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HelicopterEngines Plugs Mufflers Fuel › OS 50 Bearing Questions
05-01-2004 06:48 AM  13 years agoPost 1
tabbytabb

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seattle

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Hey guys had a few quick questions regarding my OS 50 and some problems I had recently. I got back from a month long vacation and went to take the raptor out for a spin. Got to the field fired it up and it sounded like my chainsaw

I pulled the backplate and can see where the conrod was hitting it. Pulled the engine apart today thinking the rear bearing was toast and to my surprise it doesnt look too bad. Does have a little more play than I thought it would, but since I dont have a new one to compare it to it is hard to tell how it should feel. This is my first nitro heli so I dont have much of a feel for this kind of stuff yet.

So my question is what happened?? What caused the conrod to hit the backplate, is my bearing likely toast and I just cant tell?

Heli has webbing partially removed and I am not sure of the runtime on the engine as I bought the heli used

Thanks for any input

Tabb

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05-01-2004 12:03 PM  13 years agoPost 2
Ben-T-Spindle

rrProfessor

Central Illinois

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It’s not fixing the OS50. OS really needs to fix all the problems with this engine.

I now use the TT50 – it costs much less and lasts longer.

... BTS

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05-01-2004 11:46 PM  13 years agoPost 3
2LTime

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Walworth,NY

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The con rodwillhit the backplate a little. It can shift on the crankpin a little and will lightly rub the backplate. If it's rubbing more than that, make sure your fan hasn't loosened up slightly. If it unscrews slightly it could cause excessive rubbing because the crank won't be pulled forward.

As as play goes,the crank shouldn't really have any playat the rear bearing.

Jeff

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05-03-2004 07:05 PM  13 years agoPost 4
w.pasman

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Netherlands

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Normally hitting of the rod with the backplate should not make such a sound. Did you check if the fan is tight?
A bad bearing causes a rattling/sizzling noise, not like the chainsaws we have here

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05-03-2004 11:57 PM  13 years agoPost 5
tabbytabb

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seattle

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Fan was tight, I think the bearing is the culprit. It looks OK but has quite a bit of play. I will replace it and see how it goes. Also my rod was rubbing the backplate more than just a little. there is quite a mark on the backplate. Why if the fan is tight would the rod rub so bad, is the rod just plain worn out??

Thanks for the help

Tabb

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05-04-2004 01:07 AM  13 years agoPost 6
2LTime

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Walworth,NY

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Ray, I think you wanted to remove my "backplate" to cure a "rubbing problem".

If the fan is tight, make sure the rod bore is tight around the crank pin. If the bearing let that much play in the crank, than possibly this could be your problem.

Jeff

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05-04-2004 02:24 AM  13 years agoPost 7
tabbytabb

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seattle

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Thanks Jeff, That is kinda what I was thinking. Bearing play caused it all.

Tabb

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05-04-2004 02:27 AM  13 years agoPost 8
rickc

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Creve Coeur IL. (Peoria Area)

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Tabb,

Do the crank mod and put in some new Boca's, you'll be right back in shape. You can get a PowerPoint file for the mod off my homepage.

Rick

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05-04-2004 02:45 AM  13 years agoPost 9
tabbytabb

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seattle

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Rick, Crank mod was already done, Thanks for the advice though

Tabb

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05-04-2004 02:49 AM  13 years agoPost 10
Doug

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Port Saint Luice Florida....

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If the fan backs off it can force the crank "aft" which will rub the back plate. If you want to check the bearing clean it with solvent and dry it then spin in you fingers if it has even the slightest roughness it is toast. If you want to inspect it just push the retainer out and let the balls all go to one side then take it apart. look at the the outer race with a glass.

First member of Member of Bearings Anonymous

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05-04-2004 05:43 AM  13 years agoPost 11
tabbytabb

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seattle

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Doug, Great Info thanks for sharing. After looking at the bearing I can see that it is toast. My question now, is my conrod likely to be OK? Or would this have toasted it also. How can I tell?

Thanks

Tabb

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05-04-2004 11:28 AM  13 years agoPost 12
rickc

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Creve Coeur IL. (Peoria Area)

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Heli has webbing partially removed
I was thinking partially meant the mod was not complete and rust could still be a factor for failure. The back plate can become marked if the fan even came loose on the previous owner, the marks don't necessarily mean you have a problem. Rods do become egged over time; some play in the rod and pin is normal but not a lot. As you rock the crank watch the oil around the pin to see the play. More than likely the bearing was on its way out before the mod was performed and just a partial removal of the webbing was not sufficient. A new set of Boca high-speed bearings and finishing up the mod will probably get you back in the air.

Rick

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05-04-2004 06:37 PM  13 years agoPost 13
tabbytabb

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seattle

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Thanks Rick, New bearings are on the way, hopefully that will get the miami raptor back in the air!

Tabb

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05-05-2004 03:48 AM  13 years agoPost 14
KC

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WA

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I shoulda called it "Moon over Miami raptor"

rickc, this is tabb's crank, I do these, its bevel cut towards direction of rotation on the LH web only.....take a look, I have other os 50 examples in my gallery.

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05-17-2004 05:29 AM  13 years agoPost 15
ChiefG

rrApprentice

Hawaii

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Just got my OS50, want to know what benefits is expected if I do the crank mod?

thanks,

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05-17-2004 07:08 AM  13 years agoPost 16
mrNoodles

rrProfessor

Borlänge, Sweden

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Removing the webbing should make the bearing live longer.
Since the webbing makes the oil stay inside the bearing and makes it corrode.

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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05-17-2004 07:17 AM  13 years agoPost 17
ChiefG

rrApprentice

Hawaii

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thanks for the info, looks easy enough for me to do.

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HelicopterEngines Plugs Mufflers Fuel › OS 50 Bearing Questions
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