Valve Timing.
Both the camshaft gear and the crankshaft gear are spot marked for valvesetting;
the inlet valve opens at
5"
B.T.D.C.
Ignition.
Ignition coil with automatic advance and retard assisted by vacuum control.
Ignition Timing.
In order to reset the ignition timing, remove all spark plugs except that from
No.
1
cylinder and using the starting handle rotate the engine until No.
1
piston
is at T.D.C. before firing stroke. The compression felt at the handle will denote
the correct stroke. T.D.C. of No.
1
piston is marked on the flywheel
(116).
Set Micrometer adjustment to zero.
Remove the distributor cap and slacken pinch bolt of the distributor clamp.
Turn distributor casing until the contact breaker points just begin to open,
with the rotor arm pointing to the relative position of No.
1
cylinder electrode
in the distributor cap. The spark is then correctiy timed.
Finally, retighten the pinch bolt in the clamping plate and refit the distributor cap.
Finer adjustment can be obtained under road conditions by means of
the micrometer adjustment.
Lubrication.
A
pressure gear pump forces oil from a fin cooled cast aluminium sump to all
main, big end and camshaft bearings.
Each main bearing oil feed is supplied from a
circular channel cut in the bearing housing which provides a uniform feed of oil
between the bearing surfaces.
Big end bearing lubrication, controlled by a special oil feed in the crankshaft
also provides for jet lubrication of the cylinder walls, while oil from the camshaft
front bearing
is
guided by deflectors fitted to the camshaft gear on the timing chain.
The valve rocker shaft
is
fed by oil on the camshaft rear centre bearing.
Oil
capacity
15
pints plus
2
pints for full flow Tecalemit filter.
COOLING
SYSTEM.
Cooling.
Circulation of the coolant is by a large outlet centrifugal pump with athermostat
to assist rapid warming from cold.
The system is pressurised
andda spring loaded flap is provided to give further
control, should this be necessary. "The flap control is situated above the brake
pedal and should be used in
conjuoction with the coolant thermometer. To close
the flap, it is necessary to pull the control handle and vice versa. Capacity of the
cooling system
is
31
pints.
Topping Up.
Coolant level should be checked weekly.
Top up when necessary to replace
coolant lost through evaporation. Use only rainwater, if available, and
fill
to approximately
4
in. below the top of the header tank when engine is cold.
PAGE
TWENTY-TWO
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