4)
Tappet Adjustment (See Fig.
6-3-6)
With tappet
in
its lowest position, hole
valve down and insert feeler gauge
between valve and tappet stem. The
clearance
for
both intake and exhaust,
with engine cold, must be and
0.16
%
0.20
mm
for
EY14,
EY18-3,
EY23, EY25-2
and
EY27-2.
If
the clearance is less than it
should be, grind the end
of
valve stem a
very little at a time and remeasure.
If
the clearance
is
too large, sink valve
seat with seat cutter tool.
After obtaining correct clearance, as-
semble valve springs and spring retainers,
and
secure them
in
place with the re-
tainer
locks.
Check
operation
of
valves
by
turning crankshaft over
by
hand and
remeasure tappet clearance.
6-3-9
MAIN BEARING COVER
Fig.
6-3-6
Remove mounting screws.
(EY14:
6
mm
bolt and washer
7
pieces/EY18-3,
EY23, EY25-2,
EY27-2:
8
mm
bolt
8
pieces)
Tap around outer surface
of
main bearing cover with a soft hammer to break it loose and
carefully remove it,
so
as not to damage oil seal.
In
reassembling
EY14,
EY18-3
and
EY23
main bearing cover, install governor gear and governor
sleeve inside it
first,
and make sure that governor shaft is already installed in crankcase.
In
this case,
in
order to prevent damage
of
governor gear (made
of
plastics) which has been
installed inside main bearing cover, reassemble main bearing cover to crankcase, making sure
that governor gear mesh
with
cam gear.
In
reassembling
EY25-2,
EY27-2
main bearing cover, mount governor yoke inside main bearing
cover before remounting it. (See Fig.
6-3-7)
If
oil seal must
be
replaced, force fit
a
new
oil seal
in
main bearing cover before mounting it.
In
reassembling main bearing cover, apply oil to bearing surfaces, gear train, tappets and oil
seal lips and form a light film
of
oil
on
main bearing cover face to hold gasket in place. Mount
an
oil
seal guide
on
to the crankshaft to prevent damage to the oil.seal lips. (Fig.
6-3-8)
Confirm that crankshaft end play is
0
~0.2
mm.
If
necessary, adjust it with adjusting collar.
(See
Fig.
6-3-9)
Fig.
6-3-7A
(EY14, EY18-3, EY231
(Model
Bl
Fig.
6-3-
7B
(E
Y25-2,
E
Y27-21
(Model
D)
-
25
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