ENGINE
these bearings will be that three set-
screws retaining the three rearmost
bearings will clearly be seen ontheleft-
hand side of the cylinder block. The
front bearing is pressed into the front
bearing sleeve.
The camshaft operates directly on flat
based hollow cylindrical chilled cast
iron tappets which in turn engage
hardened spherical-ended push rods,
the upper extremities of which are
hardened and cup-shaped, accommo-
dating hardened ball ended screws,
which are mounted on the outer ends
of the respective rockers. Camshaft
end thrust is taken by the flanged front
bearing, against the timing wheel and a
shoulder on the shaft itself. End float
is measured by a feeler gauge between
the camshaft chain wheel and the front
bearing housing or by a dial indicator.
To reduce the end float
a
replacement
bearing of increased length must be
fitted. To increase the end float it will
be necessary to rub the bearing down
on a sheet of emery cloth placed on a
surface plate to reduce its length.
The rockers are of case hardened steel
and provided with phosphor bronze
bushes which are lubricated under
pressure from the main oil supply.
The eight rockers themselves are car-
ried on a hollow rocker shaft which is
in turn mounted on four pedestal
brackets, the oil being fed along the
rocker shaft to the various rockers.
(i)
The
Cooling System, (see Section
"C")
is thermostatically controlled and
pressurised
;
an impeller pump is
utilised to assist the circulation of the
cooling fluid.
A
four-bladed 12:" fan is mounted on
rubber bushes and is attached to the
crankshaft. The fan pulley is drilled
in its outer periphery and aligning this
hole with a pointer welded to the
timing chain cover sets Nos. 1 and
4
pistons at T.D.C. (see Fig. 37).
The radiator is attached to the body at
the upper corners and secured to the
chassis at its sides.
(j)
The Fuel System (see Section "P")
incorporates a petrol shut off cock in
the pipe line from the tank to the pump,
this is situated on the left-hand chassis
member adjacent
:G
:he engine. Petrol
is supplied by an A.C. Type
UE
Pump
to the twin S.U. Type
H4
carburettors.
Each carburettor has its individual
A.C. air cleaner. The vacuum pipe to
the distributor is taken from the front
carburettor.
(k) The Hobourn-Eaton Double Rotor
Oil Pump (Fig.
14)
is of the sub-
merged type and is self priming
;
oil is
drawn from the engine sump through
a gauze filter. The oil is fed to the oil
gallery and to the Purolator oil filter.
(1) Coil Ignition is employed and the
distributor (Lucas DM.2 Type V.167)
has a vacuum and centrifugal auto-
matic advance incorporated. It is
suppressed for radio and television.
(m)
The Engine Mountings are of the
flexible type, the front bearer being
assembled on the rubber blocks on
either side of the chassis frame, the
gearbox itself being supported on a
rubber pad secured to a cross member
of the chassis frame.
(n) The Flywheel is manufactured from
cast iron and is fitted with a shrunken
starter ring of heat treated steel. It is
located on the crankshaft by a dowel
and secured by four bolts with lock
plates. The flywheel is marked by an
arrow which, when aligned with a
scribe line on the cylinder block, sets
Nos.
1
and
4
pistons at T.D.C.
When fitting the flywheel to the
crankshaft ensure that both compo-
nents are free from burrs. After fitting,
the run-out should be checked by a
D.T.I. to ensure the run-out does not
exceed
.003". Failure to observe this
point may lead to clutch disorders
and vibration.
There are two dowel holes in the fly-
wheel
90" removed from one another
;
this will enable the flywheel to be
turned 90" should the teeth of the
starter ring gear become increasingly
worn and a replacement not be readily
available. It must be
remembeied that
the timing mark must be obliterated
and a second stamped on the flywheel.
(0) To Fit Replacement Starter Ring
Gear. When it is necessary to fit a re-
placement ring gear, certain pre-
cautions should be taken to ensure
its
fiiture
Efe.
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