Trojan Boat Forum

Yep I pulled the lower unit on my old outboard motor and am wondering what thread locker and gasket seal everyone uses. I think the thread locker should be one that will allow the bolts to be removed. I also noted a gasket compound on my unit. It is sticky and does help hold the gasket in place. They also used it around a O ring on the water pump. I like the idea and will look for both. Just wondering if anyone has a preference.

No sealer on orings , you can use grease to hold it in place . I also would not use thread locker on the threads unless the book tells you to . If needed then use a weak to med. type like loctite red dont use blue ( heat needed to remove (per loctite )

I agree that the medium or light is the only way to go on the thread locker.
I worry about grease around rubber. I have seen grease used on O rings and the grease does cause the O ring to expand and deteriorate. I do know that not all O rings are made of rubber. I have used grease before on rubber parts and it was a misstake.

Never had a issue with grease on a o-rings on outboards or I/Os , there are places you should not use like in brake systems where they use a different compound o-ring . The o-rings in you case should be ok with oil or grease . Never use a sealer on a oring .

I would not steer you wrong as you know where to find me

Paul, it's probably just the way you typed it out but it's the red Loctite that is permanent and the blue is temporary.

I did get the lower unit back on the motor. I did use grease on the O ring to hold it in place while I put the part on. The surprising thing was that someone had used a gasket material on it before. I was surprised to see it. Now I am looking for a teflon washer for my gearcase lower screw. I believe they used a teflon washer there. I will check with the marina for it. I am actually curious as to what they say they use.

I guess somebody has to be different...I have always used anti-sieze on outboard lower unit bolts, and have not had one come out by itself; but they will still screw out 2 or 3 years later when you want to change that impeller.

anti-sieze and loctite 2 different things

I know. That's the point. Loctite is just what it says....locks the bolt in place. Anti-sieze makes it easier to get out next time without wringing the bolt off. Why would you want to put loctite on bolts that tend to be 'locked in place' by corrosion? If you ever have to drill out one of those buggers you'll never think about putting loctite on them again.

Silicon/teflon grease is the ticket as it does not attack the orings.

Larry X2, Silicon

There are many different type oring-s for different uses , made to resist different things , in this case they would be grease/ oil resistant . but in other cases greases or silicones can cause issues .

I found my teflon seal at a marine place on Mcmanus Blvd. The handle Johnson motors. It looked like plastic to me but probably is the right type for thye engine. I took the boat for a run up at Yorktown and it ran very well. Now I have to check the lower unit to make sure there is no water in it.
Thanks for all the good answers. I always have room for more information. Learning is a never ending process.