ASSEMBLY - CONT

FUEL

being reamed. A lathe may be substituted

The following procedure should be adhered to for proper

for the drill press in performing the

installation of the throttle shaft bushings. To properly re-

counter-boring

and

line

reaming

bush the throttle body of the carburetor, it is absolutely

operations.

necessary to have available the proper counterbore

reamer, line reamer and bushing drive tool.

17. Install throttle shaft and lever assembly and

a. Place a suitable centering cone in the bed

throttle plate in throttle body.

of a drill press. With one throttle shaft

18. Any deviation from the following instructions will

hole on this center, bring the spindle down

result in poor idle and low speed performance. Use new

until the counterbore reamer contacts the

screws and do not attempt to rivet threaded ends. (A

opposite shaft hole.

drop of shellac may be used for sealing.)

Use correct reamer to obtain proper press

a. Back out throttle stop screw in throttle

fit on the outside diameter of the throttle

lever. Place the throttle body assembly

shaft bushing.

on bench with mounting flange up.

b. With the casting still in place as described

b. Insert throttle shaft and lever assembly

in the above paragraph, set the stop on

with throttle lever pointing down.

the press to the length of the bushing.

c. Rotate the throttle shaft to face the cut-out

Check that the proper length bushing is

section in center. The threaded ends of

being used for the particular shaft hole

the screw holes will then be facing the

being counterbored.

idling port plug.

c. The hole is then counterbored to

d. Insert the throttle plate, starting the side of

accommodate the bushing.

the plate with the shortest distance

d. A throttle shaft bushing is driven into

between screw holes and the beveled

place using the proper bushing driver tool.

edge, into the shaft first. Center it, and

e. The bushing is then reamed with the line

then rotate shaft counterclockwise to

reamer. Use the opposite shaft hole as a

close.

"pilot" to align the line reamer in the

e. Turn the throttle body over and start the

bushing.

screws into shaft loosely. Tap the plate

f. Now turn the casting over and prepare the

lightly to center it and tighten screws

opposite hole to take the bushing. It will

firmly. Throttle plate screws are never

be necessary to reset the stops on the

installed from the mounting flange side of

spindle again as described before. Then

the casting.

counterbore the hole.

f. To properly center the plate in the throttle

g. Drive the second throttle shaft bushing

body bore, the screws should be started in

into position.

the shaft and then with the plate closed, it

should be tapped

h. Then line ream the inside diameter as the

final machining operation.

Pilot line

reamer from side opposite bushing that is

B-42