Holley MCarbHoll2110 1957 Carburetor manual
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3. Install the dashpot adjusting screw 
and nut (If included).
4. Install the throttle stop screw and
5. Install the throttle stop screw and 
spring. While holding the throttle plates almost 
closed, turn the screw in until its tip contacts the 
tab at the end of throttle operating shaft lever.
5. Slide the fast idle cam on the stud 
and install the fast idle cam retainer. - Model 
6. Slide the throttle lever assembly in 
place and insert throttle lever clamp screw and 
6. Install the spark valve assembly 
with a new gasket. (If included).
Install the two idle adjusting springs
and needles.
1. Install bearing on governor side of 
the throttle body. Slide the throttle shaft and bear
ing assembly into the throttle body, and install 
bearing retainer. (Correct position of shaft noted 
during disassembly.)
2. Referring to lines and figures scribed 
on the throttle plates during disassembly, install 
the throttle plates. Insert the four throttle plate 
screws snugly, but do not tighten. Close the throt
tle plates and hold the throttle body up to the light. 
Little or no light should show between throttle 
plates and the walls of the throttle bores. If the 
throttle plates are properly aligned, there will be 
no binding when throttle lever is operated. Using 
an approved staking tool, tighten the throttle plate 
screws. If it is necessary to use an impact type 
of staking tool, be sure to back up the heads of the 
throttle plate screws to prevent bending the throttle
shaft when staking.
3. Install the throttle operating shaft 
assembly in throttle operating housing. Position 
the two screws and lockwashers in the housing. 
Place the new gasket over the ends of the screws 
and with the throttle plates held in the closed 
position, set the assembly in place on throttle 
body, making sure the throttle operating shaft 
lever assembly is in the open position. If the as
sembly is properly installed, the throttle plates 
will be closed when the throttle operating lever 
is up.
4. Install the dashpot adjusting screw 
and nut in the throttle lever clamp. (If included).
Install the two idle adjusting needles, 
with the original springs. Turn the needles by 
hand until they seat in the idle discharge holes. 
Then back them off one complete turn. Do not 
force the needle against its seat, as this will groove 
the tip of the needle, make it impossible to correctly
adjust the idle mixture.
8. Place the diaphragm and rod as
sembly in the governor housing. Take care that 
all the holes in the diaphragm are aligned with 
the threaded holes in the rim of the governor 
housing. The bent end of the rod should point out. 
Place the diaphragm cover in position, making 
sure the vacuum passage holes in the governor 
housing, diaphragm and diaphragm cover are all 
correctly aligned. Insert the diaphragm cover 
screws and lockwashers, spacing evenly the three 
screws drilled for the safety wire. Turnthescrews 
in until the flanges almost meet but do not tighten. 
Place the governor diaphragm gage (Kent-Moore
Tool No. 10-187) on the governor housing as shown 
in the illustration. Hook the end of the diaphragm 
rod into the slot provided in the gage, and then 
tighten the eight diaphragm cover screws securely 
before removing the gage. This procedure will 
stretch the diaphragm sufficiently to insure full 
travel of the diaphragm for proper governor oper
ation. Install a new safety wire and seal.
Figure 35. Installing Governor Diaphragm Cover
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