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Royal Enfield "Interceptor" Workshop Manual
Page 13
A
CORRECT
INCORRECT
TIMING CHAIN ADJUSTMENT
Fig. 5
housed in a lug across the frame immediately
behind the steering head. The rear fixing on the
4¼
gallon tank is by means of
a
transverse clamp
and two bolts which pull the tank down on to
rubber blocks above and beneath the top tube.
On the sm,aller capacity tanks used in the U.S.A.
a rubber lined metal clip is used secured by two
l
in. diameter bolts and nuts.
·
To remove the tank, :first disconnect the petrol
pipes, then remove the nut from one end of the
front attachment stud and knock out the stud.
Then unscrew the nuts or bolts securing the rear
end of the tank and lift it away, taking care not to
damage the paintwork on top at the front end
where it may come into contact with the handlebar
clamp. It is preferable to remove the dual seat
and rear mudguard before attempting to lift the
tank.
30.
Removal and Refitting of the Cylinder Head
First remove the petrol tank and petrol pipe.
(Subsection 29.)
The dual seat may also be removed if desired.
(Subsection 28.)
Remove head steady brackets.
Disconnect the oil pipes and plug leads.
Remove the exhaust pipes and carburetter(s),
also the induction manifold on single carburetter
models.
Remove the rocker box
covers.
·
Turn the engine until both valves in one head
are closed.
Remove the five cylinder head nuts from the
head hit it smartly with a hide mallet beneath the
exha~st and inlet ports (not the fins) and lift it off.
Turn the engine through one revolution and
repeat with the other head.
When replacing the heads, see that the dowels
are in position in the cylinder barrels and that the
push rods are the right way up (shallow cups
upwards).
See that the taper section "Cross" sealing ring
and its seatings are perfectly clean and that the
rubber seals for the push rod tunnels are in good
condition and correctly :fitted.
With the head
upside down on the bench drop the :packing shim
into the recess first, then the seal with the metal
side downwards.
A little jointing compound
should be applied to both sides of the "Cross"
sealing ring and the rubber push rod tunnel seals.
Lower
the
cylinder heads over the push rods
making sure that the rockers locate ~n the cups.
Fit the head nuts
and washers
and tighten down
lightly.
At this stage fit the induction pi:pe on
single carburetter models.
·
Do not overt1ghten
the nuts-20 lbs. ft. is the recommended figure.
Tighten each nut a little at a time in turn. Begin
with the two inside nuts and the one by the spark
plug, leaving the final tightening of the corners
to the last.
31. Removal of the Valves
Having removed the cylinder head, remove the
rocker-box covers each held by four nuts, and
swing the rocker cl~ar of the valve. Using a suitable
valve spring compressing tool, compress the valve
springs and remove the split collets from the ~nd
of the valve stem. Slacken back the compressmg
tool and release the springs. Withdraw the valve
and place its springs, top spring collar (and botto~
collar
if
it is loose) and split collets together
Ill
order that they may be reassembled with the valve
from which they were removed.
.
Deal similarly with the other valves m the heads.
If
the valve will not slide easily through the
valve guide, remove any slight burrs on the end
of the valve stem with a carborundum stone.
If
the burrs are not removed and the valve is forced
out, the guide may be damaged.
REMOVAL OF VALVES
Fig. 6
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