(800) 853-2651
SHOP NOW

1935 John Deere B smoking alot

N

nashranch

Well-known Member
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
 
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.
 

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.
 
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!
 

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.
 
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
 
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.
 
(quoted from post at 20:41:42 01/22/21) 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!
Click to expand...
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
 
(quoted from post at 13:05:08 01/23/21) You should be around 60psi
Click to expand...
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
 
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.
 


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
 
You must log in or register to reply here.

Similar threads

M
48 B Water flowing directly into crankcase (>2 qts/min)
Replies
16
Views
687
Fixingfarmer
Fixingfarmer
M
New-to-me JD-A and JD-B Repair Tips
Replies
13
Views
751
Fixingfarmer
Fixingfarmer
stevieb49829
Update on a couple of related things
Replies
0
Views
500
stevieb49829
stevieb49829
T
John Deere B Losing Coolant
Replies
4
Views
532
greenmech
greenmech
H
John Deere B Magneto
Replies
6
Views
590
Rich'sToys
R
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top