Weifang 495 - Valve Timing Diagram

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'\

.

der

to

keep

the

valve

timing

as

required,

the

valve

lashes

should

be

adjusted

to

the

prescribed

valve.

'Intake

valve

Opens

Direction

of

Rotation

Intake

valve Close

,1

"

i

,

I

---

\

Exhaust

valve

closes

Exhaust

valve

opens

Fig.

5

Valve

timing

Diagram

2).

Maintenance

of

Cylinder

Head

and

Valve

Gear

(l)Adjusting

Val.ve

Lash

Adjusting

method:

Turning

the

flywheel

to

let

the

piston

of

the

first

cylinder

moving

up

to

the

top

dead

centre

in

its

compres-

sion

stroke.

(When

the

top

dead

centre

mark

"0"

on

the

flywheel

in

aligned

with

the

line

marked

at

the

side

of

the

opening

on

the

flywheel

housing

,the

pistons

of

the

fJrstand

fourth

cylinders

are

at

their

top

dead

centre

positions.

If

the

exhaust

valve

of

th.e

sec-

ond

cylinder

opens,

the'

piston

of

the

first

cylinder

is

in

the

mean-

time

Just

a~I~.top

dead

centre

in

its

compression

stroke.)

Loosen

the

~

,

locking

nuts

of

adjusting

screws

on

the

rocker

arms

of

both

th.e

in-

take

and

exhaust

valves

on

the

first

cylinder

of

the

intake

valve

on

the

second

cylinder

and

of

the

exhaust

valve

on

the

third

cylinder,

26

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