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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Nylock nuts melting.. muffler pressure nipple seems leaky
05-08-2013 07:46 PM  6 years ago
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coolgabsi

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Plano TX

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Nylock nuts melting.. muffler pressure nipple seems leaky
OK .. my engine is OS55hz, Muffler is Funtech B320.

I had heard about the Funtech pipes being notorious about having the bolts come loose without nylocks. A friend actually took the threads out for me, so I could install a gasket on the port, and then nylocks holding the muffler.

Now the BOTTOM muffler bolt seems to be melting. Its a brand new nut, I changed the engine bearings, and I saw no sign of lean engine per say, but I replaced the prevously molten bolt.

SO new bolt and one tank and its already crowned. Its got white stuff crowned up on top ..(hopefully you can tell in the pic) .. I flew it, came down, retightened everything.. still I wanna be sure that it wont come loose on me.

Second thing:

Muffler pressure nipple seems to be a source of all the leaks I am seeing on the muffler. At first I thought it was from the muffler port, and tried to retighten that.. but they were tight as could be, and the align gasket was still there in the middle.

Now I took the one it had out, and put one from my Funtech 395 on this. It seemed to still have a leak around it, and just like the other stains, it was travelling down with a similar size drop.

My issue is .. HZ engine needs the muffler pressure.. I dont want to burn this engine. .So need advice.. I am thinking metal to metal gasket (silver blue loctite stuff) around it and threading it back in, and letting it sit.. so it would seal it?????????????? Sound ok ? or no?

are there qualities of nylocks ? I had this from I think a a traxxas pack of nylocks. Is there a specific type I am looking for. I have never before seen a molten nylock on the nuts... but here I am ..

Please help and advice
thanks!

People call me crash master... for a reason.. :P :D
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05-08-2013 08:00 PM  6 years ago
d_wheel

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Deep in the heart of Texas.

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I've had a couple of engine/muffler combinations that seemed to always vibrate loose. The answer was to use bolts just a few mm longer and install a lock nut. In your case, that would be 2 nuts on each bolt. Tighten the first as you normally would and then tighten another against the bottom one by placing a wrench on both. Really tighten the second one very hard against the first. Never had one come loose after I started using this method.

Later;

D.W.
Gettin old aint for sissies!
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05-08-2013 08:01 PM  6 years ago
Wedge77

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St. Charles Missouri USA

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Im sure youll get a dont listen to this guy but here go's, go get some anoraberic sealer, (I think thats how it is spelled) put out by locktite, it is a gasket eliminator,
ditch the gasket you are using, put sealer on muffler flange, making sure it is clean and engine flange is clean,
drill through muffler holes so your bolt go's through,
run a coat of that sealer arounf the muffler flange, put a good amount on it , it'll press out but it wipes right off,
put muffler on, run bolts through, put a flat washer on before the first nut so it locks down easier, and put two nuts on each bolt, locking the second against the first after you tighten the first down good and snug. wipe of sealer and fly, you will never have to worry about it again, and when you need to tear down, the muffler comes right off and the sealer wipes away. I used to use this on sealing jet ski engines that dont have a gasket between the cases, and it works WELL. if you want you can put blue loctite on the nuts, but since you are going to use two, locking them together it rerally isnt needed.
Gary

also, use a little jb weld on the pressure tap, itll stay put and never l;eak again
JR NEX E8, 12 cell
Goblin 630, 12 cell
Vibe 50N Fbl
Century E640 Fbl, 12 Cell
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05-08-2013 08:01 PM  6 years ago
Wedge77

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St. Charles Missouri USA

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dwheel, you beat me too it LOLJR NEX E8, 12 cell
Goblin 630, 12 cell
Vibe 50N Fbl
Century E640 Fbl, 12 Cell
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05-08-2013 08:10 PM  6 years ago
coolgabsi

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Plano TX

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Ok I can do that..

Now will Autozone or similar carry that sealer?

Another question.. Never liked JB very much. can never get it to bind right for me. Can I use the same sealer on the nipple too ?

Or that silver blue metal to metal sealer ?? ( dont know the name.. is that the same thing as what you just said ? ))

My co worked told me about it, I am just wondering if both of y'all are talking about the same thing.. he said its Silver color or silver based or something.. found in an auto store.

The holes in the muffler are already drilled through.. So there is no threads there..
People call me crash master... for a reason.. :P :D
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05-08-2013 08:30 PM  6 years ago
Dyehard

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Cedar Bluff, Va.

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Forget about anything else but JB Weld on the muffler pressure tap. The muffler gets so hot that hardly anything else but JB Weld will stick. Clean the area around the pressure tap with some sandpaper, about a 3/8 inch radius will do. Clean the pressure tap with some lacquer thinner, use the same thinner to clean the area you sanded on the muffler. Put a little JB Weld on the threads of the pressure tap and screw it in, then build up a fillet of JB Weld around the hex part of the pressure tap. Let dry over night. I've got a few mufflers that had the tap glued in with JB Weld over ten years ago and they are as sound as the day I put them in.Allen Dye
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05-08-2013 08:33 PM  6 years ago
coolgabsi

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Plano TX

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ok

cool.. Good to know .. what about the sealant that is talked about above.. any idea where to find that?

