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ENGINE
FLYWHEEL HOUSING
2-51
5. Shift housing by tapping with lead ham-
mer as required to bring run-out at pilot hole
within .002" indicator reading. Tighten hous-
ing bolts and recheck run-out.
6. Using Special Reamer J 808-4 and Ratch-
et Wrench J 808-6, ream the dowel holes and
install two oversize dowel pins J 808-5. See
figure 2-53.
Figure 2-53-Reamlng Dowel Pin Hoi..
7. Mount dial indicator on crankshaft flange
and set to bear against rear face of flywheel
housing at a radius of
2%".
8. Turn crankshaft and note run-out of hous-
ing rear
face,
making sure that end thrust of
crankshaft is all one
way
while making this
check.
If
total indicator reading exceeds .003",
shellac paper shims of proper thickness in posi-
tion required to give an indicator reading of
.003" or less.
9.
Install flywheel, clutch (par. 4-16), and
transmission (par. 4-34).
2-34 CORRECTION OF UNBALANCED
ENGINE
The in f ormation in
this
paragraph applies
only to engines used with Syncro-Mesh trans-
missions.
An extremely unbalanced engine should
always
be
corrected by replacing parts which
are
abnormally
out of balance or materially
different in
weight
from corresponding parts.
The proceaure
described here is
intended
only
for corrections of
minor
cases of unbalance
which may occur where individually balanced
parts are assembled
together.
If
the vibration developed after removal and
installation of clutch assembly, check all clutch
cover bolts to make sure they are of Same length
and that each has one lock
washer.
Also check
marks that were made when clutch was re-
moved and disassembled to make sure that
clutch was assembled and installed according
to these marks. Make any corrections indicated
by this inspection and run engine at the critical
speed to check results.
If
clutch assembly and installation does not
appear to be at fault, mark clutch cover and
flywheel and remove clutch assembly (par.
4-10). Run engine at cr it ical speed and check
for vibration.
If
vibration is
eliminated,
the
clutch is at fault and should be balanced as de-
scribed below
.
If
vibration
still
exists,
however,
it will be necessary to balance the
flywheel
on
the crankshaft.
To balance the flywheel, insert one clutch
cover bolt successively in each hole in flywheel
and check results at each position by running
the engine.
It
may be necessary to vary the test
weight by adding washers or by using a shorter
bolt. When a
proper
weight and position has
been found to eliminate the vibration, the bolt
will be on the light side of flywheel. Remove
the bolt and drill shallow holes in diametrically
opposite side of flywheel, until enough weight
has been removed to make engine run smooth.
Use a
%"
drill and do not drill any hole more
than
%,"
deep
.
Install clutch
assembly
according to marks
(par. 4-16) after making sure that engine runs
smooth with clutch removed, and again check
for vibration at the critical
speed.
If
vibration
exists with clutch installed, install one plain
washer under the lock washer of each clutch
cover bolt in turn until a location is found
where the engine runs smooth.
It
may be neces-
sary to place plain washers on two ad
jacent
bolts in order to
obtain enough
weight at the
pr oper location to secure
bal
ance.
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