CLUTCH
11.
BLEEDING
Tm
HYDRAULIC
SYSTEM
Bleeding is only necessary when a portion
.of the system has been disconnected or if
the level of the fluid has been allowed to
fall so low that air has been allowed. to
enter the system. If bleeding is carried out
for the latter reason the brake system will
need to be bled also, as they share the
same reservoir.
(a)
Fill the reservoir with Lockheed Brake
Fluid and keep at least half full
throughout the operation. Failure to
observe this point may lead to air
being drawn into the system and the
operation of bleeding
will
have to be
repeated.
(b)
Attach a length of rubber piping to the
bleed screw and allow the free end to
14'
be submerged in a little Lockheed
Brake Fluid contained in a
clean
glass
jar, open the bleed port by giving the
screw one complete turn.
(c) Depress the clutch pedal with a slow
full stroke and before the pedal reaches
the end of its travel the bleed screw is
tightened sufficiently to seat it.
(d)
Repeat the operation (c) until air
bubbles cease to appear from the end
of the tube.
(e) Ensure that there is sufficient fluid in
the reservoir, at least half full, and
replace cap first, ensuring that its seal
is in good order and its vent is un-
obstructed.
12.
GREASING OF THE CLUTCH
OPERATING SHAFT
Hand grease gun lubrication should be used
when greasing this shaft. Two strokes of the
gun to each nipple after 5,000 miles
(8,000
km.) of running will provide adequate
lubrication
Over lubrication, from generous use of
15.
pressure lubricating may lead to grease
finding its way on to the clutch facing.
13.
ADJUSTING THE CLUTCH
The adjustment connection between pedal
and master cylinder is set on initial assembly
and should not need readjustment.
During complete overhauls or the repair of
accidental damage the master cylinder may
have to be disturbed. Its replacement is
dealt with in the Brake Section
"R"
and the adjustment is described in this sec-
tion below.
The clutch pedal will provide no sensitive
indication of loss of release bearing
clearance
(h")
consequent upon wear of
the facings. Adjustment at the slave
cylinder fork assembly must therefore be
checked periodically, at whatever intervals
the operating conditions may dictate. The
adjusting sequence is described below.
The adjustment is said to be correct when
there is
,079" end float in the slave cylinder
fork assembly.
ADJUSTING THE MASTER
CYLINDER
It is important to provide .030" free travel of
the push rod before it reaches the piston.
This clearance is necessary to ensure that
the piston will return to its stop in its cylin-
der and thus prevent the possibility of the
lip of the main cup covering the by-pass
port. If such a condition were to exist the
excess fluid drawn into the cylinder during
the return stroke of the piston will find no
outlet and pressure will build up
in
the
system causing the clutch to "slip".
(a)
Loosen the jam nut of the clutch pedal
stop at the forward end of the master
cylinder support bracket.
(b)
Turn the adjuster screw inwards and
testing the push rod eliminate all end
float. Tighten
jam
nut finger tight,
holding adjuster screw.
(c) Unscrew the adjuster together with the
jam nut until a .030" feeler
can
be
placed in between the jam nut and the
master cylinder bracket.
(d)
Holding adjuster screw, lock
jam
nut
to the bracket.
ADJUSTING
THE
SLAVE CYLINDER
(a)
Unlock the jam nut on the slave cylin-
der fork assembly.
(b)
Turn the rod until ALL end float is
just eliminated.
(c)
Hold the push rod and turn the jam nut
until a .079" feeler gauge
will
pass in
bemeen the nut
and
the fork end.
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