Weifang 495 - Page 24

1 ). Injection timing is too -early
(The rhythmic pounding noise
ca,n be heard clearly during the
engine running at idling).
2 ). Clearance between piston
pin. and connecting rod sln.all
eIld
bushing is too large (A
clear metallic pou~nding :noise
emits from the upper portion of
thecylindet 'when.engine-.:·r-uns
at lo\v·speed:·'''or when :entgine
speed or s'uddenly drops to the
idling) .
3 ) • 'Valve pou·nd·s' the piston
top~A d.ull·cilcking noi~e emits
from joirlt surface of cylinder
and cylinder head, it will be
ev
7
en louder if the valve 'lash is
reduced." ' i'~
4 ). Connecting rod bearing or
main rearing clearance:'~ is,-to'Q
large or Olle of these bearing. is
damaged. (1~he citll!, pounding
noise em.its from the lower por-
tion of cylin(ler block).
5 ). Valve tash·es ~:'are 'toq·r·large
(The rtlythmic ciIcking noise
ca-nbe 'heard . clearly above: the
cylinder head).
Check and adjust thefuel1njec-
tion timing.
Replace the 'connecting: rod
small end bushing.
Inspect,the.,~ valve; lashes': ','and
'check the'valve tim1fig.~·;
... ' ~
Replace the connecting rod
bearing or ,main)bea:ritig~,-~, "
103