1940 Farmall H

Anonymous-0 · Jul 7, 2008

I have a 1940 Farmall H and have a couple problems. It seems to send compression through the carburator. It was running bad,(you know sounding like popcorn and no power...) I put new cap,rotor,plugs,wires. It still ran the same. Then I put new points in it and that day it ran like new, but the next day when I went back now it won"t start and is back firing through the carburator, but everything looks correct. I sent the magneto off to get tested do you think thats it?

Randy in NE · Jul 7, 2008

Have you checked your valve settings? I recently bought a Case 300 and it was running really bad. The previous owner had taken the head off and evidently didn't adjust the valves. It must have had one that didn't close all of the way. Once we set the valves it smoothed out and the governor settled down and it ran much better. Are the plug wires on the right plugs?

Anonymous-0 · Jul 7, 2008

I double checked the wires and they were correct but not the valve settings. I've never messed with that. You never know though it could be.

Yugrotcart · Jul 7, 2008

Set the valves, both intake and exhaust at .019 cold.
If you have a mag, you should be using copper stranded plug wires.

Paul

labman98 · Jul 7, 2008

It sounds like an intake valve is not closing all the way. I would double check your clearance and make sure there is no carbon or anything holding them open.

Best of Luck - Matt

Mike Farmer · Jul 7, 2008

I go with sticky intake valve. The fact it ran well at one stage and then ran badly again would suggest a bent valve stem. Although as said just carbon could cause it MTF

ScottyHOMeY · Jul 7, 2008

I second double checkin' the valves, but would suggest you first take a look at the order in which your plug wires are hooked up. 1-3-4-2, clockwise as you look at the outside of the distributor cap. If that's in good order (#1 firing in time--open up your distributor cap while #1 is at the top of the compression stroke to be sure) the valves are your next place to look.

rustyfarmall · Jul 7, 2008

Yes, I think it is the mag. You installed new contact points and it ran good, but then the next day it won't run. What has happened is that you didn't fully tighten the screw that holds the points in place after you set the gap, and since that screw wasn't tight, the points moved, and are no longer set at the correct gap.

ScottyHOMeY · Jul 7, 2008

Rusty makes a good point. There's a trick to settin' points in that they tend to close up as you tighten down the screw to anchor them. Check 'em as you go along, and again when you're done. Where they're at when you're done is what matters.

Anonymous-0 · Jul 8, 2008

Thank you everyone I will start looking into everything. Hopefully I will get it right and let you know...

1940 Farmall H

Anonymous-0

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Randy in NE

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Anonymous-0

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Yugrotcart

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labman98

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Mike Farmer

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rustyfarmall

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Anonymous-0

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