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Cold starting


 
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Tony292
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Joined: 28 Jul 2017
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PostPosted: Thu Feb 22, 2018 5:45 pm    Post subject: Cold starting Reply to specific post Reply with quote

So this is my first winter with an N tractor, 1942 2N to be exact. I’m a total gear head but a newbie in the tractor world. Bought the 2N last summer and it ran ok. I’m the 3rd owner. The 2nd owner had it for 5 years and he “rebuilt the carb and ignition” but it wouldn’t stay running without having the choke halfway engaged! Knew it had a problem at that point!

So I tinkered with it in the fall and the carb was leaking so I replaced it with an eBay carb. Started great until it got cold. When below 35 it just wouldn’t start. I would have to crank and crank until just about dead and if lucky it would barely start. I noticed that from day 1 it seems to crank slow. But that didn’t stop it from starting in summer and fall weather. i Replaced the battery when the one in it completely died this fall. Doing so didn’t help cranking speed. So I replaced the starter and wow!! It cranks so much faster now!


So in the last month I tinkered some more with the carb and bought a magnetic stick on block heater. Using that it fires up into the 20s. Hasn’t been colder than that yet but it starts so much easier that I think it would start down into the single digits. It starts in cold weather so much easier. I fired her up today and did some snowplowing. She fired up in about 30 seconds at 25 degrees! I just love how simple these tractors are!
 
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Bruce (VA)
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Location: Old Church VA

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PostPosted: Thu Feb 22, 2018 5:51 pm    Post subject: Re: Cold starting Reply to specific post Reply with quote

Glad to hear you got it running. Were the
carb and starter OEM parts?
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Tony292
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PostPosted: Thu Feb 22, 2018 6:09 pm    Post subject: Re: Cold starting Reply to specific post Reply with quote


Carb wasn’t. Starter was new from this site. I would recommend to anyone having cold start issues to take a look at cranking speed! It won’t matter how spot on your spark or carb are, if it’s cranking too slow (like mine), it will struggle to start. Especially when you take into account that it’s an engine that started life at 6.5 to 1 compression, and 75 years later how much compression is left assuming it isn’t been rebuilt? So cranking speed becomes critical.
 
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Tall T
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Joined: 26 May 2014
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Location: Salt Spring Island

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PostPosted: Thu Feb 22, 2018 6:48 pm    Post subject: Re: Cold starting Reply to specific post Reply with quote

Tony292 wrote:
(quoted from post at 19:09:13 02/22/1Cool
Carb wasn’t. Starter was new from this site. I would recommend to anyone having cold start issues to take a look at cranking speed! It won’t matter how spot on your spark or carb are, if it’s cranking too slow (like mine), it will struggle to start. Especially when you take into account that it’s an engine that started life at 6.5 to 1 compression, and 75 years later how much compression is left assuming it isn’t been rebuilt? So cranking speed becomes critical.


A simple indicator of compression is how abruptly, or not, the engine stops cycling after the key is turned off. The added momentum of the heavy flywheel in my tractor is a factor, but by comparison my 235 GM just snaps to a stop after a couple of rotations when I turn it off -- only 22,000 miles on that engine.
 
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Bruce (VA)
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PostPosted: Thu Feb 22, 2018 6:55 pm    Post subject: Re: Cold starting Reply to specific post Reply with quote

I should have clarified that I was asking about the old parts that you replaced. I?ve been working on old cars, trucks & tractors now for over 50 years. Whenever possible, I get OEM component parts rebuilt.
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Tony292
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PostPosted: Thu Feb 22, 2018 7:34 pm    Post subject: Re: Cold starting Reply to specific post Reply with quote


Old carb was M/S. Old starter looked original but no way to tell.
 
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Ultradog MN
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Joined: 22 Apr 2001
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Location: Twin Cities

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PostPosted: Fri Feb 23, 2018 4:34 am    Post subject: Re: Cold starting Reply to specific post Reply with quote

This doesn't address your post as much
as it falls in the "Oh, by the way
category".
I plug mine in before I start it in
winter. Rarely do I need to start it at
a moment's notice so a couple of hours
on the block heater does wonders.
I've gotten so I feel a bit guilty
doing icy cold starts on the poor
thing.
My pickup is worth several times what
this old tractor is worth yet I'll
think nothing of turning the key on a
-20 morning.
But my junky old tractor gets plugged
in below about 30. Maybe I'm becoming a
softie.
 
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Pete in Holland MI
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PostPosted: Sat Feb 24, 2018 7:59 am    Post subject: Re: Cold starting Reply to specific post Reply with quote

Cranking speed isn't that critical. Look at all the hand crank engines out there.

You say you are happy it'll start after 30 seconds of cranking? Many, but not all, 6 volt tractors develop voltage losses as
they age and develop rust between all the metal joints. When this happens, a lot of current goes to the starter, and starves
the ignition system.

Know how to jump start a 6 volt tractor with a 12? Try that on a cold morning. If the tractor lights right up, my guess is
that it is because you had a hotter spark.

Had similar issues with my dad's Jubilee and after the test above, decided to convert to 12 volt. Now, at 10F below zero, pretty
much tap the starter and it lights right up, as there is more voltage available to the ignition system for a hot spark.
 
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Royse
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Location: Ionia County Michigan

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PostPosted: Sat Feb 24, 2018 3:07 pm    Post subject: Re: Cold starting Reply to specific post Reply with quote

"Old carb was M/S."

Want to get rid of it?
Glad to hear you have the tractor up and running.
 
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