MS TSX 706 Carb update

[GlenIdaho]

Greetings all! Here is an update on my carb issue. I have not been able to find a power jet (main jet) for the TSX 706 carb. Does anyone know the size of the jet and its threads? Does anyone know where I can get one? The rebuild kits only have one jet and it is the idle jet. I have searched the web and have found plenty of jets, but no power jet for the 706. I am beginning to think this particular model did not use one. With reference to the power adjustment needle seat, I was able to clean it up using some valve lap compound. Any help is greatly appreciated.

 

[wore out]

Looking at the photo you previously posted, that pressed-in jet is still in place.

I think your flooding issue is caused by something else, Are you SURE the ''load adjustment screw'' that enters the jet from above is the correct one for your carburetor? (Length and tip size.)

How about the venturi, is it correct for the carb and undamaged? Is the body gasket correct and sealing around the venturi?

In some carbs the venturi can be installed downside up. Probably NOT this one, but worth checking out.

 

[GlenIdaho]

Thank you for getting back to me. If we're looking at the same thing in the bottom of the bowl, that is the seat for the power adjust needle. The jet I am speaking of is at the bottom of the nozzle passage. It is seen in various MS diagrams. Unfortunately the rebuild diagram gives the jet the number 27 on the parts list with no other identifying numbers. The power adjust needle is the correct one comparing it to a new rebuild kit. The venturi was installed correctly and is the correct one as far as I know. You'll have to bear with me on my ignorance of the MS carb. They made many such carbs with variations. Trying to find exact info regarding this particular carb has been difficult. Most diagrams are generic. I haven't been able to find any specs on the jets for the TSX 706. I'm hoping someone who has expertise on this carb will come along. Thanks again for your suggestions.

 

[Tim PloughNman Daley]

You're putting too much into this. ALL M/S TSX Carbs are basically the same. The carb used 8-32 the thread size but I wouldn't muck with trying to chase with a tap for risk of breaking off. I use pipe cleaners and old guitar strings to chase ports with after weeks of soaking in my carb cleaning formula. Besides, you don't need to replace all the internal parts like the brass jet ports - what wears? I use pipe cleaners and my old guitar strings to chase passages with after weeks of soaking in my carb cleaning formula. Here is are two pages from the M/S Parts and ID Manual for FORD HUNDRED SERIES TSX models. Note Page 2,.last column on right lists TSX-706 Model.


MARVEL-SCHEBLER TSX CARB INFO for FORD TRACTOR HUNDRED SERIES:

FROM PREVIOUS POSTS:

Tim Daley(MI)

 

[Tim PloughNman Daley]

You're putting too much into this. You don't need to replace all the internal parts like the brass jet ports - what wears? ALL M/S TSX Carbs are basically the same. The carb used 8-32 the thread size but I wouldn't muck with trying to chase with a tap for risk of breaking off. I use pipe cleaners and old guitar strings to chase ports with after weeks of soaking in my carb cleaning formula. I use pipe cleaners and my old guitar strings to chase passages with after weeks of soaking in my carb cleaning formula. Here is are three pages from the M/S Parts and ID Manual for FORD HUNDRED SERIES TSX models. Note Pages 2 & 3, last column on right, lists the 706 Model.


MARVEL-SCHEBLER TSX CARB INFO for FORD TRACTOR HUNDRED SERIES:

FROM PREVIOUS POSTS:

Tim Daley(MI)

 

[JMOR]

Well, I thought this was all done. RE:
GlenIdaho
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PostPosted: Thu Feb 23, 2023 2:33 pm Post subject: Re: TSX 706 Carburetor- broken jet Reply to specific post Reply with quote
Thank you very much, greatly appreciated. I now understand more fully. I'll take a closer look to see what I can do to clean it up. I am assuming that if the edge were left jagged it would effect the seating of the needle. How to even it up may be a challenge, perhaps a Dremel Tool with a small grinding wheel?

However it looks like you are still looking for a main jet that may or may not exist. Below the nozzle, is there a threaded hole that would accept such jet?

 

[GlenIdaho]

Hello Tim, thank your for your reply and all the pages. I am really not trying to make this more than it is. I am just trying to determine if the TSX 706 is supposed to have a power Jet, also called a main jet. From looking at the various diagrams and information, it is a little confusing. One of the reasons is the use different names for the same part. Not being an expert with these carbs I am trying to get the straight facts.

