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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

8n backfires

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Michael Va

09-21-2010 12:04:52

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my uncles 8n runs good for about two hours in the hayfield- then starts backfiring

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Dell (WA)

09-22-2010 02:53:51

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 Re: 8n backfires in reply to Michael Va, 09-21-2010 12:04:52  
Mike.......2-hrs of running and then "backfiring" is almost always weak sparkies from yer 4-nipple frontmount squarecan ignition coil. It takes about 1-hr before the internal insulative tar melts and shorts out some windings causing weak sparkies and backfiring. Do I haffta tell you to replace yer uncles squarecan ignition coil???

Caution; there are 2-versions of the squarecan ignition coil. The original 6V-coil and modern 12V-coil. Unfortunately, you can NOT tell the difference by looking at them. You haffta read the lable on the box.

Since yer uncles tractor is a successful 12V conversion with alternator using a 12-to-6V converting resistor. I'd gitt the 6V-coil. Understand? And yes, either squarecan coil needs the "infamous ballast resistor". .......Dell, yer self-appointed sparkie-meister

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09-21-2010 12:27:10

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 Re: 8n backfires in reply to Michael Va, 09-21-2010 12:04:52  
in addition to the info bruce requested.. are there any other symptoms that coincide witht he BF? like hunting throttle.. weakness / loss of hp/

is it really a backfire or an afterfire?


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Michael Va

09-21-2010 12:56:55

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 Re: 8n backfires in reply to soundguy, 09-21-2010 12:27:10  
what is hunting throttle

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09-21-2010 13:00:31

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 Re: 8n backfires in reply to Michael Va, 09-21-2010 12:56:55  
hunting throttle.. ie.. variations in engine speed..

backfire is thru the carb...


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Michael Va

09-21-2010 12:47:12

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 Re: 8n backfires in reply to soundguy, 09-21-2010 12:27:10  
how can i tell the diference of bcackfire or dont have any problems until it been worked hard for 2 or 3 hours...thank yall for your is realy appreciated...

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Bruce (VA)

09-21-2010 12:11:37

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 Re: 8n backfires in reply to Michael Va, 09-21-2010 12:04:52  
To get a more precise answer to that question, we need some more info about the tractor.

When you ask a question here, itís always important to tell us:

1. The model of your tractor (2N, 9N, 8N, NAA, etc).

2. If it is 6v or 12v.

3. If itís an N, if the distributor is on the front or side of the engine.

4. If it has any major parts that are not OEM, such as electronic ignition, an in-line fuel filter, a Zenith carb, an 8v battery, a side coil on a front distributor, etc.

Troubleshooting is different depending on the model of the tractor, voltage, ignition system & distributor placement & the absence of OEM parts.

And, ask your uncle when was the last time he changed the points/plugs/condenser/rotor & cap.

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Michael Va

09-21-2010 12:24:21

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 Re: 8n backfires in reply to Bruce (VA), 09-21-2010 12:11:37  
its an 8n- 12 volt alternater with resister to cut volts to 6volt for the front mount distributor

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