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Help with 8N and starting


 
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dfores86
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Joined: 06 May 2021
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PostPosted: Thu May 06, 2021 5:36 pm    Post subject: Help with 8N and starting Reply to specific post Reply with quote

I have searched the forums and it may be due to me not being able to read, but I have not encountered something similar to what I am experiencing.

In short, we can pull start this 8N and within 20-30 ft it is running, while the engine is still hot it will fire back up on its own. It runs smooth and sounds solid.

Things done so far:
Rebuilt Carb
changed wires and plugs
gap has been checked and rechecked

I've reviewed 75 8N tips and other documentation from this site, just looking for some guidance.

Thanks!
 
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Royse
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Joined: 17 Jan 2011
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Location: Ionia County Michigan

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PostPosted: Thu May 06, 2021 6:41 pm    Post subject: Re: Help with 8N and starting Reply to specific post Reply with quote

Welcome to the forum.
I would do a compression test to start with.
 
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RM-MN
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PostPosted: Fri May 07, 2021 3:06 am    Post subject: Re: Help with 8N and starting Reply to specific post Reply with quote

A weak battery and a starter that is worn can cause that. The worn starter draws more current so the weak battery's voltage drops. Now there may not be sufficient voltage to fire the spark plugs.
 
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rvirgil_KS
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Joined: 07 Jul 2007
Posts: 1993
Location: Northwest Kansas

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PostPosted: Fri May 07, 2021 6:50 am    Post subject: Re: Help with 8N and starting Reply to specific post Reply with quote

6 or 12 Volt? Front or side mount distributor?

If it has a 12 volt conversion, check for too much resistance in the coil input circuit.
 
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jimtrs
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Location: Sandown, NH

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PostPosted: Fri May 07, 2021 8:04 am    Post subject: Re: Help with 8N and starting Reply to specific post Reply with quote

CVPost-dfores86 wrote:
(quoted from post at 21:36:20 05/06/21) ..... we can pull start this 8N and within 20-30 ft it is running, while the engine is still hot it will fire back up on its own

I'm guessing that your tractor doesn't start conventionally when cold.
If that's the case, A worn out engine (low compression), or compromised ignition system are two common reasons for no start unless pulled. Engines turn over nice and fast when pulled. Loosening up, building compression and continuous turning over are some of the reasons they start this way. Some or all of those reasons can overcome why they don't start on their own. These are also some of the reasons why tractors start easier on 12 volts.

Royse and RM are telling ways to check some of this.

If it's low compression, the next step is to determine why it's low.
 
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dfores86
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PostPosted: Fri May 07, 2021 5:00 pm    Post subject: Re: Help with 8N and starting Reply to specific post Reply with quote

This is all great stuff, thank you very much!

It was converted to 12 volt, what is too much resistance in the coil input circuit? This is a front mount distributor.

I am in the process of acquiring a compression test kit with a 90 degree elbow.

Thank you guys!























 
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M-MAN
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PostPosted: Sat May 08, 2021 3:24 am    Post subject: Re: Help with 8N and starting Reply to specific post Reply with quote

Is this tractor new to you? You mentioned new plugs and wires but what about the points and condenser? Have you checked the timing? Does it have a ballast resistor or a ( 12v no external resistor needed) coil? Coil resistance should be around 1 1/2 ohms with a resistor and 3 without. Valve lash? Vacuum loss? (Spray brake cleaner around carb and manifold and listen for speed change). Breather clean?

My first thoughts were a very tired engine but you have other issues. Even a tired engine would fire up within five feet when pulled.
 
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Royse
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Location: Ionia County Michigan

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PostPosted: Sun May 09, 2021 4:54 pm    Post subject: Re: Help with 8N and starting Reply to specific post Reply with quote

K. Larues' diagrams are good but I find JMOR's easier to read.
He has many, so if this isn't the one you need, Google them.

I understand and appreciate the sentimental value.
The fact that it was set up makes me want to double down on the compression check.


 
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dfores86
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PostPosted: Sun May 09, 2021 5:51 pm    Post subject: Re: Help with 8N and starting Reply to specific post Reply with quote


This is great thank you! I am ordering a compression tester now, I am hoping to find a 90 degree elbow for it so I do not have to take the hood off.
 
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dfores86
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PostPosted: Mon May 10, 2021 11:01 am    Post subject: Re: Help with 8N and starting Reply to specific post Reply with quote

Also, I just realized there was a 8n forum, sorry about posting in the wrong place.

I am waiting for a compression kit to arrive, I did skip over and confirm the wiring diagram, I did not get to test the resistor as my grandfather needed help.

So while there I checking the wiring, I grabbed a test light to verify power to the coil/dist and the damn thing fired up. Keep in mind, the last time it ran was when I initially posted, and the fuel is turned off. I guess I should let it run until it is empty.
 
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dfores86
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PostPosted: Sat May 22, 2021 5:57 pm    Post subject: Re: Help with 8N and starting Reply to specific post Reply with quote


all cylinders have around 100psi, what next?
 
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dfores86
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PostPosted: Sun May 23, 2021 2:18 am    Post subject: Re: Help with 8N and starting Reply to specific post Reply with quote


I ordered a new fuel line, bowl and carb elbow strainer. The current fuel line dips above the fuel bowl, and at some point was fixed with a rubber bridge just before the carb elbow.
 
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