Re: 8N

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Posted by Bruce (VA) on October 01, 2023 at 13:36:11 [URL] [DELETE] :

In Reply to: 8N posted by Gordon on October 01, 2023 at 12:54:47:

You need to tell us first if it’s 12v or 6v, with a front or side distributor.

These tractors are amazingly simple machines; they are over 70 years old and were designed to be maintained by the operator.

Some basic troubleshooting skills and a few common tools will get them running. Randomly replacing parts doesn’t get you much.

But…………your friends (and maybe your experience ) will often get in the way of fixing your tractor. Rarely are guesses like "It's the coil" helpful. We can make a long list of possible causes for the tractor not running and start picking our favorite to check out. Or, we can step back and recognize that the trick to fixing these tractors (or trouble shooting any piece of equipment) is to be systematic about it. You need to isolate the problem system by system, step by step and work from most likely to least likely and replace parts only when you confirm they are defective. Jumping ahead to 'so-and-so said it could be whatever' or just replacing parts will waste your time and your money.

It takes three things for an engine to run: spark at the right time, compression, & gas/air in the right mixture. Compression is easy; check it with a gauge. But, you don't lose compression overnight, so if your tractor won't start, or suddenly cuts off, forget about compression for the moment, & concentrate on narrowing the problem to fuel or spark. If you don't do that, you are going to end up chasing your tail around that tractor & spending a boatload of money to fix what could easily be a loose wire or a clogged fuel tank vent. I offer this advice from personal experience because I am not a magician. I do not have the magical ability to simply diagnose the problem & go right to the fix. And I don’t like playing guessing games either. So, whenever my tractors stop, I confirm both spark & fuel then go from there.

I might not be capable of telling you why your tractor isn't running, but I sure can tell you how to figure it out for yourself.

Bottom line: as soon as the tractor stops running, not 5 minutes later, check for spark, fuel and battery voltage.

Does the tractor have a spark that will jump 1/4" in open air?*

Will the gas drain out of the carb bowl in a steady stream and fill a pint jar in less than 2 minutes?

What is the EXACT voltage at the battery? ( yes, you need a multimeter for that, not a worthless light)

How do I know this part is defective?

These are the questions you need answered before you attempt any repairs or buy a new part.

*If you don’t own a spark checker w/ an adjustable gap ( NOT a light) buy one. In the meantime, an old spark plug w/ the gap opened to at least ¼” will work. Ground it to a rust & paint free spot on the engine turn the key on & look for a spark.

Amazon.com: 【The Best Deal】OriGlam Spark Plug Tester, Adjustable Ignition System Coil Tester, Coil-on Plug Ignition Spark Circuit Tester, Autos Diagnostic Test Tool : Automotive


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