Where do you use blue (releasable) Loctite if at all? Muffler and Carb ? Motor Mounts etc? Where?

Anywhere subject to vibration; and you may want to take apart later.

Used it on the muffler on my Saito FA-180 4 stroke, a brute of an engine. Holding well.

On gaser or. Big engines every thing except servo

The guys are right and thats Loctite 242. For things like EZ-Links, wheel collars etc, I us the green, Loctite 290.

I forgot I picked up the JB Weld Perma-Lock from Menards... It's the medium strength, is it about the same thing? They didn't have Loctite.
Says it's temp resistant to 300 degrees.. Will that still work on a .42 sized engine?

Just me Bill, but I don't use thread locking goop on an engine unless I need it and so far I haven't. But I only use four strokes that have a different muffler mounting set up than two strokes. And far anything as any thread locking compound marked as "Permanent" for two stroke muffler mounting, I wouldn't use it. Steel screws going into aluminum, thermal coefficient's, not good. Your better off using an anti seize compound with the proper torque applied than using a thread locking compound.

Thanks Gary... I don't think that it is exactly Permanent...? It's the medium and says removable on the little bottle <a href="http://www3.towerhobbies.com/cgi-bin/wti0001p?&amp;I=LXAVKJ" target="_blank">www3.towerhobbies.com/cgi-bin/wti0001p

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On all my gas models I use red locktite on exhaust bolts/nuts and everywhere else I use blue.

Karol

The only glow engines I have ever used it on was the OS .46 LA engines. The head is held on with 4 long screws. After three of the LAs head screws backed out during the run in I used the lock tite on them. I pulled each screw and cleaned the screw and threads in the engine with acetone then used a drop of lock tite on the screw threads. Let the engines stand over night before I fired them up. That seemed to do the trick.
Other then those engines and threads I have never used it on any engine, RC engine! I go the other way and still have an 8 ounce bottle of Anti Seize and use a little of it on all the engine screws during a rebuild. For headers that come loose I run the engine until hot then re tighten the locking nut on the header and muffler. I have had headers break but never just come loose.
I do lock tite motor mount screws that go into blind nuts and use fiber lock nuts on most others.
Once upon a time I removed the aluminum threads that got stuck to the steel screws when using lock tite, that's when I started using the anti seize on anything that used steel screws going into aluminum threads.
As an RC engine re builder I run into head screws all the time that are one jump from impossible to remove that lock tite was used on. Removing them is a true thrill.

I agree a 100% with Gene on the anti seize. Not only does it help against galling, it also helps to protect against galvanic reaction and electrolysis. And those split lock washers? They don't work very well in my testing at work. If you have trouble with screws backing out, I would suggest to never put loctite on the threads of an engine. But if you still have screws coming loose, use the anti seize on the threads, and apply a small amount of the permanent type of thread locker like Loctite 290 under the head of the screw and on the mating surface. You can do that after the screw is tightened, it will get in there and you will still be able to remove the screws.

At work we use Loctite 290 to hold the outer race of bearings with only 0.0002" clearance.

I'm sure if you go to the Loctite website, it will tell you what each type is good for. I've used the 242 (blue) on muffler nuts and bolts, the green on smaller hardware (#2), but I've only used the red on things I don't want to take apart again! Follow their directions, they are worth reading. Loctite holds up to muffler temps very well, but keep it away from plastic.

I agree with anti seize on where there is heat,I use clear silicon on some stuff that mite vibrate it turns to rubber and does not let stuff unwind but parts unscrew without wipeing out the threads.

Do not use red loctite on a glow engine. It will take the threads out.