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#1 |
Registered User
Join Date: Oct 2015
Location: Lincolnshire, IL / Burlington, WI
Posts: 209
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Suggestions to seal a new thermostat switch in manifold
Guys, with the help from this forum I just installed a new Champion aluminum radiator with dual electric fans. I installed the thermal switch (185/170) that I purchased in a relay kit for the fans. The instructions recommended not to use any thread sealant because it may interfere with making a proper and consistent ground. I also read somewhere on the forum not to crank down too hard. Unfortunately I still get a small amount of coolant leaking around the threads. Anyone have suggestions to stop the leaking?
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1970 C-10 CST, LWB, 402/400, A/C |
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#2 |
Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,612
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Re: Suggestions to seal a new thermostat switch in manifold
Take a marker, mark where it tops out at the manifold, then use teflon take for 3 threads past that line.
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#3 |
Registered User
Join Date: Oct 2015
Location: Lincolnshire, IL / Burlington, WI
Posts: 209
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Re: Suggestions to seal a new thermostat switch in manifold
ok, will give it a go!
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1970 C-10 CST, LWB, 402/400, A/C |
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#4 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,896
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Re: Suggestions to seal a new thermostat switch in manifold
I would not use teflon tape for that application, as you need to ensure electrical continuity for the switch to work. I would use a gasket sealer - my preferred sealer is Permatex Aviation Form-A-Gasket.
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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#5 |
Senior Member
![]() Join Date: Oct 2014
Location: New Palestine In
Posts: 931
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Re: Suggestions to seal a new thermostat switch in manifold
I had the same problem when I installed the temp sensor in the left cyl. head. I used Permatex thread sealant and no more leak and the gage reads just fine.
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Phil "Money is only a tool to create and achieve what you want most in life" PayPal: rodnrudy@comcast.net |
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#6 |
Registered User
Join Date: Oct 2015
Location: Lincolnshire, IL / Burlington, WI
Posts: 209
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Re: Suggestions to seal a new thermostat switch in manifold
About how much sealant should I put on the threads?
__________________
1970 C-10 CST, LWB, 402/400, A/C |
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#7 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,896
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Re: Suggestions to seal a new thermostat switch in manifold
Just wet the bottom three or four threads. Then you can wipe off any excess on the exposed threads.
__________________
I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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#8 |
Registered User
Join Date: Jul 2012
Location: Whitehorse yukon
Posts: 1,218
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Re: Suggestions to seal a new thermostat switch in manifold
I use 3 to 4 wraps of teflon tape 30 plus years no leaks no gauge issues
Need to insure both sending unit and npt port are clean and free from corrosion The threads cut through the tape make continuity and the tape seals the gaps between the low points on the threads sealing it in Old broken record wives tail dont seal the threads The only time you dont seal the threads is when there are other mechanical means of sealing example Flared fitting on a brake line Search the board this comes up about every 3 months |
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#9 |
Registered User
Join Date: Oct 2015
Location: Lincolnshire, IL / Burlington, WI
Posts: 209
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Re: Suggestions to seal a new thermostat switch in manifold
Thanks guys, I'll try both methods!
__________________
1970 C-10 CST, LWB, 402/400, A/C |
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