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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › OS 55 HZ rebuild tips
06-09-2012 04:32 AM  6 years agoPost 1
Tbird

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Indiana

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I am going to try to replace the bearings in my OS 55 HZ, I believe they are shot since the motor rattles very loud and kills glow plugs.... anyways would like some tips on how to replace them... should I replace anything else why the motor is apart.

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06-09-2012 05:31 AM  6 years agoPost 2
HotsHabit

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Idaho

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It all depends, did you catch it in time before the piston and liner got scratched up? If the internals got torn up then you had better replace the ring at the minimum and hone the cylinder, just depends on if it got damaged and how bad it is. If it didn't get damaged but it has a lot of time on it then you might want to at least re ring it and hone the cylinder just enough to remove the glaze. If its fairly new with no damage then just change out the bearings or go to the bushing.

I don't change bearings anymore, I send my motors to Magnum Fuels and have the bushing put in and forget about it. i didn't even start up my new 55 before it got sent to Buzz for the bushing.

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06-09-2012 05:38 AM  6 years agoPost 3
Tbird

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Indiana

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I have not tore it apart yet it still runs just noisy, and seems to kill glow plugs.... Don't know the cause of that but I assume its bearings still has great power ect..

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06-09-2012 05:42 AM  6 years agoPost 4
HotsHabit

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Idaho

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If its rattling at all dont run it anymore. Its probably killing glow plugs because the bearing and race particles are wiping out the wire meaning the odds of a scored cylinder or liner is pretty good.

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06-09-2012 05:43 AM  6 years agoPost 5
Tbird

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Indiana

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Damn so what should I do? Is it worth repairing?

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06-09-2012 06:08 AM  6 years agoPost 6
HotsHabit

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Idaho

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You never know till you take it apart, it could be fine and just need bearings/bushing.

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06-09-2012 06:36 AM  6 years agoPost 7
HotsHabit

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Idaho

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I found you these videos to help you out........pretty easy to do:

Watch at YouTube

Watch at YouTube

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06-09-2012 08:17 PM  6 years agoPost 8
Tbird

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Indiana

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Well I bought bearings gonna give it a shot in the next few days!!

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06-10-2012 02:40 AM  6 years agoPost 9
utahbob

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St. George Utah

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bearings
I've posted on this before--but I have had great sucess for years now by after a flying session--within 3 hrs. I remove the glow plug and rinse the element off with raw fuel (no castor); then I remove the bottom plate and rinse the brg. with raw fuel and dry it out by sticking a paper towel up in there; then I use a squeeze bottle out a few drops of after run oil on the bearing--I make my own blend 50% atf and 50% Marvel air tool oil (I didn't think this up--a wise old pylon racer guy told me to try this yrs. ago) try to get at least a drop on each ball and rotate the crank around with your finger--you just need a little bit in there--you don't want any getting into your carb so don't leave the bird upside down too long; then stick a paper towel up in there and let the excess get wicked up--after awile--1 hr. take the paper towel out and put a dry one in (a half a sheet is just right)--I leave my backplate off until my next session--it seems to keep any moisture from causing a problem--when you go to fly the next time you can rotate the crank with your finger to feel & see how your brg. is doing befor you fly--I've had great sucess doing this with all kinds of brgs. believe it or not I ran one of my 50 hypers for 2 yrs. and four months on the same set of brgs. and top end--the brg. was still smooth and clean but was very loose so I don't recomend trying to go that long--usually I get about a year on a top end and brg. set and that's fine--I also mix some castor in my fuel--alot of guys frown on that--I mix 1 1/2 oz. per gallon I believe it really factors in on the longevity of all the things that rub together in there! I've been using castor for 7 yrs. in heli engines--I've never had any parts get sticky or have any other problems with it--just a few brown spots on the bottom of my muffler--give this a try--it really is no big deal to do and gives you a chance to look over your machine--and you might spot something that needs attention B4 your next session--sorry this turned out to be a short novel but I hope you can get alot of flying out of your bird--I do fly alot--I have a 600 that I have 300+ flights on.

I do a great decending funnel!

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06-11-2012 08:00 PM  6 years agoPost 10
BladeStrikes

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Shelby TWP,Mi

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Heres videos I made which are for our heli motors..

Watch at YouTube

Watch at YouTube

Watch at YouTube

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06-11-2012 08:05 PM  6 years agoPost 11
bart2546

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Canal Winchester, OH - USA

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+1 on the Magnum Fuel bearing/bushing modification. I'm hoping they're at IRCHA again this year and I will have it done for sure this year. I should have done it when I bought the motor while at IRCHA last year and didn't.

Regards, Brandon Bartolomucci; Team Synergy; Team Scorpion; & Team Bavarian Demon; AMA# L939231

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06-11-2012 08:05 PM  6 years agoPost 12
HotsHabit

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Idaho

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The first and third are showing as broken for me.

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