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John Deere Tractors Discussion Forum
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John Deere B Carburetor

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Andy Motteberg

11-05-2007 20:52:28




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Will a DLTX-10 carburetor replace a DLTX-34 carburetor? What is the difference between these two carburetors?

Thanks.




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Duane Larson

11-12-2007 14:51:47




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 Re: John Deere B Carburetor in reply to Andy Motteberg, 11-05-2007 20:52:28  
Andy,
The throttle-end bore (and hence the throttle plate) is larger on the 34 - 1 5/16 on the 10 and 1 3/8 on the 34. The nozzles are also different, along with some internal passage sizes. While most DLTX carbs will bolt-up properly, there are some significant differences in the various models.



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CalJim

11-06-2007 20:36:16




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 Re: John Deere B Carburetor in reply to Andy Motteberg, 11-05-2007 20:52:28  
According to Robert's Carb Repair you can temporarily substitute a 34 or 67 for a 10 as long as it's just a parade tractor. I installed a 67 on my 36 B while waiting for the correct model 10 to be rebuilt. Ran like a champ, in fact it was hard to tell any difference once I put the 10 on. That being said, I'm not sure how the smaller 10 would work on the newer, larger styled engines. CalJim



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Duane Larson

11-06-2007 05:46:30




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 Re: John Deere B Carburetor in reply to Andy Motteberg, 11-05-2007 20:52:28  
Andy,
The throttle-end bore (and hence the throttle plate) is larger on the 34 - 1 5/16 on the 10 and 1 3/8 on the 34. The nozzles are also different, along with some internal passage sizes. While most DLTX carbs will bolt-up properly, there are some significant differences in the various models.



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P Browning

11-06-2007 06:37:52




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 Re: John Deere B Carburetor in reply to Duane Larson, 11-06-2007 05:46:30  
An interesting side note -- Field Service Bulletin 137-S issued 9-15-1942 instructed JD techs to be more diligent when installing carburetor-to-manifold gaskets. It seems that gaskets made for the "H" model with a bore smaller than all the rest were ending up being installed on tractors other than the "H" -- resulting in lack of horsepower. The interesting part -- the "fix" was to discontinue supplying the smaller gasket to dealerships for it turned out, using the larger ID gasket (one-size-fits-all) on "H" tractors worked out just fine. One has to wonder how much head-scratching was done before this problem was discovered! (PatB)

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wilamayb

11-06-2007 04:03:35




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 Re: John Deere B Carburetor in reply to Andy Motteberg, 11-05-2007 20:52:28  
Andy

I once thought that the 10 was offered with the 149 in engine while the 34 was offered with the 175 in. engine. This is not true. B tractors between SN 60000-96000 had a 175 engine with a 10 carburetor.

All that said the 34 must have been a better performer as it was used on the 96000 and up tractors making about 2 more horsepower than the tractors before 96000. I would almost dare to guess that the bore is larger on the 34 and I would almost guess that it had a different nozzle.

I've serviced a few 34's but never a 10. Too bad you dont have both to put them on the bench and compare. Maybe some of our carburetor experts have had both on the bench at the same time.

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Andy Motteberg

11-06-2007 09:38:43




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 Re: John Deere B Carburetor in reply to wilamayb, 11-06-2007 04:03:35  
I do have two, the 34 has bad threads, but we have a 10 with good threads.



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