Chevrolet 10 series 1973, Руководство по капитальному ремонту

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4 - 2 6 REAR AXLE D IFFERENTIA L CARRIER
or 10-15 inch pounds on reused bearings. Use an
inch-pound torque wrench such as J-5853, as shown
in figure 28B, to measure the rotating torque.
NOTE: After torque has been checked, final
tightening should be done very cautiously.
For example, if when checking, torque was
found to be 5 inch-pounds, additional
tightening of the pinion nut as little as 1/8
turn can add 5 additional inch pounds drag.
Therefore, the pinion nut should be further
tightened only a little at a time and torque
should be checked after each slight amount
of tightening. Exceeding torque specifications
may compress the collapsible spacer too far
and require its replacement.
10. Rotate the pinion several times to assure that
bearings have been seated. Check preload again. If
drag has been reduced, re-set preload to
specifications.
CHECKS AND AD JU STM EN TS
Four adjustments are essential for proper operation of
the differential and its related parts. These adjustments
are a) Pinion Bearing Preload, b) Side Bearing Preload,
c) Pinion Depth and d) Ring Gear-to-Pinion Backlash.
Pinion Bearing Preload is set to specifications in step 8
of "Drive Pinion-Installation and Adjustment".
Side Bearing Preload is set to specifications in step 9 of
"Differential Case-Installation and Adjustment".
Following service to the Differential Case or to the Drive
Pinion and Ring Gear, a Gear Tooth Contact Pattern
Check
must
be made to verify the accuracy of the work
in setting the pinion depth and the ring gear-to-pinion
backlash.
Gear Tooth Contact Pattern Check
Prior to final assembly of the differential, a Gear Tooth
Contact Pattern Check is necessary to verify the correct
relationship between ring gear and drive pinion. Gear
sets which are not positioned properly may be noisy, or
have short life, or both. With a pattern check, the most
desireable contact between ring gear and drive pinion
for low noise level and long life can be assured.
GEAR TOOTH NOMENCLATURE
The side of the ring gear tooth which curves outward, or
is convex, is referred to as the “drive” side. The concave
side is the “coast” side. The end of the tooth nearest
center of ring gear is referred to as the “toe” end. The
end of the tooth farthest away from center is the “heel”
end. Toe end of tooth is smaller than heel end. See
Figure 29B.
Test
1. Wipe oil out of carrier and carefully clean each
tooth of ring gear.
2. Use gear marking compound and apply this
mixture sparingly to all ring gear teeth using a
medium stiff brush. When properly used, the area
of pinion tooth contact will be visible when hand
load is applied.
3. Tighten bearing cap bolts to 55 lb. ft.
4. Expand brake shoes until a torque of 20-30 lb. ft. is
required to turn the pinion.
NOTE: A test made without loading the
gears will not give a satisfactory pattern.
Turn companion flange with wrench so that
ring gear rotates one full revolution then
reverse rotation so that ring gear rotates one
revolution in opposite direction. Excessive
turning of ring gear is not recommended.
5. Observe pattern on ring gear teeth and compare
with Figure 30B.
C O N V E X SIDE
(DRIVE)
C O N C A V E SIDE
(C OA ST)
Fig. 2 8 B —M easuring R otating Torque
Fig. 2 9 B —Gear Tooth N o m en cla tu re
OVERHAUL MANUAL