Condensation with rain cap.

[REP]

I am new, first post.
Just got a 49' that has been sitting since 91', got her running pretty well. Engine was locked up, stuck valves, and all related tuning, fluids and tweaking. For now using 12V battery just for starting (no charging for the moment) and using magneto for spark. It had Champion D16's in it so replace with same, did not give the spark I wanted. Switched to D21's and wow what difference.
Wish I had looked at this site before I got the tractor, made mistake of getting carb kit for TSC, piece of trash. Have gotten lots of info from you and enjoy the read, lots of knowledge here, and I am sure most of it is hard knock smarts.
Sorry to be so long winded.
To my topic, thought a rain cap on my straight pipe would be cool. After running and letting cool, noticed a very light amount of moisture coming out pipe. I don't like it. Any thoughts?
Thanks in advance
Randy

[Eugene]

Welcome.

Define moisture; drops, mist, fumes, smell, color, length of time?

It takes a few seconds for the engine and manifold to heat up enough to burn off any condensation.

The rain cap is to prevent rain water from entering the exhaust pipe. Won't prevent condensation.

[Peter Person]

Randy,
Welcome to the forum.
Since the tractor sat for 30 years and it sounds like you had to do a fair amount of work to get it loose and running, did you prime the oil pump?

[SamsFarm]

I think what you are seeing is the condensation from warm exhaust going through the cold pipe / muffler, until your muffler warmes up to operating temperature!

If your tractor is sleeping outside and you want to be sure that rain is not getting in there, throw a bucket or can over the exhaust stack.

See what happens!

[Stanton]

Welcome to the Forum, Randy! You stated that you had run the tractor, then let it cool. How long did you let it run and did it get up to operating temp? You live in the panhandle of FL, so a very humid environment anyway. Where was the moisture noticed, between the muffler and exhaust pipe or at the top of the muffler near the rain cap?

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[Gary Dotson]

I don't think your condensation has anything to do with the rain cap, I've always ran them on any vertical exhaust tractors with no issues. It probably has more to do with environment. Cold metal becomes an excellent condenser. I don't know how much you've run the tractor but I'd run it as hard as you can to fully warm it up, cover part of the radiator, if it's cold, to get the moisture burned out well, then see what you get. Also, welcome to the group!

[REP]

Thanks for all info and welcomes.
Very little moisture blowing from inside wall of pipe, for 30 seconds or so, when cap opens. Just don't want moisture settling in manifold/engine, causing harm.
Inside barn, just like look of cap blowing open.
Total run time so far is about 2 hours. Oil pressure up to 45 psi on gauge that reads 18 with engine off. (need new one)
Again thanks to all

[SamsFarm]

I think you'll be alright.

Sounds like normal operation.

Next time you start your car or truck to preheat it while it is cold outside, go look at the exhaust outlet.
It will probably be steaming and dripping some!

Happy tractoring!

[Barnyard]

Agree with Gary on the exhaust. There is no need for a bucket or bean can on the exhaust as long as you have a rain cap and the weep hole on the bottom of the manifold is not clogged you should have no problem with moisture going into the engine.

[Peter Person]

Thanks for all info and welcomes.
Very little moisture blowing from inside wall of pipe, for 30 seconds or so, when cap opens. Just don't want moisture settling in manifold/engine, causing harm.
Inside barn, just like look of cap blowing open.
Total run time so far is about 2 hours. Oil pressure up to 45 psi on gauge that reads 18 with engine off. (need new one)
Again thanks to all

There is a drain hole in the exhaust manifold that often gets plugged by bugs or a previous owner with a screw.
On the first page of this thread, Dale posted some photos of the drain hole.
http://www.farmallcub.com/phpBB2/viewtopic.php?f=1&t=108432&p=860324&hilit=exhaust+manifold+drain+hole#p860324

[Dale Finch]

Agree with Gary on the exhaust. There is no need for a bucket or bean can on the exhaust as long as you have a rain cap and the weep hole on the bottom of the manifold is not clogged you should have no problem with moisture going into the engine.

In case someone is not familiar with this drain hole (I've seen some where a PO has plugged it with a screw), here is an old post with a good photo of it:

http://www.farmallcub.com/phpBB2/viewtopic.php?t=96496

Wow! Peter types fast!!!

[REP]

Wee hole? Was not aware. That's the info I was looking for. Great picture link.
Very rusty, will look for that.
Makes me feel better knowing moisture has an escape, very little moisture but don't want to cause a problem.
Thanks

[REP]

Found the weep hole in manifold. Not an easy find through all the rust. Used small drill bit, turning by hand and pliers and got through, then went to larger bit. Small amount of exhaust exits the weep hole. Very pleased. You guys are awesome, with suggestions, thoughts and the links to pictures for Peter and Dale.
Could not have found without pictures, so much rust.
Again thanks for all the help.
Great group.

[Stanton]

Found the weep hole in manifold. Not an easy find through all the rust. Used small drill bit, turning by hand and pliers and got through, then went to larger bit. Small amount of exhaust exits the weep hole. Very pleased. You guys are awesome, with suggestions, thoughts and the links to pictures for Peter and Dale.
Could not have found without pictures, so much rust.
Again thanks for all the help.
Great group.

That's why we're here. Glad you got it done to your satisfaction.

[halftonstude]

I have a cap and left the weep hole rusted shut I was concerned the exhaust would blow out and make a mess. After I first rebuilt my engine during a complete restoration I noticed condensation all over; dipstick, breather, it always drips out the bottom of the muffler for a few after startup, even the oil had a little milky shakey look. I ran it a couple hours in the driveway changed the oil but to little avail. When I started using it to rake 200 acres it disappeared. Still the little drip from the muffler at startup but after it works hard for a bit it cleans right up and dries out. The experts here are full of valuable time achieved and time proven wisdom I’ve learned to trust. I guess I could seal the muffler to the pipe but other than that I have no concerns or worries about the lack of condensation elsewhere now. Just needs to get out and get working to keep the insides dry. I am surprised there was as much as there was... you’d think a hot engine wouldn’t keep moisture like that. Well it needed to get a little hotter..
Welcome!
C