Royal Enfield SPRING FRAME O.H.V. 250cc CLIPPER 1954 Workshop Maintenance Manual page 23

ROYAL ENFIELD WORKSHOP MANUAL
The connecting rod can then be removed.
Turn the crankshaft over in the jig and repeat
with the other side if necessary.
To remove the main shafts, remove the set
screws from the shaft nuts and unscrew nuts. Tap
the shafts out with a hammer and bronze drift.
To replace the main shafts reverse the above
process, making sure that the keys are a good fit.
The nuts should be screwed up very tightly, using a
well-fitting box spanner and a 12 in. tommy bar.
To re-assemble the crankshaft, press the crank
pin into the timing side flywheel, making sure that
the oil hole is in the correct position and that the
thrust washer is facing the right way, i.e., with the
chamfer away from the flywheel. (See below).
Test the oil passages with an air line or oil gun
to make sure that they are clear.
Smear oil over crankpin and floating bush.
Put the floating bush over the crank pin.
Put the connecting rod over the floating bush.
Place the other thrust washer over the crankpin.
(Chamfer away from flywheel).
Press the driving side flywheel on.
Put the flywheel in the assembly jig E.2775 to
ensure the flywheels and shafts are in line, tighten
the nuts as much as possible and replace the set
screws.
Test the oil passages again to ensure that they
are clear.
If the same crank pin has been put back, it will
be necessary to drill out the grub screw, in order to
clean the oil passages after which a new grub
screw must be fitted.
Mount the crankshaft between centres and true
up to .0005 in. on either side of the shafts.
Section D3 Page 2
If the readings for the two shafts are high on
opposite sides, the error can be corrected by gently
tapping either or both of the flywheels.
If the readings are high on the same side of the
two shafts, it is probably due to dirt or foreign matter
in the joints and the crankshaft should be dismantled
again, carefully examined
re-assembled.
Thrust washers are available in the following
thicknesses, .065 in., .075 in., .085 in. and .100 in.
for adjusting the end float on the crankshaft. The end
float should be adjusted to centralise the connecting
rod in the mouth of the crankcase and should not
exceed .015in. when newly assembled.
7. Reassembly of the Crankcase
Replace the outer roller races in the crankcase
halves as described in Subsection 4.
Fit the distance piece and the rollers and cages in
the driving side crankcase and pour a little clean oil
on to them.
Lay the thrust washer on the bearing.
Assemble the flywheel into the bearing.
Make sure that the crankcase face is clean and
apply jointing compound to it.
Put the thrust washer on the timing side shaft and
then the rollers and cage.
Place the timing side crankcase in position over
the flywheel. Where Miller electrical equipment is
fitted, it is an advantage to put the contact breaker
housing straps in position before bolting up the case.
Bolt the two halves of the crankcase together,
making sure that the joint matches correctly so that
the cylinder base is flat.
and cleaned and