Chevrolet 10 Series 1970 Service Manual page 440

CLUTCHES AND TRANSMISSIONS 7-10
F ig . 16—G a u g in g Shim R equirem ent
2. Check clutch retra ctin g springs fo r p rop er retention
of p ressu re plate to diaphragm spring, rep la ce if
n ecessary. T his can be done without rem ovin g clutch
fro m veh icle.
3. If Steps 1 and 2 do not cure trouble, check pressu re
plate lift with dial indicator (fig .
a. W ith p rop er linkage adjustment (and lash), z e ro
indicator with clutch fu lly engaged (pedal up).
b. M easure p res su re plate lift at 3 strap bolt p o s i­
tions with fu ll pedal tra v el.
CLUTCH ASSEMBLY
R em oval From Vehicle
1. R em ove tran sm ission as outlined in "T ra n s m is s io n
Section."
2. Disconnect slave cylin d er fro m clutch fork.
3. R em ove clutch throwout
4. R em ove clutch fo rk by p ressin g it away fro m its ball
mounting with a s c re w d riv e r, until the fo rk snaps
loose fro m the b all or rem ove b all stud fro m re a r of
clutch housing.
NOTE: The re ta in e r m ay be rem oved fro m the
fo rk by p rying out with a sm all s c re w d riv e r.
5. Install T o o l J-5824 to support the clutch assem bly
during rem oval.
6. Loosen the clutch attaching bolts one turn at a tim e
to p revent distortion
phragm spring is relea sed .
7. R em ove clutch p ilot tool and rem ove clutch assem bly
fro m veh icle.
Installation to Vehicle
1. Install the p ressu re plate in the c o v e r assem bly lin ­
ing up the notch m ark on pressu re plate with notch
m ark on flange of co ver.
2. Install p ressu re plate retra c tin g springs and d rive
strap to p ressu re plate bolts and lockw ashers and
tighten to 11 ft. lbs. torque. The clutch is now ready
to be in stalled.
16) as follow s:
SERVICE OPERATIONS
bearing fro m the fork.
of clutch c o v e r until dia­
NOTE: Use 5/8" thick board in place of flo o r
mat to give a positive stop.
A ll three readings should be within .010" and
within total lift readings.
check retra ctin g sprin gs p er step 2. If trouble
s till exists, loosen clu tch -to-flyw h eel mounting
bolt at position of low est reading (le a v e other
bolts tight), p ry co ver, away fro m flyw h eel, and
in se rt fe e le r gauge (fig . 16) to determ in e thick­
ness of shim req u ired to b rin g reading within
. ".
010
Total lift readings should be as follow s:
L -6 230 .065 to .075
HD 11" .065 to .085
Make sure p rop er pedal lash adjustment is made be­
fo r e checking.
NOTE: E x ce ss iv ely high readings indicate that
the diaphragm spring is being o v e r stres s ed
which may eventually cause loss of load and
resu lt in slippage.
If above m easures fa il to c o r r e c t the trouble, check
driven disc with clutch pedal depressed (it should spin
fr e e ly with tran sm ission
trouble may be:
1. M isalignm ent between pilot bushing in crankshaft and
clutch housing.
2. Faulty clutch pilot bushing.
3. Faulty driven disc.
4. Im proper sla ve cylin der adjustment.
COAT THIS GROOVE
PACK
THIS
RECESS
F ig . 17— L u b ric a tio n Points on C lu tc h Throw out
If m ore than .010"
in neutral). If it does not,
CHEVROLET TRUCK SERVICE MANUAL