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2n lopes under load

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Mike H

09-17-2000 18:55:37




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Just got a 2n Sat and have been playing around with it all weekend. My son-in-law (who works at his fathers tractor dealership) told me that they had taken an old ford in as a trade and thought I might be interested. He doesn't do any work on fords but said it had new tires and everything seemed to work but the generator. I decided to buy it without seeing it first and I'm not disappointed. The generator problem turned out to be reversed battery connections ( hope the previous owner didn't trade because of that) anyway after changing all the fluids I put the bushhog on and starting mowing, things went well for a round or so, then when underload the engine would seem to almost die then rev, pulling out and playing with the choke would keep it running and backing the throttle to about 3/4 and it would smooth out and run as long as I didn't give it more throttle. I am going to change the points, condenser,coil, plug wires, distributor cap, and plugs because it doesn't appear to have been done in recent history. I noticed the copper fuel line had been spliced with about 8 inches of rubber hose with a little kink in it that I'm going to replace. This thing also has a vertical exhaust that is installed curve forward putting it about 2" from the carb and fuel line. Don't know if that would have any effect but it seems that for safetys sake the exhaust shouldn't be directly under the carb. Sorry this is so long but it is hard not to talk when you've got a new toy. If anyone knows what would cause this ( or better what would fix this), I'd appreciate hearing from you. Thanks Mike H *9N2I5703*

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Nolan

09-18-2000 05:38:54




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 Re: 2n lopes under load in reply to Mike H, 09-17-2000 18:55:37  
Loping like that is often caused by lean mixtures. Lean your lawnmower out and you'll see what I mean.



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Ed Gooding (VA)

09-18-2000 02:37:11




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 Re: 2n lopes under load in reply to Mike H, 09-17-2000 18:55:37  
Hi Mike: This suggestion won't help your power problem, but I'd suggest replacing that copper fuel line with a steel one ASAP, especially with your exhaust setup. You've got a tractor fire waiting to happen.

You can scan the archives here on "copper fuel line" to see past discussions on this for the details.

Best of luck with your new N..... ...Ed
'52 8N475798



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Dell (WA)

09-17-2000 21:03:46




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 Re: 2n lopes under load in reply to Mike H, 09-17-2000 18:55:37  
Mike..... .hope you N-joy your new toy...er...tractor. They are neat but have their quirks and ferbiles. BUT the parts are relatively inexpensive and eazy to find, besides all those neat 3-point implements to ponder over.

From your description of 1 round of brushoggin and then you start to have engine running problems sounds like the frontmount ignition coil going bad on you. Unfortunately, they are not as robust as they could be. Its a time/heat related problem of about 1/2 hr or so to heat up the coil and melt the insulative tar and start to short out the turns and reduce the sparkies. Since you say you are going to replace the coil, you will probably solve your problems.

The other serging/loping suspect could be the governor but I tend to discount that at this time because the governor problem should show up almost after start up and you claim a round of 'hoggin' before you start having problems.

Re....Brushoggin...I hope you have an Over Running Coupler (ORC) on your 2N's PTO shaft. This is a 1-way rattaching device that prevents all that rotory energy in the hog from backfeeding into the tranny and causing your tractor to NOT SLOWDOWN when you clutch to slow for the corner of the barn, fencepost, irrigation ditch, creekbank, wifes car (don't ask). The ORC also prevents expensive tranny noises. $60 cheep, get one..... ...Dell, the self-appointed ORC safety preacher

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Fred OH

09-17-2000 22:38:47




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 Re: Re: 2n lopes under load in reply to Dell (WA), 09-17-2000 21:03:46  
Dell, he pulled out the choke and made it run! That's fuel related, isn't it? Go back and read the post again and tell him to clean fuel line and carburator and maybe tweak the jet. L8R----Fred



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naw.....Dell (WA)

09-17-2000 23:32:01




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 Re: Re: Re: 2n lopes under load in reply to Fred OH, 09-17-2000 22:38:47  
Fred..... .Your observation and recommendations to check all 3 fuel line filters have great merit and I would definately 2nd your suggestion that the fuel line be pulled off at the carb elbow (which is the 3rd secret fuel filter) and see if the gas flows from the line or if it piddles....

Howsomever, most clogged fuel filter symptoms generally occur in the 1st 5 to 15 min of engine running and require a 15 to 30 minute wait to refill the carb float chamber before the tractor can be restarted. As stated, the engine never dies, it just doesn't want to take a load. Insufficient sparkies????

My diagnosis included considering the effect of enriching the fuel mixture by the choke when the sparkies are loosing their spark. It is known that a richer fuel mixture (up to a point), is eazier to burn (less spark voltage required) than a lean mixture (which is why you need to choke a cold engine to start it). This is why, along with the apparent time delay, I suggested that the frontmount ignition coil (known cause of weak sparkies) be replaced..... ..Dell

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naw.....Dell (WA)

09-17-2000 23:29:59




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 Re: Re: Re: 2n lopes under load in reply to Fred OH, 09-17-2000 22:38:47  
Fred..... .Your observation and recommendations to check all 3 fuel line filters have great merit and I would definately 2nd your suggestion that the fuel line be pulled off at the carb elbow (which is the 3rd secret fuel filter) and see if the gas flows from the line or if it piddles....

Howsomever, most clogged fuel filter symptoms generally occur in the 1st 5 to 15 min of engine running and require a 15 to 30 minute wait to refill the carb float chamber before the tractor can be restarted. As stated, the engine never dies, it just doesn't want to take a load. Insufficient sparkies????

My diagnosis included considering the effect of enriching the fuel mixture by the choke when the sparkies are loosing their spark. It is known that a richer fuel mixture (up to a point), is eazier to burn (less spark voltage required) than a lean mixture (which is why you need to choke a cold engine to start it). This is why, along with the apparent time delay, I suggested that the frontmount ignition coil (known cause of weak sparkies) be replaced..... ..Dell

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Fred OH

09-18-2000 07:31:11




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 Re: Re: Re: Re: 2n lopes under load in reply to naw.....Dell (WA), 09-17-2000 23:29:59  
Well Dell, if he wasn't "shotgunnin" (putting on six parts to correct one), maybe we'd find out what the culprit is, huh? L8R----Fred OH



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yep.....Dell (WA)

09-18-2000 07:37:38




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 Re: Re: Re: Re: Re: 2n lopes under load in reply to Fred OH, 09-18-2000 07:31:11  
Fred..... well, a tuneup is always a good place to start from..... Dell



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Fred OH

09-18-2000 07:29:12




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 Re: Re: Re: Re: 2n lopes under load in reply to naw.....Dell (WA), 09-17-2000 23:29:59  
Well Dell, if he wasn't "shotgunnin" (putting on six parts to correct one), maybe we'd find out what the culprit is, huh? L8R----Fred OH



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hartshorn

09-18-2000 14:43:56




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 Re: Re: Re: Re: Re: 2n lopes under load in reply to Fred OH, 09-18-2000 07:29:12  
if the parts are more than 4 years old he will see improvements by replacing all old electrical parts...any one particular one may not cause his particular loping problem (i agree with dell that it is prolly the coil) but points cap wires plugs each will increase performance. Once you do the tuneup and get everything new it's much easier to do one at a time troubleshoot.

more than once i have replaced one electrical component at a time and ended up replacing them all :-)

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