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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › black liquid on os 50 hyper
02-05-2008 01:28 AM  10 years agoPost 1
michael88997

rrElite Veteran

Lewisville,Tx

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ok so i was messing with my heli today and noticed there is a little bit of black liquid on the bottom of the engine... a friend told me it means something is loose. but what would be loose in the engine?

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02-05-2008 01:35 AM  10 years agoPost 2
george0079

rrElite Veteran

USA

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Do you have the spacer washer on the crank? I could be the crank rubbing against the back plate....

the back plate screws...

Head bolt...

Muffler bolts.....

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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02-05-2008 01:36 AM  10 years agoPost 3
michael88997

rrElite Veteran

Lewisville,Tx

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it looks like its comming from the muffler bolts... maybe i just didn't put enough locktight on the nut holding it on

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02-05-2008 02:30 AM  10 years agoPost 4
jsenicka

rrProfessor

Eagle River, WI

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black goo is always exhaust + something rubbing.
Loose muffler, motor mount, anything. You are likely right on the muffler

Jim Senicka
Team Manager, GrandRC Flight Team

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02-05-2008 02:37 AM  10 years agoPost 5
dkshema

rrMaster

Cedar Rapids, IA

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BTW -- loctite on the muffler bolts is as useless as pushbuttons on a rock. It can't handle the high temperatures and becomes anything but thread locker.

Remove the bolts and muffler. CLEAN all parts (including the holes in the crankcase where the bolts go through) with alcohol to remove all traces of oil and dirt. CLEAN the parts well.

Assemble the muffler to the motor. Tighten well. Go fly. Land, and while the motor and muffler are still warm, tighten well again. Repeat the fly, and tighten while warm thing maybe one more time, the muffler should stay tight till you take it off.

-----

Yes, black goo means something is loose, and it may not be just the motor or muffler. Check all the bolts and screws on the frame, make sure they're ALL tight.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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02-05-2008 05:52 PM  10 years agoPost 6
Swoop

rrElite Veteran

Newark, DE USA

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I would like to add that, lock washers do work on muffler bolts and should be used if available. I do agree with the re-tighten while hot method.

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02-05-2008 08:13 PM  10 years agoPost 7
flyblueskies

rrNovice

Aurora, Ohio

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Do you have the spacer washer on the crank? I could be the crank rubbing against the back plate....
I'm in the process of rebuilding my OS Hyper. I don't recall this washer.

Where does it go? I think mine may be missing.

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02-06-2008 01:16 AM  10 years agoPost 8
A. Gordon

rrApprentice

Farnham,Va.-USA

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The washer goes between the fan hub and the front bearing, but is mostly not used on raptors, it makes the clutch drag on the bottom of the bell. On mine anyway. The black goo on the motor is most likely from the muffler as everyone suggested, the best way to fix this that I have found is to, take the muffler off and use a flat file to make sure the surface is flat on both engine and muffler. Only a couple of passes will do it, then use 400 grit sandpaper wrapped around the file to finish dress both. Clean both surfaces with alcohol, apply a very thin coat of high temp. rtv silicone and reinstall using nylon bushing lock nuts. No more gaskets and don't have to keep retightening, also have not had a leak since doing this.

All for the spectators!!

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02-06-2008 01:29 AM  10 years agoPost 9
Zaneman007

rrElite Veteran

Texas - USA

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The muffler is the most likely cause. When I first got my CY pipe, I had a hard time keeping the muffler securely attached to the motor. I got Black piss on everything. It would spew on the inside of the canopy and make a mess of that whole side of the heli.

I finally used lock nuts(what ever they are called). The ones with the plastic on the threads. I agree with dks, lock tight, even red, is useless on the muffler.

Old Guys Rule!

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02-06-2008 03:34 AM  10 years agoPost 10
michael88997

rrElite Veteran

Lewisville,Tx

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zane are you saying you used the nylon nuts? i would think nylon couldn't hold up 2 the temps

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02-06-2008 12:18 PM  10 years agoPost 11
flyblueskies

rrNovice

Aurora, Ohio

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The washer goes between the fan hub and the front bearing, but is mostly not used on raptors, it makes the clutch drag on the bottom of the bell.
Thanks A.Gordon!

I have the Raptor and the washer is missing. I did push the fan backwards and the crank shaft does not move. So, I don't think it will be a problem.

As far as the black goo, I noticed the Hyper head rubs on the frame of my heli. It's as if someone took a file and lightly filed the blue coating off the head.

I always thought the black goo came from this. If so, I don't see anyway to stop it. All the bolts are tight...it's just that the blue head is so big, it rubs.

Any thoughts?

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