Pontiac Fiero 1988 Service Manual page 208

TIRES AND WHEELS 3E-5
W H E E L N U T TIGHTENING S E Q U E N C E
G 3 3 9 5 7 - 3 E A N
Fig. 8 5 Hole Wheel Nut Tightening Sequence
TIRE MOUNTING AND DISMOUNTING
Fig. 9
Use a tire changing machine to mount or
dismount tires. Follow the equipment manufacturer's
instructions. Do not use hand tools or tire irons to
change tires as they may damage the tires bead or
wheel rim.
Rim bead seats should be cleaned with a wire
brush or coarse steel wool to remove lubricants, old
rubber, and light rust. Before mounting or dismounting
a tire, the bead area should be well lubricated with an
approved tire lubricant.
After mounting, inflate until beads are seated, but
never exceed 275 kPa (40 psi) to seat the beads.
C A U T I O N : T o a v o i d s e r i o u s p e r s o n a l
i n j u r y , d o n o t s t a n d o v e r t i r e w h e n
i n f l a t i n g . B e a d m a y b r e a k w h e n b e a d
s n a p s o v e r s a f e t y h u m p . D o n o t
e x c e e d 2 7 5 k P a ( 4 0 p s i ) p r e s s u r e
w h e n i n f l a t i n g a n y t i r e if b e a d s a r e n o t
s e a t e d . If 2 7 5 k P a ( 4 0 p s i ) p r e s s u r e
w i l l n o t s e a t b e a d s , d e f l a t e ,
r e l u b r i c a t e t h e b e a d s a n d r e i n f l a t e .
O v e r i n f l a t i o n m a y c a u s e t h e b e a d t o
b r e a k a n d c a u s e s e r i o u s p e r s o n a l
i n j u r y .
Install valve core and inflate to proper pressure.
Check the locating ring of the tire to be sure it shows
Fig. 9 Tire Locating Ring
TIRE REPAIR
There are many different materials and
techniques on the market to repair tires. Tire
manufacturers have published detailed instructions on
how and when to repair their tires. These instructions
can be obtained from the tire manufacturer.
Due to the thin 3.2 mm (4/32") tread depth on
temporary spare tires, tire repair is not recommended.
WADDLE
Waddle is side-to-side movement at the front
and/or rear of the car. It can be caused by the steel belt
not being straight within the tire, or by excessive lateral
runout of the tire or wheel. Use a dial indicator on the
tire's sidewall and on the rim's flange to determine if
there is excessive lateral runout.
MEASURING WHEEL RUNOUT
Fig. 10
Wheel runout should be measured with an
accurate dial indicator. Measurements may be taken
with the wheel installed on the car or off the car using
an accurate mounting surface such as on a wheel
balancer. Measurements may also be taken with or
without the tire mounted on the wheel.
Radial runout and lateral runout should be
measured on both the inboard and outboard rim
flanges. With the dial indicator firmly in position,
slowly rotate the wheel one revolution and record the
total indicator reading. If any measurement exceeds
specifications, and there is a vibration that wheel
balancing will not correct, the wheel should be
replaced. Disregard any indicator readings due to
welds, paint runs, scratches, etc.
• STEEL WHEELS
Radial runout .040"
Lateral runout .045"
• ALUMINUM WHEELS
Radial runout .030"
Lateral runout .030"