Assembly
group
7
CRANKCASE, CRANKSHAFT
Special JLO Tools
Puller
444.31.807.000 (10)
Pair of half shells
444.31.072.000 (10)
Retaining ring
444.31.071.100 (10)
DISASSEMBLY
7.3.
1
2
ASSEMBLY
7.4.
1
2
3
Loosen screw
(3)
and remove spring washers
(4).
To
separate crankcase halves
(1+2),
heat them to approx.
212°F
(100°C).
Lift housing that pto shaft end hangs free and carefully tap
crankshaft with plastic hammer out of crankcase.
Discard gasket
(7).
Pry or knock out oil seals
(6)
(see ill.
I).
To remove ball bearings
(8)
from crankshaft
(5)
use bearing
puller assembly
(10)
(ill.
II).
Slightly lubricate new oil seals. Knock seals with oil seal
installation tool into both crankcase halves
(1+2)
.
Sealing lips
must point into crank chamber (ill.
III).
Heat ball bearings
(8)
to approx.
175°F
(80°C) and drive them on
crankshaft by a ball bearing driver (ill.
IV).
NOTE
:
Ball bearing must be driven on inner bearing race.
Place heat shield over oil seal
(6)
and heat crankcase half
(2)
to
212°F
(100°C) and install crankshaft
(5)
in crankcase. Press
firmly in place.
NOTE
:
Make sure that seals
(6)
are not damaged (Use appropriate slip
cone)
.
Lightly grease new gasket
(7)
with general purpose grease and
place in position on crankcase
(2).
Heat crankcase half
(1)
to
212°F
(100°C) in same manner as
described under item
3
and mount on crankcase half
(2).
Ensure
that both crankcase halves
(1+2)
are properly aligned and install
screws
(3)
with spring washers
(4)
fingertight.
Re-check mounting surface €or cylinder. Cut off overhanging
gasket
(7).
After mounting the cylinder (see description on page
19)
cross-tiahten crankcase screws
(3).
Turn crankshaft
(5)
by hand to ensure freedom of rotation. If
crankshaft will not turn freely, tap each end of crankshaft
lightly with a plastic hammer.
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