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HelicopterEngines Plugs Mufflers Fuel › Cleaning Piston
03-13-2016 12:42 PM  21 months agoPost 1
datidun

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N Ireland

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Hi Guys,cleaning up a Piston a little from a OS 50 hyper,what do you guys recommended to get the oil stains off,I came across a post that acetone can be used from nail polish remover,or white spirit,are those safe to use on the piston.

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03-13-2016 01:54 PM  21 months agoPost 2
fastflyer20

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N. Tonawanda, NY

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Soak it in warm straight antifreeze in a pan, nothing works better. Use a tooth brush to scrub the cylinder fins, etc. The longer the soak, the better it works, 2-3 hours is usually a good start. A second soak may be required. This has been used for years on nitro engines.

Some use a dedicated crock pot as you don't want to cook anything in it after cleaning the engine.

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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03-13-2016 04:10 PM  21 months agoPost 3
Jerry K

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Houston Area

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Why do you want to clean the piston? Is there an EXCESSIVE amount of carbon build up in the top or around the ring area. If so you may be running the mixture off or you have to much caster oil in your fuel. The newer fuels run much cleaner and only contain a small percentage of caster if any at all.

You asked about "oil stains" (on the piston) why do you want to remove those? They do not effect how the motor runs!

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03-13-2016 08:01 PM  21 months agoPost 4
Gearhead

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Vt

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Soak it in warm straight antifreeze in a pan
what's cool about antifreeze (other than it works great) is that you can buy a small crock pot, fill it with antifreeze, take a good running engine that has 2, 3 or 4 or more gallons run threw it and cook the entire engine over night on medium, pull out the engine the next day and clean it off with WD (don't forget to spray out the inside of the engine very well),,,

I did this with a few engines, my OS 61FX plane engine had 6 gallons run threw it and it came out super clean, even the top of the piston was clean, and no need to take the engine apart

you can also add extra detergent of sorts to the antifreeze if wanted,

and, you can keep the antifreeze in a jug to reuse.

Jim
Buzz Buzz Buzz

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03-13-2016 08:04 PM  21 months agoPost 5
datidun

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N Ireland

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Thanx Tom,no Castor in the fuel I use,I just like the engine looking like new,while I am changing the bearing might as well clean a few other parts.

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03-14-2016 02:05 AM  21 months agoPost 6
Todd74

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PA, USA

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Spray carb cleaner from the auto parts store and an old toothbrush works really well for cleaning the carbon off. Just use in a well ventilated area or the fumes will kill your brain cells.

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03-15-2016 09:56 AM  21 months agoPost 7
EEngineer

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TX

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small crock pot
So that's why your cooking tastes.....strange...lol

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03-16-2016 01:32 AM  21 months agoPost 8
Gearhead

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Vt

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So that's why your cooking tastes.....strange
yeeaa, I forgot to clean it out that day before I gave it back to the wife

Jim
Buzz Buzz Buzz

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03-16-2016 11:41 AM  21 months agoPost 9
EEngineer

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TX

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LOL

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03-16-2016 11:43 AM  21 months agoPost 10
EEngineer

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TX

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It's cool...would have used a crockpot, too...

Whatever it takes....lol

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03-16-2016 01:56 PM  21 months agoPost 11
grim.the.grim

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Houston, Texas

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Doing this won't affect the carb or the bearings? Or must one remove the carb and replace the bearings?

*** Real Pilots BEAT the air into submission! ***

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03-17-2016 03:44 AM  21 months agoPost 12
Gearhead

rrMaster

Vt

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Doing this won't affect the carb or the bearings? Or must one remove the carb
well I didn't remove the carb on my 61 Plane Engine, and that engine sat in the pot for 10 hours, if you wish you can remove the Carb's O-ring before the soaking,,

BTW, you really don't need to soak it for 10 hours, 6 hours may be enough, but that is for you to decide if you think it's clean enough,, but remember it will take more than 1 hour to get the antifreeze hot
and replace the bearings?
no, not if the Bearings are in good condition and they are un-shielded (at least on 1 side) so you can clean them out good with spray oil

if you wish, after you use the spray oil, you may want to rinse out the engine with fuel to remove as much spray oil as you can

Edit, BTW, I have also used Rubbing Alcohol to remove the antifreeze and spray oil, the Alcohol leaves the engine dry and clean

Jim
Buzz Buzz Buzz

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03-21-2016 12:24 PM  21 months agoPost 13
EEngineer

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TX

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I have also used Rubbing Alcohol
That crockpot has some flavor....lol

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HelicopterEngines Plugs Mufflers Fuel › Cleaning Piston
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