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HelicopterHIROBOOther › Evo fan nut keeps coming loose
10-18-2004 10:51 PM  13 years agoPost 1
HawkNoob

rrVeteran

Pa

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This will be the 2nd time I have to remove the engine as the fan nut keeps coming loose. I used locktite on the crankshaft threads and a crankshaft lock tool to really snug the nut down. Why does it keep coming loose?

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10-18-2004 10:54 PM  13 years agoPost 2
Ross R

rrVeteran

Rochester NY

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a. crankshaft not clean
b. not enough loctite
c. not tight enough, I use a large rachet

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10-18-2004 10:59 PM  13 years agoPost 3
z11355

rrMaster

New England

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as Ross said. One or more of those possibilities.

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10-18-2004 11:10 PM  13 years agoPost 4
l337hxr

rrApprentice

Irvine, CA

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You could try one of my suggestions as I told SPB. and that was to put a big nyloc nut on it. Nyloc are generally harder to back out. This is why you're not supposed to use loctite with them.

SceaduEvo50, FF9

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10-19-2004 01:57 AM  13 years agoPost 5
reloader

rrNovice

Baton Rouge, LA US​of A

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Loose Nut

Well, I've experienced the same problem, under the same conditions (loctited, pretty tight, etc). I searched RR and found that what was probably causing MY problem was the fact that I allowed fuel to back out of the tank vent into the muffler/into the engine. This created a hydraulic lock that allowed the starter to spin the clutch/nut instead of the crankshaft, which broke loose the nut and locked up the whole deal. This, of course, necessitated pulling the engine & re-doing the whole shebang.
When I became more careful while pumping in the fuel and then made sure I could turn the engine over at least one revolution by hand before hitting it with the starter, my problem ended (knock on wood).
You may be experiencing the same thing.....

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10-19-2004 01:57 AM  13 years agoPost 6
YSRRider

rrElite Veteran

usa

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clean the threads good! run the correct die/tap through them if necessary to get rid of the old loctite. then use a tooth brush to lock the crank either through the back plate or through the carb hole and use RED loctite and allow it to setup over night before flying.

and..... have another person help you lock the nut down, it always helps to have someone hold the motor while you hold the fan and crank the nut down! B carefull not to break fins!

and if you have to remove the fan later you will have to use a small torch to heat up the nut to melt the loctite and i used an impact gun to get the nut off.... piece of cake!

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10-19-2004 02:01 AM  13 years agoPost 7
z11355

rrMaster

New England

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you dont need red loctite.

clean the threads and nut WELL

get a good lock (like the Delrin crankpin lock).

blue loctite

use a rachet (3/8" drive) and put some muscle
into it.

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10-19-2004 03:46 AM  13 years agoPost 8
HawkNoob

rrVeteran

Pa

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I probably did hydrolock it a few times as I remember seeing fuel in the muffler line and did not bother to check if it was flooded or not but just hit it with the starter. The engine is still new and running rich so it backfired a few times too. I'll have to check it before hitting it with a starter from now on. On the positive note, I am getting very efficient at taking the engine out!

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10-19-2004 03:54 AM  13 years agoPost 9
HawkNoob

rrVeteran

Pa

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Would a YS checkvalve be a useful in preventing the fuel from going to the muffler if I put one on the muffler line?

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10-19-2004 11:30 AM  13 years agoPost 10
reloader

rrNovice

Baton Rouge, LA US​of A

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I thought about a check valve, too, but how is your tank going to vent if you have a one-way valve that only allows air flow INTO the tank? You'd have to take it loose to fill the tank (which might not be a bad idea anyway, at least till you see if that's the problem cause). If you take it loose, then it really serves no purpose!!
Really, I think that if you loctite it correctly (clean, etc) and pay attention to the fueling process and check for liquid in the engine prior to starting, you won't have any more problems!
Good luck!
Dave

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10-19-2004 02:37 PM  13 years agoPost 11
Reefer

rrApprentice

ShaTin, Hong Kong

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Can I just use double nuts there?

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10-19-2004 03:49 PM  13 years agoPost 12
reloader

rrNovice

Baton Rouge, LA US​of A

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I don't think you have the room to double-nut the fan, plus it really isn't necessary if you do things properly

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10-19-2004 07:02 PM  13 years agoPost 13
HawkNoob

rrVeteran

Pa

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I thought about a check valve, too, but how is your tank going to vent if you have a one-way valve that only allows air flow INTO the tank?
I have a quick UK header tank which has 3 outlets on it, one of which is used as a vent and a filler line.

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10-19-2004 07:09 PM  13 years agoPost 14
soundbwoy

rrApprentice

Fort Lauderdale

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You might also want to wait 24 hours before flight so the loctite can cure that always works for me.

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HelicopterHIROBOOther › Evo fan nut keeps coming loose
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