Porsche Cayman (2010 year). Manual

Danger!

Tires/Wheels

Risk of loss of control and serious personal

The original equipment tires and wheel rims on

injury or death.

your Porsche comply with all applicable Federal

Motor Vehicle Safety Standards.

If while driving, your vehicle experiences a sud-

den vibration or ride disturbance, and/or you

For your safety remember the following:

suspect that possible damage to your tires or

vehicle has occurred, you should immediately

Wheel rims and wheel bolts are matched to fit

reduce your speed without excessive use of

your Porsche.

the brakes.

If you intend to use other than original equip-

ment wheels, be sure that they conform to

Stop the vehicle as soon as possible, and in-

Porsche specifications for your model.

spect the tires.

Only tires with the same make and with the

If you cannot determine the cause for the dis-

turbance, have your vehicle towed to the near-

same specification code (e.g. “N0”, “N1”...)

est Porsche or tire dealer to have your vehicle

can be mounted.

or tire(s) inspected.

The use of wheel rims and wheel bolts that do

Continuing to operate the vehicle without cor-

not meet specifications of the original factory

rection could result in a loss of control and

Example

installed equipment will affect the safe opera-

serious personal injury.

tion of your vehicle.

Uniform Tire Quality Grading

Before you plan on exchanging wheels, or

snow tires already mounted on the wheel rims,

Quality grades can be found where applicable on

consult your authorized Porsche dealer. Your

the tire sidewall between tread shoulder and max-

dealer has the technical information necessary

imum section width.

to advise you which wheel rims and wheel bolts

are compatible with the original factory instal-

All passenger car tires must conform to Federal

lations.

Safety Requirements in addition to these grades.

Treadwear

The treadwear grade is a comparative rating

based on the wear rate of the tire when tested

under controlled conditions on a specific govern-

ment test course.

For example, a tire graded 150 would wear one

Practical Tips, Emergency Service

213

and a half (1-1/2) times as well on the government

tire failure.

Cold tire inflation pressure means: all tires

course as a tire graded 100.

The grade C corresponds to a level of perform-

must be cold, ambient temperature maximum

The relative performance of tires depends upon

ance which all passenger car tires must meet un-

(68 °F/20 °C), when adjusting the inflation

the actual conditions of their use, however, and

der the Federal Motor Vehicle Safety Standard No.

pressure.

may depart significantly from the norm due to var-

109.

Avoid sunlight striking the tires before measur-

iations in driving habits, service practices and dif-

Grades B and A represent higher levels of per-

ing cold pressures, since the pressures would

ferences in road characteristics and climate.

formance on the laboratory test wheel than the

rise from temperature influence.

minimum required by law.

Valve caps protect the valve from dust and dirt,

Traction AA, A, B, C

and thus from leakage.

The traction grades, from highest to lowest, are

Warning!

Always screw caps tightly down.

AA, A, B, and C and they represent the tire’s ability

The temperature grade for this tire is established

Replace missing caps immediately.

to stop on wet pavement as measured under con-

for a tire that is properly inflated and not overload-

Use only plastic valve caps.

trolled conditions on specified government test

ed.

surfaces of asphalt and concrete.

Do not use commercially available sealant or

Excessive speed, underinflation, or excessive

A tire marked C may have poor traction perform-

tire inflating bottles. Only use Porsche

loading, either separately or in combination, can

ance.

cause heat buildup and possible tire failure, result-

approved tire sealant.

ing in serious personal injury or death.

Warning!

Please see the chapter “TIRE PRESSURE FOR

COLD TIRES (68 °F/ 20 °C)” on Page 267.

The traction grade assigned to this is based on

Tire pressures

braking (straight-ahead) traction tests and does

not include cornering (turned) traction, accelera-

Warning!

tion, hydroplaning or peak traction characteris-

tics.

Incorrect tire pressure causes increased tire

wear and adversely affects road handling.

