Royal Enfield SPRING FRAME O.H.V. 250cc CLIPPER 1954 Workshop Maintenance Manual page 16

ROYAL ENFIELD WORKSHOP MANUAL
ammeter needle returns to zero, indicating that the
points have opened.
(2). Remove the sparking plug cap from the
lead and tuck the lead between the fins of the
cylinder. Rotate the cam (or housing) and a spark
will be seen at the instant the points open.
(3). Insert a piece of thin tissue paper between
the points of the contact breaker and turn the cam
(or housing) until the paper can just be pulled out.
5. Removal of Petrol Tank
Turn off the petrol tap.
Disconnect the petrol pipe.
Remove the two bolts which secure the tank to
the frame at front and rear and it can then be lifted
clear.
6. Removal of Cylinder Head
Remove the Petrol Tank (Subsection 5).
Remove the Engine Steady and Exhaust
Pipe.
Disconnect the Oil Pipe and Sparking Plug
Lead.
Push the Carburetter back clear of the studs
after having removed the fixing nuts.
Remove the Rocker Box Cover.
Turn the engine until both valves are
closed.
Remove the Rockers and Bearings complete
by undoing four ¼ in. nuts on each.
Lift out the Push Rods, having marked them
so that they can go back in the same positions.
Remove four nuts, taking care not to lose the
washers, and lift off the cylinder head. To break
the seal, tap the head gently with a hide hammer
beneath the exhaust and inlet ports, not beneath
the fins.
Before replacing the head see that the two
Hallite washers are in position in the push rod
holes in the barrel.
Apply a thin coat of compound to both sides
of the gasket and place in position. It is
preferable to fit a new gasket each time the head
is removed.
Place the head on the cylinder barrel and
replace the four nuts which should be tightened
progressively and diagonally from one side to
the other to prevent distortion. If new Hallite
washers have been fitted, screw down the two
nuts on the timing side first, sufficiently to
compress the washers.
Replace the push rods in their correct
position, with the adjustable ends downwards.
Refit the Rockers and Bearings, making sure
that the oil feed hole is on the underside and that
the cap and base of each bearing are in line
when tightened down. A sharp tap with a
hammer on the end of the rocker will help to
ensure this. See that the valve stem caps are in
place.
See that the Rocker Box Gasket is intact and
replace the Rocker Box Cover.
After the engine has been run long enough to
get thoroughly hot, the tightness of the nuts
should be re-checked.
7. Removal of Valves
Remove the Cylinder Head and Rockers
(Subsection 6).
Prise away the hardened steel thimble or end
cap. If this has stuck it can be removed by
means of a screwdriver.
Using a suitable compressing tool compress
the valve springs and remove the split conical
collets from the end of the valve stem.
Section C3 Page 3 Section B3 Page 3