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Old 11-16-2011, 12:11 PM   #1
jim1932
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Default 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
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Old 11-16-2011, 01:05 PM   #2
Tom Wesenberg
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Default 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.
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Old 11-16-2011, 02:38 PM   #3
Bruce Lancaster
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Default 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.
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Old 11-16-2011, 03:52 PM   #4
mot
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Default 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
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Old 11-16-2011, 05:13 PM   #5
jim1932
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Default Re: Zenith dissasembly

I will try the rust remover tonight. Nothing else seems to do a thing.
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Old 11-16-2011, 05:20 PM   #6
ursus
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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.
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Old 11-16-2011, 10:44 PM   #7
jim1932
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Default Re: Zenith dissasembly

Well the rust remover worked.
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Old 11-17-2011, 10:12 AM   #8
Ray in La Mesa
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Default Re: Zenith dissasembly

Thanks for letting us know the outcome.
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Old 11-17-2011, 01:13 PM   #9
Brentwood Bob
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Default Re: Zenith dissasembly

what product did you use? Bob
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Old 11-17-2011, 03:12 PM   #10
Brentwood Bob
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Default Re: Zenith dissasembly

Navel Jelly?
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Old 11-17-2011, 03:19 PM   #11
jim1932
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Default 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.
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