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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Another OS 50 Hyper Bearing Question...
10-11-2005 09:33 PM  12 years agoPost 1
V8Buggy (RIP)

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USA

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A few details, OS 50 Hyper 1 -1/2 gallons of Cool Power 30% since new. Second flight today after setting it down at the end it sounded like a spoon in the garbage disposal. Rear bearing right? After both flights today backplate barely warm to the touch, and CHT was 175, checked right on the glow plug.
This engine has been very hot ( My Bad ), last week end it was bogging a little during repeated flips, rolls etc. thinking it was too rich, we turned it in 2 clicks. It had more power after that, ( now I suspect it was because it had a chance to cool a bit while being adjusted ). Anyway 2 clicks in made it better, so try one more. This time it was lean enough you could hear it sag, landed quickly and richened it back up. After this flight glow plug was melted, no suprise. Also, head gasket was leaking. I checked the head gasket, and it looked Ok, so I put everything back together and ran it for about 4 more tanks.
Three Questions:
1) Could I have killed the bearing even though it had about 6 tanks through it before noise started?
2) After tearing it down, the front bearing has a slight amount of roughness, but the rear bearing looks and feels fine. I popped off the bearing cage and looked at each ball and both races, they look good to me. ???
3) I ordered the BOCA ceramic HP bearing for it, anybody have any experiance with these?

Sorry for being so long, and I know this has been hashed over and over.
Thanks

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10-11-2005 09:58 PM  12 years agoPost 2
BarracudaHockey

rrMaster

Jacksonville FL

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http://www.rc-bearings.com has ceramics for less than half of what Boca was charging. Paul also floats around here and answers related questions under DesertSky

Andy
AMA 77227
http://www.jaxrc.com

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10-12-2005 11:42 AM  12 years agoPost 3
DS 8717

rrProfessor

Here wishing i was somewhere else

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I think he's using the wrong name for the bearings. The one in the end of the crankcase (the smaller one) is the front bearing,the one in the inside (the larger one ) is the rear.

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

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10-12-2005 01:03 PM  12 years agoPost 4
V8Buggy (RIP)

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USA

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Nope, I know front from back...
After a lot of messing around, both bearings have a little bit of roughness, very little. When I hold the front bearing in my hand and spin the crank, it's a little rough, but quite. When I put the rear bearing in my hand and spin the crank, it feels about the same, but does make considerably more noise. I'm thinking that once it gets up to operating temp, it gets worse. Also I think I caught it, before it went completely out. I run the JK pipe which is very quite, and I was the only person at the field, so it was very quite. Whichever bearing, or both is bad, it allowed the crank to make light contact with the rotary valve ( crank valve ) part of the case. I have re-polished both of these surfaces, and I'm sure they'll be fine. This is a very close fit, and if either bearing allows the crank to go even slightly off center, there will be contact. Anyway, it’s getting two new ceramic bearings, new ring, and new gaskets.
Thanks

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10-12-2005 02:52 PM  12 years agoPost 5
V8Buggy (RIP)

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USA

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Your probably correct...
It was just a couple of little lines around the crank and case. Probably just a little piece of something went through. I am begining to think there wasn't anything wrong, just all in my head and ears. Had I not read so much about it, I would have probably just fueled her up and flown her. Oh well. Found out to late about your much better deal on the bearings, for the price difference, I'm sure these will come in a velvet lined hardwood case. LOL
Thanks

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10-14-2005 09:16 PM  12 years agoPost 6
V8Buggy (RIP)

rrVeteran

USA

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Well, It must of been the bearings..
after looking them over I wasn't so sure, but it's back to it's quiet self. I wanted to be sure not to go lean again, especialy since I also re-ringed it while I was putting the bearings in, so I started it at 1-3/4 turns. Ended up only coming down about 2 clicks. Not sure if it's the Bellwood head or the JK pipe, but this OS likes lots of fuel. It makes great power at a little over 1-1/2 turns, and the back plate just slightly uncomfortable to hold.

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10-21-2005 06:29 AM  12 years agoPost 7
Gearhead

rrMaster

Vt

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w rong post

Jim

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