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73-87chevytrucks.com
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73-87 Chevy _ GMC Trucks
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Temperature sensor and bushing
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Topic: Temperature sensor and bushing (Read 2062 times)
c10rider
Newbie
Posts: 47
Newbie
Temperature sensor and bushing
«
on:
September 16, 2020, 07:48:36 PM »
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
Global Moderator
Senior Member
Posts: 6454
Re: Temperature sensor and bushing
«
Reply #1 on:
September 16, 2020, 08:47:25 PM »
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.
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Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)
c10rider
Newbie
Posts: 47
Newbie
Re: Temperature sensor and bushing
«
Reply #2 on:
September 18, 2020, 03:15:43 PM »
Thank you sir
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JohnnyPopper
Senior Member
Posts: 2554
Old Goof
Re: Temperature sensor and bushing
«
Reply #3 on:
September 21, 2020, 10:53:50 AM »
Brake cleaner leaves no residue, jus sayin
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1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400 Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction
Mr Diesel
Frequent Member
Posts: 332
Aaron
Re: Temperature sensor and bushing
«
Reply #4 on:
September 22, 2020, 08:21:25 PM »
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.
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1976 C20 Crewcab, 6.2L/SM465
1982 K30 Crewcab , 427TD/TH400
1983 C30, 6.2L/TH400
1983 K30 Crewcab 454/700R4
1986 K10 350/400. 1989 K30 cab/chassis 454/SM465
JohnnyPopper
Senior Member
Posts: 2554
Old Goof
Re: Temperature sensor and bushing
«
Reply #5 on:
September 23, 2020, 12:12:19 AM »
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?
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1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400 Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction
c10rider
Newbie
Posts: 47
Newbie
Re: Temperature sensor and bushing
«
Reply #6 on:
September 25, 2020, 07:30:14 PM »
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
Senior Member
Posts: 2554
Old Goof
Re: Temperature sensor and bushing
«
Reply #7 on:
September 25, 2020, 08:40:40 PM »
Need more info and better punctuation...Please
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1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400 Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction
Mr Diesel
Frequent Member
Posts: 332
Aaron
Re: Temperature sensor and bushing
«
Reply #8 on:
September 26, 2020, 12:04:33 PM »
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.
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1976 C20 Crewcab, 6.2L/SM465
1982 K30 Crewcab , 427TD/TH400
1983 C30, 6.2L/TH400
1983 K30 Crewcab 454/700R4
1986 K10 350/400. 1989 K30 cab/chassis 454/SM465
c10rider
Newbie
Posts: 47
Newbie
Re: Temperature sensor and bushing
«
Reply #9 on:
September 26, 2020, 08:01:11 PM »
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
Global Moderator
Senior Member
Posts: 6454
Re: Temperature sensor and bushing
«
Reply #10 on:
September 27, 2020, 12:27:15 PM »
Which high-temperature thread sealant did you use, initially?
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Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)
c10rider
Newbie
Posts: 47
Newbie
Re: Temperature sensor and bushing
«
Reply #11 on:
September 27, 2020, 03:59:30 PM »
Permatex high temperature sealant
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Temperature sensor and bushing