Are you stressing to owners the importance of regularly checking tire pressures and keep- ing all tires inflated to 35 pounds?
Recently a representative of one of the tire companies checked the inflation pressures on more than 400 tires on Ford owners’ cars and found pressures varying all the way from 13 to 55 pounds.
Does this condition exist among your customers?
Tires must be properly mounted
Here are two examples of incorrect tire mounting. Fig. 620 shows what happens to an inner tube when a tire is inflated before it is properly centered on the rim.
In this case after mounting the tire, the mechanic failed to work the casing back and forth until the beads on the tire were seated on the rim bead seats, indicated by the red line on the casing showing an even distance from the rim all around on both sides. The result was that the tube was inflated while the beads on the tire were still in the rim well and as the air pressure was applied the tube attempted to push the tire out of the well with the result the tube was pinched beneath the bead, causing it to take a permanent set as shown in Fig. 620. This condition can be eliminated by first applying one or two pounds of air or just enough to. round out the tube, then shaking the casing to make sure it is raised out of the well, then inflating to recommended pressure.
Fig. 621 shows the result of carelessly mounting a tire on the rim with the valve stem cocked to one side instead of extending straight out from the tube.
When a tire is inflated with the valve stem cocked to one side, the bridge washer at the bottom of the valve stem cuts into the tube (see Fig. 621) and as the pressure increases, while the tire is being inflated, the washer either cuts through the tube or badly weakens it.
All tires used as original equipment on the Model ” A ” have a soft gum feather edge placed on the casing bead. Under no circumstances must this soft edge be removed. If it is removed chafing of the tube will result.