The Ford Barn

jim1932 · 11-16-2011, 12:11 PM

Ok now I am having issues with the throttle on a model B zenith. The screws are out of the butterfly but the shaft will not rotate to an open position. I can't drive the shaft out unless I get the butterfly out. Soaked it in penetrating oil. Applied heat and still nothing. I have also tried rapping the shaft with a punch thinking it would break it loose. Should I thy more heat?

Tom Wesenberg · 11-16-2011, 01:05 PM

I would let it soak with Kroil and try to move the throttle lever and plate at the same time. Light tapping, soaking, heat, and gentle turning should get it to move. Once it moves a little, then you're home free.

Bruce Lancaster · 11-16-2011, 02:38 PM

Frequently you can start things loosening with axial/endwise movement of the shaft. if thoroughly stuck you can't start with rotational force or everything will just twist.
Usually you can get a bit of endways motion and work back and forth with lots of solvent.

mot · 11-16-2011, 03:52 PM

ive just opened at least 50 shocks
i have freed every one of them using electrolysis over night
and if the shaft was still stuck,a little heat was applied to the carb body and they all came out with no forcing,not one was damaged
tom

jim1932 · 11-16-2011, 05:13 PM

I will try the rust remover tonight. Nothing else seems to do a thing.

ursus · 11-16-2011, 05:20 PM

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Since the shaft and casting are made of metals with different expansive properties try this: place the casting in the oven and heat to 400 degrees F., then place it on a piece of newspaper in the freezer. As the parts cool, the shaft should free up. Pull it from the freezer after about 5 minutes and shoot some penetrant around the edges. As it cools further it should pull the penetrant into the shaft bores to better loosen things up. This works for stuck venturis also.

jim1932 · 11-16-2011, 10:44 PM

Well the rust remover worked.

Ray in La Mesa · 11-17-2011, 10:12 AM

Thanks for letting us know the outcome.

Brentwood Bob · 11-17-2011, 01:13 PM

what product did you use? Bob

Brentwood Bob · 11-17-2011, 03:12 PM

Navel Jelly?

jim1932 · 11-17-2011, 03:19 PM

I have a bucket of evapo-rust. Soaked it overnight. That and some move it or break it preassure on the shaft got it moving. Bent up the butterfly though.

11-16-2011, 12:11 PM	#1
jim1932 Senior Member Join Date: Oct 2010 Location: Hancock, MA Posts: 2,810	Zenith dissasembly Ok now I am having issues with the throttle on a model B zenith. The screws are out of the butterfly but the shaft will not rotate to an open position. I can't drive the shaft out unless I get the butterfly out. Soaked it in penetrating oil. Applied heat and still nothing. I have also tried rapping the shaft with a punch thinking it would break it loose. Should I thy more heat? Last edited by jim1932; 11-16-2011 at 12:13 PM. Reason: Typo

11-16-2011, 01:05 PM	#2
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Zenith dissasembly I would let it soak with Kroil and try to move the throttle lever and plate at the same time. Light tapping, soaking, heat, and gentle turning should get it to move. Once it moves a little, then you're home free.

11-16-2011, 02:38 PM	#3
Bruce Lancaster Member Emeritus Join Date: May 2010 Location: Madison, NJ Posts: 5,230	Re: Zenith dissasembly Frequently you can start things loosening with axial/endwise movement of the shaft. if thoroughly stuck you can't start with rotational force or everything will just twist. Usually you can get a bit of endways motion and work back and forth with lots of solvent.

11-16-2011, 03:52 PM	#4
mot Registered User Join Date: May 2010 Location: Sacramento Ca Posts: 1,179	Re: Zenith dissasembly ive just opened at least 50 shocks i have freed every one of them using electrolysis over night and if the shaft was still stuck,a little heat was applied to the carb body and they all came out with no forcing,not one was damaged tom

11-16-2011, 05:13 PM	#5
jim1932 Senior Member Join Date: Oct 2010 Location: Hancock, MA Posts: 2,810	Re: Zenith dissasembly I will try the rust remover tonight. Nothing else seems to do a thing.

11-16-2011, 05:20 PM	#6
ursus Senior Member Join Date: May 2010 Location: Oregon Posts: 1,462	Re: Zenith dissasembly Sponsored Links (Register now to hide all advertisements) Since the shaft and casting are made of metals with different expansive properties try this: place the casting in the oven and heat to 400 degrees F., then place it on a piece of newspaper in the freezer. As the parts cool, the shaft should free up. Pull it from the freezer after about 5 minutes and shoot some penetrant around the edges. As it cools further it should pull the penetrant into the shaft bores to better loosen things up. This works for stuck venturis also.

11-16-2011, 10:44 PM	#7
jim1932 Senior Member Join Date: Oct 2010 Location: Hancock, MA Posts: 2,810	Re: Zenith dissasembly Well the rust remover worked.

11-17-2011, 10:12 AM	#8
Ray in La Mesa Senior Member Join Date: May 2010 Location: La Mesa Ca Posts: 1,273	Re: Zenith dissasembly Thanks for letting us know the outcome.

11-17-2011, 01:13 PM	#9
Brentwood Bob Senior Member Join Date: May 2010 Location: brentwood, ca Posts: 4,420	Re: Zenith dissasembly what product did you use? Bob

11-17-2011, 03:12 PM	#10
Brentwood Bob Senior Member Join Date: May 2010 Location: brentwood, ca Posts: 4,420	Re: Zenith dissasembly Navel Jelly?

11-17-2011, 03:19 PM	#11
jim1932 Senior Member Join Date: Oct 2010 Location: Hancock, MA Posts: 2,810	Re: Zenith dissasembly I have a bucket of evapo-rust. Soaked it overnight. That and some move it or break it preassure on the shaft got it moving. Bent up the butterfly though.