Re: LOUSY 8N

Posted by oldtanker on June 04, 2021 at 09:57:47 from (66.228.255.203):

In Reply to: LOUSY 8N posted by Vinegar Ben on June 01, 2021 at 12:45:57:

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It's easy to say you haven't diagnosed everything. Not once have you ssaid anything about fuel to the carburetor and or through. You also haven't posted any numbers for compression. You have to have an ignition source, fuel air mixture and compression to make an IC engine run. So you have spark. Great. You say you checked the firing order but never mentioned if you have determined if the #1 wire is going to the #1 cylinder at the right time. I don't care about the generator wiring or if it even works. With a fully charged battery the tractor should start and run if the generator or voltage regulator is dead. But the key to making sure an 8N will start and run is it jumping a gap of about 1/8 an inch with a bright blue spark as a test of the ignition system.

So next if fuel. You cleaned the tank. OK? What about checking for gas to the carburetor? I bought an 8n years ago that wouldn't run. The fuel valve built into the the fuel bowl was packed tight with stuff. No fuel getting to the carb. I've also seen people forget to turn the fuel on. I've seen a lot of carbs on tractors so dirty inside that no fuel gets through them. Easiest way to check that is the plug on the bottom of the fuel bowl. That determines that fuel is in fact getting to the carb. Now you have to determine that the fuel is getting through the carb and into the cylinders. That can be tested by spraying a combustible fluid into the mouth of the carb while cranking. Lot of folks like WD40 for that. A few will use ether but many don't like that on a gas engine. Some will even use a spray bottle with gas in it.

The last is compression. Without good compression it can be hard starting to won't start at all. I'd have to check but I seem to remember 90-125 being in to OK range on the 8N. Some people go to 12 volt to get a weak engine to spin faster to get it to start.

Now that being said. It's getting tuff if not impossible to find good reliable voltage regulators for older IC engines. Same is true with points and condensers. My last 8N I put in what most consider to be top of the line points in only to have the points not line up by half the width of the contacts new out of the box. Those were Blue Streak. I'd already gotten rid of the probmatic voltage regulator by going to 12 volt and an alternator. So at that point I went to electronic ignition.

Now sir, about your attitude. You are asking for help here. OK some folks haven't been gracious with their replies. But neither have you. I'm willing to do a bit of typing help if I can but when you fail to respond to specific questions or get mad because we ask for further clarification it gets to the point where people will refuse to help. Yep, just checked my meter.......you have almost pegged it at this point.

Rick

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