This could lead to tire failure, resulting in loss

Temperature A, B, C

of control, leading to serious personal injury

The temperature grades are A (the highest), B and

or death.

C, representing the tire’s resistance to the gener-

f Always use an accurate tire pressure gage

ation of heat and its ability to dissipate heat when

when checking inflation pressures.

tested under controlled conditions on a specified

indoor laboratory test wheel.

f Do not exceed the maximum tire pressure list-

Sustained high temperatures can cause the mate-

ed on the tire sidewall.

rial of the tire to degenerate and reduce tire life,

Please see the chapter “TIRE PRESSURE PLA-

and excessive temperature can lead to sudden

TE” on Page 265.

214 Practical Tips, Emergency Service

Each tire, including the spare (if provided) should

f Never let air out of hot tires.

be checked monthly when cold and inflated to the

This could cause the tire pressure to fall below

inflation pressure recommended by the vehicle

the prescribed value.

manufacturer on the vehicle placard or tire infla-

Insufficient tire filling pressure can cause tires to

tion pressure label. (If your vehicle has tires of a

overheat and thus be damaged - even invisibly.

different size than the size indicated on the vehicle

Hidden tire damage is not eliminated by subse-

placard or tire inflation pressure label, you should

quently correcting the tire pressure.

determine the proper tire inflation pressure for

those tires.)

Overloading

As an added safety feature, your vehicle has been

equipped with a tire pressure monitoring (TPM)

Danger!

that illuminates a low tire pressure telltale when

Risk of damage to vehicle parts, loss of con-

one or more of your tires is significantly under-in-

trol and serious personal injury or death.

flated. Accordingly, when the low tire pressure tell-

tale illuminates, you should stop and check your

f Do not overload your vehicle. Be careful about

tires as soon as possible, and inflate them to the

the roof load.

proper pressure. Driving on a significantly under-

f If loading the vehicle also correct the tire pres-

inflated tire causes the tire to overheat and can

sure. Tire pressure for loaded vehicle can be

Example of a tire pressure plate

lead to tire failure. Under-inflation also reduces

found on the tire pressure plate and in the

fuel efficiency and tire tread life, and may affect

chapter technical data.

Tire pressure plate

the vehicle’s handling and stopping ability.

f Never exceed the specified axle load.

Please note that the TPM is not a substitute for

Information on the tire pressure plate

Overloading can shorten the service life of the

proper tire maintenance, and it is the driver’s re-

tires and car, as well as lead to dangerous ve-

A Seating capacity

sponsibility to maintain correct tire pressure, even

hicle reactions and long braking distances.

Maximum number of vehicle occupants, inclu-

if under-inflation has not reached the level to trig-

Damage due to overloading is not covered by

ding the driver.

ger illumination of the TPM low tire pressure tell-

the vehicle warranty.

tale.

f On vehicles with tire pressure monitoring:

f Please see the chapter “LOADING INFORMA-

Please see the chapter “TPM TIRE PRESSURE

TION” on Page 224.

MONITORING” on Page 151.

f Please see the chapter “TIRE PRESSURE FOR

When tires are warm, the tire pressure is

COLD TIRES (68 °F/ 20 °C)” on Page 267.

increased.

Practical Tips, Emergency Service

215

B Vehicle load limit

Tire traction

Tire wear

Is the maximum total weight limit specified of

the load (passengers and cargo) for the vehi-

Warning!

The original equipment tires on your Porsche have

cle. This is the maximum weight of passengers

built-in tire wear indicators. They are molded into

When driving on wet or slushy roads, a

and cargo that can be loaded into the vehicle.

the bottom of the tread grooves and will appear as

wedge of water may build up between the

Please see the chapter “LOADING INFORMA-

approximately 1/2 in. (12 mm) bands when the

tires and the road. This phenomenon is

TION” on Page 224.

tire tread depth is down to 1/16 of an in.

known as “hydroplane” and may cause par-

(1.6 mm).

