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1939 U engine questions blowing oil

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Tully123
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PostPosted: Thu Jan 03, 2019 6:15 pm    Post subject: 1939 U engine questions blowing oil Reply to specific post Reply with quote

Hello, I posted several months ago about bringing home my Grandfather’s 1939 U. It hasn’t run in probably 50 years. After puttering around for months my friend and I finally got it to run over the long weekend. It was very rewarding.

The problem I am having is that it burns and blows a lot of oil. More than I have ever seen. The shop has drops of oil all over everything. Still worth it!

What would be the best guess on the problem? Rings? Valve guides? Just looking for some direction before I tear into it.

Thanks for your time.
 
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rustred
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PostPosted: Thu Jan 03, 2019 7:12 pm    Post subject: Re: 1939 U engine questions blowing oil Reply to specific post Reply with quote

rings are most likely stuck. add a quart of mystery oil to 5 gallons of gas and then hook it to some machinery and get it working hard and warmed up. work it for a few hrs. need under hard pull to loosen the rings. idling around will do nothing.
 
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PostPosted: Thu Jan 03, 2019 8:28 pm    Post subject: Re: 1939 U engine questions blowing oil Reply to specific post Reply with quote

half a cup of ATF in the cylinders for about a week might be worth trying, the rings must be really stuck to be blowing oil out like that.
 
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PostPosted: Thu Jan 03, 2019 8:29 pm    Post subject: Re: 1939 U engine questions blowing oil Reply to specific post Reply with quote

half a cup of ATF in the cylinders for about a week might be worth trying, the rings must be really stuck to be blowing oil out like that.
 
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Rich'sToys
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PostPosted: Thu Jan 03, 2019 9:13 pm    Post subject: Re: 1939 U engine questions blowing oil Reply to specific post Reply with quote

And that's not surprising if it's actually been sitting that long. I'd try the ATF also.
Otherwise, keep running it and see if it comes out of it. You can always tear it down if nothing else works.
 
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Tully123
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PostPosted: Fri Jan 04, 2019 3:11 am    Post subject: Re: 1939 U engine questions blowing oil Reply to specific post Reply with quote

Thanks for the responses and ideas. In my puttering around with it I had been squinting Marvel mystery oil in the cylinders to soak them. Looking at the
inside of the exhaust manifold shows a lot of old oil caked in there. I don?t know if that is normal or showing that this condition existed before it was
parked.
I will try some ATF in the cylinders and see if that makes any difference.
When we started it we let it run at above idle for at least 30 min. I didn?t hear any knocking or excessive valve noise, I was very happy about that.
I am new to working on tractors. If I need to change them are there ring sets available for this tractor?
I tried to link the start up video if anyone is interested. https://m.youtube.com/watch?v=DcprxwpMtgk
Thanks again.
 
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molinegb
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PostPosted: Fri Jan 04, 2019 6:17 am    Post subject: Re: 1939 U engine questions blowing oil Reply to specific post Reply with quote

Sound like motor worn out Has be reason manifold caked.
 
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Dennis P
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PostPosted: Fri Jan 04, 2019 8:47 am    Post subject: Re: 1939 U engine questions blowing oil Reply to specific post Reply with quote

I have had issues with industrial LP Mazda engines that, having set for a while, the rings would stick & not have enough compression to start. I oil the cylinders to fire it off, let it get hot, shut it off, change oil, & add a quart of Marvel Mystery oil (Rislone works also)to the crankcase. This fixes it & no more issue of rings sticking.
 
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JOCCO
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PostPosted: Fri Jan 04, 2019 12:12 pm    Post subject: Re: 1939 U engine questions blowing oil Reply to specific post Reply with quote

If it sat for 50 years I tend to agree rings stuck. A simple rering and hone the blocks should not be to hard or costly.
 
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Tully123
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PostPosted: Fri Jan 04, 2019 7:21 pm    Post subject: Re: 1939 U engine questions blowing oil Reply to specific post Reply with quote

Thanks again for all of the responses. Any ideas about the best place to get new rings?
I am going to soak the cylinders again and try that first, but want to start looking for replacements if needed.
Thanks
 
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rustred
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PostPosted: Fri Jan 04, 2019 8:06 pm    Post subject: Re: 1939 U engine questions blowing oil Reply to specific post Reply with quote

yep, you will get better results working the heck out of it than just pouring atf in cyl's and hoping. you need the compression to drive the rings outward. mystery oil is an upper cyl. lube and that's what u need.
 
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sms
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PostPosted: Sat Jan 05, 2019 4:38 am    Post subject: Re: 1939 U engine questions blowing oil Reply to specific post Reply with quote

Some years ago I got rings for a U from Agkits.com Also the go to for MM
parts is Welters Farm Supply.
 
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molinegb
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PostPosted: Sat Jan 05, 2019 6:28 am    Post subject: Re: 1939 U engine questions blowing oil Reply to specific post Reply with quote

Rings common. Have NOS pitons (3) guides and intake valves. Might have rings if not can
supply.
 
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Tully123
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PostPosted: Sat Jan 05, 2019 6:36 am    Post subject: Re: 1939 U engine questions blowing oil Reply to specific post Reply with quote

Thanks for all of the responses. I would love to take it out and work it hard, unfortunately winter and tires that will disintegrate if I did anymore that slowly pull it out of the shed are preventing me from doing so.
I will try soaking the cylinders again and running it in place and see if that makes a difference.
Thanks again.
 
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rustred
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PostPosted: Sat Jan 05, 2019 7:30 am    Post subject: Re: 1939 U engine questions blowing oil Reply to specific post Reply with quote

even if you could belt it to something to get it working. also cover the radiator with about a 6" round hole in fan centre. want it to get pretty warm but not boiling. even do a compression check on it. it could have been possible the tractor was never worked hard and its carboned up. also spraying(misting) water into the intake will help loosen the carbon. how's the spark plugs look? black and carbon fouled? plus its possible to that's its just worn out.
 
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