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Starting/Running 8N in Cold Weather

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Sal

01-10-2002 07:06:28




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Had some colder weather (15-18 degrees) last week and I took my 51 8N for a ride.

It started up fine. But the engine sounded like the compression was weak. Like always the oil presure was at 42 at 1/3 throttle. I let it run for about 5 minutes before taking it our of the barn. Things seemed to be fine after about 15-20 minutes of driving and a bit of plowing what little snow that was around, the engine sounded like 'it should'.

I was thinking there might have been some water/moisture in the fuel lines?...but I keep the tank full all the time. Could it be that the 3 fuel screens need to be cleaned out? Or did it just need to warm up really good?

Thanks.

-Sal

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Brian *N* S. IL

01-10-2002 10:04:23




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 Re: Starting/Running 8N in Cold Weather in reply to Sal, 01-10-2002 07:06:28  
I think you just needed to let your engine warm up really good. The N engines from what I hear are fairly cold natured (mine is no exception).

You might try richening the mixture a bit (about 1/2 turn on the needle); it helps a lot in the winter on mine. When Spring (warmer weather)rolls around, I lean it back out.



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Mark Hendershot

01-10-2002 08:34:29




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 Re: Starting/Running 8N in Cold Weather in reply to Sal, 01-10-2002 07:06:28  
When I went to a performance carb set up on a VW I owned, the winter cold air when the humidity was just right it would frost up to the point it would have no power at all. If you shut it off it let it set it would go again. I solved the problem by enclosing the carb a little and letting the heat from the exsaust heat the carb some what. Problem sovled and the ice was gone and the linkage did not freeze. Just a thought. Mark H.

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Dave C. (PA)

01-10-2002 08:17:17




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 Re: Starting/Running 8N in Cold Weather in reply to Sal, 01-10-2002 07:06:28  
In the last day or two there was a post about thick oil in the air cleaner causing poor running when the engine is cold. Just one more option...



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Salmoneye

01-10-2002 07:41:04




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 Re: Starting/Running 8N in Cold Weather in reply to Sal, 01-10-2002 07:06:28  
Hmmm...

I went out yesterday and started my 8N and let it idle for about 5 minutes.
I happened to look at the carb and noticed that there was frost all way around where it mates to the manifold.
Maybe you are getting some carb icing like I was...



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Yeah but...carb icing usually refers to icing inside the carb,fyi Rob nm

01-10-2002 10:27:43




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 Re: Re: Starting/Running 8N in Cold Weather in reply to Salmoneye, 01-10-2002 07:41:04  
a



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Salmoneye

01-10-2002 11:00:28




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 Re: Re: Re: Starting/Running 8N in Cold Weather in reply to Yeah but...carb icing usually refers to icing inside the carb,fyi Rob nm, 01-10-2002 10:27:43  
I am well aware of that, but the frost on the outside of the carb is how you 'see' that there is a cold spot inside the carb.

Because it was at idle (actually about 1/3 throttle like Sal), the heat from the manifold was not great enough to overcome the cold spot created by the 'Venturi Effect' in the carb.
This only happens to me around 10-25 degrees with some humidity. Colder and dryer is fine and warmer and wetter is fine too and then again it is only at prolonged idle.

Solution is to shut it down and wait for the carb to externally defrost. Then restart and go about your business at higher throttle, ie. more heat in the manifold.
If I had a 'heat stove' like on the manifold of my CJ Jeeps, I would make sure that I was getting warm air off it to the breather. But we are talking an N tractor here.

If there is enough humidity for frost to be accumulating on the outside of the carb, it is a good bet it is building up on the inside too right where the frost line is...

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Mark Hendershot

01-10-2002 13:42:21




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 Re: Re: Re: Re: Starting/Running 8N in Cold Weather in reply to Salmoneye, 01-10-2002 11:00:28  
Your right the ice forms out side and inside, some times it will freeze right over the jet openings to and not allow fuel to flow. Pilots will tell you that why they have carbruator heaters for flying, you can't pull over and park when it happens. There is a formula for this, right humidity and right tempiture creates dew point freezing problems and the venturie will coat with ice. I don't know the formula but I know it happens, and heat is the only way to stop it. I have seen the frost go all the way to the head area on my VW with the exposed engine and no pre/heat for the air intake. If it becomes a problem just put a reflector on the out side of the carb to hold more heat around it for those days both temp & Humidity are correct for this type of problem. I know a VW is not a tractor but it has a carb and intake manifold and a simple type design and the Baja has the open engine and will have more problems in the winter like this. Mark H.

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I'm sure I get that frost at temps above freezing too. Rob nm

01-10-2002 11:18:32




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 Re: Re: Re: Re: Starting/Running 8N in Cold Weather in reply to Salmoneye, 01-10-2002 11:00:28  
a



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Salmoneye...Could Be...

01-10-2002 11:36:49




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 Re: Re: Re: Re: Re: Starting/Running 8N in Cold Weather in reply to I'm sure I get that frost at temps above freezing too. Rob nm, 01-10-2002 11:18:32  
I was speaking about my particular tractor and my observations on it.

I know that I had a CJ8 (Scrambler) with a 258 and the stock Carter BBD Carb that would ice all the way up to and beyond 40 degrees.
Sucker would start, idle and run fine but within 2 miles would be loping and bucking.
A new tube from the heat stove to breather cured it quickly...



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I get some moisture in the air cleaner bowl. Rob

01-10-2002 13:05:25




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 Re: Re: Re: Re: Re: Re: Starting/Running 8N in Cold Weather in reply to Salmoneye...Could Be..., 01-10-2002 11:36:49  
I don't know how the oil bath removes moisture from the air flow but maybe it does. I can't think of a time I've had a problem that might have been icing. I always figured the moisture was in there because I don't have a gasket on the bottom or top of the air cleaner. I bought some gasket mat'l and I'll makes a couple gaskets soon.



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