Chevrolet 1977 light duty truck Service Manual page 364

DIFFERENTIAL A N D
C R A C K E D I N N E R RACE
R ACE C R A C K E D D U E TO IM P R O PER F IT ,
C O C K IN G , OR POOR B E A R IN G SEA TS.
R EPLA C E B E A R IN G A N D C O R R E C T B E A R IN G
S EATS.
F R E T T A G E
C O R R O S IO N SET UP BY S M A L L R E L A T IV E
M O V E M E N T O F PA R TS W IT H NO L U B R IC A T IO N .
REPLACE B E A R IN G . C L E A N R E L A T E D PARTS.
C H EC K S EA LS A N D C H E C K F O R PR O P ER L U B R IC A T IO N .
SMEARS
S M E A R IN G O F M E T A L D U E T O SLIP P A G E .
SLIPPAG E C A N BE C A U S E D BY POOR F IT S .
L U B R IC A T IO N , O V E R H E A T IN G . O V E R L O A D S
O R H A N D L IN G D A M A G E .
R EPLA CE B E A R IN G S , C L E A N R E L A T E D PA RTS
A N D C H ECK FO R PRO PER F IT S A N D
L U B R IC A T IO N .
REAR AXLE BEARING DIAGNOSIS
(C O N T 'D)
F A T I G U E S P A L L I
F L A K IN G OF S U R F A C E M E T A L R E S U L T IN G FRO M
F A T IG U E .
REPLA CE B E A R IN G C L E A N A L L R E L A T E D PA R TS.
S T A I N D I S C O L O R A T I O N
D IS C O L O R A T IO N C A N R A N G E FR O M L IG H T BROW N
TO B LACK C A U S E D B Y IN C O R R E C T L U B R IC A N T OR
M O IS T U R E .
RE-USE B E A R IN G S IF S T A IN S CA N BE R E M O V E D BY
L IG H T P O L IS H IN G O R IF N O E V ID E N C E O F O V E R
H E A T IN G IS O B S E R V E D .
C H ECK S E A LS A N D R E L A T E D PA R TS FOR D A M A G E .
G
B R I N E L L I N G
S U R F A C E IN D E N T A T IO N S IN R A C E W A Y C A U S E D BY
R O LL E R S E IT H E R U N D E R IM P A C T L O A D IN G OR
V IB R A T IO N W H IL E TH E B E A R IN G IS N O T R O T A T IN G .
REPLAC E B E A R IN G IF R O U G H OR N O IS Y .
HEAT D I S C O L O R A T I O N
H E A T D IS C O L O R A T IO N C A N R A N G E FR O M F A IN T
Y E L L O W TO D A R K B LU E R E S U L T IN G FRO M O V E R
LO A D (W A G O N 'S ) OR IN C O R R E C T L U B R IC A N T .
E X C ESSIVE H E A T C A N CAUSE S O F T E N IN G OF RACES
OR R O LLE R S .
T O CH ECK FO R LOSS O F TE M P E R O N RACES OR
R O LLE R S A SIM PLE F IL E T E S T M A Y BE M A D E . A
F IL E D R A W N O V E R A TE M P E R E D P A R T W IL L G R A B
A N D C U T M E T A L , W H E R E A S , A F IL E D R A W N O V E R A
H A R D P A R T W IL L G L ID E R E A D IL Y W IT H NO M E T A L
C U T T IN G .
REPLA CE B E A R IN G S IF O V E R H E A T IN G D A M A G E IS
IN D IC A T E D . CHECK SEA LS A N D O T H E R PAR TS.