Buick LeSabre 1965 Service Manual page 152

4 - 1 6 46000 CLUTCH
CLUTCH, S-M TRANSMISSION
face. Test for roughness of balls
and races by pressing and turning
front race slowly. Inspect main
drive gear pilot bushing in crank-
shaft. If bushing is rough or worn
it should be replaced.
4 - 1 1 ALIGNMENT OF
FLYWHEEL UPPER
HOUSING
The flywheel upper housing which
joins the synchromesh transmis-
sion to the engine crankcase is
attached to the crankcase by
bolts, with two straight dowels to
maintain alignment.
Misalignment between the pilot
hole which receives the main
drive gear bearing in rear wall
of housing and the pilot bushing
in rear end of crankshaft may
cause the transmission to be
noisy or to slip out of high gear.
To insure correct alignment in
production, the pilot hole is bored
in the housing after it is as-
sembled to the cylinder crank-
case. The flywheel h o u s i n g
furnished for service is com-
pletely machined, but it must be
checked f o r alignment a f t e r
installation.
If an existing housing is suspected
of being out of alignment it may
be checked after removal of the
transmission and clutch assem-
blies. If a new housing or cylinder
crankcase is b e i n g installed,
alignment should be checked be-
fore the flywheel, clutch and
transmission are installed. When
checking alignment the engine
DIAL INDICATOR
HOLE ATTACHMENT
SLEEVE
SUPPORT
J 4710-1
Figure 4-13—Checking Alignment of Housing at Pilot Hole
must be in an upright position,
dowel pins must be installed, and
all housing bolts must be tight.
a. Checking Alignment of
Flywheel Upper Housing
1. Remove transmission (par.
4-15) and clutch, leaving flywheel
in place.
2. A t t a c h Indicator S u p p o r t
J-4710-1 to flywheel with two fly-
wheel bolts. Mount dial indicator
and hole attachment on pilot as
shown in Figure 4-15. Adjust ball
end of hole attachment to bear
against side of pilot hole in fly-
wheel housing.
3. Turn flywheel very slowly and
note total run-out of pilot hole as
shown by dial indicator. If total
indicator reading is .005" or less,
flywheel housing alignment is sat-
isfactory. If run-out exceeds
.005", correction must be made
as follows:
b. Correction of Flywheel
Upper Housing Misalignment
1. Remove flywheel upper hous-
ing and d o w e l p i n s f r o m
crankcase.
2. Drill out bolt holes in flywheel
housing with a 1/2" drill.
3. Install flywheel housing with-
out dowel pins, and leave bolts
just loose enough to permit shift-
ing of housing by tapping with lead
hammer.
4. Install dial indicator as shown
in Figure 4-13, and check run-out
at pilot hole in housing.