C Tire size for the front axle

tial or complete loss of traction, vehicle

Check with your authorized Porsche dealer

control or stopping ability.

When the indicators appear in two or more adja-

about the current release status.

cent grooves, it is time to replace the tires. We

f Reduce speed on wet surface to prevent this.

recommend, however, that you do not let the tires

D Recommended tire pressure for the front axle

wear down to this extent.

These values are for cold tires (68 °F/20 °C).

Worn tires cannot grip the road surface properly

Tire life

E Tire size for the rear axle

and are even less effective on wet roads.

Check with your authorized Porsche dealer

Tire life depends on various factors, i. e., road

Snow tires lose their traction capability when their

about the current release status.

surfaces, traffic and weather conditions, driving

tread depth falls below 5/32 in. (4 mm).

F Recommended tire pressure for the rear axle.

habits, type of tires and tire care.

In the United States, state laws may govern the

These values are for cold tires (68 °F/20 °C).

f Inspect your tires for wear and damage before

minimum tread depth permissible. Follow all such

G In vehicles with collapsible spare wheel:

driving off. If you notice uneven or substantial

laws.

wear, wheels might need alignment or tires

Size and tire pressure of the spare wheel.

should be balanced or replaced.

216 Practical Tips, Emergency Service

Danger!

Tire care

Tire damage, puncture

Driving on worn tires can result in loss of con-

Avoid damaging tires and wheel rims.

High-pressure cleaning units can damage the

trol of the vehicle and could cause serious

tires.

personal injuries or death.

If you must drive over a curb or other obstacle,

drive slowly and at an obtuse angle.

f Please see the chapter “HIGH-PRESSURE

f Do not drive with worn tires or tires showing

CLEANING UNITS, STEAM CLEANERS” on

cuts or bruises as they may lead to sudden

Check tires for uneven wear and damage

Page 203.

deflation and loss of control which could cause

before driving off.

severe personal injury.

f Check tires for imbedded material, cuts, punc-

Remove imbedded material.

tures, cracks and bulges (side wall) before driv-

f Specialized high performance tires on high

Replace worn or damaged tires immediately.

ing off.

performance sports cars exhibit more wear

than those on a family sedan, or even a high

Keep oil, fuel, brake fluid, etc. away from tires.

In case of tire damage, where it is uncertain wheth-

performance sedan.

er there is a break in the ply with all its conse-

Replace missing valve stem caps.

Therefore, it is important to check your tire

quences or tire damage caused by thermal or me-

pressure and condition at least every two

Keep tires inflated correctly.

chanical overloading due to loss of pressure or

weeks.

any other prior damage, we recommend that the

Wash tires when washing the vehicle. Also

tire be replaced for safety reasons.

clean inner side of wheels.

If you notice that tires are wearing unevenly, con-

If one faulty tire is replaced it should be noted that

sult your Porsche dealer.

Do not use abrasive cleaners when washing

the difference in tread depth on one axle must not

Uneven wear may not always be due to improper

the wheels.

exceed 30%.

wheel alignment. It can be the result of individual

Check wheel rims for corrosion.

Handling inconsistencies may result.

driving habits such as cornering at high speeds. If

the tire pressure is not checked and adjusted

Remove road salt, if driving in winter.

f Perform a visual inspection if necessary.

regularly, abnormal tire wear can also occur.

Practical Tips, Emergency Service

217

Danger!

Tire replacements

If new tires are installed only on one axle, a notice-

able change in handling occurs due to the different

Risk of serious personal injury or death.

If in doubt, contact your Porsche dealer.

tread depth of the other tires.

