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3.Pressure relief valve
(1)Check the valve seat for contact.
Check the spring for damage.
(2)Measure the oil pressure at which the
relief valve opens (the oil pressure with
the engine running at the rated rpm).
If the pressure is not correct, remove the
cap nut increase or decrease the amount of
shims. The engine oil pressure tap is
located on the right side of the engine.
Relief valve 3.5 0.5kgf/cm
2
opening pressure (50 7psi)
[343 49kPa]
(5)LUBRICATION SYSTEM
1.Oil pump
Visually check the pump for rough rotation or
other defects. Replace the pump assembly if
defective.
2.Oil pressure switch
(1)Test for continuity between the terminal
and body with an ohmmeter as shown in the
illustration. No continuity is the cause for
replacing theswitch.
(2)Insert a small diameter bar into the oil hole
in the switch and lightly push it in to test
for no continuity as shown in the illustra-
tion. Any continuity is the cause for
replacing the switch.
(3)Apply a pressure air of 0.5kgf/cm
2
(7psi)
(49kpa)to the switch through the oil
hole to test for no continuity.
Any continuity is the cause for replacing
the switch. Also, check for air leaks.
Any air leak is an indication of a ruptured
diaphragm. In such a case, replace the switch.