The Ford Barn

Cape Codder · 08-17-2017, 06:19 PM

Is the Throttle Plate ever completely closed without any clearance between it and the body ?

wrndln · 08-17-2017, 06:28 PM

My carb has a small gap when the idle screw is set correctly. If the plate is totally closed, I don't think the car wouldn't idle.
Rusty Nelson

Patrick L. · 08-17-2017, 06:38 PM

No, not really. But part of rebuilding a carburetor includes backing off the idle speed screw and checking/adjusting the throttle plate for proper fit.

jm29henry · 08-17-2017, 06:40 PM

I agree but with out the set screw not set the throttle plate must fully close with a goog fit ,if you look up toward a light you should not see any light bleeding threw if you do the throttle plate is not seated correctly

Tom Endy · 08-17-2017, 06:52 PM

When installing a throttle plate in a Zenith, I back off the idle adjust screw and loosen the two small plate screws. Then I open and close the throttle smartly several times. This will center the plate in the throat of the carburetor. There is enough play in the plate screws to allow this. Then while holding the plate closed I tighten the two plate screws. The idle adjust screw is then run in to open the plate until the small idle hole in the throat of the carburetor is split by the plate. This will allow for the engine to start up at a high idle. The idle screw can then be adjusted for the desired idle speed.

The engine will not run if the throttle plate is fully closed.

Tom Endy

Cape Codder · 08-17-2017, 09:24 PM

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Thanks to all for the comments. Will finish rechecking and cleaning my carburetor in the a.m.

Larry Jenkins · 08-17-2017, 11:21 PM

Quote:

Originally Posted by Tom Endy

When installing a throttle plate in a Zenith, I back off the idle adjust screw and loosen the two small plate screws. Then I open and close the throttle smartly several times. This will center the plate in the throat of the carburetor. There is enough play in the plate screws to allow this. Then while holding the plate closed I tighten the two plate screws. The idle adjust screw is then run in to open the plate until the small idle hole in the throat of the carburetor is split by the plate. This will allow for the engine to start up at a high idle. The idle screw can then be adjusted for the desired idle speed.

The engine will not run if the throttle plate is fully closed.

Tom Endy

Tom.. You are quite an asset to this Forum..

08-17-2017, 06:19 PM	#1
Cape Codder Senior Member Join Date: May 2010 Posts: 1,262	Carburator Throttle Plate Question Is the Throttle Plate ever completely closed without any clearance between it and the body ?

08-17-2017, 06:28 PM	#2
wrndln Senior Member Join Date: May 2010 Location: Lakeville, MN Posts: 5,162	Re: Carburator Throttle Plate Question My carb has a small gap when the idle screw is set correctly. If the plate is totally closed, I don't think the car wouldn't idle. Rusty Nelson

08-17-2017, 06:38 PM	#3
Patrick L. Senior Member Join Date: May 2010 Location: Largo Florida Posts: 7,225	Re: Carburator Throttle Plate Question No, not really. But part of rebuilding a carburetor includes backing off the idle speed screw and checking/adjusting the throttle plate for proper fit.

08-17-2017, 06:40 PM	#4
jm29henry Senior Member Join Date: Sep 2010 Location: michigan Posts: 1,126	Re: Carburator Throttle Plate Question I agree but with out the set screw not set the throttle plate must fully close with a goog fit ,if you look up toward a light you should not see any light bleeding threw if you do the throttle plate is not seated correctly

08-17-2017, 06:52 PM	#5
Tom Endy Senior Member Join Date: May 2010 Location: Southern California Posts: 3,131	Re: Carburator Throttle Plate Question When installing a throttle plate in a Zenith, I back off the idle adjust screw and loosen the two small plate screws. Then I open and close the throttle smartly several times. This will center the plate in the throat of the carburetor. There is enough play in the plate screws to allow this. Then while holding the plate closed I tighten the two plate screws. The idle adjust screw is then run in to open the plate until the small idle hole in the throat of the carburetor is split by the plate. This will allow for the engine to start up at a high idle. The idle screw can then be adjusted for the desired idle speed. The engine will not run if the throttle plate is fully closed. Tom Endy

08-17-2017, 09:24 PM	#6
Cape Codder Senior Member Join Date: May 2010 Posts: 1,262	Re: Carburator Throttle Plate Question Sponsored Links (Register now to hide all advertisements) Thanks to all for the comments. Will finish rechecking and cleaning my carburetor in the a.m.