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HELP w/John Deere H Problem

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Jen Jensen

10-24-2006 12:18:49

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We have a 1946 John Deere H with Electric Start.
It has been completely rebuilt--head/block/generator/starter/magneto/carb/new manifold. It runs decent, but when it is required to throttle up and under load, it breaks up--runs rough. Any suggestions on what it might be?? We have done everything we can think of. The magneto has been changed, and did improve the situation. The carb was rebuilt, but think it is coming from the carb. Any suggestions appreciated. If anyone has a not rebuilt DLTX46 carb for an H, please let us know.
Thanks.

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Malgorzata Wajda

11-13-2006 03:17:43

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Malgorzata Wajda in reply to Jen Jensen, 10-24-2006 12:18:49

You very site very nice. Thanks owneros. Best.

Malgorzata Wajda

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Olga Kolmakova

11-09-2006 05:11:26

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Olga Kolmakova in reply to Jen Jensen, 10-24-2006 12:18:49

You site very nice. Thanks owner.

Olga Kolmakova

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Mike M

10-26-2006 19:19:16

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Re: HELP w/John Deere H Problem in reply to Jen Jensen, 10-24-2006 12:18:49

one other thing I've had cause fits can be spark plug covers (if you have them) I've had the spark jump to the cover instead of fireing the plug. I had the 90� boots and ends and had to go back to the original forked type ends.

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P Browning

10-24-2006 14:31:51

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Re: HELP w/John Deere H Problem in reply to Jen Jensen, 10-24-2006 12:18:49

Jen -- It sounds like a problem with the accelerating well which surrounds the fuel nozzle. There is a real easy no-wrench test you can run on that tractor which will be revealing. Go to the JD-H Restoration Site (below) and one-click on CARBURETORS. Once the document comes up, go to page 7 - look for TESTING -- LOAD & IDLE PATHWAYS, and run the tests. Please post back with the result for further recommendations, or you can e-mail me anytime with a specific question. (PatB)

Restoration Site, JD-H

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Jen Jensen

10-25-2006 06:15:56

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Re: HELP w/John Deere H Problem in reply to P Browning, 10-24-2006 14:31:51

Thank you. Yes, will let you know how we make out. Jennifer

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buckeye al

10-24-2006 13:44:08

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Re: HELP w/John Deere H Problem in reply to Jen Jensen, 10-24-2006 12:18:49

Are you sure it's load needle (the one close to the fan shaft) isn't just set too lean? Are you sure the plugs are doing their job? May have been fouled enough by the first mag that they now misfire under load but not at idle with the second mag.

Check the valve clearances. Open or sticking valves can cause misfire under load. Are the valves seating properly? Compression the same on both sides?

Valves OK, load needle adjustments are ineffective, new plugs & good mag but still troublesome.... check the fuel level in the fuel bowl. If it's low, the acceleration well becomes ineffective and they fall on their face when you throttle up. They also require a larger than normal (more open) load needle setting when the fuel level is low.

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Jen Jeff Jensen

10-29-2006 08:05:25

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RE: ANSWER TO THE PROBLEM in reply to buckeye al, 10-24-2006 13:44:08

We took the carburetor up to a well-known carburetor specialist by the name of Ray Buetel, Lockport, NY yesterday. He test ran it on his John Deere H. Big problem. The carburetor was dismantled-taking all "new" parts out. We have found that "rebuilding a carb" by some means just putting "new parts" in sandblasting/painting and sending it back to the customer. WRONG! All tolerances/holes should all be checked to make sure there is no slop/drilled out holes by prior hands, etc. Right now, we believe that the nozzle hole in the carb is out of round and someone drilled it out--making it larger--so the nozzle did not seat in properly. It fit very sloppy causing the tractor to not get the appropriate amount of fuel on the high end of throttle up or working. Our advice to all, please know who is rebuilding the carb and ask alot of questions on what they do. They need to check a carb thoroughly in "all aspects". These carbs are over 50 years old + and should be fixed/corrected for any amount of wear, etc if possible. We ended up with another carb body and he took our "core" in. He used all our "new parts" and rebuilt his. He did well by us, and we appreciated him clearing this situation up. He is 2 1/2hrs away, but was worth the journey. Ray retested on his H before we brought it home. Jeff put the carb back on this H here, and it runs great now! SO BEWARE! We learned a valuable lesson the hard way!!! It wasted our time and our customer's. Thanks for all help/ suggestions. Was greatly appreciated. We wanted to make sure we had covered all basis. We are www.agriculturalmemoriesmuseum.com. Jeff/Jennifer

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Jen Jensen

10-25-2006 06:21:19

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Re: HELP w/John Deere H Problem in reply to buckeye al, 10-24-2006 13:44:08

Thankyou for your input.

It has had two sets of brand new AC plugs;has new wires too.

Valve clearance and compression have been checked. Head professionally done by a well-known machine shop.

We have checked the float level several times. We have the original carburetor dealer manual--have read that through.

We are going to take the carb over to a neighbor of our's that has a John Deere H that runs good. Going to see what the carb does on tractor tonight.

Will let you all know how we make out with this tractor. Sure has puzzled us. Jeff has worked on 2-cylinders over 20+ years. Has us completely stumped! Jennifer

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Mike M

10-24-2006 13:16:29

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Re: HELP w/John Deere H Problem in reply to Jen Jensen, 10-24-2006 12:18:49

Make sure ALL the brass plugs in the carb. are sealed with some sealer. Some of the carb. rebuilders are not doing this and it can cause all kinds of fits.

Anyone check the cam and cam bearing ? The left hand cam bearings on those get loose and alot of those cams wear from rust/moisture from lack of lube. But I have seen some loose ones still run good but you never know ?

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Jen Jensen

10-25-2006 06:23:10

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Re: HELP w/John Deere H Problem in reply to Mike M, 10-24-2006 13:16:29

What is recommended to seal the brass plugs in the carb? This carb was done by Burrey Carb.

Yes, we replaced the cam bearing.

Thanks-will let you know-Jennifer

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Mike M

10-25-2006 07:58:01

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Re: HELP w/John Deere H Problem in reply to Jen Jensen, 10-25-2006 06:23:10

That's the same guy that did the one that was driving a local mech. NUTS !!!! Just take that carb. off and pull off the bowl and remove ALL the brass plugs and seal them with non-hardening permatex. This just may be your problem too ??? His was sucking air in and you couldn't get the adjustments to hold.

You did put wires on with WIRE in them didn't you ?

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Jen Jensen

10-28-2006 04:13:03

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Re: HELP w/John Deere H Problem in reply to Mike M, 10-25-2006 07:58:01

Yes, the wires are original style with correct ends done by a reputable firm--brand new. We will know more today when we put the carb on another H. Will let you know how we make out. We have had the carb apart several times and just cannot find the problem. Unless, it is the replacement nozzle. Thanks for all your input.

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