PS Magazine - TB 43-PS-436
PS, The Preventative Maintenance Monthly
ISSUE 436
MARCH 1989
Commercial Tires .±±
mmercial-desIgn t±res show up on
a number of vehicles, including the
CUCV. You have to take care of them
to get the Most lIF out of them.
Look at your tires during your daIly
be²re-operat³ons P´CS. Check ²r
cuts, cracks or gouges that extend to
the cord bodyµ ¶ook ²r bulges or aNy
dAmAge. Remove any nails or anything
else that penetrates the tires.
Tire Pressure
·n underinflated or overloaded tire
Is headed ²r an early graveyard. Either
way, the tIre ¸exes more and makes
heat. HeAt is a tIre's worst enemy, and
leads to early ¹aºlure.
Use a tIre pressure gage to check the
pressure as part of your WEEKL»
P´CS¼ ½f ¾ou see a tIre that looks low,
check the pressure¼ Your Mechanic has
a gage you can use, and your
-10
T´
lIsts t¿e pressure ²r the tires.
Check tIre pressure be²re Àou start
out, whiÁe the tire is sÂIll cold. WhIle
¾ou drÃve, the tIre heats uÄ, and the
8
pressure goes up, so donÅt check the
pressure ÆIght after a trip.
Defects to Look For
. BUll±Og ²hROa²-A
single woÇ
spot on the tread. Check It close .µ. ºt
could be a bubble under the tread!
Tread separations liÈe thºs can blow
out on the Æoad. Have the tºre Æeplaced
Immediately¼
MAR 89
-
l
³
B
U
ÉÉ
lE
ÊËUnder the tread or ºn
sidewall. These are a separation or aIr
Äocket between layers of the tIre. ReÌ
place the tiÆe ÍSÍPÎ The tIre could
blow at any time. Ïut donÐt be ²oled
by rIpples In the sidewall of Æadial tires¼
These aÆe caused by the way the tºre is
made.
4´ µnEvEn ²REad
w
EaR
ËTread ºn
the center woÇ down MoÆe than the
outsºde ºs a sºgn of runnºng the tºre
overin¸ated.
ËTread woÇ down more on both
edges More thaÑ tÒe ceÑter MeaÑs the
tiÆe ran underºÑÓated.
Ô
TÕeaD woÇ ÖowÑ ×oÆØ oÑ one
sºde oÆ the other ºs a tºp-oÙ that the
ÚoÑt end alºgÑÛent is OÜ.
MAR 8²
³
ËTread feathering, where the back
edge of individual tread blocks are
woÝ down more than the Úont edgeÞ
ThIs ºs an indºcatIon of alignment probß
lems or bad shocks, ball joints or a
woÝ suspension system.
Small cracks or "checkingà ºn the
sidewall are the result of tºre aging. Ís
long as the cracks do not penetrate to
the cords, you donÐt Ñeed to replace
the tIÆe. Keep an eye oÑ the tÃre to see
if the cracks get deeper.
f you have any questºons on whether
a tire is bad, get your Mechanºc to
cáeck it.
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