TO REMOVE THE PETROL TANK
Close both petrol taps and remove the cap nut securing each petrol pipe banjo con-
nector. Use two spanners, one to hold the tap and the other to unscrew the cap nut.
Beware losing the fibre washers (4 in all) fitted one each side of each banjo connection.
Cut the wires interlacing the four fixing bolts.
Remove the tank fixing bolts and the tank is then free to be taken away.
NOTE—The disposition of the various rubber and metal washers and tubular spacers
should be specially observed so that they may be correctly replaced.
TO REPLACE THE PETROL TANK
Proceed in reverse order to removal. Screw firmly home the four fixing bolts and
interlace them, in pairs, with 22 gauge copper wire.
TO REMOVE THE ROCKER BOX
Remove the petrol tank.
Remove the three nuts and fibre washers retaining the rocker box side cover and take
away the cover.
Disconnect the oil pipe feeding oil to the rocker box.
Turn over engine until both valves are completely closed.
Remove engine steady bracket by removing bolt from frame clip and nuts and washers
from the rocker box bolt extensions.
Remove the nine bolts retaining rocker box to cylinder head.
Disconnect valve lifter cable.
Tilt upward the right hand side of rocker box and extract the two long pushrods. Lay
these aside so they may be identified and replaced in their original position.
The rocker box may then be lifted off.
TO REPLACE THE ROCKER BOX
Carefully clean the top of cylinder head and lower face of rocker box.
Revolve engine until both tappets are down, i.e., the top dead centre of firing stroke.
Lay the composition jointing washer on cylinder head. This must be faultless. If
necessary, renew.
Lay the rocker box in position then slightly raise the right hand side to allow the long
push rods to be inserted into their original respective positions.
Insert all nine rocker box fixing bolts and note that the bolt with short head Is In the
centre right hand position and the bolts with threaded extensions are fitted one each
side of the central short head bolt.
Tighten each bolt in turn bit by bit until all are fully home.
Replace the engine steady stay.
Turn engine over several times to ensure parts have bedded home.
Re-fix valve lifter cable.
Re-fix rocker box oil pipe union nut using two spanners to ensure that the union
screwed into rocker box does not turn while the nut is being tightened.
Check tappet clearances and re-set if necessary.
Inspect rubber fillet on rocker box side cover and renew if not perfect.
Replace the side cover ensuring that a fibre washer Is fitted under each of the three
retaining nuts.
Beware of over tightening these nuts, the joint being made by the rubber fillet
excessive pressure is not necessary.
Replace the petrol tank.
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