Chevrolet 70 1969 Series, Shop Manual

Page: 867 / 913

TRANSMISSION AND CLUTCH 7-121
COVER
1. Inspect clutch cover for distortion or cracks. Clutch
cover flange should be flat within 0.015” when
checked on a surface plate.
2. Place cover over pressure plate and check clearnace
between driving lugs on pressure plate and edge of
slots in cover (fig. 3). C learance should not be less
than 0.008” or m ore than 0.015” .
DRIVEN DISC
For inspection and repair, refer to “ L IP E -R O L L W A Y
C L U T C H (13- A N D 14-IN C H )” section later in this
group.
RELEASE LEVERS
C heck ends of release levers which contact release bear­
ing support for wear. If excessive wear is evident, or if ne­
cessary to remove levers and yokes as indicated in Step 1
under “ Pressure P late,” remove as follows:
1. G rind off swaged end of pins securing release levers in
pressure plate lugs and remove pins. Rem ove release
levers and needle bearing rollers from pressure plate.
R e m o e pins securing yokes on release levers in sam e
m anner.
2. Inspect needle bearing bores in release levers for wear
or dam age. Replace levers or bearing rollers if d a m ­
age is evident.
3. A pilot pin 5 /1 6 ” in diam eter and 13/32” long is re­
quired for installing release levers and yokes. C ham fer
both ends of pin. Lay one release lever on side on
bench and place pilot pin in release lever yoke hole.
C oat needle bearing rollers with Lubriplate N o. 320
or equivalent, then insert rollers in lever around pilot
pin (fig. 4). Position release lever yoke over release
lever, then insert new pin through yoke and bearings
in lever, pushing out pilot pin (fig. 4). Use a chisel to
spread end of pin to secure in place (fig. 4); do not
spread pin far enough to bend or distort the yoke.
4. Install release lever in lugs on pressure plate, using
pilot pin in sam e m anner. Assem ble and install the
other release levers and yokes in sam e m anner.
PRESSURE SPRINGS
Check tension of each pressure spring under load listed
in “ Specifications” at end of this section. If m ore than 7
percent under the low limit on load, replace with new
spring.
RELEASE FORK AND BALL STUD
Check release fork and ball stud for wear or dam age
and replace with new parts as necessary. M ake sure re­
tainer spring in release fork is in good condition and will
hold fork in place on ball stud.
RELEASE YOKE AND SHAFTS (If Used)
Refer to “ L IP E -R O L L W A Y C L U T C H 13- and 14-
IN C H D U A L D IS C ” section later in this group for re­
placem ent of clutch release m echanism .
Release
Lever Pin
Pilot Pin
7
IN S T A L L IN G RELEA SE LEVER
Pilot Pin
/
V -
Release Lever
N e e d le B e a rin g s
Rollers
PILO T P IN A N D N EE D LE B E A R IN G RO LLERS IN S T A LL E D
Chisel
Release
Lever Pin
V i ?
/■
W i
j / Y o k e Pin
S P R E A D IN G R ELEA SE LEVER A N D Y O K E P IN
TPM -8205
F ig u re 4 — A s s e m b lin g a n d In s ta llin g R e le a se L
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK S H O P M A N U A L