So, what have I seen? From the looks of pages 2 and 3 they appear to be parts lists for each of the MS carbs listed and in the columns on the right and they note the number (how many) of each part used in each carb. If there is no number in the column, there is no part for that particular carb. Please correct me if I am wrong.

Pages 1,2,3 show no listing for a main jet or jet-power for any of the carbs listed, however, Page 3 shows a Fuel inlet fitting and identifies it with Ford part number 9N9533. This corresponds to your page 4 item 20 called the Main Jet and is also identified as part number 9N9533. This item corresponds to your page 6, item 26 called the Jet-power. Am I to conclude that theFuel inlet fitting part number 9N9533 is the same as the main jet part number 9N9533? If this is the case, then according to page 3 there is no fuel inlet fitting used in the TSX 706. Is that correct?

The information on the threads, 8-32 is helpful. Foregoing all of the above, if there is indeed a main jet used in the 706, I need the orifice size too and where to find one.

I think you can see the confusion in someone's mind caused by the different names and diagrams. Thanks again for your help. Please bear with me.

 

[wore out]

You do realize that in normal operation the ''load'' adjustment needle will NEVER be tightly seated into the source of your aggravation, RIGHT?

There's always going to be a ''gap'' between the jet and the needle for ''load'' fuel'' and ''idle fuel to pass through, adjusting the ''load needle'' just ''fine tunes'' how much fuel is able to pass.

When does it ''flood''/get too much fuel, at idle, at higher speeds, or at all throttle settings?

(IF the overfueling problem shows up only above idle and IF the ''load needle'' has been replaced with one from a generic carburetor kit I would be FAR more suspicious that it is not ''correct'' in some way than that the non-replaceable ''jet'' beneath it is causing your issue.)

 

[GlenIdaho]

Lol, thanks for levity or was it sarcasm? I never claimed to be an expert. As you know YT places those titles, not the user. I'm just a learner. Yes, I did understand more fully by the information given. Please forgive my ignorance. As far as the power adjust needle seat, I used some valve grinding compound to mate the needle and the seat. It should be fine.

I thought it was done too until I started trying to find a main jet.In my search I have come across conflicting information from those who have expertise, which has not helped at all. I was hoping someone could give a definite answer as to the TSX 706 having a main jet or not. If so, it's thread size and orifice size. I have found sources for jets, but I need this information.

Yes, there appears to be threads below the nozzle. I'm going to check it out further today.My old eye don't see as well as they used to. No threads, equals no jet.

I do sincerely appreciate the help of those willing to do so and their patience.

 

[GlenIdaho]

Yes, I understand its operation. It does not flood out. At idle it smokes black smoke. It somewhat clears up with more RPM, but not fully. It fouls the plugs with soot, not oily, just soot. I think the issue with the power adjustment needle is resolved. Thanks for your help.

 

[wore out]

How did you resolve the ''jet'' issue???

Excess fuel at idle would NOT be caused by the ''load'' needle or the jet beneath it.

You should be able to remove the load needle ENTIRELY without affecting the idle mixture.

Remember that the ''idle mixture'' adjustment works BACKWARDS as it meters the AIR entering the idle mixture, NOT the fuel.

Turning the idle mixture screw CCW/''out'' admits more air, LEANING the idle mixture.

 

[GlenIdaho]

The jet issue is not resolved. The power adjustment needle and seat is resolved. Still trying to determine if there even is a jet issue, i.e. does the TSX 706 use a main jet also called a power jet below the nozzle? Yes, the adjustments I understand.

 

[JMOR]

(quoted from post at 12:21:26 03/02/23) The jet issue is not resolved. The power adjustment needle and seat is resolved. Still trying to determine if there even is a jet issue, i.e. does the TSX 706 use a main jet also called a power jet below the nozzle? Yes, the adjustments I understand.

n 2016, another fellow ran into your jet pickle:
https://forums.yesterdaystractors.com/viewtopic.php?p=6050410&highlight=tsx706#6050410

 

[GlenIdaho]

aaaahhh! Thank you so much. That answers the question. Hallelujah, I can move on! No main jet to worry about!

Thank you sir!