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8N warm up

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RandyinWNY

01-23-2004 09:08:16

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Hi fellas. I think I need your expertise on this subject. Let me explain my dilemma. I start up my '52 8N to get it ready to plow the newest snow fall. It starts up right away. It also idles perfectly. It also runs great at full throttle.BUT for the beginning time when plowing snow it bogs down and tries to stall. It will do this most of the time when under a load like pushing with the blade. It does this also with out a load if I let out the clutch just alittle to fast. This will all occur right after I let it warm up at idle for about 30 minutes. I thought the tractor would be warmed up enough after about 30 minutes. Now after bogging down and near stalls under load for about 45 minutes to an hour it will all of a sudden start running great. Now at this point it has GREAT power and can move a 7 foot tall snow pile with no effort. I thought a posting was up a while ago about a winter carb adjustment that will help this(Dell?). Also something maybe about carb icing up? I'm not sure.
Its frustrating, it runs great at idle and top throttle for first hour, but no power under load. Then after 45 minutes to an hour it starts to have perfect power. ANY ideas. There is alot more snow coming. Sorry about the long post. It has great oil pressure. 45psi cold and 35psi hot.
Your 8N Friend....RandyinWNY

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Mike

01-24-2004 21:53:22

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Re: 8N warm up in reply to RandyinWNY, 01-23-2004 09:08:16

Randy,

Just another line of thought, are you sure your tractor is warming up, does it have a thermostat installed in the upper radiator hose. It sounds to me as if the engine and manifold may not be warming enough to atomize the fuel until you've worked some heat into the engine.

You can check for a thermostat by squeezing the upper hose (while the tractor is not running, but the engine is warm) and see if you can feel a hard object about an inch and a half long, it should feel about like it has a metal tube inside the hose. The thermostat should be installed at the bottom of the hose, but can move a bit while being used.

Even if it has a thermostat doesn't mean it necessarily is getting up to operating temp, you can remove the radiator cap before you start the engine and put an oven thermometer into the coolant, then start the tractor and warm it up. The tempature should reach the area of 180 degrees minimum for the engine to run properly. Good luck.

Mike

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Dave OH

01-23-2004 21:35:17

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Re: 8N warm up in reply to RandyinWNY, 01-23-2004 09:08:16

"It does this also without a load if I let the clutch out a little to fast." OK, about the carb icing, but from your quote above I think you may be experiencing the problem with thick fluid in the hydrolic system. Remember there is no heat to speak of from the motor to heat it and it takes a long time for the pump action to heat it in cold weather. My brother-in-law changed from mineral oil to the thinner 134D fluid to help with this problem during the winter. He uses it year round. Does anyone have a way to pre-heat the hydrolic fluid?
Dave OH

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Cap-N-ID

01-23-2004 22:13:58

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Re: Re: 8N warm up in reply to Dave OH, 01-23-2004 21:35:17

Dave, one of those long skinny dip-stick heaters will work - the colder it going to be that night, the sooner you turn it on. I have both my dip-stick heater and the pan heater on a timer which I use if I have to leave the old Gal out in the cold over-night.
--Cap--

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Dave OH

01-23-2004 22:34:12

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Re: Re: Re: 8N warm up in reply to Cap-N-ID, 01-23-2004 22:13:58

Thanks,
Dave OH

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Cap-N-ID

01-23-2004 15:24:30

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Re: 8N warm up in reply to RandyinWNY, 01-23-2004 09:08:16

Randy - Dell's fix for carb ice is quick and easy and works. What you're trying to do is to keep the carb and intake air warm enough to prevent the ice that can form when the liquid gasoline vaporizes in the carb under certain atmospheric conditions. If you try Dell's suggestion and find that it solves your problem you might want to take the time and make a permanent fix. The way to do it is just like we do for recip. engines in aircraft. It's called a "carb heat" system, and what it does is to introduce already heated air, from around the exhaust manifold, into the carb. To make a permanent system try this - Buy what we used to call an "exhaust cut-out" (It's an in-line "Y" valve for directing air flow), rig it in-line in the air inlet tube from your air cleaner just ahead of the carb intake, and connect its' other inlet to a pipe that runs up to some sort of an air pick-up around the exhaust manifold. You can use exhaust "flex pipe" or have your local muffler shop bend up a solid pipe to lead the warm air down to the "cut-out". You can bend up a air pick-up box to fit around the exhaust manifold out of flat sheet stock (pop rivets work well)or have your local furnace installation shop bend one up for you. Easy enough project, and when done you will be able to just flip the lever on the cut-out one way or the other to have either the filtered air so necessary in the summer or the warm air that will prevent carb ice in the winter. Depending on how cold it gets in your area you may or may not want to insulate the "down pipe". It can look quite "factory" if you take your time and do it right. If you can't find a "cut-out" locally they are still available from J.C.Whitney. Item number 245A1628R in the most recent catalog (page 88). or < www.jcw.com > or 1-800-529-4486. Ask any oldtimer about "cut-outs" and you'll hear all about Model A's and Chevy stovebolt 6's, open pipes, all that good stuff we used to do as kids.
Have Fun. --Cap--

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Dell (WA)

01-23-2004 09:23:51

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Re: 8N warm up in reply to RandyinWNY, 01-23-2004 09:08:16

Randy..... ..DON'T MUCK with yer carb. What you are experiencing is CARB ICE. Simple fix. Take some alumninum foil and wrap/shield your carb with the HOT exhaust manifold. Just squeezitt aroung all the parts to capture heat..... ..Dell

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Chris Brown

01-23-2004 17:56:41

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Re: Re: 8N warm up in reply to Dell (WA), 01-23-2004 09:23:51

Dell: We used to have a vac case we used to move snow that would ice up the carb after a half hour or so,heres what fixed it. Grandpa drilled out the weep hole in the exhaust elbow to accept a piece of 1/4" copper tubing ,ran it down to the intake manifold just above the carburator and wrapped it around the manifold a couple times. The lost exhaust never made any noise or caused any problems and it never iced up any more.A little shade tree engineering there.

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