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Tillotson carb questions (29 Chev)


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carb1.jpg.7c7c814c1ffadcf7a0581280f379a138.jpgcarb2.jpg.e09521b7c1a2fec5f7e0e48fa44fd036.jpgI have a couple of questions for the Tillotson experts out there. I had been told this was a JR5, but when my rebuild kit arrived it was clear this was not a JR5. Everyhting looked pretty good so I decided just to clean everything the best I could and use it as is. It worked fine before so it should be pretty simple. well, Last weekend I finally had time to try and get my 29 Chev running. I found quickly fuel pours out the carb. I assumed the needle and or float were to blame, but they both appear to be functioning as they should. I found the fuel was pouring out the accelerator pump spout (red circle). when I block this with my finger the fuel comes out the hole  above it (green circle) and with both blocked off fuel comes out the brass spout(blue circle).

When I push the accelerator pump down an awful lot of fuel gets pumped out.

My next question is the second photo. what is the system with the orange circles? the two spring loaded parts act together, but what I dont know. Both parts refused to come undone so I decided to leave them alone before I broke something. Lastly what is the adjustment in the yellow circle? 

From all my questions you may be able to tell I know a little about carbs, but not enough to pinpoint when things go very poorly. You might say I know just enough to be dangerous. Any help would be very appreciated!! Also what model is this?

Thanks!

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There was no real problem with it. I was just looking to clean out the crusty old gas and replace gaskets.  I had the whole motor apart so it seemed fitting to clean up the carb as well.  When I bought the car I only started it a few times before I began to take it apart.  For having 75 year old plugs, rotten wires and 2" of caked oil covering the whole engine it ran decent(except for the bottom end thump that has been dealt with). The car had been mostly sitting since the 70s. started once a year just to keep it going.

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8 minutes ago, maok said:

The yellow circle is probably a drain plug, my JR2 has it is under side of the fuel bowl, a simple screw plug.

I thought the same, but the other end it a needle that seats into something? Im guessing an adjustment for?

 

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Terry, the first thing I would check is the float and needle valve. For gas to pour out of the "accelerator pump snout" the float can't be holding. I would bolt on the top half of the carb and manually work the float to see if it stops the flow of gas.

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22 minutes ago, 46 woodie said:

Terry, the first thing I would check is the float and needle valve. For gas to pour out of the "accelerator pump snout" the float can't be holding. I would bolt on the top half of the carb and manually work the float to see if it stops the flow of gas.

When its all together and I hold it upside down so the needle is seated and blow lower pressure air the needle seats tight. I assumed this was the problem, but it seems to seal fine.

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1 hour ago, TerryB said:

Is your fuel pressure to the carb in spec?  Do you have an electric fuel pump in line somewhere?  

I dont, but thanks for the lesson. I would never have thought of that. Something only learned the hard way.

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Congratulations. You have found an un-recycled Rayfield model HC.

 

Produced by the Marvel/Schebler division of Borg-Warner. Sold with a water decal stuck on the end of the bowl with the "name du jour" (Wizard, Rayfield, Johnson, M/S, etc.). It could have been purchased through Western Auto, J.C. Whitney, Warshawski, etc.

 

Jon.

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3 hours ago, carbking said:

Congratulations. You have found an un-recycled Rayfield model HC.

Thanks for the info!! I finally now know what I have.  I wish it was a slightly more common Carb.

I believe I found the problem of the gas. As usual the simplest answer is usually the right one. I checked the float and needle with very low pressure way back. Since then I had replaced the fuel pump and now with increased pressure I now have rechecked and that needle is not sealing at all. I have a feeling it will be far easier finding a different carb than parts for a oddball carb. Thanks for all the help everyone!!

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I would bet that a needle and seat would be easy to find that will fit. I have used parts from different carbs with perfect success. I have a Tillotsen with Zenith, Pontiac, and Ford Mustang parts in it and it was a good runner.

 

Here is a start.

https://www.daytonaparts.com/daytona-carburetor-float-valve.html

Edited by JFranklin
adding a link (see edit history)
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7 hours ago, theterrym said:

that needle is not sealing at all

Is there a wear groove in it? You may be able to remove that groove with a spot of lathe work. Clockmakers have little lathes for small work like that.

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