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cause the rhythmic

and

clear metal-

aAgle

lic pounding noise be heard inside the

cylinder.

(2)

Injecting time

too late to cause 2. adjust the fjel delivery advance angle

the grave

and

unclear noise

heard

in-

side the cylinder.

(3)

Pounding noise

can

heard inside 3. Check the cylinder clearance, replace

the cylinder after

the

engine starts

be-

the piston or cylinder liner

cause of too large gap between the pis-

ton

a,nd

cylinder liner, this noise gets

lower along mith the warming of the en-

gine.

(4)

Too

large.

clearance 'between the pis- 4. Replace the parts,

ass

ure the stipula-

ton

and

pinhole, clear

and

sharp ted gap

sound, especialy when idling.

) Too large clearance between the

main bearing

and

the con -

rod

bearing,

Replace the parts, assure the stipula-

parts pounding sound

heard when the ted gap

engine speed drops suddenly, grave

and

strong sound when at

low

speed.

(

The axile gap of the crankshaft

too

Replace the thrust plate, assure stipu-

large, pounding noise when idling. lated

gap

(7)

Valve spring broken, push

rod

bent,

valve clearance too large

and

on, dis- 7.

Replace

the parts,adjust valve

gap

orderly sound or lignt

and

rhythmic poun-

ding sound

heard inside the cylinder

head cover.

( 8) Piston touches valve, metallic poun-

Check valve clearance

and

transmitting

ding sound

can

heard qeside the cyl- gear mark

inder head

) Too large gear clearance, pounding

Test the gear back lash, replace gear

sound

heard at the gear case when according to the situation

the speed

· 54 •