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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Thread lock on head bolts?
04-24-2014 12:32 AM  6 years ago
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iflymatt

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Tacoma,WA-USA

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Thread lock on head bolts?
I am putting back together my os 91 hz. Just wondering if I need to thread lock the head bolts. Didn't look like there was any on the bolts when I took them out.
I love flying, I hate gravity.
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04-24-2014 12:33 AM  6 years ago
don s

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Chesapeake, VA

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no thread lockE820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.
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04-24-2014 12:45 AM  6 years ago
co_rotorhead

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Centennial, CO, USA

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don s is correct. Heat will loosen the threadlock and may actually increase the likelihood of the bolts coming loose.
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04-24-2014 12:57 AM  6 years ago
iflymatt

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Tacoma,WA-USA

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Thanks guys.

How about the header bolts? They had red thread on them. But I am wondering if I need some hi-temp stuff.
I love flying, I hate gravity.
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04-24-2014 01:12 AM  6 years ago
Mr.HillBilly

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Salesville, OH - USA

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If you mean muffler bolts, get motor to normal temp and then crank them down and you should be fine.
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04-24-2014 01:16 AM  6 years ago
iflymatt

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Tacoma,WA-USA

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I mean the bolts that run through the engine case and bolt to the header. The pipe itself then attaches to that, the header.I love flying, I hate gravity.
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04-24-2014 01:33 AM  6 years ago
TMoore

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Cookeville, TN

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You could put Brown Loctite on the header bolts and it wouldn't make any difference. Red won't either.

TM
Part 107.
The only ZERO flight hour certificate in the world.
It's like getting a driver's license without the driver's test.
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04-24-2014 01:46 AM  6 years ago
altima1779

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Toledo, oh u.s

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I always used lock washers, tighten down fly a bit to get temps up and re-tighten.
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04-24-2014 02:30 AM  6 years ago
dkshema

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Cedar Rapids, IA

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Head bolts, muffler attach bolts. No. Clean threads, proper torque.-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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04-24-2014 01:44 PM  6 years ago
don s

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Chesapeake, VA

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Anybody ever try Nord-Lock washers on the muffler bolts?E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.
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04-24-2014 02:23 PM  6 years ago
rexxigpilot

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rexxig2@comcast.net

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Nord-lock washers look interesting. I'm not how well they will hold up to the heavy vibrations from an RC nitro motor. I agree with the properly torqued bolt crowd.
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04-24-2014 02:29 PM  6 years ago
dkshema

rrMaster

Cedar Rapids, IA

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Muffler bolts require nothing extra.

Clean threads. Tighten using an allen wrench that fits the socket head bolts well.

Fly.
Land.
Tighten again, while hot.

Do that a couple more times.

The bolts will stay put until you want to remove them.

The best part about this is it is FREE, there are no extra parts to lose, and anyone can do it.

And leave out any muffler gasket material of any kind. The two flat surfaces -- header and exhaust port -- seal quite well all by themselves.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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04-24-2014 11:45 PM  6 years ago
don s

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Chesapeake, VA

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No Nord Locks, more money for nitro.E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.
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