Driving the vehicle with low tire pressure

Use only tire makes and types approved by

This happens especially if only rear tires are re-

increases risk of a tire failure and resulting

Porsche.

placed. However, this condition disappears as the

loss of control. Furthermore, low tire pres-

new tires are broken in.

sure increases rate of wear of the affected

If you do not use a Porsche recommended

tires.

f Please adjust your driving style accordingly.

replacement tire, make sure that you

Check tires - including sidewalls - regularly for

purchase your new tires from a reputable tire

Installation of new tires should only be done by a

foreign bodies, nicks, cuts, cracks and bulges.

dealer and that the dealer complies with all

qualified tire technician.

manufacturers warnings for those tires.

After driving off road, examine tires for signs

Valves

of damage such as cuts, tears, bulges or for-

Only tires with the same make and with the

eign objects stuck in the tread. Replace a dam-

same specification code (e.g. “N0”, “N1”...)

Rubber valve stems must be replaced every time

aged tire if necessary.

a tire is replaced.

can be mounted.

For metal valves, the installation and replacement

Cross curb edges slowly and at right angles if

instructions must be observed.

Before mounting new tires, check with your

possible.

Porsche dealer about the current release

f Use only genuine Porsche metal valves.

Avoid driving over steep or sharp curbs.

status.

In cases of doubt, have the wheel (particularly

f Protect the valve inserts against soiling with

Use tires with “ZR” quality standards. There

the inner side) checked by an authorized

valve caps.

are currently no standards concerning tire

Porsche dealer.

Soiled valve inserts can cause a gradual loss

strength at speeds above 150 mph (240 km/h).

of air.

Tires should be replaced no less than on one axle

f Use only plastic valve caps.

at the time.

Only tires of the same make and type must be

used. Mixed tires are not permissible.

Initially, new tires do not have their full traction.

You should therefore drive at moderate speeds

during the first 60 - 120 miles (100 - 200 km).

218 Practical Tips, Emergency Service

Parking at the curb

Wheel alignment, wheel balancing

Wheels with Tire Pressure Monitoring

(TPM) sensors

Warning!

As a precaution, have wheels with summer tires

balanced in the spring, and those with mud and

Before changing wheels, make sure that the

Hard impacts against curbs (or traffic

snow tires before winter.

wheels are compatible with your vehicle's TPM.

islands) are dangerous and may cause hid-

Unbalanced wheels may affect car handling and

den tire damage which is not noticeable until

f Check this with your authorized Porsche

tire life.

later. Such damage can result in accidents at

dealer.

Only the specified weights may be used for wheel

high speeds causing serious personal injury

balancing.

or death.

Removing and storing tires

Self-adhesive weights must not come into contact

Depending on the force of impact, the edge

with cleaning agents, since they could drop off.

of the rim can also be damaged.

f After changing, adjust tire pressure and torque

Uneven tread wear indicates wheel imbalance. In

wheel bolts diagonally to 94 ftlb (130 Nm).

f If you are in doubt, have the wheel checked by

this event, the vehicle should be checked at an au-

an expert, particularly if you suspect damage

thorized Porsche dealer.

Tires must always remain on the same side of

on the inside.

the vehicle.

Warning!

When wheels are removed, the direction of

f If you must drive over a curb or other obstacle,

rotation and position of each wheel should be

drive slowly and at an obtuse angle. Exercise

If, during a trip, uneven running or vibrations

marked.

care when parking along curbs.

occur that could be caused by damage to

tires or the car, the speed must be reduced

Example

immediately, but without braking sharply.

If you continue your trip without having the

FR (front right), FL, RR and RL.

cause of the fault remedied, you might lose

Wheels must always be fitted in accordance with

control of your vehicle which could cause se-

their marking.

rious personal injury or death.

The perception that tire durability and perform-

f Stop the vehicle and check the tires.

ance are immune to the effects of storage and

f If no cause for the fault can be found, drive

age is unfounded.

carefully to the nearest authorized Porsche

Chemical additives, which make the rubber elas-

dealer.

tic, lose their effectiveness in the course of time

and the rubber becomes brittle and cracks.

Therefore, the tires should be inspected from

time to time.

