Service Sheet No. 1004 (contd.)
Dismantling the Gear Cluster
Take out the selector fork spindle, which is a push fit into the cover, and remove the two
selector forks. The mainshaft and layshaft can then be removed from the bearings in the outer cover,
and this will only leave the cam plate and its pivot pin in the outer cover. The cam plate can be
removed by taking out the split pin and drawing out the pivot pin from the side. The kickstarter
spindle and ratchet slide on to the end of the layshaft. The ratchet pawl should be examined to see
that it is in good condition and that the small plunger and spring underneath the pawl are not sticking.
If the pawl is worn or damaged it should be replaced. The ratchet teeth inside the low gear and
kickstarter pinion should also be examined to make sure that it is fit for further use.
The mainshaft phosphor bronze bush in the outer cover is an interference fit and is also
pegged on the face to prevent it revolving. Replace this bush only if wear is apparent.
The 20T sliding dog pinion can be slid off the mainshaft splines leaving the small 16T pinion,
which is a press fit on the shaft, retaining in position the 25T pinion. The mainshaft 16T and 25T
pinions are selectively assembled during manufacture and if any one of these parts
has to be replaced the complete assembly -
under part number 76-3174 must '13e - obtained.
Similarly, the 25T layshaft pinion is retained on the shaft by the 17T pinion, also a tight press fit, and this assembly is
always supplied complete. The part number is 76-3018.
Removal of the Timing Gear
To remove the timing gear it will be necessary to hold the crankshaft using service tool 61-5022.
Flatten the tab washer on the large timing or camshaft pinion and unscrew the nut in a normal anti-clockwise direction ; the
camshaft pinion is then extracted from the shaft using service tool 61-5025 fitted with legs 61-1732 (short legs). See Fig. 12.
The large crankshaft pinion nut is again unscrewed in an anti-clockwise direction. There is no tab washer and the tool required is a
normal 11/16 in. Whitworth spanner. To withdraw the pinion special long bolts must be used with extractor number 61-5025. These are
numbered 61-5006.
"
It will be noted that both pinions are marked to facilitate reassembly and that the crank-, shaft pinion nut has a register which goes
against the pinion. There is also a dowel in the crankshaft which locates the small crankshaft pinion.
Removing Camshaft Pinion
Fig. 12,
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