6-
4-
2
OPERATION
1.
STARTING
When the speed control lever is set to the high speed (start) position, the governor
lever is pulled by the governor spring through the control link. The control link
compress the smoke set spring at the same time to allow the injection pump to deliver
extra fuel for starting.
/-
2.
OPERATION
UNDER
LOAD
When the engine starts up, the flyweights expand by the centrifugal force pushing
the governor sleeve. The governor lever pushed by the governor sleeve moves
to
push
the control rack of the fuel injection pump in the direction of reducing fuel.
Thus, the engine speed rises up to the predetermined level, and maintains this speed
where the centrifugal force balances with the tension of the governor spring.
When a load is applied to the engine, the engine reduces
its
speed
for
a moment.
At
this moment, as the centrifugal force
at
the flyweights is weakened, the governor
lever being pulled by the governor spring moves to push the control rack of the fuel
injection pump in the direction of increasing fuel. Thus, the engine recovers its speed
to the predetermined level. When the load is reduced
or
removed, the governor’ system
operates exactly in reverse to maintain the engine speed.
When the engine is over-loaded, the control link touches the smoke set. However, the
tension of the governor spring is weaker than the combined force of the centrifugal
force
of
the flyweights and the smoke set spring, the governor iever can not move
further to increase fuel. Under this condition, the engine speed is reduced and the
engine exhausts black smoke.
3.
STOPPING
By
pushing the stop lever, the governor lever pushes the control rack
of
the injection
pump all the way
to
“fuel shut off” position to
stop
the engine.
/-
6-5
LUBRICATION
SYSTEM
AND
OIL
PUMP
Forced lubrication system is adopted to
DY23
and
DY27
engines. The trochoid type oil
pump
is
mounted on the .main bearing cover co- axialy with the governor gear and is
driven by the cam gear.
The
oil
in the oil pan
is
filtered by the oil filter and is forcibly delivered by the oil
pump to the crank jounal and then to the crank pin lubricating the main bearing and
the large end bearing.
The oil splashes from the crank journal and the crank pin
to
lubricate cylinder wall,
piston, small end, cam shaft and the governor system. The rocker arms, valve system
etc. inside of the rocker chamber are lubricated by the oil mist contained in the blow
-by gas supplied from crankcase.
The blow- by gas enters into the combustion chamber through the breather valve, and
the
oil
contained in the blow-
by
gas
is
finally burnt out.
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