Chevrolet 70 1969 Series, Shop Manual

Page: 866 / 913

TRANSMISSION AND CLUTCH 7-120
>Mn
Thrust Plate
C O V E R A N D PR ESSU RE PLA TE A S S E M B L Y IN A R B O R PRESS
F ig u re 2 — D is a s s e m b lin g C o v e r a n d P re ssu re Plate
2. Place cover and pressure plate assembly on arbor
press bed with pressure plate resting on spacers 3 /8 ”
thick. Place a bar across cover, clearing all thrust
plate bolts and yoke adjusting nuts (fig. 2). Turn
arbor press screw down against bar and force cover
down against press bed, compressing the pressure
springs.
3. Remove two cap screws attaching each thrust plate
(13) to clutch cover. Remove adjusting nut (II ) from
each release lever voke (12). Remove thrust plates
(13).
4. Slowly release arbor press until pressure of springs is
relieved. Rem ove clutch cover (14) from pressure
plate (6). Rem ove sixteen coil pressure springs (21)
from pressure plate. Remove pressure plate and re­
lease lever assembly from arbor press bed and place
on bench.
5. It is not necessary to remove yokes (12) from levers
(7) or to remove levers from the pressure plate unless
necessary to replace parts as indicated later under
“ Inspection and R epair.”
INSPECTION A N D REPAIR
Prior to inspection, wash all parts in cleaning solvent
except driven disc assembly. W ipe off the driven disc as­
sembly. Inspect all clutch com ponents and also the fly­
wheel and pilot bearing assemblies.
FLYWHEEL
Refer to E N G IN E (SEC. 6) for flywheel inspection, re­
moval, overhaul, and installation.
Clutch C o v e r
N' v ^
Pressure A
Plate Lug
Feeler G a u g
3 / 8 " Sp a ce rs
F ig u re 3 — C h e c k in g - L u g - t o - C o v e r C le a ra n c e
PRESSURE PLATE
1. The pressure plate m ust be replaced if:
a. Friction surface is severely heat checked or scored.
b. It it is w arped in excess of 0.015”
NOTE: A heat checked, scored, or warped pres­
sure plate will cause the disc facing to disinteg­
rate quickly.
c. Driving lug slots are worn.
d. Pin holes are elongated
2. The pressure plate m ay be salvaged if the friction sur­
face cleans up by removing a m axim um of 1 / 16-inch
of metal by m achining.
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK S H O P M A N U A L