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Weekly checks
1•8
Tyre Tread Wear Patterns
Shoulder Wear
Underinflation
(wear on both sides)
Check and adjust pressures
Incorrect wheel camber
(wear on one side)
Repair or renew suspension
parts
Hard cornering
Reduce speed!
6 Over-inflation will cause rapid wear of the
centre part of the tyre tread, coupled with
reduced adhesion, harsher ride, and the
danger of shock damage occurring in the tyre
casing.
7 Regularly check the tyres for damage in the
form of cuts or bulges, especially in the
sidewalls. Remove any nails or stones
embedded in the tread before they penetrate the
tyre to cause deflation. If removal of a nail does
reveal that the tyre has been punctured, refit the
nail so that its point of penetration is marked.
Then immediately change the wheel, and have
the tyre repaired by a tyre dealer. Do not drive on
a tyre in such a condition. If in any doubt as to
the possible consequences of any damage
found, consult your local tyre dealer for advice.
8 Periodically remove the wheels, and clean
any dirt or mud from the inside and outside
surfaces. Examine the wheel rims for signs of
rusting, corrosion or other damage. Light alloy
wheels are easily damaged by "kerbing" whilst
parking, and similarly steel wheels may
become dented or buckled. Renewal of the
wheel is very often the only course of remedial
action possible.
9 The balance of each wheel and tyre
assembly should be maintained to avoid
excessive wear, not only to the tyres but also
to the steering and suspension components.
Wheel imbalance is normally signified by
vibration through the vehicle's bodyshell,
although in many cases it is particularly
noticeable through the steering wheel.
Conversely, it should be noted that wear or
Centre Wear
Overinflation
Check and adjust pressures
If you sometimes have to inflate
your car's tyres to the higher
pressures specified for maximum
load or sustained high speed,
don't forget to reduce the
pressures to normal afterwards.
damage
in
suspension
components may cause excessive tyre wear.
Out-of-round or out-of-true tyres, damaged
wheels, and wheel bearing wear also fall into
this category. Balancing will not usually cure
vibration caused by such wear.
10 Wheel balancing may be carried out with
the wheel either on or off the vehicle. If
balanced on the vehicle, ensure that the
wheel-to-hub relationship is marked in some
way prior to subsequent wheel removal, so
that it may be refitted in its original position.
11 General tyre wear is influenced to a large
degree by driving style - harsh braking and
acceleration, or fast cornering, will all produce
more rapid tyre wear. Interchanging of tyres
may result in more even wear. However, if this
is completely effective, the added expense is
incurred of replacing all four tyres at once,
which may prove financially-restrictive for
many owners.
12 Front tyres may wear unevenly as a result
of wheel misalignment. The front wheels
should always be correctly aligned according
to the settings specified by the vehicle
manufacturer.
13 Legal restrictions apply to many aspects
of tyre fitting and usage, and in the UK this
information is contained in the Motor Vehicle
Construction and Use Regulations. It is
suggested that a copy of these regulations is
obtained from your local police, if in doubt as
to current legal requirements with regard to
tyre type and condition, minimum tread depth,
etc.
Toe Wear
Incorrect toe setting
Adjust front wheel alignment
Note: The feathered edge of
the tread which characterises
toe wear is best checked by
feel.
or
steering
5 Electrical system check
Check the operation of all the electrical
equipment, ie. lights, direction indicators,
horn, washers, etc. Refer to the appropriate
Sections of Chapter 13 for details if any of the
circuits are found to be inoperative.
Visually
connectors, harnesses and retaining clips for
security, and for signs of chafing or damage.
Rectify any faults found.
6 Battery electrolyte level check
Caution: Before carrying out any work on the
vehicle battery, read through the precautions
given in "Safety first!" at the beginning of this
manual.
1 The battery fitted as original equipment is
"maintenance-free",
maintenance apart from having the case kept
clean, and the terminals clean and tight.
2 If a "traditional" type battery is fitted as a
replacement, remove the old cell covers and
check that the plate separators in each cell are
covered by approximately 6 mm (0.25 in) of
electrolyte. If the battery case is translucent,
the cell covers need not be removed to check
the level. Top-up if necessary with distilled or
de-ionized water; do not overfill, and mop up
any spillage at once (see illustration).
Uneven Wear
Incorrect camber or castor
Repair or renew suspension
parts
Malfunctioning suspension
Repair or renew suspension
parts
Unbalanced wheel
Balance tyres
Out-of-round brake disc/drum
Machine or renew
check
all
accessible
wiring
and
requires
no
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