Tire Mounting For Critical Wheels/Tire Pairs
Tyre Mounting For Critical Wheels/Tyre Pairs
NOTE: The mounting machine described here is particularly suitable for difficult tyre constellations. All parts in contact with the wheel and the tyres are made of plastic. No large point load for wheel and tyres.
Tools
Notes on Removing/Mounting Tyres
- Use "TIP TOP Universal" tyre paste, order No. 593 0601 or "Contifix" for fitting.
- Ensure that no damage (scoring, soiling) is caused to the assembly head of the fitting machine during fitting. Such damage may result in paint damage and pressure marks on the rim flange.
- Avoid slipping on the rim flange. Use rim flange protection (assembly aid B).
- Adhesive tape can be used to protect the rim flange in individual cases, in order to prevent any paint damage during fitting. The mounting lever can also be covered with adhesive tape in order to avoid damaging the area around the spokes during removal.
- The rubber valves must always be replaced.
- Steel valves - for 18 inch Turbo wheels - do not usually need to be replaced when a tyre change is necessary. The steel valves should, however, be replaced after every second tyre change or after 3 years at the latest.
- Check the wheel for damage.
- Observe the running direction or the inside and outside of the tyre.
Removal
1. Clamp wheel.
2. When pushing off the tyre, ensure that the bead press-off tool is set to the exact inch graduation. If this is not the case, the rim flange may be damaged by the press-off rollers.
3. The wheel must be turned anticlockwise when pressing the tyre off the rim. Otherwise, excessive forces occur on the fastening bolts of the machine which can lead to bolt breakage.
The tyre beads can be pressed off at the same time or individually.
4. Before removing the tyre, coat the tyre bead with mounting paste to facilitate removal.
5. Put the assembly head on the rim flange. Position the assembly aid. The mounting lever is pushed into the deep bed underneath the first tyre bead, and then guided over the assembly shoe and pushed down.
NOTE: The mounting lever must be kept at a safe distance from the rim. This prevents damage (scratches, pressure marks) to the rim spokes.
6. Lift the tyre bead out of the rim bed by turning the wheel to the right.
7. Position the assembly aid for the second tyre bead. Pull the tyre upwards and push it into the rim bed underneath the second tyre bead using the mounting lever.
Make sure that the mounting lever is guided correctly (see Point 5).
Turn the wheel to the right and remove the tyre.
Fitting
1. Free the wheel from the abraded rubber particles and check for damage.
2. A new rubber valve must always be fitted. For wheels with steel valves (Turbo wheels), the valves can be reused if they are not damaged. The valves should, however, be replaced after every second tyre change or after 3 years at the latest.
NOTE: Do not use commercially available steel valves. The Porsche valves are shorter (dimension X, Figure 460_99). The Porsche version measures 43 mm.
3. Coat the wheel and tyre with tyre mounting paste - TIP TOP Universal, order No. 593 0601 or Contifix.
4. Place the tyre in the correct position on the wheel.
Push in mounting arm and position on top of the rim flange.
5. Guide the tyre bead through the assembly head. Fit the tyre bead in the deep bed by turning the wheel to the right.
6. At the start of the mounting process of the second tyre bead, the mounting arm should be positioned opposite to the valve. This prevents damage to the valve.
7. Press the second tyre bead onto the wheel as flat as possible and guide through the assembly head.
8. Insert first holding-down device and position the second holding-down device offset by 90° - 120°. Fit tyre bead in deep bed by turning to the right.
9. Fill tyre with compressed air.
At approx. 4.0 bar the beads should pop over the hump. Coat the tyre beads with mounting paste again if necessary so that they can pop over easily and gently.