Royal Enfield 500 TWIN 1949 Workshop Maintenance Manual page 40

ROYAL ENFIELD WORKSHOP MANUAL
two screws. Withdraw the two screws and lift
off the fixed contact.
Remove the single securing screw and
terminal nut on the condenser and lift off the
condenser.
Withdraw the driving dogs on the shaft
carrying the cam and automatic timing control
and lift these off the shaft.
The automatic timing control should not be
dismantled unnecessarily. If it is desired to
dismantle the mechanism, carefully note the
position of the various components in order that
they may be refitted correctly.
3 (c). Bearings
Badly worn bearings are usually indicated by
the maximum opening of the contacts varying
considerably as the shaft is slowly rotated by
hand while side pressure is applied to the cam.
Porous bronze bearing bushes should be inserted
in the body on a highly polished shouldered
mandrel, which will give the finished bore
diameter without machining. Before use, bushes
should be stored in a covered container and fully
covered with oil of a grade equivalent to
Mobiloil Arctic or other good thin mineral oil
for a minimum time of 24 hours.
3 (d). Contact Breaker
When trimming a pair of contacts it is not
essential to grind down a slightly pitted contact
but only to remove excess metal from the piled
contact. Should the pitting and piling be found
excessive a replacement contact set, comprising
both fixed and moving contacts, should be fitted.
Before despatch, replacement contacts are given
a protective coating of oil, which should be
removed with a petrol-moistened cloth before
fitting.
3 (e). Reassembly
Reassembly is a reversal of the dismantling
procedure described in Subsection 3 (b). Note
that an insulating washer must be placed over
the contact breaker pivot before the moving
contact is fitted.
Section G1a Page 3