Remove panel screws and note that the top
three are shorter than the bottom three. Two
countersunk screws are inside the
mag.
chain
case.
When withdrawing the panel see that the
big end feed jet is not lost and that any shims
fitted to the cam spindles remain in position.
Remove big end
feed
jet spring.
Fig.
8.
21.
F ING TIMING
PANEL.
Clean the edges of the timing chest and
the panel.
Smear the edges with gold-size or jointing
compound.
Check fibre washer on the oil pump nipple,
connecting pump to panel.
Place panel in position and the washer
should prevent the edges of the panel meeting
the case by 1/32". This ensures that when
the panel pins are tightened, the washer
is
compressed, making an oil-tight joint.
Fit
spring and jet in jet holder.
Fit
panel and panel
screws
and tighten down
evenly.
22.
IGNITION
TIMING.
Place chain and sprocket in position and
tighten cam wheel sprocket nut
only.
Place gearbox change-speed lever in top
gear position.
Advance ignition fully.
Rotate engine by turning the rear wheel,
until both
valves
are closed and the piston
is
at the top of its stroke.
The
position of the piston
can
be ascertained
by placing a thin rod into the cylinder,
via
the sparking plug hole.
Hold rule on the top of the piston and
take the reading of the rule
as
it
leaves
the
cylinder.
Turn
the rear
wheel
backwards still holding
the rule on top of the piston till the rule
shows the correct figure. (See data sheet.)
13
Remove
magdyno contact breaker cover.
Turn
contact breaker in
clockwise
direction
all the points open.
Insert thin feeler gauge or thin piece of
paper, between the points.
Turn
the contact breaker in
an
anti-clock-
wise
direction till the points hold the feeler.
Turn
contact breaker in a
clockwise
direc-
tion till the feeler is just
free,
that is when
the points have just commenced to open.
Place a tube over the end of the shaft
and
~harply
tap tube, forcing sprocket on
to
the
taper of the shaft.
Tighten down nut carefully, so
as
not to
turn
the shaft.
When
nut is tightened down, check timing.
Fit contact breaker cover.
Fit magdyno chain cover.
Fit sparking plug.
23;
REMOVING
TIMING
GEARS,
OIL
PUMP,
AND
TAPPETS.
Remove riming panel (Para.
20
),
riming
gears
and oil pump are now visible.
Remove
oil
pump nuts and withdraw oil
pump from studs.
Remove oil pump worm, LEFT HAND
thread.
Timing gears may now be removed ensuring
that any shims fitted to either end of the
spindles are not lost.
Withdraw pinion from riming shaft using,
if necessary, a sprocket drawer.
Unless absolutely necessary the tappets
should not be removed
as
it
is necessary
to
remove the tappet guides before the tappets
may be withdrawn.
The
tappet guides are
pressed into the crankcase and may be extracted
by means of a sprocket drawer.
The
inlet and emaust tappets should not
be interchanged.
24.
FITl'ING
TAPPETS,
TIMING
GEAR
AND
OIL
PUMP.
If new timing gears have been fitted then
they will need checking
and
re-shimming for
end
float.
When fully home in the
case
the
side of the gear should be clear of the
~oss
carrying the pressure release
valve.
Shims
should be added until this condition
is
obtained.
Fit
timing
cover?
pull
~d
push
on_
~ct
caDi
spindle and shim up till end float JS Just
p:rceptil>le.
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