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44
3.
E N G I N E
----------------------------
3-9
INSPECTIONS AND ADJUSTMENTS
A.
Adjusting Tappets
Tappet
clearance has a major affect on the timing of
the
opening
and
closing of
the
valves and
the
running of
the
engine.
A raised tappet can keep a valve from
closing
com-
pletely, releasing pressure in the combustion chamber and preventing
the
engine
from
firing.
On
the other hand,
if
the tappet clearance is
too large,
tappet noises become
loud.
Since
tappet clearance is closely related
to
the output
of the
engine, affects low
spee::l
running
and noise,
special
care must be
taken to keep the tappets
adjusted correctly.
How to Adtust
1
.
Remove tappet adjusting hole cap.
2.
Remove
contact breaker
cover.
3
.
Match the dynamo rotor
"T"
mark w ith the
mark
on
the
dynamo
stator
with the piston
at top dead center and check tappe
t
clearance.
4.
Correct clearance when the
engine is
cold is 0.05 mm.
5.
If
the
clearance
is
incorrect,
loosen
the adjusting nut with tappet adjusting wrench and
tappet lock wrench and adjust the clearance with the adjusting
screw.
CAUTION
The adjustment may be
changed
when tightening
the
adjusting nut, so recheck
the
tappet
clearance
carefuliy
after tightenig
the
nut.
B.
Adjusting Ignition Timing
Even if compression and valve
timing is correct,
the engine cannot perform properly if
the
ignition
timing
is
not correct.
Early
or
late ignition timing can cause overheating, back-
fire and other
troubles.
The
contact breaker controls
electricity now
to
the
primary
coil
and
by
breaking
it
induces
high voltage in
the secondary coil.
The contact points ore
the
vital
part
of
the
contact breaker and the color of
their
contact surfaces w ill tell the condition of the
engine,
as follows:
Gray
.
.
.
..
.
...
Normal
Yellow
..
.
...
Gasification
of oil must
be
taking
place or oil is contaminating point
surfaces
Blue
.
.
......
.
High
heat due to trouble in
condenser,
etc.
The contact points wear little by little during
operation.
If the
point
gap
becomes
incorrect or wrong timing is caused
it will
adversely affect
the
engine
performance.
It
is
necessary to check
the
points periodically
.
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