Exhaust bolts, muffler to cylinder, locktite?

[redoakneck]

Who uses what to keep these dang things from coming out???

Also, stripped a 346xp muffler bolt hole on one side, going to tap it one size bigger now, might as well do both sides.

 

[Zombiechopper]

loctite is defeated by heat. I'm sure there is a type of thread locker that would take heat, but I bet it's permanent.

try a wrap of teflon tape on the threads. ONE thin wrap.

 

[Zombiechopper]

lockwashers are a thing nowadays too

 

[Lone Wolf]

Who uses what to keep these dang things from coming out???

Also, stripped a 346xp muffler bolt hole on one side, going to tap it one size bigger now, might as well do both sides.

I do. It must help cause I dont have as many fall apart as I used to.

 

[Lone Wolf]

loctite is defeated by heat. I'm sure there is a type of thread locker that would take heat, but I bet it's permanent.

try a wrap of teflon tape on the threads. ONE thin wrap.

http://www.loctite.co.uk/loctite-4087.htm?nodeid=8802623717377
It works to 400 degrees.

 

[Zombiechopper]

I found conflicting temps listed. Regular red has an operating temp of 65-300F. High strength red has an operating temp of 65-450F. But then I found other sources that say it releases at 500F.

How hot does a saw cylinder and muffler get I wonder? Anyone have one of those laser thermometers?

 

[mdavlee]

Never been able to get down to a muffler flange. I've seen over 400 on the cylinder fins after a milling cut.

 

[R2D]

Permatex® Surface Insensitive Threadlocker BLUE

Oil resistant!!!!! Use that chit on every bolt not just saws

-65f to +300f

 

[bikemike]

Red loctite it has served me well for exhaust bolts

 

[hseII]

Who uses what to keep these dang things from coming out???

Also, stripped a 346xp muffler bolt hole on one side, going to tap it one size bigger now, might as well do both sides.

Loctite?

What's that?

Oh Yeah...

#KeepsHuskysRinnin'

 

[hseII]

Never been able to get down to a muffler flange. I've seen over 400 on the cylinder fins after a milling cut.

I honestly Think the "High Temp" is sufficient for this application.

 

[mdavlee]

Red seems to be fine

 

[super3]

Loctite 246.
Medium strength, high temp.

 

[Genius]

Permatex® Surface Insensitive Threadlocker BLUE

Oil resistant!!!!! Use that chit on every bolt not just saws

-65f to +300f

This is what I use on everything. I have yet to loose a fastener.

 

[38f20]

Replace them with stihl screws, not sure the heads would fit tho.

 

[R2D]

This is what I use on everything. I have yet to loose a fastener.

After I figured out I really like this stuff, I bought the big bottle. Now it goes with me on my all my jobs as well.

 

[CR888]

I have had more problems with muffler bolts siezing than falling out. I use high temp copper/zinc base lube >1200° as soon as any new/old saw comes into my possesion. Often I am removing mufflers to clean exhaust ports and mufflers or checking piston/rings. The last thing I would want is a loctite type product that sets and gunks up. But I do what I do and you may view things different if you are loosing bolts etc. I have come across some pretty stiff muffler bolts on low hr units, removing the bolts is more important 'to me' than keeping them secure.

 

[Al Smith]

Serrated "belleville "type washers like Stihl uses on the 200T's . McMaster Carr has them by the ton .The Stihl dealer would too just take a ton of money with you .You might try Northwood saw ,that guy has all kinds of goodies.

 

[redoakneck]

Thanks for all the replies, I have done 30+ saws and not used anything, now 2 in a row???


Now I'm nervous about all the sawz I have fixed for friends


I like the shorter bolts that go inside the muffler, only the head is sticking out past where it holds the muffler on, the long ones like on 346 I would think vibrate from engine resonance more due the whole shaft being inside the muffler

 

[Al Smith]

Not to sound like a smart azz but this is part of what I do for a living regarding threaded fasteners .To get max holding power it takes at least 4 times the hole diameter in depth in aluminum,2 in cast iron and one it steel . A properly torqued threaded fastener,lubricated is almost impossible to loosen up .More failures occur from under tight than slightly over tight .The dished bellevile washer allows for some expansion .Then again tight is tight too tight is broken .