Specifications - Chevrolet 40 SERIES 1971 Service Manual

p e a ra n c e of tr e a d w e a r a s tir e w e a r c au sed by
n eg ative c a m b e r.
Second, the tr a n s f e r of w eight m ay a lso o v e r ­
lo ad the o u tsid e t i r e s so m uch th at they a r e l a t e r ­
a lly d isto rte d re s u ltin g in e x c e ssiv e w e a r on the
o u tsid e half of the t i r e , p roducing a type of w ear
lik e th a t cau sed by e x c e ssiv e p o sitiv e c a m b e r.
C o rn e rin g w e a r can be m ost e a sily d istin g u ish ­
ed fro m ab n o rm al c a m b e r w e a r by th e rounding of
th e o u tsid e sh o u ld e r o r edge of the t i r e and by the
roughening of the tr e a d su rfa c e which denotes
a b ra s io n .
CAST TY PE WHEELS
T ighten n u ts a s d ire c te d in tex t to:
F r o n t .....................................................................................................190-210 foot-pounds
R e a r
BUDD TY PE (DISC) WHEELS
T ighten nuts a s d ire c te d in tex t to:
F r o n t ....................................................................................................
R e a r (Inner and O u te r N u t s ) ........................................................
A lum inum W heels a n d /o r Hubs
CORPORATION TY PE (DISC) WHEELS
T ighten nuts a s d ire c te d in tex t to:
F r o n t ..................................................................................................... 300-400 foot-pounds
R e a r .....................................................................................................
* L o osen o u te r n u ts, tighten in n e r n u ts, then tighten o u te r nu ts.
A ll w heels equipped w ith a tu b u la r sid e rin g (ro lle d flange rim ) on
th e ou tb oard sid e of the w heel r im s i e q u ire sp e c ia l design w eights to fit.
D ynam ic balancin g can be ac co m p lish ed throu gh u se of th e se sp ecial
b a lan ce w eights w hich a r e designed only fo r in sta lla tio n s on the out­
b o a rd sid e of th e se w heels. C onventional w eights fit only th e inb oard
sid e of th e se w heels.
CAUTION: DO NOT stand unprotected in front of clamp ring when
Inflating tire. If a protective inflation cage is not available, wrap three
lengths of chain, evenly spaced arcund tire and rim. Secure chains but
leave loose enough to permit expansion of tire during inflation. Use an
extension gauge with clip on chucJc so air pressure build-up can be
closely watched and so that you can stand well back from the assembly
during the bead seating process to avoid possibility of personal injury.

SPECIFICATIONS

WHEEL NUT TORQUE
.....................................................................................................190-210 foot-pounds
.................................................
II
C o rn erin g w e a r often p ro d u ces a fin o r ra is e d
p o rtio n along the in sid e edge of each row in the
tr e a d p a tte rn . In so m e c a se s th is fin is a lm o st a s
p ronounced a s a to e -in fin, and in o th e rs , it ta p e rs
into a row of tr e a d b lo cks to such an extent th at
the t ir e h as a definite "step w e a r" a p p e a ra n c e .
The only rem ed y fo r co rn e rin g w ear is p ro p e r
in stru c tio n of o p e r a to r s . D riving m ore slow ly on
c u rv e s and tu rn s w ill avoid grinding ru b b e r off
t i r e s . To o ffse t n o rm a l c o rn e rin g w e ar a s m uch a s
p o ssib le , t ir e s should be in terch an g ed a t re g u la r
in te r v a ls .
500-550 foot-pounds
500-550 foot-pounds*
450-500 foot-pounds*
300-400 foot-pounds
Sec. 10-11
WHEELS AND TIRES
CHEVROLET 40-60 TRUCK SERVICE MANUAL