Yangdong Co. Y90 Series Spezifikationen PDF herunterladen (Seite 25)

the

diesel

engine,flush

all lube

oil

passages,and

be

sure

that

they

are

clean

and

unb

locke~.

All

passage

plugs

should

be

sealed

reliably

and

leakproof.

The

main

bearings

are

of

complete

suspension-

support

type.Since

the

main

bearing

caps

and

cylinder

block

are

matched

to

bore,the

matching

marks

are

both

on

the

bolck

and

main

bearing

caps.Misplacement

or

inverted installation,when

assembling,are

prohibited.The

main

bearing

shells

are

made

of

high-

tin

aluminium-base

alloy.

When

dismantling

for

cleaning,be

sure

that

the

upper

and

lower

bearing

shells

are

in

right

places(the

upper

shell

with

an

oil

groove).The

crankshaft

thrust

plates

are

assembled

on

the

last

main

bearing

with

an

upper

piece

and

a

lower

piece

on

each

side.The

thrust

plates

bear

the

axial force [roln

the

crankshaft.There

are

oil

channels

on

its

operating

surface

\\!hich

should

be

located

a~ainst

the thrust planes on the

crank,

and

its back

surface

is

smooth.Never

locate

therTI

in

reverse.When

tightening

the

nlain bearing

biots,t\\'O bolts

on

the

bearIng

cap

should

be

tightened

several

times

in

tl1rn.L~efore

tightening

the

Inain

bearing

cap,strike

the

crankshaft for\'vard and backw'ard in

order

to

keep

the

upper

and

lo\ver

thrust

plates in the saIne plane.

Then

tighten

the

bolts until they reach

the

specified

tightening torque.

When

cOlllpleting

the

c.rankshaft assemblY,turn it

at

the

flywheel

cnd

by

hand

to

check

\vhether it

can

be

rnoved freely.

l'he

Iiner is

slipped

into

the cylinder

bore

vertically so

that

deformation

of

the

liner

Inay

be

avoided.rrhe

liner flange

plane

should

protrude

out

the

top

plane

of

cylinder

block

by

0.07---

0.]

5

lTIln to keep

an

excellant

scaling

bet\vcen

the

cylinder

liner

aud

cylinder

head,as

shown

in

Fig6.

III

. Piston

and

Connectin2-rod

'The

piston

and

connecting-

rod

assembly

conlprises

the

piston~piston

rings,piston pin, re-

tainIng

f1n~:-

..

connecting-rod,connecting

rod

cap,connecting-rod

bolts

and

connecting-rod

bearing

shelts

and

bush,etc.The

lnass

difference

of

piston and

connecting-

rod assetllblies in

the

sanle

engine

should

be

vvithin

20g.

/\11

of

the

cOlnpression rings

are

made

of

alloy

cast

iron.l'he

outer

circle

surface

of

the

first

rin,g is plated with

porous

chronlC in

order

to

decrease

the

\\Jear

between

the

cylinder

liner

and

piston ring.rrhe

second

ring

has

a conical surface.

W·hen

assenlblinp,,,the

surface

rnarked with a

sign

II

Up"

should

be

kept

against

the

top

of

piston

and

be careful

to

avoid

assenlbling

in reverse.

The oil-control

ring

is

oftensionin~,

ring type.'The radial force

of

oil

ring

is still kept

while

decreasing

the elasticity

due

to

\vear:rhus the

service

life

of

oil

ring

is

prolonged.

5-3

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