Chevrolet 70 1969 Series, Shop Manual

Page: 872 / 913

TRANSMISSION AND CLUTCH 7-126
INSPECTION A N D REPAIR
Prior to inspection, wash all parts in cleaning solvent
except driven disc assemblies. W ipe off the driven disc
assemblies. Inspect all clutch com ponents and the flywheel
and pilot bearing assemblies.
FLYWHEEL
Refer to E N G IN E (SE C . 6) for flywheel inspection, re­
moval, overhaul, and installation.
PILOT BEARING
1. Rem ove pilot bearing as follows:
a. Adjust puller (J-5901-2) with thum b screw, until
fingers on puller are closed.
b. Insert puller through bearing inner race as far as
it will go, then tighten thum b screw to spread
puller fingers behind bearing.
c. T hread shaft of slide ham m er (J-2619-B) into
puller. Slide weight sharply against stop nut on
slide ham m er to remove the bearing.
2. After removal, inspect pilot bearing for corrosion or
rough spots on either the balls or the races. This may
be done by holding the inner race to prevent turning,
then revolving the outer race slowly by hand. A few
revolutions in this m anner will show any rough spots
Tr'll?rn'i
Pre ssu re Plate
G a u g e Pin
M ic ro m e te r
F ig u re 7 — C h e c k in g P re ssu re P late a n d In t e rm e d ia te Plate for
W a r p a g e
F ig u re 8 — M e a s u r i n g P re ssu re P late T h ic k n e ss
on either balls or races. If bearing does not turn free­
ly, or is excessively loose, if m ust be replaced.
3. Install bearing as follows:
a. Pack clutch pilot bearing with a sm all quantity
of high tem perature lubricant specified in L U ­
B R IC A T IO N (SEC.
0).
b. W ith shielded side of bearing facing out (fig. 1),
drive pilot bearing into position using a suitable
driver. Bearing should be seated firmly in flywheel
assembly.
PRESSURE PLATE
1. The pressure plate m ust be replaced if:
a. Friction surface is severely heat checked or scored.
b. If it is w arped in excess of
0.015”
(fig. 7).
NOTE: A heat checked, scored, or warped pres­
sure plate will cause the disc to disintegrate.
c. Driving lug slots are worn.
d. Pin holes are elongated.
2. The pressure plate may be salvaged if the friction sur­
face cleans up by removing a m ax im um of 1 / 32-inch
of m etal by machining. M easure pressure plate thick­
ness at lever pins as shown in Figure 8. Original
thickness is listed in “ Specifications” at end of this
section. W hen refinishing, care m ust be used to m ain­
tain a friction surface parallel to the pressure plate
pins.
INTERMEDIATE DRIVE PLATE
1. The interm ediate plate m ust be replaced if:
a. Friction surface is severely heat checked or scored.
b. If it is w arped in excess of
0.15”
(fig. 7).
NOTE: A heat checked, scored, or warped int­
ermediate plate will cause the disc to disinteg­
rate quickly.
2. The interm ediate plate m ay be salvaged if the friction
surfaces can be cleaned up by m achining with removal
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK S H O P M A N U A L