Yanmar 3YM30, Service Manual

Page: 173 / 231

8. Lubrication system
152R1
8. Lubrication system
8.1 Lubrication system
The lube oil in the oil pan is pumped up through the intake filter and intake piping by the lube oil pump,
through the holes in the cylinder body and on to the lube oil pump, through the holes in the cylinder body
and on to the discharge filter.
The lube oil, which flows from the holes in the cylinder body through the bracket to the oil element, is
filtered. The oil pressure is regulated, and lube oil is fed back to main gallery in the cylinder body.
The lube oil which flows in the main gallery goes to the crankshaft journal, lubricates the crank pin from
the crankshaft journal, and a option of the oil is fed to the camshaft bearings.
Oil is sent from the gear case camshaft bearings through the holes in the cylinder body and cylinder
head to the valve arm shaft to lubricate the valve arm and valves.
Oil is also sent through the intermediate gear bearing (oil) holes to lubricate the intermediate gear
bearings and respective gears.
Lube oil for the fuel injection pump is sent by pipe from the main gallery to the fuel injection pump.
Lube oil filter
Bypass valve
Oil pressure
swich
Intermediate
gear shaft
Regulator
valve
Lube oil pump
Oil suction pipe
(strainer)
Camshaft
metal
Rocker arm
metal
Rocker arm
Tappet
Cam face
Crank
pin metal
Crank
journal metal
Fuel injection
pump
Cylinder block Main gallery
Oil pan