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8N will not start

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Jim (Automation

07-30-2007 19:06:06

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Originally had a no spark issue on my 48 8N. Fuel didn't seem to be an issue in the beginning. I had voltage at the coil, but no spark. I decided that I would give the ignition a complete work over - new coil, dist cap, plugs, cap, points, and wires. I gapped to .015 and tested for spark - nice and hot. Wires double checked to make sure they were going to the correct cylinders. The tractor ran fine before the ignition went south. Fuel valve was on and no start. I made sure I had fuel at the carb. I removed the carb and did a quick clean up - no obvious problems. Reinstalled the carb and still no start. Ether does not help either. I need to try removing a plug and place a small amount of fuel in the cylinder to see if I can get some sort of combustion. The only other thing I can thnk of doing is to remove the air filter assembly and see if it will run. The air filter was cleaned and serviced last month and the tractor has not been used much since then.
Any ideas.....

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Jim (Automation Man)

07-31-2007 18:42:43

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Re: 8N will not start in reply to Jim (Automation Man), 07-30-2007 19:06:06

I"ll try to hit all of the questions: I am using Autolite spark plugs and copper core wires. I observed the good spark using one of the Autolite plugs grounded to the engine. I did not remove the distributor when I replace the ignition parts. The rotor was installed with the flat area matching the distributor. I was applying the ether through the air intake. I do plan on taking the intake pipe off of the carb and applying the ether there to see if it makes any difference - I did see a puff of smoke coming from the exhaust - I thought, but nothing I would consider real combustion. I"ll check the wires again using #1 as the front cylinder, just to make sure it is right. I"ll update you tomorrow. Thanks for the tips.

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souNdguy

07-31-2007 06:09:28

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Re: 8N will not start in reply to Jim (Automation Man), 07-30-2007 19:06:06

I agree with Dan... If you can't get it to hit a lick on starter fluid.. then you DO NOT have good spark... or you have no compression/vacume.

Question.. how were you administering the starter fluid? You do know the best way to do that is to feed it right into the mouth of the carb with the breather pipe off right?

That way you can rule out breathing problems too..

Soundguy

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PeP

07-31-2007 12:54:25

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Re: 8N will not start in reply to souNdguy, 07-31-2007 06:09:28

a trick I used until I got mine overhauled to get the compression up--I drilled a .25 inch hole in the breather tube to shoot in the starting fluid--and I had a hi-temp rubber band that slid over and covered the hole when I ran it.I should have overhauled it years ago as it starts great every time now!--the other problem I had was the flat insulation piece on the brass stud inside the distributor was cracked and when that shorted to ground it was like someone turned off the inigition switch!--PeP

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souNdguy

07-31-2007 12:59:29

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Re: 8N will not start in reply to PeP, 07-31-2007 12:54:25

I've seen others that drille dtheir pipe. i seen one guy that had some sort of sheet metal screw in his.. etc. Same thing as you did.. but yours don't require tools.

Clever bandaid fix!

Soundguy

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BillM (OH)

07-30-2007 21:03:32

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Re: 8N will not start in reply to Jim (Automation Man), 07-30-2007 19:06:06

If you have a snappy blue spark at a test spark plug (gapped at 3/16ths or so) grounded to the block, you probably need to change out your plugs to Autolite 437's - once you flood your plugs (likely when cranking a no start), they don't want to work anymore.

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Dan

07-30-2007 19:12:06

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Re: 8N will not start in reply to Jim (Automation Man), 07-30-2007 19:06:06

If it will not start on starting fluid - your problem is with the ignition system. You sure you put the distributor back on correctly?

Dan

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A. Bohmeian

07-31-2007 10:18:37

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Standing Near the Door, he asked... in reply to Dan, 07-30-2007 19:12:06

Quote: ''Wires double checked to make sure they were going to the correct cylinders.''

1-2-4-3 with number one being at the FRONT, right? You must also check the distributor, as Dan says, to make sure you know which post is number one on that end, and that the rotor is pointing at it when number one cylinder is near TDC on the compression stroke.

Sorry to come back to something you've already addressed, but you didn't provide the essential information to reassure us you had correctly checked the firing order; and the way you describe it, it sure sounds like a firing order problem.

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Jim (Auomation Man)

08-02-2007 19:39:34

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Re: 8N will not start in reply to A. Bohmeian, 07-31-2007 10:18:37

I did a little more checking today.
I triple checked my wires first thing and found the wires to be correctly install with #1 being in front. I turned the engine over to check for TDC and the rotor firing on #1 - it seemed to be good. When I grounded an Autolite plug to the engine and cranked it over, I had some fire, but I'm not sure if it was strong enough. I tried some gas directly in the cylinder to see if I could get some sort of fire - nothing. I checked the compression on my cylinders and found this 1- 50lbs, 2-55lbs, 3-60lbs, 4-5lbs. Yes, five lbs. Do you know what normal compression shuld be on these engines? With all of the cranking, I never saw a wet plug, but I had loads of gas in the carb. Thoughts?

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