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Temp. sending unit leaking #3131718 03/23/23 03:10 PM 03/23/23 03:10 PM
Joined: Apr 2004 Posts: 965 S.W. Pennsylvania M markrr OP super stock
markrr OP super stock M Joined: Apr 2004 Posts: 965 S.W. Pennsylvania	I installed a new 440 Source aluminum water pump housing on my 440 with a new aftermarket temperature sending unit. The sending unit leaked through the threads. I replaced the new sensor with my old stock unit and it also leaks. The leak is very small but it's still a leak. Can I put anything on the sending unit threads such as teflon tape or teflon paste (pipe dope) or will a sealant block the sensor's ground? Would a small rubber o ring work? Thanks for any help. Last edited by markrr; 03/23/23 03:10 PM.

Re: Temp. sending unit leaking [Re: markrr] #3131727 03/23/23 03:23 PM 03/23/23 03:23 PM
Joined: Jan 2003 Posts: 21,067 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,067 Niles , Ohio	try a bit of permatex brown usually works Chrysler Firepower

Re: Temp. sending unit leaking [Re: therocks] #3131735 03/23/23 03:54 PM 03/23/23 03:54 PM
Joined: Sep 2014 Posts: 1,404 Central Pa M moparjim79 pro stock
moparjim79 pro stock M Joined: Sep 2014 Posts: 1,404 Central Pa	Tape or dope is fine. Use both sparingly. Never a problem here, both iron and aluminum intakes...

Re: Temp. sending unit leaking [Re: moparjim79] #3131740 03/23/23 04:19 PM 03/23/23 04:19 PM
Joined: Jan 2003 Posts: 10,711 North Dakota 6PakBee I Live Here
6PakBee I Live Here Joined: Jan 2003 Posts: 10,711 North Dakota	Permatex Pipe Sealant You won't have a leak with this material. Just don't tighten it excessively or you probably won't get it out. Just a comment, the concern about insulating the sensor is misplaced, Pipe threads are tapered so the thread flanks will always have metal/metal contact. Thread sealant does nothing but fill the voids in the threads. "We live in a time when intelligent people are being silenced so that stupid people won't be offended".

Re: Temp. sending unit leaking [Re: markrr] #3131752 03/23/23 05:39 PM 03/23/23 05:39 PM
Joined: Mar 2005 Posts: 2,060 Pendleton NY T terzmo top fuel
terzmo top fuel T Joined: Mar 2005 Posts: 2,060 Pendleton NY	High temp silicone on threads. let it cure overnight

Re: Temp. sending unit leaking [Re: terzmo] #3131753 03/23/23 05:55 PM 03/23/23 05:55 PM
Joined: Apr 2021 Posts: 143 Canada E EW1BH27 member
EW1BH27 member E Joined: Apr 2021 Posts: 143 Canada	I have teflon tape near the top of the threads.

Re: Temp. sending unit leaking [Re: moparjim79] #3131778 03/23/23 07:47 PM 03/23/23 07:47 PM
Joined: Apr 2003 Posts: 12,234 Looking for a way out of Middl... IMGTX I Live Here
IMGTX I Live Here Joined: Apr 2003 Posts: 12,234 Looking for a way out of Middl...	Originally Posted by moparjim79 Tape or dope is fine. Use both sparingly. Never a problem here, both iron and aluminum intakes... I agree. The teflon tape & pipe dope fills the gaps in the threads but when you tighten the sensor down you will get metal to metal contact through much of the threads.

Re: Temp. sending unit leaking [Re: markrr] #3131784 03/23/23 08:04 PM 03/23/23 08:04 PM
Joined: Oct 2005 Posts: 268 Anchorage, Alaska metallicareload enthusiast
metallicareload enthusiast Joined: Oct 2005 Posts: 268 Anchorage, Alaska	My stock temp gauge didn’t work at first with a new sensor that had PTFE tape on the threads, tightened it more and now it works 440, 4-Speed, 3.54 1968, when Dinosaurs ruled the Earth

Re: Temp. sending unit leaking [Re: metallicareload] #3131797 03/23/23 08:57 PM 03/23/23 08:57 PM
Joined: Feb 2005 Posts: 3,958 SW Fla. CYACOP master
CYACOP master Joined: Feb 2005 Posts: 3,958 SW Fla.	Perfect application for Never-Seez.

Re: Temp. sending unit leaking [Re: markrr] #3131798 03/23/23 09:00 PM 03/23/23 09:00 PM
Joined: May 2006 Posts: 1,754 Phila P PhillyRag top fuel
PhillyRag top fuel P Joined: May 2006 Posts: 1,754 Phila	Originally Posted by markrr I installed a new 440 Source aluminum water pump housing on my 440 with a new aftermarket temperature sending unit. The sending unit leaked through the threads. I replaced the new sensor with my old stock unit and it also leaks. The leak is very small but it's still a leak. Can I put anything on the sending unit threads such as teflon tape or teflon paste (pipe dope) or will a sealant block the sensor's ground? Would a small rubber o ring work? Thanks for any help. You installed a sensor into Aluminum & didn't use anything on the threads??

Re: Temp. sending unit leaking [Re: PhillyRag] #3131811 03/23/23 10:27 PM 03/23/23 10:27 PM
Joined: Dec 2005 Posts: 11,550 Fulton County, PA C CMcAllister Mr. Helpful
CMcAllister Mr. Helpful C Joined: Dec 2005 Posts: 11,550 Fulton County, PA	Teflon tape or paste on NPT threads - always. If the results don't match the theory, change the theory.

