Whenever
you
change the
front
seal, it's a
good
idea
to
replace the
front
gasket (part
#1124)
as
well.
Once
you
have the
front
bear-
ing cap off,
you
can
pry
the
front
oil seal
out
of
it-see
Photo
8/27.
Remove the bearing cap
by
removing the three bolts,
shown
as A in
the
photo.
The
rubber
seal is marked B in
the
photo.
Then,
simply
put
on a new gasket (part
#1124), replace the cap, and
you
are ready
to
reinstall the seal over the shaft. When you do,
take great care and make sure the
keyway
for
the transmission
pulley
and the grooves on the
shaft
for
the snap rings
don't
have any sharp
edges
that
will
cut
the seal.
Either
roll up a
piece
of
letter paper
stationery
to
cover
the key-
way,
or
wrap
the keyway in transparent tape
before
pushing
the seal over the
shaft-see
Photo
8/28.
Then, install the seal evenly and
flush all
around
the cap,
with
the closed end
outward
and the
spring
facing the transmission
-see
Photo 8/29.
ADJUSTING THE PLAY ON THE
DRIVE SHAFT
When the
engine
has been removed, it is the
perfect time
to
check
for
forward-backward
play
or
movement
of
your
drive
shaft-see
Photo 8/30. There
should
be
practically
no
play,
but
it
shouldnot
be so
tight
as
to
bind
the bear-
ings. This is also a
good
time
to
check
the shaft
around the
pulley
mounting
location
to
make
su
re
there is
no
rust.
If
there is, clean it
off
with
a
#400
grit
paper
or
cloth
and
lubricate
the
shaft
well.
If there is any play, shim the drive shaft
from
the rear.
SHIMS ARE LIKE
THIN
WASHERS
For those
who
are
unfamiliar
with
the
term
"shim,"a shim is a very
thin
piece
of
material,
usually metal,
that
is used
to
fill the gap be-
tween two parts
to
get a snug,
or
proper, fit. In
this instance, the shims
look
like very
thin
washers. If there is
too
much
"play"
in the drive
shaft when you move
it
back
and forth,
you
merely add the
right
combination
of
shims
to
leave just a trace
of
"play."
Too
much
move-
ment
of
the shaft
will
cause
misalignment
of
the
worms
and the
worm
gears.
Too
little
movement
will
cause
the
bearings
to
heat up.
If the shaft is
too
tight,
you take
out
shim
thick-
ness between the bearing
cup
and the end cap.
If it's
too
loose,
you
add
shim thickness.
(Photo
8/28)
Shaft
wrapped
with
thin
plastic.
(Photo
8/29)
Install
seal
evenly.
(Photo 8/30)
Check
for
play
in
drive
shaft.
IMPORTANT:/t's
best
to
test
shaft
movement
at
the
front
(with
the
lower
pUlley
removed
for
gripping
the
shaft)
because
it's
very
difficult
to
detect
drive
shaft
movement
from
the rear.
As
a
test
for
looseness
and
during
shimming
opera-
tions,
you
can
drain
a few
pints
of
gear
oil
out
of
the
transmission,
remove
the
handlebars
and
the
top
transmission
cover
to
reach
the
drive
shaft. Then,
you
can
move
the
shaft
(near
the
steel
worm)
back
and
forth
to
determine
how
much
shimming
is needed.
I
133
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