Royal Enfield SPRING FRAME O.H.V. 250cc CLIPPER 1954 Workshop Maintenance Manual page 19

ROYAL ENFIELD WORKSHOP MANUAL
Wash all passages, etc., thoroughly with petrol
after lapping, to remove all traces of grinding
paste.
Check the pump disc springs for fatigue by
assembling in the timing cover before placing the
pump covers in position. The latter should be held
1/8 in. off the timing cover if the springs are
correct.
The pump spindle should be renewed if
excessive wear has taken place on the teeth.
Re-assemble the oil pumps, replacing the paper
cover gaskets if necessary. Before fitting each
cover fill the pump chamber with clean oil.
Having assembled the pumps, lay the timing
cover flat and fill the oil ports by means of an
oilcan. Turn the pump spindle with a screw driver
in a clockwise direction looking on the front and it
can then be seen whether the pumps are operating
correctly.
Before replacing the timing cover on the
engine, fill the filter chamber with clean oil.
The oil feed to the big end can be checked by
partially unscrewing the feed plug in the timing
cover between the oil pumps and the oil return to
the tanks can be checked by removing the oil filter
cap.
17. Removal of Pump Worm and Timing Pinion
Unscrew the worm shaft by the hexagon head
behind the worm, using Special Tool No. E.5451.
This is a Left Hand Thread.
Section C3 Page 6
Withdraw the timing pinion by means of a flat
chisel placed behind the pinion and tapped gently.
18. Removal of Contact Breaker Pinion
Remove the timing cover and take off the
hexagon nut holding the pinion.
Extract the pinion with the Special Tool No.
14835.
19. Primary Chain Adjustment
Access to the primary chain adjuster is gained
by removing the primary chain cover, which is
held in position by a single nut. Before removing
the nut, place a tray under the engine to catch the
oil from the chain case.
Beneath the bottom run of the chain is a curved
slipper on which the chain rests and which may be
raised or lowered by turning the adjusting screw
after having first slackened the locknut.
The chain should be adjusted so that there is ¼
in. up and down movement at the centre of the top
run of the chain.
After replacing the chain case cover, remember
to replenish the chain case with oil.
On early models the alternator stator was
attached to the chain case cover. When replacing
the cover it is important to do up the securing nut
finger-tight and rotate the engine several times to
centralise the stator on the rotor through the
medium of the spigot bearing before tightening the
nut fully.
20. Removal of Engine and Clutch Sprockets
Remove the primary chain case cover, having
first placed a tray underneath to catch the oil.
Remove the alternator stator by unscrewing
three ¼ in. screws, taking care that the lock
washers do not adhere to the rotor.
Unscrew the engine sprocket nut.
Remove the alternator rotor and distance piece.
Remove the chain by opening the spring link.
Withdraw the engine sprocket with a suitable
extractor.
To remove the clutch sprocket, unscrew the
three clutch spring pins and the springs, plates and
sprocket can then be lifted away.
On earlier engines it is not necessary to remove
the alternator stator as this is attached to the chain
case cover.
21. Removal of Tappets and Guides
It is only necessary to remove the tappets and
guides if they have become worn.
To remove the guides heat the crankcase locally
with a blow lamp and the guide can then be with
drawn with a pair of pliers. Otherwise it may be