Yangdong Co. Y90 Series Spezifikationen PDF herunterladen (Seite 27)

2

Fil.

7

Meuurement

of

piston ring end

gap

1.

Tbldmess

leeler(puge)

2. Piston

ring

3. CyUnder IiDer

Fig. 8 Measurement

of

slde surface

gap

of

piston ring

Check

the

ring

end

,gap before

assemblinJ!.

the

pi,st()~

ring.~rhe

method,

Ineasuri~g

this gap is .reconlmended as

follows:Press .down

the

piston ring

evenly into

the

cylinder

Jinerby

15---

20mm

ft:Q~the

top

surfa~e

of

liner.

Measure

the

clearance with a feeler

gauge.In nonnal- case,the

meas;urin~

value should

be

O.2·--0.4mln(Fig.7).ln

case

the

gap

value

is less

..

enlarge

it

by

a fi.le.lf

it,

is excess.,repJace

it

\vith

another

one.ln

addition.,ineasurement

should

be

made

with a feeler(gauge)to

check

the

side

clearance

between

the

·piston ring and

r~ng

groove.

The

side clearance for

the

first ring

should

be

O.07~O.1

02mm

and

o.

05.--..0.082mm

for the

second

ring as

shown

in FiRS.

When dismantling and asselnbling

the

piston ring,a special tool

may

be

lIsed.

The

ring

end

gap

of

piston rings should

be

set

off

with

each

other

by

J

20

ljC

to

prevent

being

in

line with the piston pin

seat hole.

If

the

piston

rin1~

is seized and could

not

nlove

when

'checking,soak it

in

diesel fuel(kerosine

or

gasoline)for

24h

or

more.Then knock

the

piston ring slightly

to

~ake

it

become

flexible

of

itselt:On getting

out

the

piston ring.,clean it in diesel fuel

or

carbon

tetTal~hloridec

Check

the piston to see

whether

there is

any

cracks

or

scars.Change

the

defective piston

and

rene\v

itsrin~s.

The

cross section

of

the

connecting- rod is

1-

shaped"with

the'splitting

surface

of

large

end

being perPendicular

to

the

center

line

of

connecting- rod.Boring

the

connecting-

rod

hole and

connecting-rod

cap

must be mated.Therefore \vhen asselnbling"pay

close

attention

to

the

matin~

5-4

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