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(71)
ENGINE
FLYWHEEL
2-49
I
Figure 2-48-Flywheel Boltl and Dowel Nuh-1948 Seriel 70
special machine during production. In this test
the flywheel is drilled, if necessary, to finally
balance the entire engine to very close limits.
For this reason, the flywheel and the crank-
shaft flange should be marked before flywheel
is removed so that flywheel may be installed
in its original position on the crankshaft.
It
is also advisable to run the engine after the
clutch is removed to note the degree of vibra-
tion with the original flywheel.
Series
40-50
flywheels are attached to the
crankshaft with bolts, lockwashers and nuts.
It is necessary to remove the crankshaft rear
bearing cap and remove bolts from crankshaft
in order to remove the flywheel. CAUTION
:
Wh
en
turning crankshaft with rear bearing
cap removed, hold the bearing inner
oil
seal to
prevent
it from
moving
out of the groove in
crankcase.
1948
Series
70 flywheels are attached to
crankshaft with bolts and lockwashers installed
from the rear and threaded dowel nuts installed
in crankshaft flange. See figure 2-48. It is not
necessary to remove the crankshaft bearing
cap to remove a Series 70 flywheel.
To remove a flywheel ring from the flywheel,
~)
LOCK
WASHER
DOWEL NUT
drill a
%6"
hole in the r
ing
between two teeth
and split the ring at
t
his point with a cold
chisel.
The flywheel r
ing
is a shrink fit on the fly-
wheel and must be heated to
approximately
600
0
F. in order to expand it
sufficien tl y t
o go
over the flywheel. Heating the ring in excess
of 800
0
F. will destroy the effect of the heat
treatment given during manufacture.
Excessive heating may be avoided by first
polishing several spots on the ring with emery
cloth, then heating the ring only until these
spots begin to turn blue. Heat the ring to ap-
proximately 600
0
F. on a hot plate if available
;
otherwise, place ring on a sheet of metal or
asbestos and heat it with a torch that is kept
moving to secure even
heating.
When ring is at
proper temperature,
quickly
place it
over fly-
wheel and allow the ring to cool slowly until it
is tight in place.
If a new flywheel or a new
crankshaft
is be-
ing installed, the flywheel bolt holes must be
reamed to provide a very close fit for the bolts.
Two bolt holes are reamed to size in replacement
flywheels and
crankshafts.
Use these reamed
holes to bolt the parts together, then ream the
other holes and install bolts.
After installation of a new flywheel or a new
flywheel ring, be sure t
o
run the engine and
check for vibration
before
installing the
clutch.
If engine has vibration that did not exist before
installation of
new
parts, make correction as
described under Correction of Engine Vibra-
tion
(par.
2-34).
2-33 FLYWHEEL HOUSING ALIGNMENT
The information in
this paragraph
applies
only to
engin es us
ed with
Syncro-Mesh
trans-
missions.
The flywheel housing is attached to the cyl-
inder crankcase with six
Vt
6"
bolts. Two
%"
straight dowel pins are installed in reamed
holes in both parts to maintain alignment.
Misalignment between the pilot in rear face
of housing and the pilot bearing in rear end
of crankshaft may cause the transmission to
be
noisy
or t
o
slip out of high
gear.
To insure
correct alignment in
productio:
1,
the pilot hole
which receives the
transmisuon
main drive
gear bearing is bored in the housing after it is
assembled to the cylinder crankcase. The fly-
wheel housing furnished for service is com-
pletely machined, but it must be checked for
alignment after installation.
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