Temp. sending unit leaking
#3131718
03/23/23 03:10 PM
03/23/23 03:10 PM
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Joined: Apr 2004
Posts: 965 S.W. Pennsylvania
markrr
OP
super stock
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OP
super stock
Joined: Apr 2004
Posts: 965
S.W. Pennsylvania
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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.
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Re: Temp. sending unit leaking
[Re: markrr]
#3131727
03/23/23 03:23 PM
03/23/23 03:23 PM
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Joined: Jan 2003
Posts: 21,076 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,076
Niles , Ohio
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try a bit of permatex brown usually works
Chrysler Firepower
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Re: Temp. sending unit leaking
[Re: moparjim79]
#3131740
03/23/23 04:19 PM
03/23/23 04:19 PM
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Joined: Jan 2003
Posts: 10,735 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,735
North Dakota
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Permatex Pipe SealantYou 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".
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Re: Temp. sending unit leaking
[Re: moparjim79]
#3131778
03/23/23 07:47 PM
03/23/23 07:47 PM
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Joined: Apr 2003
Posts: 12,235 Looking for a way out of Middl...
IMGTX
I Live Here
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I Live Here
Joined: Apr 2003
Posts: 12,235
Looking for a way out of Middl...
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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.
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Re: Temp. sending unit leaking
[Re: markrr]
#3131798
03/23/23 09:00 PM
03/23/23 09:00 PM
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Joined: May 2006
Posts: 1,757 Phila
PhillyRag
top fuel
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top fuel
Joined: May 2006
Posts: 1,757
Phila
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Re: Temp. sending unit leaking
[Re: CMcAllister]
#3131865
03/24/23 10:58 AM
03/24/23 10:58 AM
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Joined: Sep 2003
Posts: 19,479 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,479
north of coder
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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.
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Re: Temp. sending unit leaking
[Re: moparx]
#3131869
03/24/23 11:21 AM
03/24/23 11:21 AM
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Joined: Jan 2003
Posts: 10,735 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,735
North Dakota
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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".
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Re: Temp. sending unit leaking
[Re: 360view]
#3132386
03/26/23 09:18 AM
03/26/23 09:18 AM
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Joined: Jan 2003
Posts: 10,735 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,735
North Dakota
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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".
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Re: Temp. sending unit leaking
[Re: moparx]
#3132492
03/26/23 05:19 PM
03/26/23 05:19 PM
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Joined: May 2012
Posts: 1,841 South Bend
John Brown
top fuel
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top fuel
Joined: May 2012
Posts: 1,841
South Bend
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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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