Apply jointing compound to both the inner and outer cover faces, place the paper washer and outer
cover in position, replace the Phillips screws and the one 4" nut over the stud at the top of the cover together
with one shakeproof washer and replace the -&" nut and bolt at the front end of the cover. This bolt also carries
the starter motor support bracket when a starter motor is fitted.
Refit the automatic advance mechanism and cam so that the keyway in the end of the cam is at the bottom
or at 6 o'clock. Replace the contact breaker so that the condenser with the black and white lead is on the left
hand, and the nuts and washers are approximately central in the elongated slots. In this position the contact
breaker points should be set just about to open. Reset ignition timing as described in Service Sheet No. 1008.
Before replacing the contact breaker cover see that the black and white lead is brought outside the left hand
long nut and that the rubber grommet is correctly engaged in the U shaped slot in the cover. Slide the cover into
position and secure by the two ~-" screws.
Make sure that the cylinder bores are clean and that there is a liberal coating of clean engine oil, fit a new
cylinder head gasket with the thin raised portion around each cylinder bore facing upwards.
Having previously assembled the valves and valve rockers in the cylinder head as described in Service
Sheet No. 1006, prepare to replace together with the four push rods.
The simplest method of
carrying this out is to apply a
dab of grease to the cup of
each push rod, then press
each rod, on to the ball end
of the rocker arm. The grease
will hold the rods in position
while the head is being fitted
over the studs. Slacken off
the rocker adjusting screws,
replace the seven cylinder
head nuts and plain washers
and tighten down evenly and
securely.
Do not fully tighten one
nut at a time as this might
distort the cylinder head and
result in leakage at the joint.
See Fig. 19 for order of
tightening.
When the cylinder head
has been finally fitted reset
the rocker adjusting screws
in the following manner.
With the right hand exhaust valve fully open set the left hand exhaust valve clearance to
•0
05", then with
the left hand exhaust valve fully open repeat the operation on the right hand exhaust valve. This procedure is
the same for the inlet valves.
Replace the rocker box cover and gasket, making sure that the gasket is correctly located, and place on the
two fibre washers, plain washers and the two nuts, but do not tighten these two nuts until the engine is finally
set in the frame and the support bracket to the petrol pipe is replaced over the left hand stud.
Re-assembly of the unit is now completed and it -
•i
s ready for re-fitting into the frame, but it will facilitate
the replacement of oil if it is now added to the primary drive case, the gearbox and the rear transmission.
Replenishment of the oil in the sump can be left until the unit is in the frame.
Fig. 19.
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