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Lubrication System - Kawasaki H1 Shop Manual

H series.
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(2) Oil Pump
The
oil pump
is
a
plunger
type pump driven
by
the
oil pump gear
mounted
on
the
crankshaft,
and
it
is
used
to
supply oil
to lubricate the
engine.
The
amount of oil
pumped varies
both with the
engine
rotational speed and
with
the
length
of the
plunger
stroke,
controlled by
a
cam inside the
pump.
The
pump lever is ocnnected by a
control
cable to the throttle
grip
so that,
as the
grip
is
twisted,
the
pump
lever
moves,
turning the
camshaft and thereby
increasing the
oil
flow.
Fig. 449
shows that when
the
cam is turned
from the maximum flow
to
the minimum
flow
position,
the
plunger tip will strike
the
cam
with
less travel,
thereby
pumping
less oil.
Since
there
are
two
high points on
the
plunger
cam
face,
there
are two complate pumping cycle
for each
revo-
lution of
the
pulnger.
Stroke
Length
Control
@
On
the
scavenge
stroke
a small portion of the
fuel-oil
(Plus
air)
mixture being
drawn in through
the scavenge port, goes
through this
hole to
the
main
bearing
for lubrication.
In addition,
after
the engine is stopped the
gasoline volatizes from
the
fuel-oil
mixture
still
adhering to
the scavenge
port
wall, and the
oil that remains runs
down
the
scavenge
port
wall
and
into
the hole to
the bearing.
Of
the vaporized
fuel
mixture
that is drawn
into
the
crank
chamber, the
small
portion of
it
that
is
not
well
mixed
with
air
and vaporized
(that
is,
some of
the
oil) clings
to
the crankcase
walls,
crank
web, and
so
on,
and
from
there runs
down
to
collect in
the
bottom of the crankcase
as a liquid pool. Left
like
this, when engine
rpm
is
raised the oil would
be
thrown
around
and
find
its
way
into the
combustion
chamber,
where the
gas
mixture
now
made
excessively rich in oil would
cause
such problems as white smoke
in
the
exhaust.
To solve this
problem
before
it
occurs,
a check
valve
is
provided in
the
bottom of the
crank
chamber.
The
check
valve
not only lets
oil
be
discharged,
but it
sends
it back
to
the
main bearings
on
the crankshaft.
In other words,
when
the
crank
web
rotates, the
fuel-oil
adhering to
it
is
flung
outward
and
hits the
collected in the bottom of
the crankcase.
This pushes the
oil
down
there
through
the
check
valve and
through passages
to
lubricate the
main bearings,
and
the connecting
rod
big-end
needle bearings.
2)
Lubrication System
(H2-B)
The
lubrication system
used is the
Kawasaki
Injectlube. In
this
system,
oil
is kept
in
a separate
tank,
from
Which
it
is pumped
to
the engine by
the
oil pump
and
mixed with
the gasoline. The
rate
at
which
the
oil is
pumped,
which
varies
with
the needs
of
the engine, is controlled by engine
rotational
speed
and throttle
opening.
With
the
idle
lubrication that
results, engine performance
is vastly
improved, and the fresh,
high
viscosity
oil
supplied directly
to
the crankshaft bearings
and connecting
rod
big ends
increases engine
durability.
(I)
Oil passage
Fig. 450 is a diagram of the H2 lnjectlube oil
passages. The
oil input
to
the
pump is supllied
by
a
hose from the
engine
oil
tank,
and
the
oil
output of
the
pump
goes
to
the
carburetor
and
the
cylinder.
There are three
outlet passages for
oil injection via check
valve
into
each carburetor
froat chamber
to
mix
the
oil with
the
fuel.
The
oil from
the
last outlet
is divided among
three
passages,
each
passage leading
to
a
check
valve
installed
at
the rear side of a cylinder
from
where
the
oil
goes
to
lubricate
the connecting rod big
end
via
the
crankshaft
bearings,
oil holder
and
crank
pin, in
that order.
A notch
cut
into
the
big
end of
the connecting rod enables the
fuel/oil
mixture
to
reach
the
crank pin
and crankshafts
bearings.
In order
to
lubricate the
main
bearing
at
the
right
end, there is
a small
hole
in
the scavenge
passage
in the right
side
of
the
crankcase,
and
this
goes through
to
the
right main bearing.
NOTE:
The
(A) & (B) marks
refer
to
the letters
in the illustration and
do
not appear on
the vehicle
itself.
.Set
up
a strobe light, connecting the
two
leads
to the
battery
and the single lead
to
the left
spark plug.
.Open the fuel tap
and
turn
the
ignition
to
the
ON
position.
.Kick start
the engine and
set it
to
4,000
rpm.
eCheck that under
the strobe
light
the
pointer
is
pointing to
mark (A).
138

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