[AT] Zenith Stuck Jet Removal

[charlie hill]

Dean I tried to heat a pot metal housing from a fan clutch with a propane 
torch once and determined that it can't be done!  LOL.
I was warned not to try it but didn't have anything to loose except the gas 
in the torch.

Ben if you want to try heating it you might want to try putting it in the 
oven and heating it to 400 or 500 degs.  Then stick it in the freezer or
in a bucket of ice water or something.  I'm just guessing about that.  I've 
never tried it but I agree with Deans warnings.

You could try left handed drill bits if you can find some.  They might turn 
the jets out as you drill them.  Of course if that doesn't work
you are in a mess.

Charlie


-----Original Message----- 
From: Dean VP
Sent: Thursday, July 26, 2012 10:17 PM
To: 'Antique tractor email discussion group'
Subject: Re: [AT] Zenith Stuck Jet Removal

Ben,

Are you sure it is aluminum rather than pot metal?  The way we remove Brass 
plugs in cast
iron carburetors is we heat the brass until it just starts to discolor. Then 
let it cool
off. The brass will then come out very easily. Unfortunately aluminum has a 
lower melting
point than brass so this method may not work. I don't know what the melting 
point is on
Pot Metal either. But some method of heat application should solve your 
problem.

Dean VP
Snohomish, WA

"Do not go where the path may lead; go instead where there is no path and 
leave a trail."
- Ralph Waldo Emerson


-----Original Message-----
From: at-bounces at lists.antique-tractor.com 
[mailto:at-bounces at lists.antique-tractor.com]
On Behalf Of Ben Wagner
Sent: Thursday, July 26, 2012 6:45 PM
To: Farmall/IHC mailing list; Antique tractor email discussion group
Subject: [AT] Zenith Stuck Jet Removal

Hello,

I am in the process of rebuilding a Zenith carburetor on a Gravely L; I know 
this is a
tractor group, but we do have Zeniths on tractors!  This Zenith is nearly 
identical to the
ones on my Farmall A's.  Someone along the way attempted (vainly) to remove 
the brass

~main jet
~main jet passage plug
~well vent jet
~idle jet

and did a terrible job of using a screwdriver.  The notches are stripped! 
Furthermore,
whoever installed them either torqued the jets or applied a sealant.  I had 
enough left to
get my screwdriver in place, but even after days of soaking in penetrating 
fluid, the
parts will still not budge.  My screwdriver doesn't have enough power, even 
clamped in a
vise with all my weight on the turn.  I don't want to damage the aluminum 
bowl, or the
threads, so I need a way to extract these stubborn parts.

I was able to remove the needle seat with my screw extractors since the 
notches were
stripped on it also.  However, the little jets are either too shallow for my 
extractors to
get enough grip into the brass, or they are too small for any jet.

Has anyone encountered a similar issue?  How did you get these stubborn 
characters out?

Thanks for your help,
Ben Wagner
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