A d j u s t m e n t and Test.
(1) Pressure relief valve adjustment.
O i l pump has two halves. Front half of pump
b e h i n d drive shaft is called pressure pump.
P r e s s u r e pump pumps oil from deep sump of
engine oil pan to engine main oil gallery.
R e a r half of pump is called scavenge pump.
Scavenge pump pumps oil from shallow sump
in engine oil pan to deep sump in engine oil
( a ) Pour some engine lubricating oil into scavenge pump so scavenge
p u m p impellers will not be damaged during test.
( b ) Hook oil pump to test bench as shown in figure 4-2. Join oil inlet
h o s e and oil outlet hose to pressure half of pump. Check that you can see pressure
r e l i e f valve hole in pump.
Typical Oil Pump Test Setup.
(c) Open pressure restrictor valve all the way.
Set drive unit to
turn pump at 1,000 to 2,000 rpm.