Practical Tips, Emergency Service

219

Note

Before mounting snow tires, consult with

Danger!

your Porsche dealer. He has the technical

Under no circumstances should tires older than 6

Risk of accident and serious personal injury

information necessary to advise you on

years be used on your Porsche.

or death due to excessive speed.

wheel and tire compatibility.

The age of the tire can be obtained from the “DOT”

f Always check the maximum speed rating on

Snow tires should have the same load capacity as

code number. If, for example, the last four num-

the tire sidewall on any tire on the vehicle.

original equipment tires and should be mounted on

bers read 1208, then the tire was produced in the

all four wheels.

f Never exceed the maximum speed rating of

12th week of 2008.

Snow tires with studs should be run at moderate

the tires.

f Store tires in a cool and dry place.

speeds when new in order to give the studs time

to settle.

f Fit winter tires to both axles well before the

Snow tires

cold season begins.

Danger!

Your authorized Porsche dealer will be pleased

For a better grip on snow and ice, use radial M+S

to advise you.

Tires with badly worn treads and studs are

tires with studs.

very dangerous and could cause accidents

Check with your local Motor Vehicle Bureau for

Maintenance note

resulting in serious personal injuries or

possible restrictions.

We recommend fitting snow tires on the vehicle at

death.

temperatures below 45 °F (7 °C) since the driving

Danger!

f Make sure they are replaced immediately.

performance of summer tires is reduced at low

temperatures. Summer tires may be permanently

Risk of loss of control and damage to the

f Do not drive a vehicle equipped with snow tires

damaged at extremely low temperatures.

vehicle as well as serious personal injury or

at prolonged high speed.

death.

Winter tires lose their traction capability when their

Snow tires do not have the same degree of

The standard tires profile and rubber mixture

tread depth falls below 5/32 in. (4 mm).

traction on dry, wet or snowfree roads as a

are optimized for wet and dry driving condi-

normal tire.

tions, and may not prove favorable for snow

Furthermore, snow tires wear rapidly under

conditions.

these conditions.

f Therefore install M+S tires before driving in

Comply with all state and local laws

such conditions.

governing snow tire and tread depth

requirements.

220 Practical Tips, Emergency Service

Snow chains

Fitting snow chains

The use of snow chains is not permitted when

Caution!

5 mm spacers are mounted.

Risk of damage to body, axle or brake com-

ponents.

Caution!

f Fit snow chains only to the rear wheels, and

Risk of damage to the wheel housings if the

only with the tire/rim combination listed in the

5 mm spacers are not removed before fitting

Technical Data.

snow chains.

To ensure adequate clearance between chain

f To permit the fitting of snow chains, have the

and body, Porsche recommends only the use

5 mm spacers removed on all 4 wheels.

of fine-link chains such as those approved by

Porsche.

f To fit/remove the spacers:

f Follow instructions issued by the supplier of

Please consult an authorized Porsche dealer.

the chains.

f Please see the chapter “SPACERS” on

Page 233.

Different states and countries have varying statu-

tory requirements regarding maximum speed.

Check with local authorities for possible restric-

Tire designations

tions.

Due to new speed and load ratings for radial tires,

f Remove chains as soon as the roads are free

new designations have come into force for snow

of ice and snow.

tires for your Porsche.

The designation to be used for ZR tires is e.g.,

265/40 ZR 18 (Z = code letter for radial tires for

speeds above 150 mph / 240 km/h).

Practical Tips, Emergency Service

221

B TIN (Tire Identification Number)

Example: DOT xx xx xxxx xxxx

- DOT

The DOT symbol indicates that the tires com-

ply with the requirements of the US Depart-

ment of Transportation and provides informa-

tion about:

- first two-digit code means manufacturer’s iden-

tification mark.

- second two-digit code means tire size.

- third four-digit code means tire type code.

- fourth four-digit code means date of manufac-

ture.

