An oil seal is fitted in the cover from the brake shoe side, again with the lip of the oil seal
facing inwards towards the bearing. If a replacement is to be fitted the old seal can be prized
out with a screwdriver but care should always be taken when fitting a new oil seal to see that it
is inserted squarely into the hole, and great care should be taken to avoid any damage to the
feather edge of the seal.
The brake cam spindle can be removed by taking off the nut behind the brake arm, and
drawing the cam out towards the hub side. If, however, the cam is quite free in the housing and
there is no apparent excessive wear on the cam face there is no need to disturb it. The fulcrum
pin is secured by a nut on the inside of the cover; here again there is no need to disturb it unless
there is obvious damage. The two location dowels in the cover should be undamaged and a good
fit in their holes.
Dismantling Timing Side of Unit
Dismantling of the left-hand or primary drive side is now completed and attention can be
given to the right-hand side of the unit.
If the fan cowl has
not already
been removed, unscrew the three small Phillips head screws
If the fan cowl has yet to be removed, unscrew the three small Phillips head screws and the one
plain screw at the top right-hand front which also carried the throttle cable clip. Unscrew and
remove the nut securing the kickstarter sprocket and remove the sprocket complete with the chain
and spring. Take out the Woodruff key, being careful not to damage the key or the slot in the shaft.
The large extension nut securing the flywheel and fan can now be removed by screwing in a
normal anti-clockwise direction, using an 11/16 in. Whitworth ring spanner. The crankshaft,
however, must be prevented from turning by holding the opposite side with service tool number
61-5022.
With the flywheel centre nut removed, the flywheel can be extracted with service tool number
61-5002. This will expose the stator unit secured to the crankcase by three 5/16 in. nuts and
washers, which should be unscrewed using a tubular spanner to avoid damage to the
Cush Drive Rubber Assembly Fig. 8.
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