Weeping Thermoquad

Fuel and Air Systems

  1. transman

    transman Member

    Messages:
    24
    Likes Received:
    1
    Joined:
    Apr 27, 2012
    Location:
    Western Canada
    I need some help. I recently rebuilt the thermoquad on my 74 Challenger.
    Now, I've got a couple of weeping leaks on both ends of the rear of the carb. It's weeping between the top and the plastic body.
    I thought that perhaps I'd pinched the gasket, and or the float pins had moved. A new gasket, and double checking the pins to make sure they were in the right spot and still it leaks. The carb is the original one, and had never been rebuilt. It still had the brass floats and they are in great shape. The car has only 38000 original miles on it, so I doubt the body has warped.
    Any ideas?

    Thanks a bunch.

    transman
     
  2. Chryco Psycho

    Chryco Psycho Well-Known Member

    Messages:
    1,408
    Likes Received:
    83
    Joined:
    Dec 28, 2008
    Location:
    Panama
    is it flooding ? the fuel level shoul dnot be high enough for fuel to be higher than the bowl
     
  3. moparleo

    moparleo Well-Known Member

    Messages:
    3,484
    Likes Received:
    243
    Joined:
    Oct 17, 2011
    Location:
    So. Cal. Riverside area
    Thats correct. Recheck and reset all of the adjustments according to the spec sheet that came with the rebuild kit. To check for a warped body lay it on a piece of glass or any flat, hard surface and check.
     
  4. challenger6pak

    challenger6pak Well-Known Member

    Messages:
    2,529
    Likes Received:
    194
    Joined:
    Feb 27, 2011
    My guess is one of the O rings are bad or misaligned where the body connects with the top. Another possible problem is a cracked body on the underneath. I tried to circle where I am speaking of but could not get the program to work. The O rings are in the wells of the first pic located by the front butterlies. In the second pic on the body you can see white compond where the body has two pieces glued to it. The glue wears out and leaks sometimes.

    Thermo-Quad_023FuelBodyTopView.jpg

    Thermo-Quad_024FuelBodyBottomView.jpg
     
    Last edited: Apr 30, 2012
  5. transman

    transman Member

    Messages:
    24
    Likes Received:
    1
    Joined:
    Apr 27, 2012
    Location:
    Western Canada
    Thanks for all your help guys. I've been busy so just got around to fixing the situation.
    The problem was with the float level. I set it at 1" as per the instructionsin the FSM. I reset them to 29/32" and the problem has gone away. I lucked out Monday when an ex-customer of mine asked if I wanted to take a "Chrysler" old carb off his hands. It turned out to be a 9100 series, and helped me put the choke linkage back the way it is supposed to be. Car runs just fine now.

    Thanks again.

    transman
     
Loading...

Share This Page