Insufficient Engine Output - Weifang 495 Operation And Maintenance Manual

3 ).
,The
engine~
:emlts dens'e
'black smo.ke .to --- get'hel: with
shrill pounding noise.
.'r-he' :::nozzle - '8ssem bly IS
,'.S
tuck
'seri0USly.
4 ).'
,A
,hiss comes
'frODl~~
the in-
·take
manifbld (,It can cll.e hea:td
'clearly:~_in
the:.engiDe running:.at
idling).
The valve leaks.
'5)~
Engine runs unsteadily·
The governor
is.·,not,
so sensi:-
tive.
Adjust valve lash or lap the
valve.
Send
it\~o,
-
~ ~er:Vl~,e wor~shq,p
f9f·
.check apd
~epair.
"3. Insufficient Engine Output
Abnormality
&.
Cause
1 ') • Insufficient Compression
pressure in cylinders
(l)V'alv.e---spring breaks.·
'( 2 ) Valve lash
f
is too small or
even'·becomes-.to
-zero.
(3)The valves leak.
'100
Remedy
¥(
1 ). C,rank _
t.h~ e.ng~ne tQ ~:et
the
piston reach its T. D. C., ,and
then replace the spring
(2)Adjust thevalve,lash,
(3)Lap the valves.