Re: 1973 340 Thermquad Leaks after Shutting Off, Help!
[Re: IMGTX]
#2695501
09/08/19 04:06 PM
09/08/19 04:06 PM
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Joined: Feb 2009
Posts: 1,149 NW New Jersey
RSI700VIPER
OP
super stock
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OP
super stock
Joined: Feb 2009
Posts: 1,149
NW New Jersey
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Well, carefully took the carb apart being careful not to spill any fuel so i can examine the fuel in the bowls. After removing the lid, the right side was half full and the left side was about 1/8 full, just about to the top of the jet. I filled both bowls up with fuel, but there was no leaks coming from the plastic transfer wells and the epoxy looked good. I even tried to twist them apart but they didn't budge. Floats were adjusted properly and held compressed air when the top was inverted. O-rings may not have sealed perfectly as one looked a little crooked sitting in the body. I will replace the o-rings and see what happens.
Last edited by RSI700VIPER; 09/08/19 04:09 PM.
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5 1969 Daytona Charger 440 4-Speed, Dana, EV2 1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7 1970 340 Six Pack Callenger T/A 4-speed T8 Tan 1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth 1969 Talladega Torino, 428CJ 1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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Re: 1973 340 Thermquad Leaks after Shutting Off, Help!
[Re: Y3 70 BEE]
#2695592
09/08/19 09:51 PM
09/08/19 09:51 PM
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Joined: Feb 2009
Posts: 1,149 NW New Jersey
RSI700VIPER
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OP
super stock
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Thanks for the additional input. Needle and seats hold air pressure from my compressor so they should hold fuel. Also, when I looked down into the carb past the butterflies, the top of the intake was soaked with gas, not just a couple of drops. I was definately expecting a crack or something more obvious like a dislodged well but everything looks fine. It ran fine for 2 years then something happened overnight. If it were a Holley, I would have said a power valve but not the case here.
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5 1969 Daytona Charger 440 4-Speed, Dana, EV2 1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7 1970 340 Six Pack Callenger T/A 4-speed T8 Tan 1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth 1969 Talladega Torino, 428CJ 1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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Re: 1973 340 Thermquad Leaks after Shutting Off, Help!
[Re: surfman]
#2695661
09/09/19 07:47 AM
09/09/19 07:47 AM
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Joined: Feb 2009
Posts: 1,149 NW New Jersey
RSI700VIPER
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super stock
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OP
super stock
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NW New Jersey
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Surfman- I might be having seepage after a few hours, but gas is dripping into the intake and soaking the manifold after a few seconds of shutting off the motor. My problem is not the epoxy holding the well cap on.
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5 1969 Daytona Charger 440 4-Speed, Dana, EV2 1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7 1970 340 Six Pack Callenger T/A 4-speed T8 Tan 1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth 1969 Talladega Torino, 428CJ 1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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Re: 1973 340 Thermquad Leaks after Shutting Off, Help!
[Re: Y3 70 BEE]
#2695785
09/09/19 12:55 PM
09/09/19 12:55 PM
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Joined: Aug 2007
Posts: 6,096 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,096
Valencia, España
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Take it apart and fill the plastic main body with enough water to see if the wells seep. If they seep, carefully remove the wells and scrape off the old glue and glue them back on using SEAL ALL. I'd use same gas to check for leaks. Gas, or similar oil products ( thinner for example ) goes easier by tiny cracks than water.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: 1973 340 Thermquad Leaks after Shutting Off, Help!
[Re: Sniper]
#2695787
09/09/19 01:01 PM
09/09/19 01:01 PM
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Joined: Aug 2007
Posts: 6,096 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,096
Valencia, España
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The first two Thermoquads I have rebuild I over tightened the top and crushed the X-rings. DO NOT OVER TIGHTEN THE TOP. Gentle gentle gentle. You can always snug it a little more later if it leaks out the sides of the top when cornering but you can not buy those X-rings with out the $35 kit. If anyone knows where to get them individually I would love to know.
G902 Primary Well Seal, $3.00 THIS IS SERIOUS? DO THEY HAVE PHENOLIC BOWLS!!! thats AMAZING wondering what kind of them... here are several dozen of them depening on carb PN
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: 1973 340 Thermquad Leaks after Shutting Off, Help!
[Re: NachoRT74]
#2695826
09/09/19 03:36 PM
09/09/19 03:36 PM
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Joined: Jan 2007
Posts: 953 Badham Co.
Y3 70 BEE
super stock
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super stock
Joined: Jan 2007
Posts: 953
Badham Co.
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The first two Thermoquads I have rebuild I over tightened the top and crushed the X-rings. DO NOT OVER TIGHTEN THE TOP. Gentle gentle gentle. You can always snug it a little more later if it leaks out the sides of the top when cornering but you can not buy those X-rings with out the $35 kit. If anyone knows where to get them individually I would love to know.
G902 Primary Well Seal, $3.00 THIS IS SERIOUS? DO THEY HAVE PHENOLIC BOWLS!!! thats AMAZING wondering what kind of them... here are several dozen of them depening on carb PN Do a search on Ebay for Thermoquad you will find all kinds of small stuff like that.
Last edited by Y3 70 BEE; 09/09/19 03:45 PM.
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