Flywheel and Clutch Assembly
advertently) will buckle the drive straps on the pressure
plate and cause a severe unbalance. This is immediately
followed by the flywheel shearing off the flywheel at-
taching bolts.
The 1500 clutch pressure plate and flywheel, and the
later 1300 pressure plates and flywheels as well, are not
suitable for modification. An early
X1/9 pressure plate
(Fiat
PIN
4309909) and a flywheel from a '74 X1/9
must be used on either the
G-
or F-production car.
The flywheel is modified by installing
3
large dowel
pins. The pressure plate has
3
bosses which are drilled and
reamed to fit over the
3
dowel pins. These pins provide
drive torque in both directions and prevent the clutch
drive straps from buckling under reverse loads.
The flywheel can be lightened by machining material
away on the back side. Sufficient material must be left
to provide adequate support for the large dowel pins.
The flywheel and pressure plate must be balanced af-
ter modifications are complete.
The 1500 flywheel ring gear must be used for the
1500 car (or any car which uses the 1500 5-speed trans-
mission). This ring gear has the same
I.D.
as the 1300
ring gear and can be fitted on the 1300 flywheel.
A sintered metallic clutch disc is recommended for
racing. This and the modified flywheel and pressure plate
are all avai1,able as an assembly from
PBS.
1500
C-
V
Joints
On the 1500 X1/9, the bolt arrangement for the axle
C-V joints must be modified to prevent loosening under
racing stresses.
The threaded holes must be drilled out, in the com-
panion flanges, to the body si~e of the bolts (5116 inch).
The companion flanges are then spot faced on the back
side.
Assemble the outside stub axles to the C-V joints
using
511 6-24 bolts 2.1
7
inches long. Use aircraft quality
bolts and lock nuts. The nuts must be on the inboard side
of the outer C-V jbint. This assembly is done with the
axles out of the car.
Insert 5/16-24 aircraft bolts 2.06 inches long through
the inboard stub axles with the heads toward the inboard
side. Insert the stub axles into the final drive.
Remove the two bolts which attach the strut to the
rear hub carrier and rotate the hub carrier outward about
the lower ball joint. Insert the outer stub axle and half
shaft assembly into the hub carrier.
Slip the inboard
C-V
joint onto the bolts, previously
installed in the inboard stub axles, while the hub carrier
is rotated back to its normal position. Assemble lock nuts
onto the inner bolts. Replace the bolts which fasten the
struts to the hub carriers.
Modified Axle Flanges
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