If, for example, the last four numbers read

0208, the tire was produced in the 2nd week

Example of Inscription

ZR - code letter for radial tires for speeds

of 2008.

above 150 mph / 240 km/h

Inscription on radial tire

C Tire ply composition and material

There are currently no standards concerning

The number of layers in the tread and sidewalls

tire strength at speeds above 150 mph

A Tire size

and their material composition.

(240 km/h).

Example: P 295/30 ZR 19 100 Y

D Maximum permissible inflation pressure

R - Belt type code letter for radial

– P - The tire is designed for Passenger vehicle.

19 - Indication of rim diameter in inches

The maximum permissible cold inflation pressure

This information is not included on all tires.

to which a tire can be inflated.

–

100 - Load capacity coefficient

295 - Indication of tire width in mm

f Do not exceed the permissible inflation

–

Y - Speed code letter

–

30 - Indication of tire height to tire width ratio

pressure.

in percent

XL (Extra Load) - Tire with increased load rat-

ing

222 Practical Tips, Emergency Service

E Maximum Load rating

Tip on driving

The maximum load in kilograms and pounds can

Tires with a maximum speed rating that is lower

be carried by the tire. If you replace tires always

than the specified maximum vehicle speed may be

use a tire that has the same maximum load rating

mounted only if they bear an M+S identification on

as the factory installed tire.

the tire sidewall.

F Radial

f Please note that in addition to the winter tires,

all-season and all-terrain tires are also subject

The identification indicates if the tire has radial

to speed limits and bear this identification.

structure.

G Term of tubeless or tube tire

Inscription on light alloy wheels

Identification for tubeless tires.

Maintenance note

f Protect the valve inserts against soiling with

Speed code letter

valve caps.

The speed code letter indicates the maximum per-

Use only plastic valve caps.

missible speed for the tire.

Soiled valve inserts can cause a gradual loss

This code letter is shown on the tire sidewall.

of air.

A - Rim width in inches

B - Rim-flange contour code letter

= up to 118 mph (190 km/h)

Note on operation

C - Symbol for drop-center rim

= up to 131 mph (210 km/h)

D - Rim diameter in inches

f The rim width in inches A and the rim offset F

E - Double hump

= up to 150 mph (240 km/h)

are visible from the outside.

F - Rim offset in mm

The information is inscribed on the back of the

= up to 167 mph (270 km/h)

spokes near the tire valve.

= up to 186 mph (300 km/h)

(Y)

= up to 186 mph (300 km/h) as for

Y tires. Speeds of more than

300 km/h (186 mph) are also

possible at a maximum tire load

capacity of 85 % (confirmation from

tire manufacturer required for

speeds of more than 186 mph (300

km/h)).

Practical Tips, Emergency Service

223

The Gross Combined Weight Rating is the

Danger!

Loading Information

maximum total weight rating of vehicle, passen-

Risk of loss of control, damage to the vehicle

gers and cargo.

Definitions

and serious personal injury or death.

The Vehicle Capacity Weight - Load Limit - is

Never exceed the specified axle loads.

The Curb weight - actual weight of your vehicle -

the maximum total weight limit specified of the

Overloading can shorten the service life of the

vehicle weight including standard and optional

load (passengers and cargo) for the vehicle. This

tires and car, as well as lead to dangerous

equipment, fluids and emergency tools. This

is the maximum weight of passengers and cargo

vehicle reactions and long braking distances.

weight does not include passengers and cargo.

that can be loaded into the vehicle. This informa-

Damage due to overloading is not covered by

tion can be found on the tire pressure plate.

The Gross Vehicle Weight is sum of the curb

the vehicle warranty.

weight and the weight of passengers and cargo

The maximum loaded vehicle weight is the

combined.

sum of curb weight, accessory weight, vehicle ca-

pacity weight and production options weight.

The Gross Vehicle Weight Rating is the maxi-

mum total weight of vehicle, passengers, luggage

The load rating is the maximum load that a tire

and optional equipment.

is rated to carry for a given inflation pressure.

