCORPION

BRUT

TABLE

SPECIFICATIONS

IDENTIFICATION

SIZE

TORQUE

Cylinder

ead

Nuts

8mm

20Ft.

lbs.

Cylinder

Base

Nuts

25Ft.

lbs.

Flywheel

Nut

Ft. lbs.

Intake

Manifold

Nuts

8mm

20Ft.

lbs.

Exhaust

Manifold

Nuts

8mm

20Ft.

lbs

Wat

Manifold

Nuts

6mm

15Ft.

lbs.

Crankcase

Bolts

8mm

20Ft.

lbs.

25Ft.

lbs.

CRANKCASE

BOLTS

TORQUE SEQUENCE

•

Bolts

Circled

• • • • • • • •

15 11 7 3 1 6

All

others

are

e18

•

13 9 5 2 4 8

• • • •

••

• • •

•

440

Brut

shown.

Use

the

same

torquing

pattern

for

the

340

Brut

which

has

instead

18 - 8

bolts.

CYLINDER HEAD NUT TORQUING SEQUENCE:

340,

440

Models

1-4

(1)

(

ENGINE REMOVAL

Separate

the

carburetors

from

the

engine

removing

the

clamps

which

secure

the

rubber

connectors

the

carburetor

outlet.

Remove

the

3/8"

nuts

which

fasten

the

tie

rod

ends

the

steering

frog.

Remove

the

cotter

key

from

the

lower

end

the

steering

frog.

Remove

the

2lf4"

bolts

which

secure

the

upper

steering

brack-

the

roll

bar.

SERVICE

MANUAL·

1975

SCORPION

BRUT

CLAMPS

FIG. 1·2

CARB.

ELBOW

MOUNTING

SCREWS

FIG. 1·3

STEERING

FROG

TIE

RODS

l-5

SERVICE

MANUAL·

1975 SCORPION

BRUT

Lift

the

steering

post

clear

the

engine

area.

UPPER

STEERING BRACKET

Disconnect

the

engine

electrical

connectors,

spark

plug

leads

and

the

temperature

light

wire

from

heat

sensing

element.

SENSING

ELEMENT----+-----=

CONNECTOR

1·6

FIG.

1·4

FIG. 1-5

FIG. 1-6

(

Disconnect

the

coolant

hoses

from

the

manifolds

and

plug

both

manifolds

and

hoses

reduce

coolant

spillage.

COOLANT

BY·

PASS

HOSE

SERVICE

MANUAL·

1975

SCORPION

BRUT

FIG. 1-7

FIG. 1·8

HOSE---I

1-7

SERVICE

MANUAL·

1975 SCORPION

BRUT

Remove

2-7

/16"

lock

nuts

which

secure

the

front

motor

mounts

the

chassis.

Remove

the

6 - 8

screws

which

secure

the

rear

motor

mounts

the

engine.

Release

the

springs

which

fasten

the

exhaust

wye

the

muffler

lift

the

engine

from

the

led

and

drain

the

coolant.

ENGINE

DISASSEMBLYI

ASSEMBLY

Disassembly

(Peripheral

Equipment)

Remove

the

carburetor

engine

Elbow

connectors.

socket

head

screws/elbow)

See

Fig

. 1-

Disconnect

the

exhaust

wye

(Socket

head

screws).

Disconnect

the

coolant

pass

hose.

clamps).

See Fig. 1-7.

l -8

FIG. 1-10

Remove

the

coolant

inlet

and

outlet

manifolds.

nuts).

Disconnect

the

water

pump

mounting

brackets.

(3 - 8

bolts).

6. R

emove

the

front

motor

mounts

from

the

engine.

SERVICE

MANUAL·

1975

SCORPION

BRUT

COO~ANT

COOLANT

INLET

MANIFOLD

OUTLET

MANIFOLD

FIG. 1-12

FIG. 1-13

1-9

SERVICE

MANUAL·

1975

SCORPION

BRUT

Engine

Disassembly

Remove

heads.

Remove

nuts

per

head).

Pry

carefully

separate

heads

from

cylinder.

Remove

cylinders.

].]

Remove

cylinder

nuts.

Slide

cylinders

off

pistons.

FIG. 1-14

~---

HEAD

NUTS

FIG. 1-15

CYLINDER

NUTS

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