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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
spa
nner
(securing
nuts must be fitted
with
the
tape
r side
towards
the
wheel), and lower the
jack. Fully tighten the wheel
nuts
,
tightening them diagonally
and
prog
ressively,
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
hu
b nut
or
the
spanner
to slacken the
octa gonal
hub nut used.
WH EELS
AND rr YRE
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
spa re
wheel into
use.
Excessive local
distortion
as
a resul
t
o
f
striking a
kerb, a
loose
brick, a deep
pot-hole, etc.,
may cause the
casing cords to
fract
ure,
Tyres must
be mainta ined
at
the
prcssures
recommended on page 4
;
check
with an
accurate tyre
gauge at least
once a
week, and regula
te
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 norma
l
pressure
is
due to
temperature.
Regula
r
attention
must
also be
given
to
the spare
wheel.
See that the valve
caps
are screwed
down
fi rmly by
hand. The cap prevents
the entry of dirt
into the
valve
mechanism
and
forms
a
n additional seal on the
valve, preventing
any
leakage if the
valve
core is damag
ed.
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
left-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
lon
g
ru
n 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,
threads, and
cones of the
wheel and hub and then
lightly
coat them with grease. If a forced change
IS
made on the
road,
remo
ve, 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 ha
s
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 injur
ies
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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