Re: Temp. sending unit leaking [Re: CMcAllister] #3131865 03/24/23 10:58 AM 03/24/23 10:58 AM
Joined: Sep 2003 Posts: 19,383 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 19,383 north of coder	i use loctite 567 paste for everything. works with gasoline, oils, natural gas, propane, butane, potable water, water tanks, and any type of antifreeze. good for any type of fittings as well. been using this stuff for 40 years or so, and i really like it.

Re: Temp. sending unit leaking [Re: moparx] #3131869 03/24/23 11:21 AM 03/24/23 11:21 AM
Joined: Jan 2003 Posts: 10,711 North Dakota 6PakBee I Live Here
6PakBee I Live Here Joined: Jan 2003 Posts: 10,711 North Dakota	Originally Posted by moparx i use loctite 567 paste for everything. works with gasoline, oils, natural gas, propane, butane, potable water, water tanks, and any type of antifreeze. good for any type of fittings as well. been using this stuff for 40 years or so, and i really like it. That's the Loctite equivalent of the Permatex 59214 I use. Good stuff whichever you choose. "We live in a time when intelligent people are being silenced so that stupid people won't be offended".

Re: Temp. sending unit leaking [Re: 6PakBee] #3131949 03/24/23 03:32 PM 03/24/23 03:32 PM
Joined: Apr 2004 Posts: 965 S.W. Pennsylvania M markrr OP super stock
markrr OP super stock M Joined: Apr 2004 Posts: 965 S.W. Pennsylvania	Thanks for the replies. I used the high temp silicone that I have.

Re: Temp. sending unit leaking [Re: PhillyRag] #3131951 03/24/23 03:42 PM 03/24/23 03:42 PM
Joined: Apr 2004 Posts: 965 S.W. Pennsylvania M markrr OP super stock
markrr OP super stock M Joined: Apr 2004 Posts: 965 S.W. Pennsylvania	Originally Posted by PhillyRag Originally Posted by markrr I installed a new 440 Source aluminum water pump housing on my 440 with a new aftermarket temperature sending unit. The sending unit leaked through the threads. I replaced the new sensor with my old stock unit and it also leaks. The leak is very small but it's still a leak. Can I put anything on the sending unit threads such as teflon tape or teflon paste (pipe dope) or will a sealant block the sensor's ground? Would a small rubber o ring work? Thanks for any help. You installed a sensor into Aluminum & didn't use anything on the threads?? No I didn't. I assumed, incorrectly, that sealant on the threads would impede the grounding between the sensor and the housing. Now I know better.

Re: Temp. sending unit leaking [Re: markrr] #3132195 03/25/23 02:42 PM 03/25/23 02:42 PM
Joined: Sep 2003 Posts: 19,383 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 19,383 north of coder	having to repair many threaded connections over the years where dis-similar materials were used, it doesn't take long to learn about anti-seize and sealants. and stainless threaded connections are "fun" unto themselves.

Re: Temp. sending unit leaking [Re: moparx] #3132375 03/26/23 08:32 AM 03/26/23 08:32 AM
Joined: Jan 2006 Posts: 8,162 USA 3 360view Moparts resident spammer
360view Moparts resident spammer 3 Joined: Jan 2006 Posts: 8,162 USA	Stainless steel thumb screws into aluminum rods at a seacoast led me to create many new curse words. I also made the mistake of assuming Dielectric Grease would hurt electrical connections because I had been lectured over and over that “Grounding connections to divert lightning strikes to Earth ground must be kept totally free of paint or visible corrosion”

Re: Temp. sending unit leaking [Re: 360view] #3132386 03/26/23 09:18 AM 03/26/23 09:18 AM
Joined: Jan 2003 Posts: 10,711 North Dakota 6PakBee I Live Here
6PakBee I Live Here Joined: Jan 2003 Posts: 10,711 North Dakota	Originally Posted by 360view Stainless steel thumb screws into aluminum rods at a seacoast led me to create many new curse words. I also made the mistake of assuming Dielectric Grease would hurt electrical connections because I had been lectured over and over that “Grounding connections to divert lightning strikes to Earth ground must be kept totally free of paint or visible corrosion” Same basic approach. I've had people tell me not to use dielectric grease on light bulbs "because it insulates the bulb". No, you still have electrical continuity at the mechanical contact points. The grease just fills the voids to prevent corrosion. "We live in a time when intelligent people are being silenced so that stupid people won't be offended".

Re: Temp. sending unit leaking [Re: moparx] #3132492 03/26/23 05:19 PM 03/26/23 05:19 PM
Joined: May 2012 Posts: 1,821 South Bend John Brown top fuel
John Brown top fuel Joined: May 2012 Posts: 1,821 South Bend	Originally Posted by moparx having to repair many threaded connections over the years where dis-similar materials were used, it doesn't take long to learn about anti-seize and sealants. and stainless threaded connections are "fun" unto themselves. Brass fittings seem to be the cure when used in aluminum. Have always been able to easily remove the brass ones from my swap meet intake buys while the steel fittings give me giant headaches. July 19th should be "Drive Like Rockford Day". R.I.P. Jimmie.

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