Porsche 928 S4 – Owner’s Manual

 

Model Year

1987

 

 

 

 

 

 

 

 

Contents

 

 

 

 

 

 

 

 

 

 

 

From the “Porsche 928 S4 Owner’s Manual”, available from 928 Specialists.

 

928 S4 page

 

John Pirtle

 

 

 

 

 

 

 

 

Collapsible spare tire

 

The spare tire is stored underneath the luggage compartment cover.  It is covered by a lid with a quick release catch.  The car jack, the electric air compressor kit and the tire pressure tester are stored inside the wheel rim.  This kit also includes a plastic cover for the road wheel to keep luggage compartment or car interior clean.

 

Due to tread and space save design features of the collapsible tire, car handling may be affected.

 

Therefore, do not drive more than 50 mph/80 km/h with moderate acceleration when using the collapsible spare tire.  It is for emergency use and short distances only.  Fitting the spare wheel at the front improves handling of the car and reduces wear on the tires.  This applies for cars equipped with locking differential, in particular.  Only one collapsible spare tire may be fitted to the car.  Remount the original road tire as soon as possible.

 


Inflating the collapsible tire

 

WARNING

Do not overinflate your spare tire.

 

Inflate the collapsible tire with the electric air compressor that comes with your Porsche.  Do not use other equipment!

 

  1. Mount spare wheel before inflating the tire.

 

  1. Attach hose of air compressor to tire valve and insert plug of electric cord into cigarette lighter socket.

 

  1. The required tire pressure is 36 psi or 2.5 bar.  Check pressure with tire pressure gauge.

 

  1. Disconnect hose and electric cord and store air compressor.

 

  1. Have flat road tire repaired and remounted on car at next service stop.  Remember, the collapsible tire is for emergency use and short distances only.

 

When the air is released from the collapsible tire, it will return to its original shape after cooling down for several hours.  Store collapsible tire in the luggage compartment.

 

The collapsible spare tire cannot be repaired or mounted with standard workshop equipment.  Repair and remounting must only be done by the tire manufacturer.

 

 

Tire tread depth

 

As required by law, the tread depth of the collapsible tire is the same as that of the original equipment tire.  Replace a worn collapsible spare tire in time.

 

 

If air compressor does not work

 

. . . Check if tobacco or any other foreign matter is lodged in the cigarette lighter socket.  Remove carefully with a wooden pick.  Do not use metal object to prevent short circuit.

 

. . . Check if fuse is blown.  Replace with new equivalent fuse.

 

 

Maintenance of air compressor

 

The air compressor is maintenance-free.  Do not apply oil or any other lubricant.

 

The air filter should be cleaned periodically to assure maximum efficiency of the unit.

 

 

 

 

 

Lockable wheel nuts

 

You can guard against wheel theft by installing lockable wheel nuts on your wheels.  Each kit contains three keys and four wheel nuts with lock sleeve.  The locking mechanism is identical for all four wheel nuts.  When taking the vehicle to your Porsche dealer or to a workshop for wheel or tire service, remember to leave one key with the service attendant.

 

In case of loss, duplicate keys cannot be furnished by your Porsche dealer.  Do not leave these keys in the vehicle.  Keep them in a safe place.

 

 

To unlock a wheel

 

1.       Remove protective plastic cap from wheel nut.

2.       Insert key all the way and turn left about 30°.

3.       Remove lock sleeve together with inserted key.

4.       Replace protective plastic cup.

 

Generally, it is not necessary to balance the wheels after installing lockable wheel nuts.

 

 

To lock a wheel

 

  1. Remove protective plastic cap from wheel nut.
  2. Insert key, turn it back 30° to right and remove.  Slide lock sleeve over wheel nut until you feel it lock in.
  3. Make sure that the edge of the lock sleeve rests firmly against base of wheel nut.
  4. Replace protective plastic cap.

 

 

 

 

 

Changing a wheel

 

WARNING – Failure to follow these instructions may result in serious personal injuries to you or to bystanders.

  • If you have a flat tire, move a safe distance off the road.  Turn the emergency flasher on and use other warning devices to alert other motorists.

 

  • Passengers must not remain in the vehicle when it is jacked up.

 

  • Before you change a wheel, be sure the ground is level and firm.  If necessary, use a board under the jack to ensure that the jack does not sink into the ground.

 

  • Set the parking brake and block the wheels opposite the flat tire on the other side of the vehicle.

 

  • The jack is only to be used for changing a wheel.  Do not use it as a support to work under the car.

 

  • Never jack the car up by the body or the bumpers.

 

 

Sequence of operation

 

  1. Loosen the wheel nuts about one turn.  Do not yet remove the nuts.

 

  1. Securely insert the car jack in the front jackport located under the body.  There are two on each side; front and rear.

 

Do not raise the vehicle until you are sure the jack is securely engaged.

 

  1. To raise the car, turn the handle clockwise.  Only raise the car as much as is needed to change the wheel.

 

  1. Fully unscrew all wheel nuts, remove the wheel and put the collapsible tire on.

 

  1. When the spare wheel is in position, reinstall the nuts and handtighten them crosswise.  When tightened crosswise, the nuts will center the wheel correctly.

 

  1. Inflate the collapsible spare tire with the air compressor.  Check pressure with tire pressure gauge.

 

  1. To lower the car, turn the jack handle counterclockwise until tire touches ground.

 

  1. Fully lower the vehicle and remove jack.

 

  1. Firmly tighten the wheel nuts again in a crosswise pattern.

 

 

Correct tightness of the wheel nuts is important.  Correctly tightened nuts should have a torque of 94 ft. lb. (130 Nm).  This torque can be obtained with the wheel nut wrench by any person of average strength.  If in doubt about the correct tightness of wheel nuts, have it checked with a torque wrench by your dealer or at a service station.

 

 

 

 

 

Lifting vehicle

 

Lifting with car jack

 

The jack ports are located below the front and the rear of the doors underneath the floor pan, hidden from view.

 

WARNING

  • Follow all warnings and instructions found in this manual for changing a tire.
  • The car jack must never be used as a support to work underneath the vehicle.  If the jack is accidentally dislodged, you or bystanders could be seriously injured.  When working under the vehicle always use safety stands specifically designed for this purpose.
  • Jacking at any other place may damage the vehicle or may result in personal injuries.

 

The vehicle should never be lifted or jacked up from underneath the engine oil pan, the transmission housing, or the front or rear axle.  This could lead to serious damage.

 

 

Lifting with workshop hoist

 

Make sure there is sufficient clearance between pads and vehicle before driving vehicle onto hoist, especially it the vehicle has a large front panel or spoiler.  The vehicle must be lifted only at the lift points illustrated.

 

The front lift points for the car jack also apply when using a hoist.

 

The rear lift points are located on the rear axle control arm mount.

 

Take care to avoid damaging critical components which are close to the lift points.

 

WARNING

When removing components such as engine block, transmission housing, fuel tank, wheels, front or rear axle, anchor vehicle to hoist or add corresponding weights to maintain the center of gravity.  Otherwise the vehicle might tilt or slip off the hoist causing serious damage or personal injury.

 

 

Lifting with floor jack

 

The same lift points as illustrated for the hoist also apply when using a floor jack.  To avoid damage to the underbody or chassis frame, it is necessary to insert a rubber pad between the floor jack and the lift points.

 

 

 

 

 

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