footrest rod, inner half of the primary chain case and
the leads to the dynamo ; also the clutch, exhaust lifter
and magneto control wires from the handlebars.
Remove the top gearbox attachment stud (by
unscrewing the nut at the chain case end and knocking
out towards the opposite end) and the bottom stud;
also the studs securing the crankcase to the engine
plates and the studs and distance pieces securing the
engine plates to the bottom of the seat tube of the
frame, and to the chainstays and cradle tubes.
Remove both the engine plates and the gearbox. Take
the weight off the engine and remove the stud
securing the front of the crankcase to the bottom of
the down tube of the frame and lift the engine out in a
backwards direction. Fig. 12 shows the machine with
the engine ready to lift out after removal of the front
attachment stud.
14. Dismantling the Crankcase.
To dismantle the engine, remove the cylinder
head, cylinder and timing gear as described in Paras.
1, 2 and 10. Now unscrew the oil pump driving worm,
which has a left-hand thread. This can be unscrewed
by means of a thin spanner, a small lathe carrier or
preferably by using the special tool shown in Fig. 13.
The small timing pinion has not sufficient clearance
behind it to allow an extractor to be used and must be
knocked off its taper by driving a blunt chisel between
the back of the pinion and the bronze oil seal bush
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