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D17 series IV carb leak
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Too Tall View Drop Down
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Joined: 18 Sep 2016
Location: Illinois
Points: 43 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Too Tall Quote  Post ReplyReply Direct Link To This Post Topic: D17 series IV carb leak
    Posted: 03 Mar 2021 at 1:42pm
The Marvel schebler carb leaks out the bottom of the bowl from that brass looking plug that looks like a cable.  How do you stop that?  i do not even know what that plug is for.  Could it be ok and my float is stuck?  Thanks
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Steve in NJ View Drop Down
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Joined: 12 Sep 2009
Location: Andover, NJ
Points: 11992 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve in NJ Quote  Post ReplyReply Direct Link To This Post Posted: 03 Mar 2021 at 4:56pm
That drain is there just for that reason. It allows fuel to run out if the fuel overflows from the fuel bowls. You could possibly have one of the float pontoons taking on fuel allowing the floats to sink. Better known as a "sinking float".  You also could have a little debris that got caught in the seat of the inlet needle allowing fuel to enter the fuel bowl area raising the float level and causing the overflow. No matter what you do, you'll need two remove the 4 screws the hold the top and bottom together and investigate the problem. I offer Carburetor service parts and rebuilding services if interested.   HTH
Steve@B&B
39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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Too Tall View Drop Down
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Joined: 18 Sep 2016
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Points: 43 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Too Tall Quote  Post ReplyReply Direct Link To This Post Posted: 03 Mar 2021 at 10:03pm
Thanks Steve, I will check that out.
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Stan R View Drop Down
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Points: 992 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Stan R Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2021 at 5:24am
Sounds like your Main carb adjustment is leaking- it is located on the bottom of the bowl. Try tightening the jam nut on it, or back it off and add a bit of teflon tape in the gasket area (threaded portion) and re-tighten, otherwise replace it.

Edited by Stan R - 04 Mar 2021 at 5:51am
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Too Tall View Drop Down
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Joined: 18 Sep 2016
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Points: 43 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Too Tall Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2021 at 11:34am
Thanks Stan R.  I did think of that but i think i isolated the leak to the drain that Steve and I are refering to. I put my finger over that drain and the leak stops.  It has to be something that is causing the gas to overflow into that part of the carb.
It has a TSX871 carb on it.  A kit cost $65 on ebay.  I have never had much luck working on carbs myself.  Also on ebay I seen a rebuilt one for $350 minus $80 for core.  I am not sure what way to go.  We do not have Allis dealers around here anymore.
Steve could you give me a app. cost and turn around time if I shipped it to you?
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Dennis J OPKs View Drop Down
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Joined: 12 Sep 2009
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Points: 516 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dennis J OPKs Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2021 at 11:59am
If you've got a little time & don't mind the shipping, send it to Steve & he'll rebuild it for you.  He did mine a while back --I hope he still offers this service?
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