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John Deere Tractors Discussion Forum
:

1935 John Deere B smoking alot

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nashranch

01-22-2021 16:30:07




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This B really blows blue smoke when you goose it. I regret tearing it down further when I had the head off to replace the brass pushrod tubes and head gasket. This tractor sat for at least 10 years the guy said I bought it from. At least that's the story he got from the PO before him. I'm wondering if just the rings are stuck in the pistons. Any body have any luck running Marvel mystery oil mixed with the gas to loosen up rings. Other than that it runs good. I have no way of knowing if it has good or bad compression. Oil pressure is in the medium range on the gage.

The plugs are always black and oily when I check them

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nashranch

01-23-2021 15:24:13




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 Re: 1935 John Deere B smoking alot in reply to nashranch, 01-22-2021 16:30:07  

I probably will pull it apart one of these days and replace that sloppy valve and guide. Also will pull the pistons and probably do a hone and rings. My oil pressure is really good so I'll probably leave the rod bearings alone



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JD39B

01-23-2021 15:11:59




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 Re: 1935 John Deere B smoking alot in reply to nashranch, 01-22-2021 16:30:07  
Is the lower cylinder with the valve guide giving you trouble? With the increase in psi introducing oil your rings are the culprit. You could get by with a hone and new rings if you don't want to go full rebuild. It is all about your use and money. You can also enjoy it the way it is. A ring job may show you oval bores, and the need to go with oversize pistons and bore to .45 or a new block and standard rings. You could leave it alone and rebuild it later. I realized after I decided to keep my B that the full rebuild was for me.

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nashranch

01-23-2021 12:52:45




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 Re: 1935 John Deere B smoking alot in reply to nashranch, 01-22-2021 16:30:07  
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I just squirted a big tablespoon amount of ATF in each cylinder one at a time. I got 40 lbs on the left and 50lbs on the right hand cranking it off course



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nashranch

01-23-2021 07:52:09




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 Re: 1935 John Deere B smoking alot in reply to nashranch, 01-22-2021 16:30:07  
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I have ran this tractor for hours up and down the road. It is then well heated up with still good oil pressure and i have not noticed any blowby from the breather or the clutch area. Also been running straight Ethanol gas in it



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old

01-22-2021 20:55:36




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 Re: 1935 John Deere B smoking alot in reply to nashranch, 01-22-2021 16:30:07  
The 1935 JD B I have had sat and locked up. As soon as my dad told me that I filled the cylinders with oil. It sat that way for 15 plus years. Then when I had the $$ to get it up and running I wicked the oil out and then jacked the front end up about 2 foot. I then filled the cylinder with ATF which works as good as MMO an cost 1/2 of what MMO cost. Let it sit that way a few days and made a wrench that fit in the flywheel holes and tried to spin it over. I about hit my self in the head since it was that easy to spin over. My B does smoke but if it ha ever been rebuilt it would have been back in the 40s or 50s and done by my grand father

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nashranch

01-22-2021 19:59:50




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 Re: 1935 John Deere B smoking alot in reply to nashranch, 01-22-2021 16:30:07  
I just finished up the comp. Tester I made after dinner. Checked compression hand cranking it. Gage said 35 lbs on left cyl. And approx 40 lbs on right cylinder. Kinda low I think but I'm only hand cranking.



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JD39B

01-23-2021 12:05:08




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 Re: 1935 John Deere B smoking alot in reply to nashranch, 01-22-2021 19:59:50  
You should be around 60psi



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Jd39b

01-23-2021 05:39:13




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 Re: 1935 John Deere B smoking alot in reply to nashranch, 01-22-2021 19:59:50  
Thats low. Sqirt some oil in there. I bet it jumps up a bunch. Looks like you are going to have to live with it or do it right with an overhaul.



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nashranch

01-22-2021 19:08:10




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 Re: 1935 John Deere B smoking alot in reply to nashranch, 01-22-2021 16:30:07  
Thanks for your reply JD39b. I forgot to mention when i had the head off i took valves to check the seats. They were all good but i did notice one exhaust valve was sloppy in the guide. Wondering if that's where my oil burning is coming from. I am rigging up a compression tester to test compression. If compression is equal on both cylinders i may pull the head again and replace that valve and guide.

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Jd39b

01-22-2021 19:41:42




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 Re: 1935 John Deere B smoking alot in reply to nashranch, 01-22-2021 19:08:10  
I really don't think that guide would make it smoke like that. Before ripping it apart....start it and run it a bit...say to your bridge and look for smoke coming out behind the belt pulley/clutch area. It may be a whisper of it or there may be a bunch. If there is that is blowby and is saying rings. The worn rings are letting gasses get into the crankcase and since there is no pump they escape through the clutch when the normal venting hrough the breather and intake can't keep up. I have had a few Bs that had that and every time it was rings. Ill judge an engine sometimes more on blowby than exhaust smoke.

One other thing....I borrowed gas from a neighbor once and put it in my Deere H. Ran it all over and it was smoking like crazy. I was worried sick because I wasn't about to rebuild another tractor after the B. Found out that was the gas can that had an entire bottle of seafoam in it! Changed to fresh fuel and no more smoke!

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Jd39b

01-22-2021 18:51:52




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 Re: 1935 John Deere B smoking alot in reply to nashranch, 01-22-2021 16:30:07  
Sounds like it is worn out and sat too long. In the 20 years I have been working on these no amount of snake oil will fix a smoker. I have had the best runners be easy to start and mosquito killers. You can try to work the hell out of it but it will probably not change much.

When you had the head off was the time to check the rings, pistons and cylinder bore. Oversize pistons and rings are a bit hard to find for unstyled tractors. The last B I rebuilt was my 39. It got 100% NOS block pistons and rings. Machine shops couldn't fix the block and mid B pistons are unobtainable at .45 or.90. It wound up being cheaper to go NOS in the end.

It may have crossed your mind...No, late b/50 pistons will not fit in an unstyled with a simple bore. The rods, pins etc are all diffrent....and there is not enough meat in the block to bore it out.

You can leave it as is and deal with the oil or be prepared to lay down 1200 to 1500 in new parts.

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