Thanks1
People call me crash master... for a reason.. :P :D
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05-08-2013 09:18 PM  6 years ago
BeltFedBrowning

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Kansas City

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I would use the high temp stuff on a muffler flange. One tip is don't get it in your eye! It contains acrylic acid.
http://www.oreillyauto.com/site/c/d...N2362&ppt=C1984

When using an anaerobic sealant, an important thing to remember is the term anaerobic. It dries in the absence of air. If you apply a 1/4 inch bead to the surface, 99% of it will get squished out. Only the portion that is trapped between the muffler mating surface will dry. A film the thickness of a human hair one one surface is plenty.
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05-08-2013 10:14 PM  6 years ago
MartyH

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USA

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They make metal locknuts. You can also use jamb nuts. Replace the gasket with #2 Form-A-Gasket.
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05-08-2013 11:16 PM  6 years ago
RPM 1.5

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Cape May New Jersey

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Permatex in copper colored tube =DONE !!!!!!!!!

EASY AND CLEAN but only use small amount on both ends with finger tip and double nut it all better then

Ray
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05-08-2013 11:47 PM  6 years ago
coolgabsi

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Plano TX

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Well darn it ... Just picked this up

Closest thing I could find

Y'all telling me it won't fly... ?

lol

Let me know so I can return it

People call me crash master... for a reason.. :P :D
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05-09-2013 12:37 AM  6 years ago
coolgabsi

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Plano TX

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Ok

So read up on the red rtv stuff and decided to not use it.. Got these two lol

Anaerobic was found finally with someone in a remote shop. Don't know why the stores here didn't have it

Anywhew ... So what's better?

People call me crash master... for a reason.. :P :D
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05-09-2013 12:45 AM  6 years ago
RPM 1.5

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Cape May New Jersey

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HA 2nd pic NICE !!!!!!!!!!!!
COPPER ONE

THAT THE STUFF= but remember just use a little and then tap finger around all edges on both sides to leave just a little on both sides THEN make sure everything tight when putting back together,after a short flight maybe double check bolts and tighten up again then you should be GOOD !!!!!!!!!!

IF you put to much on the HTV it can destroy glow plug
That why you only use a little and tap finger to get rid of extra
BEEN DOING THIS ON EVERY MUFFLER

Ray
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05-09-2013 01:08 AM  6 years ago
MartyH

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USA

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You really don't want to use any kind of silicone sealant. #2 Form-A-Gasket from Permatex has held up to the heat and oil for me for years and is not silicone based. Silicone, even a slight sliver will kill a glow plug in short order.

In regards to the muffler nipple, you can degrease the heck out of it and the hole and then JB Weld the nipple in with a small application of the epoxy. JB Weld also holds up well to this level of heat and oil.
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05-09-2013 01:37 AM  6 years ago
Flau

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Curacao

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muffler sealant
Hi coolgabsi,

Because your muffler came loose, the flange isn't flat anymore.
You HAVE to make it flat again if you don't do this it come loose forever!
Put a peace off sanding paper (800) on a flat surface and slide it over it. You can see what you remove.
I olso glue the muffler with epoxi or JB weld or endfest 300.
But let it hardened for 24 hours.
It never leaks anymore.

Best regards,
Frans.
TT G4, YS 96/120 srx, Beastx, cgy750
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05-09-2013 05:04 AM  6 years ago
Nasty1

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Enf,Ct-USA

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+ 1 on the jb weld
I use electrical motor cleaner to clean off the oil. And a razor blade to clean off any high spots or old jb.

Don't use the quick jb. Use the standard stuff
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05-09-2013 11:09 AM  6 years ago
1heliman

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us

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forget using the the nylock nuts. Just use the red rtv gasket material for a gasket and use lock washers on the bolts. You'll never have a problem after that!
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05-09-2013 06:00 PM  6 years ago
Andy from Sandy

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Bedfordshire, UK

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forget using the the nylock nuts.
He has to use locking nuts of some sort as there is no threads in the muffler.

I use the aerotight locking nuts as they don't have nylon that melts.

http://www.fastenright.com/All-Meta...TIGHT-NUTS.html
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05-09-2013 06:10 PM  6 years ago
1heliman

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us

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Andy,

I understand that, He needs to use the the lock washer between the nut, (a regular nut with no nylon in it) and the muffler bolt. Nylon nuts have their place, but high heat applications are NOT one of them.
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05-09-2013 06:16 PM  6 years ago
Andy from Sandy

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Bedfordshire, UK

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and use lock washers on the bolts.
No mention of nuts which is why I recommended the aerotight nuts. They work very well and can be used in high temperature applications.
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