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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › muffler keeps on breaking bolts!
01-19-2010 01:34 PM  8 years agoPost 1
RAVVEN

rrNovice

Rustenburg, South Africa

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OS 50 hyper with align Muffler, I eventialy stiped the thread on the muffler,now im using same bols/nuts of the CY pipe to secure muffler, but it keeps on breaking, tried some epoxy (gasket) but exhaust kept on leaking, now I`m using black gasket maker witch seals the muffler, but bolt wise It doesn`t stick, can the engin/muffler hole be drilled bigger to accomodate `n larger bolt?

ABC- Always Be Controling!!

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01-19-2010 02:14 PM  8 years agoPost 2
RAVVEN

rrNovice

Rustenburg, South Africa

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Bolt= 3mm * 45mm

ABC- Always Be Controling!!

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01-19-2010 02:25 PM  8 years agoPost 3
jschenck

rrProfessor

La Vista, NE.

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are you putting a washer on before the locking nut?

Also grind the muffler flange so the nut will be flat against the flange. Use a Dremel to cut it flat.

I've had many mufflers with long bolts and nuts on the end and they do not break. you need to have the muffler face flat where the nut meets the flange.

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01-19-2010 02:43 PM  8 years agoPost 4
Smok

rrApprentice

Antwerp, Belgium

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Are you using Loctite to lock the nuts ? The red one might be better
if the muffler gets very hot. I would also seal the gap between motor
and muffler with a very thin brush of hi-temp silicone.
Finally, aluminium expands much more than steel in high temperature,
so I would pay attention not to fasten the screws too tight
as otherwise they might break when the muffler gets very hot.

Also nuts with polyamide inserts would not be good for this,
as the polyamide would get soft and would loose it's friction
when it gets hot from the metal of the screw.

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01-19-2010 02:47 PM  8 years agoPost 5
Damper

rrVeteran

Point Blank TX USA

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^+1 jsk. I had the same problem with align bolts on the muffler. To add just make sure u clean the gasket form off both the engine and flange of muffler.

Full Throttle Spooning Leads To Forking

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01-19-2010 02:49 PM  8 years agoPost 6
SteveH

rrProfessor

Texas

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Classic problem caused by excessive clutch runout. I'd pull the engine and check the runout at the clutch with a dial indicator.

The government cannot give you anything without first taking it from someone else.

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01-19-2010 02:51 PM  8 years agoPost 7
Smok

rrApprentice

Antwerp, Belgium

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Just to add one bit, I am using flanged nuts for the muffler
connection - that is not absolutely necessary but it still
helps a bit to prevent the nuts from undoing from vibration.

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01-19-2010 02:56 PM  8 years agoPost 8
jschenck

rrProfessor

La Vista, NE.

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Clutch runout -good suggestion! I always check my clutch and get it inside .002", try for less than .001" runout. Makes a difference for sure.

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01-19-2010 04:27 PM  8 years agoPost 9
Howrad

rrNovice

Pine, Colo.

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Where can a guy find the longer bolt & nuts? thanks in advance

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01-19-2010 05:08 PM  8 years agoPost 10
wifeorheli

rrElite Veteran

reno, nevada usa

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pretty sure steve hit the nail on the head. I have a frenzy with bad runout shook the muffler so bad the baffel inside broke loose.

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01-19-2010 05:12 PM  8 years agoPost 11
RappyTappy

rrProfessor

Traveling the USA

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balancing is becoming a lost art these days. When I talk about balancing things to some guys at the field, they look at me like

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01-19-2010 05:22 PM  8 years agoPost 12
fla heli boy

rrElite Veteran

cape coral, florida

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yep. I go back to the day when we built/balanced our own wood blades.
Clutches that "hard Bolted" to the fan, then have to tweak a thousand times to get the run out right on the start shaft, etc. Stuff today is so much nicer, well made and precise, but it always bears checking IMO.

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01-19-2010 07:28 PM  8 years agoPost 13
Raptor Pilot

rrVeteran

Northern Ireland U.K

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Ravven, if your 3mm bolts on the muffler are breaking then there is a high frequency vibration in the heli and as has been said here it is most likley the clutch. I started flying in the days were you had to add your own lead weights, balance your blades and cover them etc, etc. I still balance everything and it does make a smother, longer lasting heli. Dont get me wrong, modern helis are real good balance wise but you still get the odd one that needs a tweek.

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!

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01-19-2010 11:31 PM  8 years agoPost 14
Dirthead

rrApprentice

Thornton Co.

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Looking at that last pic of the exhaust port could there have been a crash in the past that bent or broke a previous pipe? Only reason I ask is the face of the port looks "how shall I say?" not flat any more, posibly causing a flat new pipe to not be able to seat up to it. This being why it leaks and vibrates the bolts into submission.

Keep ur head out the dirt only in the grass

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01-20-2010 01:34 AM  8 years agoPost 15
airdodger

rrElite Veteran

Johnston USA

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Unless you are using castor you should think about opening the needle some, that can also lead to loose bolts and plugs. Also don't overtighten the bolts if you do they won't be elastic anymore.

Chris

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01-20-2010 01:45 AM  8 years agoPost 16
JeffKollin

rrKey Veteran

Jenison, MI

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Just snug the bolts and then fly the heli and get everything up to temp and then retighten the bolts but do not over tighten.That way when everything expands it does not over expand to the point of putting excessive pressure on the bolts and snapping.

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