WHEELS AND TYRES
Removing and replacing the wheels (pressed type)
Slacken the four nuts securing the
road
wheel to the
hub;
turn anti-clock-
wise to loosen and clockwise to tighten. Raise the car with the jack (page 31)
to lift the wheel clear of the ground and remove the nuts. Withdraw the
road
wheel from the hub. When refitting the road wheel locate the wheel on the hub,
lightly tighten the nuts with the wheel nut spanner (securing nuts must be fitted
with the
taper side towards the wheel), and lower the jack. Fully tighten the wheel
nuts, tightening them diagonally and progressively, at the same time avoid
over-tightening.
Replace the hub cover and jack socket plug.
Removing and replacing the wheels (wire type)
Use the mallet to slacken the winged hub nut or the spanner to slacken the
octagonal hub
nut
used.
WHEELS AND rrYRE
Tyre maintenance
To obtain the best tyre mileage and to suppress the development
of
irregular
wear on the tyres the wheels can be interchanged diagonally bringing the spare
wheel into use.
Excessive local distortion as a result
of striking a kerb, a loose brick, a deep
pot-hole, etc., may cause the casing cords to
fract ure,
Tyres must be maintained at the prcssures recommended on page 4; check
with an accurate tyre gauge at least once a week, and regulate as necessary. Pres-
sures should be checked when the tyres arc cold; do not reduce the pressure in
warm tyres where the increase above the normal pressure is due to temperature.
Regular attention must also be given to the spare wheel.
See
that
the valve caps are screwed down firmly by hand. The cap prevents
the entry of dirt into the valve mechanism and
f
orm
s an additional seal on the
valve, preventing any leakage if the valve core is damaged.
Flints
and
other sharp objects should be removed with a penknife or similar
tool. If neglected, they may work through the cover.
A9
590
(Lef t) Turn the winged hub
nuts clockwise to unscrew
on the right-hand side
of
the
car and anti-clockwise on
the
lef
t-hand side
(Right) Remo ving the road
wheel securing nuts (pressed
type)
A section through a tubeless
tyre, showing
(1) the air
retaining liner,
(2) the rubber
air seal,
(3) the rubber-
sealed valve
A9618
Care
of
wire wheels
(1) When the car is new, after the first long run or after 50 miles (80 km.)
of short runs,
jack
up the wheels and hammer the nuts to make sure that
they are tight.
(2) Always jack up a wheel before using the hammer, and always hammer
the nuts tight.
(3) Locknuts are marked 'LEFT' or
'RIGHT
' to show to which side of the
car they must be fitted, and also with the word
'UNDO
'
and
an arrow.
(4) Before replacing a wheel wipe all serrations,
thr
eads, and cones of the
wheel
and
hub
and
then lightly coat them with grease. If a forced change
IS
made on the
road
, remove, clean,
and
grease as soon as convenient,
(5) Once a year remove the wheels for examination
and
regreasing.
32
Any oil or grease which may get onto the tyres should be cleaned off by using
fuel sparingly. Do not use paraffin (kerosene), which has a detrimental effect
on rubber.
With tubeless tyres penetration does not normally result in deflation and the
tyres should be repaired when convenient. Penetrations by objects of small
diameter can be repaired with the tyre manufacturer's plugging kit, while more
extensive damage requires the removal of the tyre for vulcanizing.
When repairing tubes have punctures or injuries vulcanized. Ordinary patches
should only be used for emergencies.
Vulcanizing is absolutely essential in the case of tubes manufactured from
synthetic rubber.
33
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