Turn the engine until both valves are closed, i.e. after the inlet valve
has opened and just closed.
Remove two nuts and the bolt securing the engine steady bracket to
the rocker box and frame. Disconnect valve lifter cable.
Take out the nine bolts securing the rocker box to the cylinder head
(one of these bolts is inside the rocker box). The location of these bolts
roust be noted as they are dissimilar,
Tilt upwards the right side of the rocker box, extract both push rods
and identify their location for replacement in their original positions,
remove the rocker box from the cylinder head.
To remove the cylinder head. Remove the exhaust pipe and silencer as
one unit, then the accessory compartment cover and air niter tube if
fitted. Do not rock the exhaust pipe sideways unduly to extract it from
the exhaust port which can cause the end of the pipe to close in and
result in gas leakage, with movement between the pipe and the port when
the engine is hot. Instead squirt a little paraffin or petrol into the port
and try again.
Unscrew the cap on the carburetter mixing chamber, take out both
slides, wrap them in a piece of rag and attach it to the frame, out of
harm's way. Unscrew the petrol pipe union and take away the petrol pipe.
Four sleeve nuts and one bolt retain the cylinder head to the barrel, with
these removed, the cylinder head with carburetter attached to it can be
separated from the cylinder.
NOTE—Four nuts only are used on heavyweight engines.
FIG 4 Cylinder head
26
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