Yanmar 4JH2E Service Manual page 186

Chapter 5 Lubrication System
2. Lube Oil Pump
~~--~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~4JH Series
2. Lube Oil Pump
2· 1 Lube oil pump construcfion
The trochoid type lube oil pump is mounted on the gear
case side engine plate, and the rotor shaft gear is driven
by the crankshaft gear.
The lube oil flows from the intake filter mounted on the
bottom of the cylinder body through the holes in the
cylinder body and engine plate, and out from the holes in
the engine plate and cylinder body to·the discharge filter.
The lube oil pump is fitted with a pressure regulating
valve which maintains the discharge pressure at 3kg/cm'.
Intake
Outer rotor
\Inner rotor
Cylinder body
Gasket
Gear case flange
Printed in Japan
AOAJ029·9002
5-3
Lubricating oil pump
Gasket