8N power issue.

fastx19

New User
All. Thought I would do a tune up on the tractor and made it worse. Have gone through the manuals and guides and I am still not figuring out what I may have wrong.

Here is what I did. Took off the carb and rebuilt it with a kit, making sure to carefully set the float level.
Replaced the spark plugs.

I was very careful to record the number of turns on the carb for any pins I took out.

Here is my problem. It runs just fine however under a load it will run for a bit, then stumble and quit on me. Which to me sounds like I am running out of fuel.

Thoughts?

Thanks.

Eric.
 
The first thing I would do is make sure you got the wires on the correct plug firing order is 1243. easy to get it wrong.
 
Hi Eric,
Sounds like viton tipped float valve
needle is sticking closed.
If so, tapping lightly on the carb
should free it up.
Lots of info in the archives on this.



John
 
Re- read your post.
Running lean can cause stalling when
under load.
It's ok to open your main adjusting
screw. If you open too far, you will see
black exhaust.
Lots of tuning advice in the archives
also.

John
 


What hae you done to check continuous flow of fuel to the carb? How are you putting a load on it?
 
The carburetor needs to be properly adjusted when the engine is up to operating temp ?meaning hot. It takes a few tries and make 1/8-1/4 turns at a time and WAIT til engine speed catches up. It?s your tractor so you can do whatever you want, but I have to ask this. How was it running before you rebuilt the carb? Is the sediment Bulb Valves Stem opened 2 Full Turns when you start it up? Did you remove the brass fuel inlet elbow and clean the screen? Did you use your Essential Manuals as a guide? A stuck float or float needle may cause excess fuel to leak out and you will get the gas in the air intake port so pull rubber hose and see if it is wet. Next, perform the fuel flow test. Remove drain plug, open valve, and observe the flow is about 1 a pint in 2 minutes. It was okay to document the settings before, but you should put to OEM settings when rebuilding to new. Main Adjustment and Idle Air screws are set to 1 turn out. Idle (throttle) initial setting is throttle plate just opening. You need to do this with carb on the bench ?you can?t see the plate when attached to manifold. Idle speed is set to nominal 400 RPM but unless you have a Proofmeter on later 8Ns and up, will have to guess or use an RPM tester.

FORD N-SERIES CARB & ADJUSTMENTS:
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Tim Daley(MI)
 

Hi. Turns out I never replaced the hot leads. So, not out of order as they are specific lengths for each one. However, as I have done stupider things before I will double check.
 

Well, good point. I have not done anything specific to verify the flow of fuel except I have opened up the fuel to see how much comes out under gravity. Quite a bit as it turns out! ;)

How do I test load. I have a 7' road grading blade on the back. Usually, it will pull almost anything, to the point dirt is coming over the top of the blade. Now however, I cannot get even close, and if it even get's 1/4 loaded, it will stall out.

Love this tractor! ;)
 
(quoted from post at 22:01:50 02/02/20)
Well, good point. I have not done anything specific to verify the flow of fuel except I have opened up the fuel to see how much comes out under gravity. Quite a bit as it turns out! ;)

How do I test load. I have a 7' road grading blade on the back. Usually, it will pull almost anything, to the point dirt is coming over the top of the blade. Now however, I cannot get even close, and if it even get's 1/4 loaded, it will stall out.

Love this tractor! ;)

fastx19, yes, given enough time your tank will run dry at a steady drip, however, it will develop no power. It needs a steady stream. Not for just ten seconds though. It needs to flow a pint in 30 seconds and keep flowing.
 
I wanted to take a moment and thank everyone who helped on this. Turns out in the end, I was just a bit too lean on the mixture screw. I mean really, you would think I could have figured it out. Anyways, back up to par.

Here is a pic looking over the front of the tractor down the road I maintain. I have about 1/2 mile or so of road which I have to deal with, and thankfully the county maintains the other 15 miles before I hit blacktop. I work this tractor hard and it has yet to let me down for anything.

Thanks again, Eric and his 1948 Ford 8N.


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Good job getting it sorted out! Bet it
puts a smile on your face when she just
digs in and goes.
Nice picture, thanks for following up.

John
 

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