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Farmall & IHC Tractors Discussion Forum
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Farmall H Running Problems

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Andy Motteberg

11-09-2007 13:29:38




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Hi,
I posted a while back about my 1943 Farmall H not running right. When you rev up the engine, most of the time it will shut off, but if you quickly push it back down, it runs ok. The tractor has a IHC H4 Magneto. The mag has new points, condenser, cap & rotor, the tractor has new D21 Champion plugs and new NAPA MAX POWER plug wires. The carb is cleaned and new kit put in, new fuel filter, there is gas in the carb and we did adjust it. A few days ago, me and my Dad were going to get some wood from our neighbor's for winter, we use the tractors because we need to drive deep into the woods. I thought maybe my Farmall H would work, but it does not have the power to pull our empty trailer. We got it onto the road and my Dad got it into 5th with the throttle way up and it had a hard time pulling it and it was missing on a cylinder! We drove it back slowly and put the trailer on my Dad's 1954 Super M-TA instead and it worked very well. My H seems like it runs on all four cylinders when it is not pulling anything, but it is missing when we pull. It starts pretty hard and only starts with the throttle all the way down. Yesterday, I let the tractor warm up while it was sitting and I pulled one of the plug wires off one at a time. The tractor ran quite a bit different when each one was pulled off, except one only changed the running a little bit. I held each wire close to the end of the plug to see if they would spark and all the wires are putting out nice blue spark. I was told on here that I should do a compression test, have not done that yet because I cannot find my compression gauge. My Dad told me that one of the valves might be sticking. What do you think I should do? If I cannot get this fixed, I'm going to take the tractor to Gary Jensen Repair and let him fix it. My Dad says it is getting the gas fine, so I don't think it is a carb problem, but I'm not sure.

Thanks,
Andy.

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Willie R Adkins

11-14-2007 16:03:53




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 Re: Farmall H Running Problems in reply to Andy Motteberg, 11-09-2007 13:29:38  
your governor could be out of adjustment or your air cleaner pipe clogged or exhaust pipe clogged
good luck



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a_lead

11-10-2007 04:51:50




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 Re: Farmall H Running Problems in reply to Andy Motteberg, 11-09-2007 13:29:38  
You mentioned in your comments that it has a new fuel filter. Not sure if anybody else noticed or not. Best of my memory from other posts on this site (and my own) that it is a gravity flow system, and any kind of inline fuel filter just won't let enough fuel through.



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Andy Motteberg

11-10-2007 09:53:41




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 Re: Farmall H Running Problems in reply to a_lead, 11-10-2007 04:51:50  
It is not an in line filter, when I said new fuel filter, I meant the "Sediment bowl" with the shut off and filter screen. There is plenty of fuel in the carb when I open the petcock.



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El Toro

11-09-2007 17:07:37




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 Re: Farmall H Running Problems in reply to Andy Motteberg, 11-09-2007 13:29:38  
Since you have hot fire to the plugs I would try a different brand. Are you sure you have the main jet adjusting screw opened enough? That enriches your fuel mixture. If that doesn't help I would bring No1 piston to TDC on the compression stroke and see where that rotor is pointing. It should at the No1 plug tower, may be off a tooth. Hal



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Andy Motteberg

11-09-2007 17:19:08




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 Re: Farmall H Running Problems in reply to El Toro, 11-09-2007 17:07:37  
When it is on TDC, the rotor points to the no. 1 cap as it should. I'm going to try the 3116 Autolite plugs and copper wires as RustyFarmall suggested. Thanks, Andy.



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riverbend

11-09-2007 15:55:27




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 Re: Farmall H Running Problems in reply to Andy Motteberg, 11-09-2007 13:29:38  
Two things- 1) do you still have the distributor ? If so, reinstall it and see if the problem goes away.

2) did you replace the main jet packing when you rebuilt the carb ? If so, there may be a crumb of the packing material infront of the needle, cutting down your fuel flow. You will probably have to take the carb apart again to blow it out.

If the tractor ran decent before you changed the mag / rebuilt the carb, finding the problem should be straight forward. If you take it someone else to fix, you will not learn much.

Greg

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Andy Motteberg

11-09-2007 15:58:59




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 Re: Farmall H Running Problems in reply to riverbend, 11-09-2007 15:55:27  
I sold the distributor on eBay a while back because it was the vertical type one and I got sick of trying to time it when it was removed to put in new points.



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El Toro

11-09-2007 15:16:36




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 Re: Farmall H Running Problems in reply to Andy Motteberg, 11-09-2007 13:29:38  
Hold your had hand over the throat of the carburetor and see there's good suction on your hand and your hand should be wet with gas. You need good intake maifold vacuum to pull that atomized fuel into the engine. Good rings and valves seating good all contribute to good a vacuum. Check your intake manifold bolts to see if they're snug. Check that compression to see what it is, worn cylinders and rings can cause
low compression and weak manifold vacuum. Hal

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Andy Motteberg

11-09-2007 15:24:54




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 Re: Farmall H Running Problems in reply to El Toro, 11-09-2007 15:16:36  
The carb is getting air fine and the manifold bolts are tight. The manifold is new and has new gaskets. The tractor ran perfectly fine with the distributor that it had, but this is the first time I've ran it with a mag.



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Janicholson

11-09-2007 13:56:56




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 Re: Farmall H Running Problems in reply to Andy Motteberg, 11-09-2007 13:29:38  
I think it is lean. If it has a main jet adjustment, try adjusting it richer (out one half turn at a time. If it does not respond to this, there may be junk in the main jet system. Checking the spark timing for advance to about 22 degrees is also a good idea. If you do not have a mark on the wheel for advance, calculating the circumference is C=PI times the diameter, then divide that number by 360 to get the length of each degree, then times 22. Measure that distance away from the TDC line, and mark with a marker. Good luck they do have power. JimN

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RustyFarmall

11-09-2007 13:53:21




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 Re: Farmall H Running Problems in reply to Andy Motteberg, 11-09-2007 13:29:38  
You've got the wrong type of spark plugs and possibly the wrong type of wires. A magneto needs non-resistor spark plugs such as Autolite 3166, and it also needs copper wire core plug wires.



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Andy Motteberg

11-09-2007 14:41:25




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 Re: Farmall H Running Problems in reply to RustyFarmall, 11-09-2007 13:53:21  
Hi RustyFarmall,

I searched eBay for Copper wires and non-resistor plugs and I see you have both in your eBay Store. If I bought them, could you combine shipping so it would be cheaper? I'd prefer actual shipping. I'll see what I've got for money, I just spent $25.00 for those automotive wires :(

Andy.



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Andy Motteberg

11-09-2007 14:23:52




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 Re: Farmall H Running Problems in reply to RustyFarmall, 11-09-2007 13:53:21  
Thanks, I will try those other plugs. I wanted to get copper wires, but all they had were automotive wires. I checked at several other stores too and they did not have copper ones. The nearest place I know is Fleet Farm which is about an hour drive from my place. Where should I get copper wires? Thanks.



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Charles E. McNelly III

11-10-2007 14:23:15




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 Re: Farmall H Running Problems in reply to Andy Motteberg, 11-09-2007 14:23:52  
I run D-21 plugs on my W-6 with a mag and have had really good luck with them. I do use copper wires though. Back out the main jet a turn or two and see what happens. Good Luck,
Charles



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