Weifang 495 - Page 69

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the

per

-nlissible

limit,

it

should

be

renewed.

.

On

tile

joint

face

~Jf

each

bearing

half,

there

is

sheared

locating

lug

which

is

just

to

be

set

into

the

locating

slot

on

the

bearing

housing

to

prevent

the

shell

from

axial

nlovement.

The

main

bearings

can

be

classifie~·

il1tO

two

groups

i1,::cording'

to

tlleir

width.

The

first

and

the

fifth :tIiain

bearing-are

wider

while

the

second,

the

third

and

th'e

fourth

main

bearirlgs·are

narrower.

The

main

bearing

upper

halv'es

are

also

different

from

the

lower

halves.

The

one

provided

with

an

oil

hole' is

the

upper

half.

All

the

connecting

rod

bearing

halves

are

the

same

in

struc-

ture

and

size

.

.In

order

to

let

the

crankshaft

taking

axial

load.

the

thrust

riIlgs

are

fitted

011

both

sides

of

the

fifth

main

bearing

housing.

'There

are

two

oil

grOO\TeS

on

the

side'

of

alloy

layer

of~ach

thrust

ring,

wh";ich

shc)uld face

to

the

cra~kshaft

slloulder

arid

never

put

the

inside

surface

out~t'vard.

.

The

main

bearing

caps

and

conne.cting

rod

caps

are

fastened

by 11igh

strength

bolts

.tig11tened

with

specified

torque

and

locked'

by

lock

.tab find

lock

\vires

respectively.

Both

the

front

and

rear

ends

of

the

crankshaft

are

sealed

by

means

of

two

rubber

seals.

In

order

to

make

the

sealing

more

reli-

able

,an

oil

slinger

is

mOllnted

ill

the

~ront

of

the

rubber

seal.

The

flywheel

is

tightened

onto

the

flang~

at

the

crankshaft

rea-r

end

b~f

six

high

strength

b~lts

and

located

angularly

by a

dow-

el

pin.

There

are

graduation

lines

of

2°

crank

angle

each

r;narked

on

the

outer

rim

of

the

flywheel,

presenting

the

top

dead

centre

and

the

advance

angles

from

10°

to'

30°

for

the

pistons

of

the

first

and

fourth

cylinders.

34

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