Yanmar YM276 Service Manual page 464

220-052 System Operation
LUBRICATION SYSTEM
A
-
Oil Pump E
-
Oil Pr.rrumSendinp Unit
-
Pnuure Free Oil
B
-
Filter F -Main Bsarinp.
7 1
Pnuuw
Oil
C
-
Oil Pmrure R.pulatmnp Valve
G
-
Connna'ng Rod & u r i
D
-
Oil Filter
Bv-PDI
Val-
The engine lubrication system consists of a trochoid rotor-
type pump (A), oil filter (B), oil pressure regulating valve
(C), and oil filter bypass valve
( 0 )
(within oil filter).
Oil i s pumped from the oil pan by the engine oil pump
to the filter. Parsing through the filter, oil continues on
around the filter by-pass valve and in front of the oil
pressure regulating valve. Oil is then distributed, under
pressure, to each main bearing
(F)
and on through cross
drilled passages in the crankshaft t o connecting rod bearings
(GI.
An external line carries oil from the rear o f the engine
oil gallery t o the wlinder head t o lubricate rocker arms
and valves. Oil run from external line is divided a t the
top of cylinder brock toward camshaft middle bearing
journals t o lubricate camshaft. Oil r u n o f f from the
cylinder head splash lubricates camshaft and tappets.
Piston pin bushings are also splash lubricated by crank-
shaft rotation.
-