Oil pressure sender switch and coolant sender what type of thread sealant to use since your not supposed to use Teflon so it can ground correctly

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

W

wildone454

Member
Joined
Jul 6, 2024
Posts
47
Reaction score
9
Location
wv
First Name
cody
Truck Year
1983
Truck Model
k10
Engine Size
454
Oil pressure sender switch and coolant sender what type of thread sealant to use since your not supposed to use Teflon so it can ground correctly
 
D

dd1990

Member
Joined
Nov 3, 2023
Posts
36
Reaction score
67
Location
Ventura CA
First Name
David
Truck Year
1990
Truck Model
Suburban 1500
Engine Size
350
Ive always used Teflon paste and tape just don't use a bunch...make sure some of the brass is showing
 
DoubleDingo

DoubleDingo

Full Access Member
Joined
Jul 3, 2012
Posts
11,254
Reaction score
17,191
Location
Right where I am
First Name
Bagoomba
Truck Year
1981
Truck Model
81-C20 Silverado Camper Special-TH400-4.10s
Engine Size
Carb'ed Vortec 350
Technically you shouldn't need any thread sealer as the fittings flare out/taper out. So the tighter they get, the wider the threaded area is, and the tighter the fit in the hole.
 
R

Ricko1966

Full Access Member
Joined
Apr 11, 2017
Posts
5,451
Reaction score
8,699
Location
kansas
First Name
Rick
Truck Year
1975
Truck Model
c20
Engine Size
350
wildone454 said:
Oil pressure sender switch and coolant sender what type of thread sealant to use since your not supposed to use Teflon so it can ground correctly
Click to expand...
As @DoubleDingo already pointed out,they are NPT which means they taper and the more you tighten it,the more wedged it becomes. NPT does not have a specific torque,and you don't want to over tighten it,you can actually crack things. It's just snug,plus a little but more if it leaks give it just a little more.
 
Last edited:
Blue Ox

Blue Ox

Turning Diesel Fuel Into Fun
Joined
Mar 27, 2018
Posts
5,221
Reaction score
12,022
Location
LI-NY
First Name
Derek
Truck Year
MCMLXXXV
Truck Model
K20HD
Engine Size
6.2L
Gasoila is the red stuff that's usually used on fuel systems and often shows up on pipe threads on senders. However, it's not exactly in every store.

It's pretty common to use pipe joint compound that can be found in any home store.

Teflon tape is okay if not abused, as others have said. I would not put it together dry and expect the taper to seal it. Plumbers never do that, because tapered pipe thread is one of the $#itiest connections in the universe. It's the household equivalent of TTY fasteners. Getting them to seal involves TTD. Tightening To Destruction.
 
D

Don-T

Full Access Member
Joined
Jul 28, 2022
Posts
65
Reaction score
66
Location
Vermont
First Name
Don
Truck Year
1973
Truck Model
K10
Engine Size
383
I use a bit of PTFE paste but that is from decades of working with stainless steel. Use it sparingly and it will be ok.
 
R

Ricko1966

Full Access Member
Joined
Apr 11, 2017
Posts
5,451
Reaction score
8,699
Location
kansas
First Name
Rick
Truck Year
1975
Truck Model
c20
Engine Size
350
All you need to know,how it works,and how tight,kind of a long read,but good info to know.
www.industrialspec.com

Getting to Leakproof with NPT & NPTF Threads: What Matters

NPT & NPTF pipe threads are almost identical & make solid, tight connections. Find out how they differ, plus assembly tips & insights for leak-free unions.
www.industrialspec.com www.industrialspec.com
 
Last edited:
D

Don-T

Full Access Member
Joined
Jul 28, 2022
Posts
65
Reaction score
66
Location
Vermont
First Name
Don
Truck Year
1973
Truck Model
K10
Engine Size
383
fast 99

fast 99

Full Access Member
Joined
Dec 31, 2021
Posts
2,029
Reaction score
2,938
Location
Spokane, Washington
First Name
Brian
Truck Year
81,85
Truck Model
K20
Engine Size
350
Liquid teflon never hurts if used in the correct places and not over applied. One thing to point out, in an ideal world those fittings may be fine without additional sealers. Problem is we are dealing with mostly used parts and not clean threads.

I have been burned too many times not to add a little insurance.
 
You must log in or register to reply here.

Similar threads

W
454 swap k10 what fittings are needed to install oil pressure sender and switch
Replies
2
Views
374
Ricko1966
R
Doppleganger
Oil Pressure Sender Port
Replies
1
Views
572
bucket
bucket
CheemsK1500
Definitive interchangeable parts thread 73-87(91) (non-drivetrain)
2
Replies
15
Views
4K
CheemsK1500
CheemsK1500
W
Wiring for oil pressure switch sending unit and coolant wiring help
Replies
7
Views
675
dsteelejr
dsteelejr
mibars
Oil pressure sending unit - odd readings (test results)
Replies
0
Views
437
mibars
mibars

Latest posts

Forum statistics

Threads
44,173
Posts
950,832
Members
36,287
Latest member
goodwrenchca
Top