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HelicopterEngines Plugs Mufflers Fuel › Black Oil Out of OS50-SX
07-12-2008 04:40 PM  9 years agoPost 1
rudyy

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E. Amherst, NY

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I find some black oil underneath the heli after every flight. My engine is OS50 non hyper. I think something is not right. Any idea?

Rudy

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07-12-2008 04:47 PM  9 years agoPost 2
WreckRman2

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Orlando, FL

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This is normal. It is left over from the fuel and it simply turns a darker color from the heat of the engine and muffler.

Heli fuels have a higher content of oil to help with the cooling of the engine and it simply can't burn it all.

________________
David Smith
407.937.9556

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07-12-2008 05:32 PM  9 years agoPost 3
helirulz

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Singapore

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check to make sure your conrod isn't rubbing against the backplate.

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07-12-2008 05:50 PM  9 years agoPost 4
nivlek

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Norfolk England

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If the oil is black ,it can be a sign of having aluminium in it , so Helirulz might be right .

At the end of the day , it gets dark .

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07-12-2008 08:50 PM  9 years agoPost 5
payne1967

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uk

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check that the exhaust bolts are tight

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07-12-2008 09:31 PM  9 years agoPost 6
David Blain

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Mt. Dora, Florida​(USA)

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I second the checking exhaust bolts!
(but also make sure exhaust/engine seal is good!)
As mentioned above you engine in flight emits a small fog of fuel vapor and this can build up in the cooling fins!
Once helo is sitting for a short time it isn't unusual to see some drips underneath it! this is the vapor collecting from the fins...
If it's a steady drip look closer.
Let us know how you make on this!

Pull-n-Pitch

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07-12-2008 09:41 PM  9 years agoPost 7
CT.Chopper

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Meriden, CT

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something could be loose,
muffler, backplate, head, glowplug...
or a broken baffle in the muffler ( but that would be leaking from the outlet)

Rob Landry.

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07-12-2008 09:55 PM  9 years agoPost 8
payne1967

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uk

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the other one to check is the fan casing rubbing on the cylinder head

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07-12-2008 10:39 PM  9 years agoPost 9
SkateFreak

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Cambs UK

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Hey,
black oil is not uncommon, but sometimes it can be a sign of metal shavings so keep an eye on the engine, if it starts to lose some power or the running characteristics start to change give her a strip down and look for any exessive ware anywhere...
If it were the bearings you would proberbly notice a notchy feel when turning the engine or the engine sound

jst a though

-Jvr

Non-3D heli pilots are planker spys trying to bring down the heli community from the inside - Topher

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07-13-2008 02:19 PM  9 years agoPost 10
JuanRodriguez

rrProfessor

The Villages,​Florida

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Rudy,

You didn't by chance follow this rediculous recommendation (link below), did you ??? LOL!!!

http://www.runryder.com/helicopter/...?top=1215955006

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07-14-2008 06:06 PM  9 years agoPost 11
Andy from Sandy

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Bedfordshire, UK

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I would concur that two or more parts are rubbing together and one of them is made of aluminium.

The oil (unless it contains graphite) should not be black. It doesn't stay in the engine long enough unlike the oil in the sump of your car.

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