NOTE If large size balance weights have been 111 used to balance the wheel and tire assembly their removal is necessary to be able to re move the accessory trim ring Reinstall weights in same locations Place the jack directly under the side edge o body approximately 10 toward center of vehicl from forward edge of rear fender opening or 4 back of front seam of sill fig 3 36 and raise ca until wheel clears ground STOWAGE BOLTS 4 INCHES 10 INCHES FRONT SEAM rAD Fig 3 36 Jacking Vehicle Remove wheel mounting nuts and remove whee from hub or drum To replace road wheel reverse the above instruc tions Proper torque on nuts is 45 65 ft lbs Ii ITERCHANGING TIRES Normal tire wear is uneveri between the front an r ar wheels because of the difference in the function c the front and rear tires To minimize tire wear an t e noise it is recommended that tires be inter c anged both as to front or rear use and as to chang c direction at intervals of from 4 000 to 5 000 mile In addition utilizing the spare tire in rotation wit t e other four tires gives 20 more total car mileag 1 rfore replacement tires must be purchased SERVICE C ORRECTION OF IRREGULAR TIRE WEAR 1 eel and Toe Wear This is a saw toothed effect where one end of ead t ead block is worn more than the other The end that wears is the one that first grips th ifad when the brakes are applied Heel and toe wear is less noticeable on rear tire t tan on front tires because the propelling action c The recommended plan for interchanging tires is based on the following steps Move the left front wheel to right rear right rear to right front right front to left rear left rear to spare and spare to left front f In detail the plan provides the changes as shown in Figure 3 37 each time the tires are interchanged C 0 REAR FRONT 5 0 0 RR RF Fig 3 37 Tire Rotation Plan If the spare tire is not used criss cross the tires to obtain balanced tire wear left front to right rear etc NOTE Be certain to readjust tire pressures 1 after rotating or criss crossing CLEANING WHITEWALL TIRES A great deal of ordinary road dirt which collects on white sidewall tires may be sponged off with clear water or a mild soap solution Chevrolet Whitewall Tire Cleaner however is a quicker and more effective cleaner for removing dirt and stains from whitewall tires and in many cases it will remove stains and discoloration that the simpler method of soap and water will not remove Under no circumstances should gasoline kerosene or any cleaning fluid containing a solvent derived i from oil be used to clean whitewall tires Oil in any form is detrimental to rubber and a cleaner with an oil base will discolor or injure whitewall tires OPERATIONS the rear wheels creates a force which tends to wear the opposite end of the tread blocks The two forces propelling and braking make for more even wear of i the rear tires whereas only the braking forces act on the front wheels and the saw tooth effect is more noticeable A certain amount of heel and toe wear is normal s Excessive wear is usually due to high speed driving f and excessive use of brakes The best remedy in CORVAIR SHOP MANUAL