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Right Carburetor For Hh120 Engine?


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#1 mrcountry OFFLINE  

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Posted March 09, 2014 - 04:25 PM

Hi, I have a 1966 Sears Suburban with a cast iron 12  hp engine. The carb was the wrong one on it. Came off a generator. The correct carb number was 631877, but, this was replaced by 631915a. Am wondering if there is a certain other carburetor that will work, or if there is an old one that I can rebuild with new throttle and choke shafts. I am using this tractor to till, snow plow and pull a big roller. No mowing. Would appreciate any help. thanks.



#2 TAHOE OFFLINE  

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Posted March 09, 2014 - 04:35 PM

My 12 came with a Walbro 29. I think a Walbro 37 will also work. 

I know a guy who found a brand new replacement one off Ebay, but I think he just lucked out on that. 


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#3 EricFromPa OFFLINE  

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Posted March 09, 2014 - 05:02 PM

You can use any 8-12hp carb as long as is will bolt up and the governor linkage doesn't bind up.I prefer to use the fully adjustable carbs.Fixed main jet carbs are hit and miss if the will work or not.

 

 

I like to use the Original LME carbs though.They seem to start and Run the same constantly unless they get dirt in the secondary idle jet.The newer ones will need to be adjusted from time to time to keep from leaning out.

 

LME carbs are getting hard to come by in usable condition.Often times they are corroded to bad to save.

 

I did find a couple good used ones on Ebay.

 

Good price if it doesn't need rebuilt.

$47.99 + shipping

http://www.ebay.com/...04834339&rt=nc 

 

 

OUCH

$84.99 + 11.58 shipping

http://www.ebay.com/...=p2054897.l4275

 

 

And 1 of the "NEW" carbs

$79.95 + shipping

http://www.ebay.com/...=item1e88246d35


Edited by EricFromPa, March 09, 2014 - 05:15 PM.

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#4 classic OFFLINE  

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Posted March 09, 2014 - 05:09 PM

The main thing to look for on the LME carbs for the HH120 is to check the venturi size. If you remove the choke shaft and look in the bore of the carb, you will see a raised number. All of the LME carbs I've seen for the HH120 have the number 55 cast into them even if the number on the outside is different. I know LME 27, 34, and 36 are all for the HH120. Throttle shaft play will drive you nuts. If yours is sloppy, put bushings in it and try to locate a new throttle shaft.Carbrescue can fix you right if need be.
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#5 MFGray OFFLINE  

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Posted March 09, 2014 - 05:10 PM

I have tried to keep a record of which carbs work with which engines based on the different posts that I have read here and elsewhere. It does seem that there is not much discernible difference between those for the HH100 and the HH120 so that the two types are almost interchangeable. That being said, the HH120 seems to have used the LME 27, 33, 34 and 36, while the HH100 used carbs with a 3/4" or occasionally 11/16" venturi and the 86-57 nozzle, specifically LME 16, 17, 25, 26, 28, 29 and 37.  The HH120 carbs either used the same nozzle and a narrower venturi (e.g. the LME 27 - more suction and fuel at higher speeds) or a wider venturi and a wider nozzle as well (33, 34 and 36) for the same effect. This differs from Tahoe's experience, but it does seem that the two types were interchanged by owners, so he may well be right.


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#6 EricFromPa OFFLINE  

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Posted March 09, 2014 - 05:32 PM

The main thing to look for on the LME carbs for the HH120 is to check the venturi size. If you remove the choke shaft and look in the bore of the carb, you will see a raised number. All of the LME carbs I've seen for the HH120 have the number 55 cast into them even if the number on the outside is different. I know LME 27, 34, and 36 are all for the HH120. Throttle shaft play will drive you nuts. If yours is sloppy, put bushings in it and try to locate a new throttle shaft.Carbrescue can fix you right if need be.

 

CarbRescue charges $50 for both bushings installed and $75 for both bushings and new throttle shaft + shipping if you need throttle shaft bushings put in.But if you can find one really cheap it's definitely worth it.

 

They sell Just the shaft and Bushings for $50 for the set.So having the machine work done for $25 is a great deal.

 

An Overhead Valve 120-160 LMH carb will not work.


Edited by EricFromPa, March 09, 2014 - 05:36 PM.

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#7 drbish ONLINE  

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Posted March 09, 2014 - 05:44 PM

Here is an application cross reference for LME carbs

lme1.JPG lme2.JPG

I will scan the rest of the info out of my service manual and post here

Attached File  lme pr.PDF   2.86MB   129 downloads


Edited by new restorer, March 09, 2014 - 05:59 PM.

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#8 superaben OFFLINE  

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Posted March 09, 2014 - 07:14 PM

Here is an application cross reference for LME carbs

attachicon.giflme1.JPGattachicon.giflme2.JPG

I will scan the rest of the info out of my service manual and post here

attachicon.giflme pr.PDF

 

You don't have an LMG x-ref, do you, Don?  I'd love to see that. 

 

Ben W.


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#9 superaben OFFLINE  

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Posted March 09, 2014 - 07:19 PM

I'll check my salvage carburetor "department."  It reads that I have a 631915.  I doubt if it is any good, it is not listed as rebuildable, so don't get your hopes up. 

 

Ben W.


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#10 drbish ONLINE  

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Posted March 09, 2014 - 07:27 PM

You don't have an LMG x-ref, do you, Don?  I'd love to see that. 

 

Ben W.

Here it is

Attached File  LMG.PDF   2.56MB   74 downloads

Let me know what else you need


Edited by new restorer, March 09, 2014 - 07:31 PM.

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#11 superaben OFFLINE  

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Posted March 09, 2014 - 07:48 PM

Bless your old scanner's CPU, Don. 

 

Thanks for sending that along.  That will be a huge, capitalize that, HUGE, help.

 

Ben W.


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#12 TAHOE OFFLINE  

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Posted March 10, 2014 - 09:19 AM

I have tried to keep a record of which carbs work with which engines based on the different posts that I have read here and elsewhere. It does seem that there is not much discernible difference between those for the HH100 and the HH120 so that the two types are almost interchangeable. That being said, the HH120 seems to have used the LME 27, 33, 34 and 36, while the HH100 used carbs with a 3/4" or occasionally 11/16" venturi and the 86-57 nozzle, specifically LME 16, 17, 25, 26, 28, 29 and 37.  The HH120 carbs either used the same nozzle and a narrower venturi (e.g. the LME 27 - more suction and fuel at higher speeds) or a wider venturi and a wider nozzle as well (33, 34 and 36) for the same effect. This differs from Tahoe's experience, but it does seem that the two types were interchanged by owners, so he may well be right.

 

You may be right, I may have gotten my numbers all confused. My 12 maybe a 27 not 29. I have been told the 12's have a slighter larger throat than the 10, but I've also been told people have swap them between the motors and have ran fine.


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#13 mrcountry OFFLINE  

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Posted March 10, 2014 - 11:21 AM

Want to thank all who responded. Gave me a lot of info I was needing. Am starting on restoring this tractor and have the engine ready to paint. It has been overhauled and hope to have rest of tractor done this summer. Again, Thanks all



#14 superaben OFFLINE  

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Posted March 10, 2014 - 07:35 PM

No good on my carburetor, it is indeed a copy, but the mounting flange is broken off and and the whole thing is a corroded mess.  I filed it away today under "scrap."

 

Ben W.






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