Service Operations; Clutch Assembly - Chevrolet 10 1971 Series Chassis Service Manual

Use 5/8" thick board in place of floor
NOTE:
mat to give a positive stop.
All three readings should be within .010" and
within total lift readings. If more than .010"
check retracting springs per step 2. If trouble
still exists, loosen clutch-to-flywheel mounting
bolt at position of lowest reading (leave other
bolts tight), pry cover, away from flywheel, and
insert feeler gauge (fig. 7) to determine thick­
ness of shim required to bring reading within
. 010".
Total lift readings should be as follows:
L-6 250 .065 to .075
HD 11" .065 to .085

CLUTCH ASSEMBLY

Removal From Vehicle
1. Remove transmission as outlined in "Transmission
Section."
2. Disconnect slave cylinder from clutch fork.
3. Remove clutch throwout bearing from the fork.
4. Remove clutch fork by pressing it away from its ball
mounting with a screwdriver, until the fork snaps
loose from the ball or remove ball stud from rear of
clutch housing.
The retainer may be removed from the
NOTE:
fork by prying out with a small screwdriver.
5. Install Tool J-5824 or a used clutch drive gear
to support the clutch assembly during removal.
6. Loosen the clutch attaching bolts one turn at a time
to prevent distortion of clutch cover until dia­
phragm spring is released.
7. Remove clutch pilot tool and remove clutch assembly
from vehicle.
Installation to Vehicle
1. Install the pressure plate in the cover assembly lin­
ing up the notch mark on pressure plate with notch
mark on flange of cover.
2. Install pressure plate retracting springs and drive
strap to pressure plate bolts and lockwashers and
tighten to 11 ft. lbs. torque. The clutch is now ready
to be installed.
3. Hand crank the engine until
at the bottom.
4. Install clutch disc, pressure plate and cover assem­
bly and support them with Tool J-5824 or a used
clutch drive gear.
5. Turn clutch assembly until " X " mark on clutch
cover flange lines up with " X" mark on flywheel.
6. Install attaching bolts and tighten each one a turn at a
time to prevent distorting the cover as the spring
pressure is taken up.
7. Remove clutch pilot Tool.
8. Pack clutch fork ball seat with a small amount of
high melting point grease and install a new retainer
in the groove of the clutch fork if the old retainer is
worn or damaged.

SERVICE OPERATIONS

"X"
mark on flywheel is
CLUTCHES AND TRANSMISSIONS 7-5
Make sure proper pedal lash adjustment is made be­
fore checking.
Excessively high readings indicate that
NOTE:
the diaphragm spring is being over stressed
which may eventually cause loss of load and
result in slippage.
If above measures fail to correct the trouble, check
driven disc with clutch pedal depressed (it should spin
freely with transmission in neutral). If it does not,
trouble may be:
1. Misalignment between pilot bushing in crankshaft and
clutch housing.
2. Faulty clutch pilot bushing.
3. Faulty driven disc.
Install retainer with high side up, away
NOTE:
from bottom of the ball socket and with open end
of retainer on the horizontal.
Be careful not to use too much
CAUTION:
lubricant.
9. Replace clutch fork ball if removed from the clutch
housing and snap clutch fork onto the ball.
10. Pack lubricant in the recess on the inside of the
throwout bearing collar and coat the throwout fork
groove with a small amount of graphite grease
(fig. 8).
11. Install throwout bearing assembly to the throwout
fork.
COAT THIS GROOVE
PACK
THIS
RECESS
Fig. 8— Lubrication Points on C lutch Throwout Rearing
10-30 CHEVROLET TRUCK SERVICE MANUAL