Silicone on pipe threads?

NO FAIR said:

I am debating using silicone on my mechanical oil pressure guage inside my car is that bad? I don't know if I would trust Teflon tape on the inside of the car, the interior will be nice and I sure don't want oil dripping on the inside.
Thanks
Dave

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Doesn't the fitting on the gauge use a barrel compression fitting.

Dan

TRUKPULR said:

Doesn't the fitting on the gauge use a barrel compression fitting.

Dan

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I am using an auto meter braided guage line so I think it is a regular screw on set up.
Dave

I wouldn't use teflon for anything but water.Gasoila and rector seal are good thread sealants for oil,but your gauge should not require it.
Russ

Definitely NOT silicone. The braided line will likely be an AN fitting?? That requires No sealant as it seals on the taper. If there is a taper thread where the adaptor goes onto the gauge it requires sealant like a liquid teflon or thread tape or loctite .

Autometer mechanical gauges have an 1/8th inch pipe thread at the back where you can screw on an adapter for an AN or compression fitting connection. I would probably use teflon tape or pipe dope very sparingly and silicone would probably work fine too. In a perfect world pipe threads would need nothing at all to make them seal when tightened. Just go easy on what you're using so that it doesn't get inside and mess up your new gauge.

Loctite makes a very good product called "Tight" works very well on pipe threads and also acts as a threadlocker. It is an anerobic compound just like regular loctite.

dkp

I'm sure that other stuff will work also however, I use Hylomar, (sparingly), to seal threads into oil or gasoline.

rmcomprandy said:

I'm sure that other stuff will work also however, I use Hylomar, (sparingly), to seal threads into oil or gasoline.

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Yep.. we use Hylomar all the time on the fighter engines

Sticky-as-hell stuff after being heated