ENGINE
(8) Insert
the
tappets, each
tappet
being com-
plete with shim.
Be
sure
that
guide pin
holes in
tappet
and
pump
housing are
aligned. Attach lock plate and,
through
the
plate, insert guide pin. After installing the
guide pins, lock the pins by bending
the
plate sharply.
Installing
tappet
(9) Install the smoke-set device, positioning its
return spring and washer correctly, and
lock it by inserting split pin.
(10) Adjust and set the reassembled injection
pump
in the following manner:
(a) A proper
amount
of
shim
must
be used
on the mounting seat when positioning
the
pump
in place. Engage
the
tie rod
(linked
to
the governor lever) with the
control rack, and fit
the
tie
rod
spring.
Shim stocks are available in nine thick-
nesses: 0.2
to
1.0 mm (0.01
to
0.04
in.), the thickness increment being 0.1
mm (0.004 in.).
(b) Reconnect the fuel feed line
to
the
pump, admit fuel oil
into
the pump, and
2·40
vent air
out
of
this line by loosening the
air vent screw.
(c) In the present engine, fuel injection
is
prescribed
to
begin at 19° before
top
dead center. In
other
words, each pump-
ing element
of
the
pump
is
required
to
start delivering a slug
of
fuel when the
piston in its corresponding cylinder
comes
to
a position
of
19° (crank angle)
B.T.D.C.
on
compression stroke. This
start,
that
is, injection timing, can be
checked in the following way:
..
Take No. 1 cylinder
as
the reference.
Remove the delivery valve holder,
delivery valve and spring, and install the
holder only, so
that
the fuel will con-
tinuously spill
out
from the holder.
..
Slowly
turn
over engine crankshaft by
hand until the fuel ceases
to
overflow
from
the
holder and, right then
at
the
crank pulley, observe the timing mark
to
see
if
the piston (in
No.1
cylinder)
is
at
19°
B.T.D.C.;
if
not,
increase
or
decrease
the thickness
of
the shim on the mount-
ing seat.
Checking injection timing
• The
moment
the fuel ceases
to
overflow
corresponds
to
the start
of
injection.
Increase the shim thickness
to
retard the
timing and vice versa. Changing the
thickness by 0.1 mm (0.04 in.) produces
a change
of
about lOin timing.
..
The
start
of
injection can be checked
at the end
of
injection pipe, with
p
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