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HomeAircraftHelicopterHelicopter Main Discussion › Dark oil from engine
10-13-2005 03:33 AM  13 years agoPost 1
Helibras

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São Paulo, Brazil

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Hi guys,

I'm breaking in my 37SZ-H and after the 4th tank I notice a drop of dark oil on the table below the exhaust. I checked and the muffle is indeed spitting oil with dark gray color.

Is it normal during breaking in process??


Gravity... the force to be defeated
Raptor 50SE; Hyper
Vigor CS; OS 91C-Spec MPII

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10-13-2005 03:46 AM  13 years agoPost 2
Wa11banger

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Huntsville, Al

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It is probably a little loose or ill fitting... Dark oil is not normal during break in.. Dark oil is usually present where things are loose and vibrating against each other. CF Frame pieces, muffler to engine, etc

Look for something loose, it can even be tight but ill fitting, just because bolts are tight does not mean it fits well

It's a place to start

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-13-2005 03:49 AM  13 years agoPost 3
dpope49

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Luverne, Alabama

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May or may not be anything to be alarmed about as long as you have not run your engine way too lean. More than likely it's just carbon from burned oil.
One quick way to check is to put some on a white paper card. (I use the back of a business card)
If there is any metal in the oil it will be visible under a magnifying glass after the oil soaks into the paper.
Shiney silver specs = metal.
Dull dark specs = carbon.
I have engines of all ages that drip dark oil depending on running conditions and the type of oil I use.
The higher the castor content and the higher the engine temp, the more likely you will notice this.
My 4stroke plank engines produce very high exhaust temperatures and produce dark oil residue.
Same holds true on my 2 strokes but to a lesser extent.
As wa11banger says, if it is metal, it could be something as simple as a loose fitting or muffler.

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10-13-2005 10:50 AM  13 years agoPost 4
DS 8717

rrProfessor

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Ringed engines will have some black residue in the exhaust while they break in,that is normal. It should stop after the ring seats in.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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10-13-2005 12:45 PM  13 years agoPost 5
dkshema

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Cedar Rapids, IA

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Dark gray from the muffler is not good. Check the most obvious source, a loose muffler.

The oil coming from the muffler will be a bit dark, but if everything is OK, the oil will be clear, but it won't be gray.

As suggested, look for small bits of metal particles in the residue. Even if you are breaking the motor in, there should not be a large amount of metal particles.


Dave

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10-13-2005 04:30 PM  13 years agoPost 6
Helibras

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São Paulo, Brazil

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My engine has 6 flights now and is still not broke-in. I never leaned it too much because I always start the flight hovering with a rich mixture and go leaning it and changing to FF. It starts really cold and in the end, after some FFF its hot as it should be if correctly setup (can keep my finger there for 3 sec.)

Hey dkshema, I’m not sure if the oil is Dark Gray or Light Black.

But I will check it up this and also if some particles can be noticed but haven’t notice dark oil in the last 2 flights. Hope never again.

Thank you all guys for great feedback.

Ricardo


Gravity... the force to be defeated
Raptor 50SE; Hyper
Vigor CS; OS 91C-Spec MPII

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10-13-2005 06:59 PM  13 years agoPost 7
DS 8717

rrProfessor

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That dark residue in the oil is from the ring seating in. It is normal and will stop as soon as the ring seats,which it sounds like it already has.
Is more noticable on planes where you get more oil on the plane as it's easier to see. This only applies to ringed engines.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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10-14-2005 02:07 AM  13 years agoPost 8
Luis104

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Caracas / Venezuela

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how can I know when the engine has been brake in???

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10-14-2005 02:17 AM  13 years agoPost 9
Helibras

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São Paulo, Brazil

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Good question. I'm not sure mine did already. At least I was expecting some noticeable performance increase.

How many flights is an average ringed engine breaking in time?

Ricardo


Gravity... the force to be defeated
Raptor 50SE; Hyper
Vigor CS; OS 91C-Spec MPII

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10-14-2005 09:58 PM  13 years agoPost 10
heligoole

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yorkshire,uk

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not too many on a ringed engine,about half a gallon ,run rich,not reving engine too high,then usually ok

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10-14-2005 10:43 PM  13 years agoPost 11
DS 8717

rrProfessor

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The richer you run it,the longer it takes. Agallon should be enough on a 37.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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