Lubrication System - Yanmar 3JH4E Service Manual

8. Lubrication system

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.
The oil pressure is regulated by the oil pressure regulating valve equipped with the lube oil pump.
The lube oil, which flows from the holes in the cylinder body to the lube oil cooler, is cooled and sent to
the lube oil filter. After being filtered, it is fed to main gallery in the cylinder body.
The lube oil, which flows in the main gallery, goes to the crankshaft journal, lubricates the crankshaft
journal and crank pin, and a option of the oil is fed to the camshaft bearings.
Oil is sent from the camshaft bearings to the rocker arm shaft to lubricate the rocker arm and valves.
Oil is also sent from the main gallery to the piston cooling nozzle to cool the piston.
Oil for the fuel injection pump and turbocharger(4JH4-TE and 4JH4-HTE) is sent by pipes from the main
gallery to those parts.
Oil pressure
regulating valve
Lubricating oil pump
Lubricating oil filter
Lubricating oil cooler
Lubricating oil filter
Oil pressure switch
Cylinder block main gallery
Idle gear shaft Cooling oil nozzle
Idle gear face Piston
(bypath)
Turbocharger
Cam shaft bearing
Valve rocker
arm shaft
Valve rocker arm
Tappet and cam face
Oil pan
252
Fuel injection pump
Crank journal
Crank pin
010542-00E