W Heel And Tire Balancing; Wheels - Chevrolet 10 Series 1970 Service Manual

CKP 10 SERIES
CDLST
>0 SERIES
In som e cases this fin is alm ost as pronounced as a to e -
in fin, and in others, it tap ers into a row o f tread blocks
to such an extent that the tir e has a d efin ite "step w e a r"
appearance.
Th e only rem edy fo r corn erin g w ea r-is p ro p er instru c­
tion of o p era to rs. D riv in g m ore slow ly on cu rves and
turns w ill avoid grinding rubber o ff tir e s .
m al corn erin g w ea r as much as p ossib le, tir e s should be
interchanged at reg u la r in te rv a ls .

W heel and Tire Balancing

It is d esira b le fro m the standpoints o f t ir e w ea r and
ve h icle handling ease to maintain p ro p e r balance of front
wheel and t ir e assem b lies on a ll m odels.
tended fo r use on fron t of v e h ic le , such as those switched
during p e rio d ic t ir e rotation and those installed as new
o r re p a ire d replacem ent equipment should be accu rately
balanced. T h is may be accom plished by eith er of the two
types o f balancing system s in current use which balance
w heels eith er on the v e h ic le o r o ff.
type, h ow ever, is the m ore d esira b le in that all ro llin g
components (brake drum s, b ea rin gs, s ea ls, etc.) a re in­
cluded in the balancing proced u re and thereby have any
existin g unbalance corre c te d .
Truck W h eel Balance W eights
A ll 1969 truck w heels equipped with a tubular side ring
(ro lle d flange rim ) on the outboard side of the wheel rim s
req u ire sp ecial design weights to fit.
can be accom plished through use o f these sp ecial balance
weights which are designed only fo r installations on the
outboard side of these w heels.
only the inboard side of these w heels.
Static Balance
Static balance (som etim es c a lled s till balance) is the
equal distribution of weight of the wheel and t ir e a ssem ­
bly about the axis of rotation in such a manner that the
assem b ly has no tendency to rotate by its e lf, re g a rd le s s
of its position. F o r exam ple:
d irt on the rim w ill always rotate by its e lf until the heavy
CKP 20 , C P 30 SERIES C P 30 W /D U A L REAR
F ig . 3 — Rear W heels and A tta c h m e n ts
T o offset n o r­
A ll w heels in ­
T h e "on the v e h ic le "
Dynam ic balancing
Conventional w eights fit
A wheel with a chunk of
....
j
50, 60 SERIES
side is at the bottom.
this is sta tica lly out of balance.
wheel causes a hopping o r pounding action (up and down)
which frequ en tly leads to wheel "flu tte r " and quite often
to wheel "tra m p ".
Dynam ic Balance
Dynamic balance
means that the wheel must be in static balance, and also
run sm oothly at a ll speeds.
T o insure successful, accurate balancing, the fo llo w in g
precautions must be observed:
• W heel and t ir e must be clean and fr e e fro m a ll fo re ig n
m atter.
• Th e tir e s should be in good condition and p ro p e rly
mounted with the balance m ark on the t ir e , if any, lined
up with the v a lve.
• Bent w heels that have runout o v e r 1/16" on 1/2, 3/4
and 1 ton, o r 1/8" on 1-1/2 and 2 ton trucks should
eith er be replaced o r straightened b efore being b a l­
anced.
• Inspect t ir e and w heel assem bly to determ in e if an
eccen tric o r ou t-of-rou n d condition e x ists.
this condition, i f s e v e r e , cannot be "balanced ou t".
assem bly which has an out-of-round condition e x ceed ­
ing 3/16" on t ir e
s iz e s la r g e r than 19.5", is not suitable fo r use on the
fron t of the v eh ic le.
governed by its
roundness d efect serio u sly detracts fro m o v e ra ll rid e
quality.
• When balancing w heels and t ir e s , it is recom m ended
that the instructions co v e rin g the operation o f the wheel
balan cer being used be c lo s e ly follow ed .

WHEELS

Two-Piece Wheels
It is p o ssib le to m ix d iffe r e n t-s iz e wheel d iscs and
WHEELS AND TIRES 10-9
40, 50 SERIES
60 SERIES
Any wheel with a heavy side lik e
Static unbalance of a
(som etim es ca lled running balance)
s iz e s through 19.5" and 3/16" on
Its use on the r e a r should be
gen eral condition and whether the
CHEVROLET TRUCK SERVICE MANUAL
N ote that
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