The Gross Axle Weight Rating is the maximum

The maximum load rating is the load rating for

load limit for the front or the rear axle. This infor-

a tire at the maximum permissble inflation pres-

mation is located on the safety compliance sticker

sure.

located in the driver’s side door jamb.

The cargo capacity is the permissible weight of

For determining the compatibility of the tire and

cargo, the substracted weight of passengers from

vehicle load capabilities:

the load limit.

f Please see the chapter “TECHNICAL DATA” on

f Never exceed the permissible limits.

Page 266.

The load capacity coefficient (e.g. “100”) is a min-

imum requirement.

224 Practical Tips, Emergency Service

Determining the combined weight of

3. Subtract the combined weight of the driver and

occupants and cargo:

passengers from XXX kilograms or XXX

pounds.

f Add the weight of all occupants and then add

the total luggage weight (figure).

4. The resulting figure equals the available

amount of cargo and luggage load capacity.

Steps for determining correct load limit

For example, if the ”XXX“ amount equals

1. Locate the statement "The combined weight of

400 lbs. and there will be two - 150 lb passen-

occupants and cargo should never exceed XXX

gers in your vehicle, the amount of available

pounds" on your vehicle’s placard (depending

cargo and luggage load capacity is 100 lbs.

on the date of manufacture).

(400 - 300 (2 x 150) = 100 lbs.).

2. Determine the combined weight of the driver

5. Determine the combined weight of luggage

and passengers that will be riding in your vehi-

and cargo being loaded on the vehicle. That

cle.

weight may not safely exceed the available car-

go and luggage load capacity calculated in

Step 4.

Example for determining the combined weight of

occupants and cargo

Vehicle Load Capacity

f The combined weight of occupants and cargo

should never exceed the weight shown on the

tire plate in the vehicle.

Please see the chapter “TIRE PRESSURE PLA-

TE” on Page 265.

f Never exceed the number of passengers

shown on the tire pressure plate in the vehicle.

Practical Tips, Emergency Service

225

f Always clean the wheel bolts before fitting.

Wheel Securing Bolts

f Apply a thin coat of Optimoly TA (aluminum

If the wheels have to be removed at the workshop,

paste) on the thread and between the bolt head

please do not forget to hand over the wrench

and movable spherical cap ring (arrows).

socket for the wheel securing bolts along with the

The bearing surface of the spherical cap

car key.

facing the wheel must not be greased.

The wrench socket for the wheel securing bolts is

f Replace damaged wheel bolts.

in the tool box.

Only use the Original Porsche wheel bolts spe-

cially designed for this vehicle type.

To loosen or tighten the wheel bolt with anti-theft

protection, a wrench socket with the appropriate

coding must be used between the wheel bolt and

Tightening torque

the wheel-bolt spanner.

Tightening torque of wheel bolts:

f When positioning the wrench socket, ensure

96 ftlb./130 Nm

that it engages fully in the teeth of the wheel

bolt.

Wheel Bolts

Danger!

Risk of wheel bolt breakage and wheel sepa-

ration, resulting in serious personal injury or

death.

f Follow all instructions concerning wheel bolts.

226 Practical Tips, Emergency Service

Slightly slacken the wheel bolts of the wheel to

Changing a wheel

be changed.

Warning!

Lift the car only at the specified jacking points.

Risk of serious personal injury or death. The

Raise the car until the wheel lifts off the

car may slip off the jack.

ground.

Please see the chapter “LIFTING THE VEHICLE

f Make sure that no one is in the vehicle when

WITH A LIFTING PLATFORM OR GARAGE LIFT”

jacking up and changing a wheel.

on Page 232.

f Always place the car on stable supports if work

Remove 1 or 2 wheel bolts (see respective

has to be carried out under the car.

illustration).

