 |
 |
40 of 40 |  |
 |
 |
satisfactory idle mixture setting.
Repeat this pro
cedure with the other needle. If
this adjustment
results in an increased idle rpm,
reset the idle
speed screw to obtain the specified
idle rpm, and
again adjust both idle adjusting
needles.
B. Adjusting the Automatic Choke
1. The automatic choke is accurately
set at
the factory to give the best possible
all weather
operation. To return the choke to
the original
setting, line up the index mark
on the rim of the
thermostat cover with the large
center indicator
on the choke housing.
2. If for some reason a richer or
leaner mix
ture during the warm-up period is
desired, it can
be obtained by rotating the thermostat
cover.
Never set the index mark on the
cover more than
two graduations off the large center
indicator on
the housing.
C. Adjusting the Dashpot
1. Start the engine and allow it
to reach
normal operating temperature with
the automatic
transmission drive selector in neutral.
2. Turn the dashpot adjusting screw
down
until it no longer fully compresses
the dashpot
stem when the engine is idling at
its normal oper
ating temperature. If the dashpot
adjusting screw
is set too high, it will compress
the stem fully and
stop the throttle lever before reaching
the idle
position. This will result in a
high idle speed and
make it impossible to reach a lower
idle speed
adjustment with the idle speed screw.
3. Set the idle speed and mixture
according
to preceding instructions, being
certain the idle
speed screw is on the low step of
the fast idle cam.
4. The dashpot adjusting screw should
then be
set so that the specified clearance
exists between
the adjusting screw and the dashpot
stem when the
stem is fully compressed. The proper
clearance
for the Mercury dashpot equipped
carburetors can
be found in the current Holley Carburetor
Specifi
cations Catalog, Section IV, Division
C.
