ROYAL ENFIELD 350cc and 500cc O.H.V. WORKSHOP MANUAL
Page 14
centre of the pin must be screwed tight and
centre-punched to make sure that it does not come out.
Note the hardened steel thrust washers either side of
the centre portion of the crankpin. The white metal
lined big-end bearing bushes must be handled with
great care when fitting. The white metal is soft and
easily damaged and the bush is a close fit both on the
pin and in the rod so that it must be kept absolutely
square otherwise it will jam and the white-metal faces
will be damaged. Once this bush is correctly fitted it
will outlast a roller bearing provided it is always
adequately lubricated.
The driving side flywheel can be assembled on to
the timing side wheel and crankpin either under a
press or between the jaws of a vice, using a short piece
of tube between the faces of each flywheel and the
vice jaws (see Fig. 19). When assembling the
flywheels, line them up as closely as possible by
means of a straight edge placed against the rim of the
wheels at 90° either side of the crankpin. To tighten
the crankpin nuts, use either the assembly jig shown in
Fig. 14 or grip one of the mainshafts in a vice, using
lead jaws, and place a stout metal bar against the edge
of the balance weight of the lower wheel so as to
prevent the wheels from turning (see Fig. 15). After
the wheels have been assembled and the crankpin nuts
tightened they must be trued up by placing the whole
assembly between centres and checking the truth of
the shafts with a dial micrometer (clock gauge). The
shafts must run true to within .001 in. Note that it is
"KNIFE EDGES" FOR TESTING CONNECTING ROD FOR "TWIST"
Fig. 18
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