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12-07-2004 02:46 AM  13 years agoPost 1
Aaron29

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USA

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12-07-2004 07:25 AM  13 years agoPost 2
ShempHoward

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San Francisco, Ca - too many beggars + bad drivers

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Flush the bearings out with either Automotive carb cleaner or WD-40 by using the thin red tube that attaches to the spray top. Keep giving them short blasts until the fluid coming out is clear and then feel the bearings by hand to see if they are smooth. If so get some Marvel Air Tool Oil (a much better afterun than plain Marvel Mystery) and lube them up really good.
Air Tool Oil makes an excellent long term storage oil as well since it will not gum up over time like Marvel Mystery Oil will.

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12-07-2004 01:29 PM  13 years agoPost 3
airdodger

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Johnston USA

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Why mess around a new bearing is less than ten dollars,if it is rough no cleaner is going to fix that. Chris

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12-07-2004 07:39 PM  13 years agoPost 4
ShempHoward

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San Francisco, Ca - too many beggars + bad drivers

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I think its worth trying to flush out the bearings first as I have saved a few engines for friends this way. Sometimes after an engine has been sitting unused for a period of time it will start to gunk/cake up with congealed oil giving the bearings a rough feel. Upon flushing them out well followed by a good lube often times they then feel smooth and normal. The few that I did this to are still running fine many flights later. Its worth the time and $. The engne in question here as only 2 gallons thru it so excess bearing wear shouldn't be a problem.

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12-07-2004 08:36 PM  13 years agoPost 5
Doug

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Port Saint Luice Florida....

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Just for info the bearing should be flushed with solven alone and let dry. Then turn with your fingers with a little preload they soould be "dead smooth. Any oil will mask slight damage.

First member of Member of Bearings Anonymous

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12-08-2004 02:15 AM  13 years agoPost 6
DS 8717

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Here wishing i was somewhere else

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Hi all,

.I'm upgrading my Raptor to a 50, and thought I'd overhaul the little 32 that's in it. Little engine has been great for 2 cases of fuel, but I need >displacement.

>So I take it apart and the rear bearing looks brown. It feels rough too. I figure it's been eaten. But then I remember CY's Q&A book mentioning that after run oil leaves deposits.

>I've been using after run oil religiously since the start. Maybe he's right and I should only use it for long term?

>And if he IS right how do I get this bearing back to good shape? Is there a good cleaning method?

>Aaron

What brand of fuel were you using? The brown sounds like rust,do run the motor dry or just pinch the fuel line to stop it then add after run oil?
I use castor for after run oil with out any problem except for some brown stains on the muffler that comes off easily with mothers mag wheel polish. I have some 35 years old ETA 29 control line speed engines that were put up after using only castor for lube,since thats all that was availabe at the time ,and the bearings and rings were still in perfect condition. I soaked them in automatic transmittion fluid for a day then cranked them and ran them.
When we raced the RC boats, using 60 and 90 size ABC motors we ran a 10Êstor and 10% synthetic oil mix,any less castor (ie: 5% castor and 15% synthetic )and we would have bearing problems.
The problem i had using a petrolem after run oil,was it would not mix with the fuel when it was pumped into the tank from the muffler pressure line. It would form little snot balls and clog the fuel filter,took me a little while to figure that one out, I have since gone to castor and not had a problem,even if i let the motor sit for a few months.
DOUGLAS

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12-11-2004 07:02 PM  13 years agoPost 7
Aaron29

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12-11-2004 10:20 PM  13 years agoPost 8
DS 8717

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>Are you running castor all the time or just last tank?

>Aaron

I dont run it,i just use it for afterrun oil.

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12-12-2004 04:41 AM  13 years agoPost 9
Aaron29

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12-12-2004 08:56 AM  13 years agoPost 10
Al Magaloff

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12,199 Posts- Enough Time Wasted. See Ya!

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Straight castor? No, fuel with castor. Last run of the day, you empty the main tank of fuel, hook up a bottle of castor based to the carb, Start motor, allow to run some, then run it out of fuel. Castor is left behind. One of the RC car squeeze bottles works well. I use Cool Power Omega.

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12-23-2004 06:13 AM  13 years agoPost 11
Aaron29

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12-23-2004 08:13 AM  13 years agoPost 12
Al Magaloff

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12,199 Posts- Enough Time Wasted. See Ya!

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I would think a header tank full is plenty. I only do at the end of the season for storage, so I don't have to deal with it every flying day. Instead of carrying a gallon of Omega around, just buy one of the rc car squeeze bottles. Run right of the bottle. Packs better in the flight box.

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