Risk of damage to the brake discs of the

Screw in assembly aids instead of the wheel

Porsche Ceramic Composite Brake (PCCB).

bolts.

f Always screw in both assembly aids when

changing a wheel.

Note

Screw in assembly aid for cars without Porsche Ceramic

The tools required for changing a wheel (e.g. jack,

Composite Brake

wheel bolt wrench, assembly aids) are not sup-

plied with the car.

9. Remove the remaining wheel bolts.

Your authorized Porsche dealer will be pleased to

advise you.

Note on operation

1. Apply the handbrake fully and engage 1st gear

f To remove or mount the spacers:

or PDK selector-lever position P and remove

Please see the chapter “SPACERS” on

the ignition key.

Page 233.

2. Switch on the hazard warning lights if neces-

sary.

3. Secure the car against rolling away, e.g. by

means of wedges under the wheels on the op-

posite side.

This is particularly important on slopes.

Practical Tips, Emergency Service

227

Please see the chapter “TIRE PRESSURE FOR

Checking tire pressure with a

COLD TIRES (68 °F/ 20 °C)” on Page 267.

pressure gage

14.Lower the car fully and remove the jack.

1. Remove the valve stem cap from the tire.

15.Tighten wheel bolts in diagonally opposite

sequence.

2. Press the pressure gage onto the valve stem.

f Immediately after changing a wheel, use

Note on operation

a torque wrench to check the prescribed

Do not press too hard or force the valve stem

tightening torque (96 ftlb./130 Nm).

sideways, or air will escape.

If the sound of air escaping from the tire is

Note on operation for vehicles with

heard, reposition the pressure gage.

Tire Pressure Monitoring

f On vehicles with Tire Pressure Monitoring, the

Read the tire pressure on the gage stem and

settings on the on-board computer must be

compare it to the permissble tire pressure.

updated after the wheel change.

This information can be found on the tire pres-

sure plate or in the chapter Technical Data.

f Please see the chapter “TIRE PRESSURE FOR

Please see the chapter “TIRE PRESSURE FOR

COLD TIRES (68 °F/ 20 °C)” on Page 267.

Screw in two assembly aids for cars with Porsche

Ceramic Composite Brake

Remove the pressure gage.

10.Take the wheel off and put a new wheel on.

Please see the chapter “TPM TIRE PRESSURE

MONITORING” on Page 151.

Please see the chapter “WHEEL BOLTS” on

Page 226.

11.Insert wheel bolts and tighten by hand.

12.Remove assembly aids, screw in remaining

wheel bolts.

Initially tighten bolts only slightly in diagonally

opposite sequence so that the wheel

is centred.

13.Inflate the tire if necessary.

228 Practical Tips, Emergency Service

Important note

Flat Tire

Sealing the tire with the tire repair kit is only

Warning!

an emergency repair. Even with the tire air-

Failure to follow these instructions may result

tight, it may be used only for short journeys

in serious personal injury to you or to by-

in an emergency.

standers.

The maximum permitted speed is 50 mph

(80 km/h).

f If you have a flat tire, move a safe distance off

the road. Turn the emergency flasher on and

f Do not use commercially available sealant or

use other warning devices to alert other motor-

tire inflating bottles.

ists. Set the parking brake.

Use only the tire sealant located in the luggage

compartment.

f Do not park your vehicle where it may contact

dry grass, brush or other flammable materials.

Warning!

The hot parts of the exhaust system could set

such materials on fire, thereby causing both

Risk of accident, resulting in serious

property damage and serious personal injury

personal injury or death.

or death.

f Have tires replaced by a specialist workshop

as soon as possible.

A tire sealant and compressor with pressure

tester are located in the luggage compartment.

f Avoid hard acceleration and high cornering

speeds.

f Please observe the safety and operating in-

structions on the special sealant bottle with a

special Porsche part number and on the com-

pressor - these are essential.

Practical Tips, Emergency Service

229

Porsche Cayman (2010 year). Manual - part 13