Weifang 495 - Preheater

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(5

)Preheater

The

.preheater·

installed

on

:the

ITlai-nair'

intaketna·nifold

is

of

201type.lts

'construction

is

shown

in

Fig,

..

33.'

Fig.

33

Preheater

1-

Me~aI

'gasket

and

isolate

gasket;

~~--

Metal

gask~t

and

isolate

gask'et

i

3'--'"

-'~

Nut;

4'-'

'-"

Terminal;

5

----~

i\.dapfer;

6---

Valve

<body; 7------·

::Needleva.Ive;

,8-----'

·....-···Resis-

tanee

vlIre

After

i~urlling

c,n

t11e

prehe,ating

-

startiIlg

switGb,;,

the'

valve

body

of

the

prehe,ater

heated

by

the

resistance

wire

will

elongate

to.

form

·a

clearance

between

the

conical

sealing

bands.

ofthe\falY'f;

body

and

its

needle

valve.

Comi?g

from

the

fu.el

tank,

the,

fuel

flowing

·into

the

valve

body

through

the

injector

return

pipe

is

heated

and

carburated.The

carburated

fuel

will

-be

ignite,d

,by

the

red

-~

hot

resistance

wire

during

it:

leavin·g·

the

valve

body.

The

fla.me

of

ignited

fuel

heats

,the

air

inside

the

airinta;ke-mariifold.

to

make

the

engine

start

easily-.

Afte'r

tlJrning

off

the

.s·witchc,~the,·

\ralv.e

body

contracts

and

the

needle

valve

colses

d'own

automatically.

After

the

circuit

is

switched

on

fO'T

I5'seconds

"the

ptdheater.

begins

to

spurt

flame.

It

is

notperlnitted'

to

switch'

on

the:

eire'uit

for

77

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