Temperature sensor and bushing

[c10rider]

Hello everyone I have a 74c10 and in installing a temperature sensor into my intake manifold my question is should I use dielectric grease on both bushing and sensor or just on the sensor threads I’m installing electric fans any input will be appreciated


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[bd]

Use neither dielectric grease nor PTFE (Teflon) tape to seal sensor threads.  Instead, apply PTFE paste sealant such as Permatex Thread Sealant with Teflon or blue Loctite.  If you use Loctite, make sure the threads are completely clean, primed with a liberal squirt of engine starter fluid or aerosol carburetor cleaner, and dry before applying the Loctite resin.  Then assemble and tighten the sensor immediately since priming the threads will shorten the cure time of the Loctite.

[c10rider]

Thank you sir


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[JohnnyPopper]

Brake cleaner leaves no residue, jus sayin 

[Mr Diesel]

I would not use any of the above, especially not loctite since sensors wear out and need replacing eventually. Loctite is for holding things fast to keep them from vibrating out, which is NOT an issue with coolant sensors.

Coolant sensors such as these typically use pipe thread, which is basically a tapered thread that gets tighter the farther you thread it in. They don't need thread sealant,  but a thread lubricant won't hurt. The ptfe paste works to lubricate the threads so it threads smoothly and you don't end up with tiny metal shards in the threads causing leaks. You can accomplish this by just using a few drops of engine oil or anything like that.

[JohnnyPopper]

The Diesel man has spoken...

I'm sure the points he makes about Loctite holding 'important' things together is valid.

At the same time, I'm sure bd has his reasons for recommending it .

For me, non-high pressure related threads are consistently served well with thread tape.

Just use enough to get it done right.................right?

[c10rider]

My coolant sensor is not grounding out I let my engine get to 220 degrees the wire that goes to the sensor came with a ring that looks like it should be fastened down but when I fasten it down the fan stays on , I have a pic of it ,


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[JohnnyPopper]

Need more info and better punctuation...Please

[Mr Diesel]

It sounds like your temp switch IS grounding out, which is happening when you attach your black ground wire to the switch prong. I'm a little confused on what your setup looks like, but I'm assuming you already have a temp SENSOR which is telling you the temperature of the engine. I'm also assuming you are connecting that black wire with round ground terminal to a temp SWITCH you have installed to activate the fan. Temp sensors sense temperature and relay the information to a gauge, temp switches sense temperature and activate/close the connection to form a ground, leading to your fans grounding and turning on.

You might want to run some Google searches for how to wire electric fans. It will be informative.

[c10rider]

I figured it out , it was the high temperature thread sealant that wasn’t allowing the sensor to ground out so I  used dielectric grease and my fans work now , as for that ring I’m going to remove it , thank you fellas for helping me I appreciate the input


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[bd]

Which high-temperature thread sealant did you use, initially?

[c10rider]

Permatex high temperature sealant


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