Royal Enfield SPRING FRAME O.H.V. 250cc CLIPPER 1954 Workshop Maintenance Manual page 18

ROYAL ENFIELD WORKSHOP MANUAL
If the old copper gasket is used for the
cylinder head joint, it should be annealed by
heating to red heat and plunging in water.
New Hallite washers, painted with gold size
or compound should be fitted to make the joints
in the push rod enclosure tubes.
Smear clean oil over the piston and space the
ring gaps, having replaced the rings if these have
been removed, lower the piston over the
connecting rod and insert the gudgeon pin. Fit
the circlip securing the gudgeon pin.
If the piston ring gaps exceed 1/16 in. when
the rings are in position in the barrel, new rings
should be fitted. The correct gap for new rings is
.011 - .015 in. The gap should be measured in
the least worn part of the cylinder, which will be
found to be the extreme top or bottom of the
bore.
Oil the cylinder bore and lower the barrel
over the piston and seat it gently on the paper
washer. Tighten down the cylinder base nuts,
working diagonally from one to another to
ensure pulling the barrel down dead level.
Replace the cylinder head and rockers as
described in Subsection 6.
15. Cleaning the Oil Filter
The oil filter is located in the timing cover
immediately below the oil pump. The felt
element should be taken out and washed in
petrol after the first 500 miles and every
subsequent 2,000 miles. Fit a new element every
5,000 miles.
The filter element is removed by unscrewing
the nut holding the end cap in position. When
re-assembling the filter after cleaning, take care
that no grit or other foreign matter is sticking to
it. After emptying the filter chamber it is
essential to run the engine slowly for about five
minutes to ensure that oil is reaching the big
end. If the timing cover has been removed, fill
the filter chamber with clean oil before
replacing the cover.
16. Overhaul of Oil Pumps
Remove the timing cover as described in
Sub-section 1.
Remove the end plates from both pumps.
Remove the pump discs and plungers.
Remove the pump spindle which can be
pulled out from the front or return pump end.
Check the fit of the plungers in the pump
discs which should have a minimum of
clearance but should be able to be moved in and
out by hand.
If, when fitting a new disc or plunger, the
plunger is found to be too tight a fit, carefully
lap with metal polish until it is just free. If the
pump disc is not seating properly or if a new
pump disc is being fitted, it should be lapped to
the seating with Special Tool No. E.5425, using
Carborundum 360 Fine Paste or liquid metal
polish until an even surface is obtained.
Section C3 Page 5