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8N with no power!

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Rob

05-31-2001 19:45:46




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I have a late model 8N. Checking it out,I think there might of been several problems. At first I had fire at the pionts but not at the plugs. Then I had no power at all. I started tracing the power with a meter finally got power back thru the coil to the distibutor but not to the piont. I found the thin bronze jumper was broke and no power was getting thru to the pionts. Now it starts, but has no power at all. It backfires under power back thru the carb. I was going to check the timing, But I haven't used my timing light in years. Every time I tried to hook it up to the tractor, It wouldn't start. Is there a special way to hook up a timing light on a 8N? I found the timing marks on the flywheel, But haven't figured out if I have a problem with my light or I'm in the dark on how to hook it up. The carb was not in good shape so I rebuilt the carb trying to narrow down any possable problems. That made it run a little smoother but still no power. I've replace the pionts, condencer, rotor. Wire and Cap are good. I just replaced them last year. The firing order is 1243, I checked it. But, I did read where people have run the wires the wrong way on the cap. I didn't check this, But I hadn't changed anything from last year. Anyone have any good idea's that might fix my problem?

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Danny in CO

06-01-2001 12:09:29




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 Re: 8N with no power! in reply to Rob , 05-31-2001 19:45:46  
This may be a stupid answer, but...

My 48 8N idles good and doesn't seem to miss when running on just 2 plugs, but it doesn't have any power.

Are you sure all 4 of your plugs are in good shape and firing?

My $.005 worth (not enough for $.02),
Danny



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bg

05-31-2001 20:19:03




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 Re: 8N with no power! in reply to Rob , 05-31-2001 19:45:46  
You can set the timing pretty close without a light. Loosen the distributor clamp to where you roatate the distributor. Start the engine and turn the distributor clockwise until the engine starts to falter, then turn it counterclocwise until it smooths out. Then go on by that point in the CCW direction and bring it back CW to where it smooths out again.

Did you check the centrifugal advance wieghts and plate under the breaker plate? If the pins and plate are worn, the spark cannot advance like it should.
Is this still 6-volt or have you converted to 12?

Did you renew the insulator behind the copper strip in the distributor base?

Beside governor and carburetor, another area that affects power and can cause backfiring is valve adjustment. Weak or broken springs, eroded valve seats, poorly adjusted valves can all be suspect.

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Rob

05-31-2001 20:34:14




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 Re: Re: 8N with no power! in reply to bg, 05-31-2001 20:19:03  
It is still at 6V. I did look at the weights a little but not really that close when I replaced the bronze strap and I did put in the new insulator when I went back together with it. It has had a new rebuild on the engine a few years ago. But, things can go bad early. And the brake are not to tight. :)



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bg

05-31-2001 20:59:25




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 Re: Re: Re: 8N with no power! in reply to Rob, 05-31-2001 20:34:14  
If you haven't adjusted the valves since the rebuild, that is one possibility. I'd check the easy stuff first: fuel, timing, ignition.



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Snowplow

05-31-2001 19:59:05




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 Re: 8N with no power! in reply to Rob , 05-31-2001 19:45:46  
Lots of possible options but we need more info. It sounds like it idles. Does it run at full throttle without moving. Will it go in 1st gear?

You can have a lack of power from poor ignition, but you also could have a fuel flow problem.

Front or side mount dist.?



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Rob

05-31-2001 20:12:54




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 Re: Re: 8N with no power! in reply to Snowplow, 05-31-2001 19:59:05  
It is a side mount dist. Sitting still out of gear, it will rev up to good RPM and not really miss at all. But, put it in gear and just try and drive it on it's own. It was no power or RPM and it pop's back thru the carb.



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Dell (WA)

05-31-2001 22:48:22




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 Re: Re: Re: 8N with no power! in reply to Rob, 05-31-2001 20:12:54  
Rob..... .that a classic "no centrifical advance" problem. Time to check 'em..... Dell



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Kevin CO

06-01-2001 11:07:06




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 Re: Re: Re: Re: 8N with no power! in reply to Dell (WA), 05-31-2001 22:48:22  
How would one go about checking/fixing centrifical advance?

This seems to be a problem I have. I have checked and rechecked timing and point gap. It happened after I did a tuneup and replaced the points and condensor. I put the old ones back, but it didn't help.



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Rob-gotitfixed

06-01-2001 15:23:01




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 Re: Re: Re: Re: Re: 8N with no power! in reply to Kevin CO, 06-01-2001 11:07:06  
"GREAT NEWS" I figured it out and it was SSooo simple that it was stupid. I had read in this forum that someone had found the plug wires wired CW instead of CCW. I hadn't replaced the cap so I didn't check it. To find out my brother-in-law replaced the cap last year right before we put it up for the winter. Thanks for everyone's input. This is one of the best group of people to ask help from that I've seen. Thanks again.

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Zo-Ro

06-01-2001 21:52:23




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 Re: Re: Re: Re: Re: Re: 8N with no power! in reply to Rob-gotitfixed, 06-01-2001 15:23:01  
Ockham's razor cuts again!



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Snowplow

06-01-2001 19:40:10




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 Re: Re: Re: Re: Re: Re: 8N with no power! in reply to Rob-gotitfixed, 06-01-2001 15:23:01  
That will do it! Darn engines are so picky about that!



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bg

06-01-2001 12:13:43




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 Re: Re: Re: Re: Re: 8N with no power! in reply to Kevin CO, 06-01-2001 11:07:06  
When you remove the cap, rotor and breaker plate, there's a small c-clip that holds the weight set on the shaft. Pop it off and slide the weights off. Inspect the pins on the bottom of the weights. if they're worn or ragged, replace them. Also the two-arm plate with diagonal slots:if the slots sides aren't clean and parallel, replace the shaft. It's all one piece. My pins were worn and the slots were worn and the pins were catching and would not advance any farther. The shaft and bushing were also worn and I didn't think it was so bad until I put the new shaft and bushing in. The new was a lot tighter. The biggest challenge is getting the collar at the proper clearance and drilling the holes in the shaft. The rivets originally used are no longer available. If you can't salvage them use roll pins.

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swavo

06-01-2001 12:07:01




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 Re: Re: Re: Re: Re: 8N with no power! in reply to Kevin CO, 06-01-2001 11:07:06  
To check your centrifical advance weights first remove yoiu distributor cap,rotoretc.. ther're hidden under the plate that your points attach to. You should be able to slidethem off the rotor shaft,clean and lubricate,they should move freely.
HTH
Mike



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bg

05-31-2001 20:20:28




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 Re: Re: Re: 8N with no power! in reply to Rob, 05-31-2001 20:12:54  
How's the brake adjustment?



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