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Smoking Pony Motors

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John Logsdon

11-06-2002 18:33:42




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Seems like many of the pony motors smoke. Was there a particular weakness with these motors or just neglect? My 820 pony smokes bad. Is it always rings that cause the blue smoke?




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J. Logsdon

11-08-2002 16:30:05




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 Re: Smoking Pony Motors in reply to John Logsdon, 11-06-2002 18:33:42  

Thanks for all the posts, they were all helpful. I don't feel so guilty now.



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JD Ol'timer

11-07-2002 10:28:25




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 Re: Smoking Pony Motors in reply to John Logsdon, 11-06-2002 18:33:42  
I probably have one of the few pony motors that doesn't smoke, it never has as long as I've owned it! Makes me wonder if it might be lacking something that should make it smoke! I'll send a nice pic of it if anyone would like to see it..



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Clooney

11-07-2002 03:50:25




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 Re: Smoking Pony Motors in reply to John Logsdon, 11-06-2002 18:33:42  
John, I don't know if the oil burning is a weakness but a lot of them do it.
~It isn't always rings & in a lot of cases is worn valve guides, fuel diluted crankcase oil or oil fumes from the big engine collecting in the pony air cleaner [the big diesel vents into the pony air cleaner]. A plugged pony air cleaner due to the big engine venting blowby into it will allow the pony to suck oil from the crankcase.
~In my opinion one of the big factors in pony wear [& smoking] is gasoline entering the pony crankcase due to not turning the fuel off to the pony when done cranking.
~People also tend to overfill the pony crankcase & that leads to oil foaming & being pulled past the valve guides & rings.
~I have had a few over the years that tend to smoke a little but never really effected the power or starting. As long as it isn’t using great amounts of oil & doesn’t foul the plugs it will probably run for a long time.
~One other factor is the rather weak ignition system in the pony that leads to cold misfires & that can wash the cylinder walls of oil & allow raw oil to be pulled past the rings [without a cylinder firing the rings don’t seal very well] & once the cylinder fills with an oil mixture & starts firing it will smoke like crazy until the oil is burnt out.
~Those pony engines run & idle pretty fast so without a load have a fairly high manifold vacuum at idle & that alone can tend to pull oil past the valve guides & rings, in a lot of cases they will smoke at staring idle but will clear up when under load or as the throttle plate opens at run position.

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Ralph

11-06-2002 21:24:09




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 Re: Smoking Pony Motors in reply to John Logsdon, 11-06-2002 18:33:42  
The first year I overhauled mine, it sat over the summer. When I started it in the fall, it smoked, coughed and was a gutless wonder since I started it with gas left in the tank. When I refilled it with fresh gas, it popped right off, minimal smoke and plenty of power. I also let it warmup untill the thermostat opens. I think gas has a flash point of -50, which means it is sufficiently volatile to take fire at this temperature. Especially with the small tank, most of the volatile material was gone by the end of the summer. Stabil may prevent formation of varnish, but not prevent this vaporization. It not so much a problem of rotten gas, but rather the irregular filling of the tank. If my tractors are going to set for any lengtrh of time I either drain them, or run them dry.

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Ol John T Nordhoff

11-06-2002 19:02:13




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 Re: Smoking Pony Motors in reply to John Logsdon, 11-06-2002 18:33:42  
John, Neglect was a common cause of the chronic smoking problem you describe. Yes, blue smoke is often a sign of worn rings. I believe the major cuases of neglect, besides not enough oil changes, were that the engines were seldom warmed up properly and with that sudden short load and then a rapid shutdown, you develped carbon build up, sticky (non flexing) rings, plus ring wear. Just startign them and not allowing much warm up and then the shut down is hard on any engine. A proper warm up kills 2 birds with one stone, because the exhaust gases warmed the diesels combustion chambers PLUS its better for teh engine and reduces excess carbon build up. Good Luck, Ol John T Nordhoff in Indiana

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Duane(Pa)

11-06-2002 18:48:07




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 Re: Smoking Pony Motors in reply to John Logsdon, 11-06-2002 18:33:42  
Was the rings on mine, about 3/16th inch gap. The rings may be soft but at least you can buy them. If you rebuild your pony, I guarantee you'll take better care of it than anyone before you did.



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F-I-T

11-07-2002 05:24:39




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 Re: Re: Smoking Pony Motors in reply to Duane(Pa), 11-06-2002 18:48:07  
Well said, Duane. Mine had very worn rings, but also the lower oil drain back holes in the heads were plugged solid with goo and sediment. They probably should have been designed a bit larger so the oil would have drained back better. Since the oil is generally cold when it is started, and seldom warmed so it would flow and drain well during the engine run, I would check these holes first before anything else. (just like those old Chevy 235's).

Mine had some valve guide wear, but not enough to worry about, and when I start it now, it doesn't smoke, provided that I ran it out of fuel when last it was run.

Frank-in-Tallahassee
70D // 855

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