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  #1  
Old 10-10-2018, 02:06 PM
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Default 430 surge tank

Hello,

I'm finally putting my 430 back together after years. Runs great but I can't seem to get the surge tank to seal at the thermostat housing. 3 tries with various sealers. Most recently I filled the pits on the surge tank flange with JB Weld and sanded the surface flat. Then used "The Right Stuff" which I have used everywhere else with good success - new FelPro gasket. Now leaking worse than ever, even with no pressure.

I can buy a (new?) surge tank from TBirdHQ for $200, but it may have the same problem.

Should be simple, but I'm at my wits end with this - any ideas?

Thanks,

John
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  #2  
Old 10-10-2018, 02:17 PM
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My suggestion is to put a straight edge across both the tank and intake flanges. Obviously one or the other is not flat.

John
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  #3  
Old 10-10-2018, 02:54 PM
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I have done this, using a small machinist square (very carefully), under magnification. Looked 100% ok.
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  #4  
Old 10-10-2018, 06:43 PM
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Make sure your flange doesn't have a crack. It happened to me on my Y-Block. The housing neck was cast iron and I couldn't find the leak for the longest time. Tried a different one and it's been great ever since.

I realize your flange is permanently attached but check it out. - Dave
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  #5  
Old 10-12-2018, 01:28 PM
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Default Surge tank - success

Hi all, that flange wasn't flat enough. I bought a small Ryobi belt/disk sander and brought it down to perfectly flat with no pitting. Sealed up fine with Permatex blue sealer!

Thanks,

John
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