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Farmall & IHC Tractors Discussion Forum
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Missing screw

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OBie

10-14-2005 05:53:12




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I have a 1941 H that is only run in parades and shows.Last weekend in a parade at topsfield fair in ma.Tractor started runnig very rich and alot of black smoke.What had happened was the screw on the butterfly of the choke had fallen out,so it was being choked as it ran.I have not been able to find the screw,would this have got sucked into the motor?Took carb apart it was nowere to be found.Tractor now running great again but worried about where the screw is.

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Illinois Boy

10-14-2005 11:02:18




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 Re: Missing screw in reply to OBie , 10-14-2005 05:53:12  
At any rate, you"ll need Rusty Farmall"s Carb Rebuild kit to get everything back in order...



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Wardner

10-14-2005 06:44:28




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 Re: Missing screw in reply to OBie , 10-14-2005 05:53:12  
Is this parade prior to the farm tractor pull or a separate event? I used to pull there and have a couple of ribbons. I live in Middlesex county and they prefer only participants from Essex.



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Bob M

10-14-2005 06:33:05




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 Re: Missing screw in reply to OBie , 10-14-2005 05:53:12  
I gotta agree with Hal on this one. The screw probably fell out unnoticed when you first pulled off the air cleaner tube.

Highly unlikely it got sucked up into the engine. Unless the engine is run fully loaded at maximum RPM there is simply not enough air velocity thru the choke area to pick up and carry the screw up into the engine.

Further, even if the screw DID make it into the engine combustion chamber clearances in the (relatively low compression) H are simply too large for it to be a problem. The screw would likely get knocked around inside for a few combustion cycles - and maybe peen the piston top a bit - then pass unnoticed out through the exhaust.

My opinion: If the engine is running OK now I wouldn't give it another thought...

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Allan in NE

10-14-2005 06:52:20




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 Re: Missing screw in reply to Bob M, 10-14-2005 06:33:05  
I agree,

If in fact it got swallowed, there is so much room in that particular combustion area, that tiny little brass screw would fly right thru completely un-noticed.

If it did do any damage, that engine would be talking by now.

Allan



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RustyFarmall

10-14-2005 07:00:06




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 Re: Missing screw in reply to Allan in NE, 10-14-2005 06:52:20  
Originally would have been a brass screw, most likely replaced with a steel screw by now. Today's carb kits do not come with brass screws anymore.



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Allan in NE

10-14-2005 07:18:26




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 Re: Missing screw in reply to RustyFarmall, 10-14-2005 07:00:06  
Yep,

That's probably why it took a powder. The originals were brass and "peened" so that they would stay in there.

People take 'em out and then they loose the 'riveting or oversized' effect with steel screws.

The darned things do better if ya just never touch 'em. :>)

Allan



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RustyFarmall

10-14-2005 06:18:55




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 Re: Missing screw in reply to OBie , 10-14-2005 05:53:12  
Most likely the screw got pulled into the motor and has imbedded itself into the top of a piston. If the engine is running fine now, and you don't hear any unusual ticking sounds, then I wouldn't worry about it. There is no way it could have just fallen out provided the intake tube from the air cleaner is in place. And even if you were running the tractor without the air cleaner, the screw would still have been sucked into the motor.

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Janicholson

10-14-2005 06:17:51




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 Re: Missing screw in reply to OBie , 10-14-2005 05:53:12  
If the screw is sucked into the engine (and it has few other places to go) either it will, and may have, passed unnoticed out the stack. It could be lurking in an intake runner, or bouncing on the back side of an intake valve. If it were mine and, as you indicated, it was running fine, I would pull off the manifold assembly and check for the screw. I would look in each head runner to the intake valves (make sure the valve was shut by hand cranking, then blow with a compressed air nozzle with a 1/4" I.D. tube attached to get into the area of the valve head to blow outward.

If no screw (or if I found it) I would button it up and go on with life.

There is a very good chance the screw is on the parade route, having passed through with little if any impact. If it was still in a cylinder, it would have encountered the squish area and be embedded in the piston top making a very noticable noise, or smashed the ring lands and mangled a piston/cyl.

I'd run it after checking the intake as insurance. My two cents, JimN

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Allan in NE

10-14-2005 06:17:24




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 Re: Missing screw in reply to OBie , 10-14-2005 05:53:12  
Obie,

Even if the engine swallowed it, it probably didn't hurt it any if you are not hearin' any strange noises.

I used to work on carburetors a lot and have seen lots of 'em come in the door without those little guys.

Have seen engines eat glow plug tips, spark plug parts, air clearer wing nuts and all sorts of junk without any ill effects.

Allan



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El Toro

10-14-2005 06:03:18




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 Re: Missing screw in reply to OBie , 10-14-2005 05:53:12  
That carburetor is an updraft and it probably just fell out on the ground. Hal



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Janicholson

10-14-2005 06:22:11




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 Re: Missing screw in reply to El Toro, 10-14-2005 06:03:18  
I assumed in my post that the intake system was complete with air cleaner, steel supply elbow, and rubber connector hose and clamps. Further, that you checked backward into the hose and pipe.
Good luck, JimN



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