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Rebuilt 8N wont start

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8N AL

05-14-2007 18:52:25




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Thanks for all the advice given on this discussion board it has really helped me in rebuilding my 49N. After I put it back together compression is at least 110 on all 4. I could not get it to even try to start with the starter so I pulled it with a truck and could only get a little pop now and then. Double checked timing and replaced the points,plugs,wires,rotor,cap and ignition switch but it still won't start.I use the Autolite plugs you guys recommend. I haven't replaced the coil because it showed good according to my tester. The resistor also tests good. Could the coil be too weak to start but show ok on the meter? Tests also show the points are opening and closing ok. Also, after reading other posts on this site I'm thinking that maybe my spark isn't as hot as it should be. I have put gas in each cylinder as well as starter fluid but this has not helped either. This tractor has been converted to 12 volts several years ago and before needing the overhaul never failed to run. Thanks for any information you might have for me. I just did't want to spend anymore $ than I needed to. The Mrs. is starting to question my mechanical ability.

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souNdguy

05-15-2007 07:31:03




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 Re: Rebuilt 8N wont start in reply to 8N AL, 05-14-2007 18:52:25  
Dell's right. No test for an ignition coil from a consumer grade VOM..

Soundguy



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Brian Bell

05-14-2007 19:26:14




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 Re: Rebuilt 8N wont start in reply to 8N AL, 05-14-2007 18:52:25  
This is a longshot, but you didn't get any antifreeze/water in one of the intake ports did you? This happened to me on my inframe rebuild and I almost went crazy checking/rechecking stuff. I took the carb off to check/OH it and found piston ring fragments in the intake. When I pulled the manifold completely off I found more ring and a small amount of antifreeze. Dried it out and put 'er back together and it started right up.

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Scott1ky

05-14-2007 19:31:17




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 Re: Rebuilt 8N wont start in reply to Brian Bell, 05-14-2007 19:26:14  
Wowzers. Personally, I'd be more worried about finding fragmets of a piston ring in the intake manifold than the antifreeze. I found that antifreeze will come pouring out of the block if you remove a manifold stud or if one is loose. (Don't ask.. Although there was a funny story that sounded something like my 12 year old nephew holding a finger over the hole to keep the antifreeze from spewing out while I went to look for a replacement stud to put back in the block. )

Thanks,
Scott

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Scott1ky

05-14-2007 19:20:23




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 Re: Rebuilt 8N wont start in reply to 8N AL, 05-14-2007 18:52:25  
Have you checked your timing? 1,2,4,3? Is it getting spark at the plugs? Checked your point gap? You can take the plugs out and set the electrodes on the block and see if they arc to the block and in the correct order. You should get a nice BLUE spark. (I'd do with the the old plugs since you're going to replaced them with Autolite 437's.) Those are great plugs with a hot spark, and will also be necessary if you've flooded your old plugs out by cranking excessively.

How about fuel, is it getting any? Pull the drain plug on your carb and see if you get a nice steady flow of fuel. It could be your carb is gunked up if it's been sitting for awhile. Have you checked your intake/exhaust manifold for leaks? Make sure it's on tight with a new gasket. If it's not getting suction at the carb it won't vaporize the fuel and deliver it to the cylinders. Fuel+spark and in the right order you should have a running engine with those compression numbers.

Rebuilt engines can be VERY hard to get started. Trust me on this one, I know from experience. BUT there's nothing quite like hearing the little flathead crank up and come to life after putting in long hours of work getting her back together.

Hope this helps.
Scott

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Dell (WA)

05-14-2007 19:15:08




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 Re: Rebuilt 8N wont start in reply to 8N AL, 05-14-2007 18:52:25  
AL..... ...you write..... ."I haven't replaced the coil because it showed good according to my tester. The resistor also tests good. Could the coil be too weak to start but show ok on the meter?"..... ..yep, ain't NO ohm-meter tester gonna find a BAD frontmount squarecan ignition coil.

You need to make a "calibrated" sparkie tester from enny old sparkie you have layin'round. Bend the side electrode out for a full 3/16" gap. Clamp the sparkie tester to enny convinent engine bracket. Plug enny sparkie wire to the tester. Now try and start yer engine while watchin' yer calibrated tester for blue-snott sparkies. Wimpy yellowish-orangeish poor excuse of a sparkie ain't gonna start yer engine.

For reference purposes, my eazy starting 6-volt 8N will jump a 3/8" gap.

Change yer sparkies AGAIN. AutoLite 437's are good, gap = 0.025". All yer puttzin'round had FLOODED yer sparkies with INVISIBLE contaminates and them lazy sparkies gonna dribble down the center electrode instead of jumpin' the gap and sparklin' yer engine.

Don't throw yer sparkies away, re-cycle them by letting a HOT RUNNING ENGINE clean them, one-atta-time. And save them for the next time you flood. (and there will be a next time)..... ...Dell, yer self-appointed sparkie-meister

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ZANE

05-14-2007 19:10:09




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 Re: Rebuilt 8N wont start in reply to 8N AL, 05-14-2007 18:52:25  
If it is a side mounted distributor you can see if it is firing by removing the high tension wire from the center of the distribuor cap and holding it close to the block or side of the distributor and turn the engine to see if it jumps at least 3/8 inch gap. You can see if it is bad points by opening the points and with the ignition switch on use a screw driver to short between the two parts of the ignition points. If it sparks and won't when the engine turns it is points.

The front mounted distributor is a lot more prone to the coil going out. Especially if it is getting more than three volts while cranking. It can stand a bit more running because the points never stay closed very long to let heat build up in the coil. If you have a volt meter connect it to the coil wire at the top of the coil and turn the engine by hand and see if the voltage goes from battery voltage to about 3 volts when the points close. If the voltage goes higher when the points are closed it is too much voltage and if there is no change in the voltage it means that either the points are not opening and closing or there is a short circuit in the circuit or that in fact the coil is bad.

Zane

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