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THE
WHEELS,
TYRES
AND
JACKING
0
Each
road wheel
is filled with four large pegs which
locate
in
holes in
the
face
of
each wheel hub.
Make
certain
that these pegs
register con·cctly in
the holes
before
applying
the wheel
locknut.
If the wheel is filled
correctly the nut ;hould go
on
approximately six
turns.
Section
0.4
VALVES
Valve
caps,
in addition
to
preventing dirt from
entering
the
valve, fom1 a secondary
air
seal
and should always
be
filled.
The
valves
may be tested
for
airtightness
by
rotating
the
wheel until
the
valve is at
the
top and insert-
ing
its
end in
an
cggcup full of water.
If
bubbles appear
the
seating is faulty and
should
be
removed
and a
new
one
filled.
It
is
ad
visable to change
the
valve
interiors
every
12 months.
Section
0
.5
TYRE REMOVAL
Remove all
valve
parts to deflate the tyre completely,
and push both
edges
into the
base
of the rim at
a
point
diametrically opposite
the
valve. Lever the cover edge,
near the
valve, over
the
rim
of
the
wheel,
using
two
levers
at
intervals
of
6
in.
(15
em.)
apart.
NOTE.-
Do
not
attempt to stretch tbe edges of the tyre
CO'fer oYer the
rim
edge.
Force
is
entirely unnecessary and is
detrimental,
as it
ttnds
to
damage
the
wired edges. Fining or
removing
is
quite
easy if
the
tyre edges are carefully adjusted into the
Fig. 0.3
Remo•ing a winged hub nut
MGA
(Twin
cam).
Issue 2.
2n6s
Fig. 0.4
IS46C
The
11se
of
o tyre
le•·er
to ease
the
tyrc
bend
Jrotl!
tltl'
wheel
rim
rim
base;
if found difficult,
the operation is not
being
pctformed
correctly.
Remove
the tube carefully; do
n ot
pull on
the
valve.
Stand the tyre and wheel upright, keeping the bead on
the base of the rim. Lever the
bead
over
the
rim flange
and at
the
same
tinle
push the wheel away from the
cover with the
other
hand.
Section
0.6
IMPORTANCE
OF
BALANCE
To
obtain good steering it is of
imponance
to ensure
that
the wheels, with lyres fitted, arc in
good
balance.
Tyre manufacturers are now marking their tyres with
a white
spot
in the neighbourhood of the bead at the
lightest point of the cover;
similarly, they
are marking
the inner tubes
with
spots
to
indicate
their
heaviest poim.
When
tyres are assembled they must be
assembled
with
the spots
o
n the
cover coinciding with the spots
o
n
the
tube.
It
must be noted, in addition,
that
special
balancing
discs are fitted to
the
inside of some cover
casings and
that
these
should on no account
be
removed
as
tl1e
tyre
balance will be
upset
if this is done.
These
balance discs
are
not
repair patches and do not indicate any
faull
in
the
tyre.
Special balance weights which cover a range between
; oz. and 3!
oz.
in steps of
t
oz. are supplied
by
the
Dunlop
Rubber
Co.
for
attachment to the
wheel
rim
under Part Nos.
WBW{I to
7.
The
correct balance is 6 in.
(dynamic)
and
zero
(stn
t•c
).
The
balan<:e weights are lilted to both
sides
of the
wheel.
0.3
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