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Thread sealant

Posted: Wed Apr 10, 2013 1:54 pm
by jms02050
Swapping out my Raymarine autopilot pump (M81120) and the instructions call for "pipe sealing compound". Called Raymarine asking for a recommendation but they were no help. As is often the case, a web search leads to info overload. Loctite, Permatex, etc? I know it needs to be compatible with hydraulic fluid. Anyone know of something readily available that can be found at most stores?

Re: Thread sealant

Posted: Wed Apr 10, 2013 5:17 pm
by marko
Don't know exactly what you're doing, but do know there are variations of Permatex. Been told to use nickle based Permatex vs standard, which I think has copper. This is from a Cummins mech for the brass pencil zinc holders. Had to order it.

Re: Thread sealant

Posted: Wed Apr 10, 2013 6:11 pm
by jms02050
Just trying to identify the right pipe thread sealant for the metal fittings that attach the hydraulic lines to the autopilot pump. Here's a pic of the fittings. Thinking pipe dope with teflon...
IMG_1237.jpg

Re: Thread sealant

Posted: Thu Apr 11, 2013 7:32 am
by jleonard
Where I worked last we used Loctite 242 or 272 on pipe threads when we could because they would never leak with that on them.
Everything else would leak from time to time, but not with loctite.
And we assembled thousands every day.

Re: Thread sealant

Posted: Thu Apr 11, 2013 2:57 pm
by RobS
I use RectorSeal 5 on all threaded fittings (fuel & hydr.) and hoses/hose barbs. Have used it on 2 autopilot pump installs, steering cylinders, etc. Never an issue. Available at Home Depot, hardware stores and the like.

Re: Thread sealant

Posted: Thu Apr 11, 2013 3:08 pm
by RobS
Here is the data sheet

Re: Thread sealant

Posted: Thu Apr 11, 2013 4:24 pm
by jms02050
Thx Rob. I've also heard of many people using Loctite 545 - expensive stuff, hard to find, but supposed to also work well.

Re: Thread sealant

Posted: Fri Apr 12, 2013 10:13 am
by ScubaPete
I will vouch for the Rectorseal #5. It doesn't leak. It makes removal of hoses and fittings much easier in the future as well.