International Farmall 656

Anonymous-0 · Sep 30, 2009

I have a 1974 Farmall 656 that won't run smooth unless the choke is out at least half to three quarters. I have replaced the usual, i.e., carb kit, dist. cap, wires, points, plugs, rotor and fuel shut off solenoid to no avail. Next step, I guess, is to check compression. Also noticed the carb tends to form frost as if it wants to ice up. Anyone have any suggestions it would be appreciated.

keh · Sep 30, 2009

I had a JD 2010 that had similar symptoms with choke and it turned out to be a bad switch.

KEH

LEH · Sep 30, 2009

Could be electrical like KEH says, but I think you still have a blocked jet in the carb. OR a vacume leak. Frost isn't unusual in cold weather, my Oliver 88 used to frost up until the engine was warm.

cjd12000 · Sep 30, 2009

when my 706 does this the sediment bowl is usually got some debri stuck in it and i have to have some one hold there finger on the bottom of the gas tank well I take it apart and clean it out. the stream coming out has to be pretty heavy as they can use more gas than most of us would like.

relaurain · Sep 30, 2009

It"s needing a richer mixture if you need the choke closed to run. Look for a vacuum leak or improper "lean" carb settings. Could be a clogged jet also.

Allan in NE · Sep 30, 2009

Like cjd says, if you've gotta have the choke out to keep it running, it's starving for fuel; plain and simple, end of story.

They have a real nasty habit of plugging with rust/junk at the little standpipe up inside the tank above the sediment bowl.

I have a tractor that I fought this problem with until I took the gas cap off and gave 'er a shot of air backwards up thru the fuel line. Hasn't given a problem for over a year now.

Allan

Allan in NE · Sep 30, 2009

Like cjd says, if you've gotta have the choke out to keep it running, it's starving for fuel; plain and simple, end of story.

They have a real nasty habit of plugging with rust/junk at the little standpipe up inside the tank above the sediment bowl.

I have a tractor that I fought this problem with until I took the gas cap off and gave 'er a shot of air backwards up thru the fuel line. Hasn't given a problem for over a year now.

Allan

CWL · Sep 30, 2009

Allan, I did the exact same thing on my WD over two years ago. Still going strong.

Owen Aaland · Sep 30, 2009

Allan, I'll agree that it is true about 99 percent of the time. It is however, possible that under the right conditions a weak spark can also act like this.

A rich mixture ignites easier so that an engine may run better with some choke if it has poor spark, but I would expect to find that it would be hard to keep it running as the load on the engine changes.

wolfman · Sep 30, 2009

9 chances in 10 it is a bad manifold gasket letting in air. My 656 did as yours and by dumb luck I sprayed a fine mist of starting fluid or WD-40 around the manifold and it smoothed out. Someone sometime likely tried to use starting fluid on the tractor and those gasers will get manifold gasket problems as a result.

Iowa Jim · Sep 30, 2009

Did you replace the coil? I had the same issue with our IH 756, the issue was fixed when we replaced the plugs, points, condenser, and coil. We also thought it was a fuel issue, but it wasn't.

Jim

Anonymous-0 · Oct 1, 2009

Thanks. That makes sense. I will try the ether trick. Other that doing this, I guess there is no way to measure the vacuum pressure. I have had the fuel bowl off to clean it and after replacing it and opening the shutoff valve, there appears to be plenty of gas flow, but I will also check the inside of the tank for any obstruction. Thanks to everyone for their suggestions.

Anonymous-0 · Oct 1, 2009

No. I did everything else but not the coil. I am going to check for vacuum leaks around the manifold first and if that looks good, then I will replace the coil. Thanks for the suggestion.

International Farmall 656

Anonymous-0

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keh

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LEH

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cjd12000

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relaurain

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Allan in NE

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Allan in NE

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CWL

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Owen Aaland

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Iowa Jim

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