REAR AXLE AND REAR SUSPENSION 4 4 3 While firmly holding the pinion with a rag to form a friction brake turn the ring gear back and forth l with a wrench fig ll on the ring gear mounting S A nn bolts until a definite contact pattern is formed im S t g j 4 Ins ect the contact attern produced and analyze the Skt ef z it jr P P SSii e i Si S results relative to the following data Figure 12 S 4 provides gear tooth nomenclature and Figure 13 an 7 S i i li V V illustrates the various contact patterns which may S ygyy piggy be experienced C5 M V The large end of the tooth is called the heel and t iiii on the small end the toe Also the top of the tooth r which is the part above the pitch line is called the ig i A face while the part below the pitch line is called the f1e k The epeee be Wee eeieeem meehiee A z 1 5 teeth is referred to as backlash i g Figure 13 shows correct and incorrect contact Q patterns For illustrative purposes coast side not Y e yc of gear contact is shown Drive and coast side of t f jr f S jj gear teeth win have identical contact patterns i lt J A j Tooth pattern A is ideal for quietness and long life lf the pattern shows a toe contact B Fig Tieh e i e Pinien Beerine Adiustine Sleeve it indicates not enough backlash To correct move the ring gear away from the pinion by loosening torque from Our example the final total turning right hand differential adjusting nut and tightening torque measured at the pinion would be 12 14 in lbs lefbhand adlustmg nut with used bearings or 17 19 in lbs with new NOTE Make adjustment One notch at 3 time bearmgsj A b repeat check with red lead and continue adjust 7 Install pinion adjusting sleeve locking ta ment nnm moth Contact annears as in liA Backlash must remain within limits Ri 9 G d Pi i C P it the pattern shows a heel contact ec it indi Upon completion of the ring gear to pinion backlash Egg goo much backlash Make correfmon s ior j owever loosen left hand differential adjusting adjustment a check of the gear teeth contact pattern nut and tighten right hand adjusting nut to move ring should be made to ensure gear life and minimize bearing t d 1 h noise from the carrier gleart owar pinion Back as must remain within l Thoroughly clean the ring gear and pinion teeth with mu S solvent and air dry 2 Paint ring gear teeth only with a light and even coating of a mixture of iron oxide gear marking V compound of a suitable consistency to produce a n n nnn n contact pattern on the ring gear V o ie l i ie i e T Q V tlc ssitisi rir 1 fi t tts irti M to A S e c L i L w Wae i j K r T S pp Et i if eee SS j r rrn S SS e J xi JQ i e I ai A S lslti it SS e I Se 1 V t l S S S M S it S S S 4 r jeg V i Si Sw e S S 1 i S e f I 2 ji t V ii e t L eS j X n 1 a t s n r S SS S S n H p eSst See V SSi SS t e i P V xt U Q ij s Si ji 5 V V V i SV v SS QF 4 te J2 S it Fit e SSl iT e 72 SS Si i i VSV he Fig iO Me suring Pinion Turning Torque Fig DeV ping Cont qct Pqrrem CORVAIR SHOP MANUAL SUPPLEMENT