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Rain in exhaust pipe.

G

GordoSD

Well-known Member
I moved the tractors yesterday, hooked up the haybine and the rake and then did not put the can on the SH pipe. Sure enough good rain last night.
My question is, when rain or water is poured in the exhaust pipe will it run all the way down to the carb and air hose? Would it have to fill all the way up to the intake ports to get water into the engine. To me it appears water would have to run uphill to get into the intake part of the manifold coming from above?
Where is that rainwater right now? Can I blow it out somehow?
 
Don't know about the H's, but some tractors actually have a small hole in the exhaust manifold to allow the water to escape. You are partially correct. It would take a lot of water to get in the intake and carburetor. However water does have a direct path down the exhaust manifold to the cylinders through the exhaust valves that are open. I would remove the spark plugs and turn the engine over that way. Any water in the cylinders should be expelled through the plug holes. Just don't try to turn the engine over without removing the plugs. If there is water in the cylinders it could cause a hydraulic lock and hurt something in the engine.
 
Bill has it right, just remove the plugs and crank it over and the water will blow out. it would take a lot of rain to get much water in. Invest in a rain cap and you won't need to worry about water in it. They are not expensive.
 
The rainwater is trapped in the exhaust manifold and perhaps in the cylinder with its exhaust valve open.

Quickest/easiest solution: Remove all 4 spark plugs. Then crank the engine for a few seconds. This will "blow out" any water that might have accumulated in a cylinder. Finally replace the plugs and fire it up. If it runs on all 4 you are good to go.

However if you find there's a miss in one cylinder, remove the offending plug, dry it off (a soft flame from a propane torch works well) then stick it back in.

Suggest once you get the engine started, let it run a few minutes to warm it up/dry it out. And don't forget to put your soup can back on the exhaust stack when you are finished!
 
In addition to these suggestions I would blow air into the spark plugs holes while having someone turn it over and then rinse each hole with wd40 while turning engine over.
 
The maniifold on my "50 H has a 1/8" pipe plug in the bottom outside of the manifold. I guess it"s to drain water. You might have one, might get it out, if it"s not rusted in too hard.
 
I have seen the winds we have here blow the caps open and stick open. Tractors are usually in heated shop, but out to hook up implements.
I think we have a hay window opening Tues afternoon. What do you guys think? (MN.SD/IA)
 
Water in the exhaust pipe gets in the cylinders through the EXHAUST valves. It's a direct path. But I doubt you'd get enough water in the cylinders in one rain to cause harm. In all the years I farmed in PA we had a tractor once that got enough water in it it did not want to turn over. And I don't remember taking the injectors out of that one. Yeah, it was a diesel. A gas engine with lower compression would take even more water to hydro-lock
 
I have a souvenir wrist pin from a IH 1086 that sat in a rain storm. When he hit the starter it went bang and busted the pin in half.
 
Pulled the plugs, removed the pipe plug in manifold, cracked the rubber hose at carb to the air cleaner, water did run out of there.
Cranked the motor a few turns then buttoned it all up and it fired on the third revolution. Black smoke for 10 seconds, (rich) and then purred like a kitten like all the SH's do.
Thanks for the help guys. Have never seen this discussed here before.
 
FBH44, that 1/8" plug is a vacuum port. It goes into the intake side of the manifold. One potential use was to power a milking machine during electrical outages. If you remove THAT plug, and water comes out, that tractor has been setting out in the rain for a very long,long time.
 
one other thing i dont see mentioned is to check the oil level if water got through the exhaust valve and sat on top of the piston it could have seeped through the rings and got into the oil. I wouldn't want to see you ruin the bearings or crank due to water in the oil. after it ran the oil should be milky if it has water or may be just seem over full. I think an oil change might be a cheep precaution over the repairs it could cause.
 
I cranked my 51 once not know it had rained in the nite. I got covered in black sooty rain from the muffler. No other problems.
 
How do you work the snot out of a SH? Who has implements that will do that? Maybe something my Honda ATV won't pull LOL
 
> I think we have a hay window opening Tues
> afternoon. What do you guys think? (MN.SD/IA)

I was thinking of starting to mow today here in western Wisconsin. At the very least I"ll get the 560 out and hitch the mower and get everything greased up and checked out. I could just about bail my pastures right now but I"ve only got a couple of crappy bales left to feed the stallion and the ponies.
 
> Invest in a rain cap and you won"t need to worry
> about water in it.

A rain cap is a good idea but don"t rely too heavily on it. Rain can run down the outside of the pipe and get into the manifold past the threads. As someone else mentioned, the caps can also blow open.
 
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