Weifang 495 Operation And Maintenance Manual page 101

a. The oil pressure gauge and its connectingrpipe:
b ..... f l-le screen of tIle sump strainer:
ce'The
oil filter element and preSStlre regulating valve:
d. ·The oil illiet and outlet pipes of the lubricating oil pump.
1'he clearances of the crankshaft bea.rings are to
bt~
cp.1ecked
only wheri the conlponeIlts mentioned above are proven without
being choked and getting looserled or other troubles ..
e. 1"he engine should be stopped immediately to inspect the lu-
bricating systenl
if
no oil pressure is found in its main ,oil passage.
;2).
Clearlin·g, Illspection and Adjustment of the Componel)ts
C.A)Inspection and !\.djustment of Lubricating Oil Pump
.tt\fter irIS taIling the rotors into oil pump' body, the axial play of
t11e rotors 1Nnicll can be adjusted
.by
c11anging the
thickness
of gas-
. ket between the pump
})ody
and the cover ,sh.ould be within
o.
03-
o.
lOmm. The backlash between the inner and ()uter rotors should
be
~Y"ithin
o.
()8~O.
21mm which may be measured by feeler gauge
af~er
instaliil1g tl1e rc)tors and shaft into the casing and it is not ad-
justable. If
this backlash is enlarged up to
o.
5mm. due to wear or
the amount of oil supply is not sufficient, the inner and outer ro-
.tors should be replaced in couple.
Special atterltion
sllould.
,be paid to that the dowel
pi~
fitted in
the inner rotor and' te pump shaft should not be loosen. Rivet the
dowel pin's both ends after pressing it into the pin hole so as to
preven.t it from displacement to damage the rotor.
' . A rellewed rotor couple should be able to rotate freely in the
pump body,other\Alise they should be checked for some
high
spots,
on their contact surfaces which ·may be eliminated carefully bya
fine ar)rasive stick.
The lubricating oil pump should be tested on a special test
66