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Antique Steel Wheel Tractors - Old Iron Lugs and Cleats

1929 John Deere "D" Replaced Needle and Seat on DLTX 3 Carb


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  #1  
Old 06-09-2018, 09:31:43 PM
bmklawt bmklawt is offline
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Default 1929 John Deere "D" Replaced Needle and Seat on DLTX 3 Carb

After fighting the flooding on this carb, buying a new needle trying to grind the seat with the new needle I found this kit 1198-11KIT


The inlet threads on the new seat are 7/16"-27 it's made for a Harley Davidson DLX carb, I needed a 1/8" pipe thread inlet which also happens to be 27 threads per inch so I chucked the new seat in a drill and filed about .030" off the inlet threads


Here it is after filing it down


And here it is tapped to a 1/8" NPT thread
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Old 06-09-2018, 09:42:20 PM
bmklawt bmklawt is offline
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Default Re: 1929 John Deere "D" replaced needle and seat on DLTX 3 carb

I had to cut the inlet threads off the bowl


Then drill and tap it 3/8"-24 for the new seat


And file it flat for the gasket


Here is the new seat installed
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Old 06-09-2018, 09:47:39 PM
bmklawt bmklawt is offline
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Default Re: 1929 John Deere "D" replaced needle and seat on DLTX 3 carb

Here is my test rig for setting the float and the new seat and needle worked perfectly
The new seat is the same height as the original and the needle is stainless steel
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Old 06-10-2018, 12:32:16 PM
Renny Renny is offline
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Smile Re: 1929 John Deere "D" replaced needle and seat on DLTX 3 carb

Thanks for sharing. That will make a lot of old John Deere happy
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Old 06-11-2018, 12:41:36 PM
CBarth66 CBarth66 is offline
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Default Re: 1929 John Deere "D" replaced needle and seat on DLTX 3 carb

Very nice fix on your carb. I replaced my cork float with a brass one and put a new needle in mine. It improved it but still have to tap on it once in a while to stop it from leaking fuel. I may try what you did on yours. Thanks for sharing this.
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Old 06-11-2018, 01:11:07 PM
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Russ Hamm Russ Hamm is offline
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Default Re: 1929 John Deere "D" replaced needle and seat on DLTX 3 carb

A nice job. I built a test tank stand years ago and found a problem, I was using a lawnmower size tank and I found on a couple of carbs that it wasn't enough volume. At least I think that was the case, as the needle and seat tested out but on the tractor it leaked, I assumed that more volume was my problem but may be wrong.
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Old 06-12-2018, 05:43:55 PM
Norm Johnston Norm Johnston is offline
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Default Re: 1929 John Deere "D" replaced needle and seat on DLTX 3 carb

The pressure the rising float applies to the needle to seal is directly related to the weight of the fuel creating pressure against the seat, so yes a larger volume of fuel can make the needle and seat leak with a larger tank full of fuel.
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Old 07-14-2018, 07:41:14 PM
bmklawt bmklawt is offline
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Default Re: 1929 John Deere "D" replaced needle and seat on DLTX 3 carb

After installing this on the tractor and filling up the gas tank (about 20 gallons) the needle and seat still work and seal.
I did have it flood out when I first used it and had to adjust the position of the float on the float lever, once the float was adjusted so there was no binding it seals nicely and I haven't had any issues since.
I'm going the try a Harley #1271-24 float from linkertcarbs.com I think there will be much less clearance issues.
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Old 08-21-2018, 08:07:30 PM
bmklawt bmklawt is offline
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Default Re: 1929 John Deere "D" replaced needle and seat on DLTX 3 carb

I bought the Harley 1193-22 float, I would recommend this float, it is much smaller than the cork or brass float and has more clearance around the stem and the bowl.
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