39 9N Engine racing

[Lansing9N]

Hey guys - love my tractor.

Now, plowing the driveway this morning in about 12 degrees, blowing snow, etc. At 1/3 throttle, engine would stall with a load. At 2/3 throttle, engine stops running. At 3/3 throttle, engine racing (roar...roar....roar) without a load and then runs well with a load. It's not that I mind plowing at full throttle, but it's a little nerve-wracking and loud...and probably not a long-term solution.

I was thinking about cleaning the carb, but wanted to ask those who know better first.

 

[Jim in Eastern North Caro]

We don't have the opportunity to plow snow here, but just wondering if there was some accumulated ice on the throttle and governor linkages that could cause the settings to go awry. If it doesn't happen in other conditions, it would seem somehow related to the snow blowing into the engine compartment, melting with exposure to heated areas, and then refreezing on cold surfaces.

 

[Bruce (VA)]

You could easily have moisture in the distributor cap.

Get it inside, pull the cap off & use a hair dryer to dry the points/distributor & cap.

If you haven't replaced the gasket in the last 5 years or so, it's time to do that.

But, as Jim said, at those temps, no telling where you've got ice build-up.

75 Tips

 

[Dell (WA)]

Lansing9N.......yer "frosting" yer carbie. The very act of carburetion sucks heat outta the air and in some atmospheric conditions will actually freeze yer carbie. While others say yer weird 4-nipple dizzy is the problem with moisture inside the capple, I say ittchur carbie. Heres a simple "cure". Wrap yer carbie and EXHAUST manifold with ALUMINUM foil (be creative) and you will capture heat and prevent yer carbie from freezing. Simple, eh?

You doubt? Check yer local Piper Cub airplane, its gotta knobbie called carb heat that the pilot pulls on approach fer landing, worst thing in the world to need POWER fer go-around and not have it. .........frosty Dell

 

[souNdguy]

If you have spark at stall, and you probably. Do, if it runs full
throttle fine, then look at fuel. It obviously has air and spark.

 

[Scott PA]

It could be a loose gear on the Governor shaft.

 

[Hobo,NC]

(quoted from post at 05:26:45 02/06/15) It could be a loose gear on the Governor shaft.

It would be EZ to confirm the gov was in control... He mite take a look at that...

I can say from experience when the gov gear comes loose you can not manage the power the engine produces under a load unless you are at full throttle then its all you can do to hang on...

 

[HCooke]

Same engine in a jeep produced 44 HP. That's quite
an increase from an N.

 

[Hobo,NC]

Un-governed = more power...

 

[Bruce (VA)]

And IIRC, same engine produced 40 HP in the 1940 and 41 Ford pickups.

 

[Hobo,NC]

(quoted from post at 19:10:44 02/05/15) Hey guys - love my tractor.

Now, plowing the driveway this morning in about 12 degrees, blowing snow, etc. At 1/3 throttle, engine would stall with a load. At 2/3 throttle, engine stops running. At 3/3 throttle, engine racing (roar...roar....roar) without a load and then runs well with a load. It's not that I mind plowing at full throttle, but it's a little nerve-wracking and loud...and probably not a long-term solution.

I was thinking about cleaning the carb, but wanted to ask those who know better first.

Give the clutch a smoke test but first confirm you have a tad of free play at the clutch rod that enters the transmission housing...

Pedal free play were you put yer foot on the pedal is a mute point and means little free play at the rod on mechanical linkage is what its all about... You need at least 1 1/16" of clearance between the release bearing and clutch cover plate fingers...

set the throttle at 1/2 throttle (I would say full but not sure your gov is operational) put it in high gear and pop the clutch... Does it grab are slip and let the engine run away... If it grabs and stalls the engine its notcher clutch. If it slips and does not load the engine you have a clutch issue even if you have other issues... That's my smoke test,,, If the clutch is bad you usually have only one smoke test in it....

PLAY SAFE

Not being there I would recommend you hook a implement up to it (your scrap blade) so if the clutch is good you Won't flip it over on ya...

 

[Lansing9N]

Thanks everyone for your ideas. I'm going to give them all a try this weekend and see what I see. It still amazes me that I can get a bunch of strangers to offer me advice when I need it.

 

[Lansing9N]

Hello all

Well, I tried the easiest idea first - wrapping the carb and exhaust manifold in aluminum foil - and am pleased to report that it seems to have worked. I plowed the entire drive this morning with no stalling or racing and got good throttle response throughout its range. Thanks again. If this turns out to not work in the longer term, I have a series of ideas to try.

 

[Hobo,NC]

How that got here I dunno... It was spose to go in a different post...