Centre Lock Wire Wheels.
Where centre lock wire wheels are fitted
it
is essential that the hubs, hub nuts
and inner portion of the wheel shell are kept clean and well lubricated.
Engine oil should be used for the latter purpose and not grease, particular atten-
tion being paid to the conical surfaces.
CARE
OF
TYRES.
Tyre Pressures.
The correct pressures are as follows
:-
5.50
X
16 :-28 p.s.i. all round.
6.40
x
15
:-24 p.s.i. all round.
For sustained high speed in excess of 90 miles per hour, the tyre pressures should
be increased to 34
p.s.i. all round for 5.50
x
16, and 30 p.s.i. for 6.40~ 15 tyres.
Pressures (including spare) should be checked and adjusted at least weekly.
This should be done when the tyres are cold and not when they have attained normal
running temperatures. Any unusual pressure loss should be investigated
and corrected.
Under-inflation has an adverse effect on the car and causes rapid and sometimes
irregular wear.
Also the casing may be damaged by excessive bending.
Changing Position of Tyres.
To obtain the best tyre mileage, equal wear, and to suppress the development
of irregular wear on front tyres, interchange front tyres with rear tyres at least
every 2,000 miles.
Tyre and Wheel Balance.
To provide smooth riding, precise steering and to avoid high speed steering
reaction, the tyres are balanced to predetermined limits.
By fitting the tyre so
that the white spots near the cover bead coincide with the black spots on the tube,
a high degree of balance is achieved.
If a higher degree of balance is required, the complete tyre and wheel assembly
should be balanced.
All wheel assemblies on JENSEN cars are balanced before leaving the factory
The original balance may be disturbed after a period of running.
It can be
checked, and,
if
necessary, corrected by any Service Station with tyre balance
equipment.
Factors Affecting Tyre Life.
The most important factors which have an adverse affect on tyre life are
:-
(l)
Incorrect tyre pressures.
(2)
Misalignment of wheels (See alignment of front wheels, Page 14).
(3)
High average speeds.
The rate of tread wear at 50 m.p.h. is nearly twice
as fast as at
30
m.p.h.
(4) Harsh acceleration.
(5) Frequent fierce braking.
(6) Warm dry weather.
The rate of tread wear in summer may be twice as
fast as during a cold and wet winter.
(7)
Bad road surfaces.
(8) Winding, cambered and abrasive roads.
Quite moderate speeds on such
roads will produce faster tread wear than much higher speeds on straight
flat roads.
PAGE
FIFTEEN
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