Workshop
Manual
Rolls Royce Silver Shadow
8
Bentley
T
Series
Chapter
K
FIG.
K32
FAST-IDLE MECHANISM
AND
VACUUM RETARD TAP
1
Vacuum retard tap adjusting screw
2
Control rod
3
Vacuum retard tap
4
Fast-idle adjusting screw
5
Cam
6
Cam link
'Fast-idle' cam and Vacuum retard
tap
1.
Fit the 'fast-idle' mechanism; do not tighten the
'fast-idle' lever clamping bolt.
2.
Ensure that the 'fast-idle' adjustment screw is
directly over the cam.
3.
With the throttles closed, insert a 0.100 in. (2,54
mm.) diameter rod between the top of the 'fast-idle'
cam and the boss under the 'fast-idle' adjustment
screw. Tighten the clamping bolt on the 'fast-idle'
lever.
4. Check that there is sufficient clearance between
the cam link, which is mounted alongside the
'fast-
idle'
cam,
and the boss on the 'fast-idle' lever. Insuffi-
cient clearance at this point can result in the cam link
fouling the 'fast-idle' lever. In the event of this happen-
ing the 'fast-idle' lever would be prevented from
returning to the closed throttle position, thus causing
a
'fast-idle' speed.
5.
Ensure that the throttles are closed; screw in the
'fast-idle' adjustment screw until it just makes contact
with the top step of the 'fast-idle' cam.
6.
Insert a 0.100 in. (2,54
mrn.)
diameter rod
between the leading
edw of the choke butterfly valve
and the choke housing
7.
With the butterfly valve in this position, adjust
the length of the butterfly rod so that the tip of the
'fast-idle' screw is in line with the start of the top step
of the
'fast2idle' cam, (i.e. the position when the tip of
the adjustment screw is about to fall from the top step
to the bottom step of the cam).
Remove the
0.100 in. (2,54 mm.) diameter rod from
the choke housing.
8.
With the throttles closed and the choke partly
open, adjust the 'fast-idle' adjustment screw to just
contact the start or bottom step of the 'fast-idle' cam;
tighten the lock-nut ensuring that the adjustment screw
does not move.
9.
Cars from
SRX
9001
and onwards fitted with the
Exhaust Emission Control System.
Ensure that the
throttles are in the fully closed position. With the
vacuum retard tap in the fully open position
(i.e. the
plunger on the tap pushed in) adjust the vacuum retard
tap adjusting screw until a gap of
0.025.in. (0,635 mm.)
between the adjusting screw and the vacuum retard
tap is obtained.
Thermocoil
Adjustment of the thermocoil is carried out in a tem-
perature controlled room and under no circumstances
should adjustment be attempted without specific
instructions from the factory.
The factory setting is indicated by an arrow stamped
on the pointer. Should any trouble be encountered this
setting should be checked.
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