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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › Rebuild OS 50 engine
10-31-2016 05:17 AM  3 years ago
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trexflyer2003

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northridge ca,91324

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Rebuild OS 50 engine
I am changing bearings and the piston ring for the OS 50 engine.
Can I use after burn oil to lubricate the engine?
Thanks
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10-31-2016 12:02 PM  3 years ago
KJH

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Marvel Mystery Oil works for me as an after run oil and when reassembling rebuilt engines.-Kevin
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10-31-2016 01:22 PM  3 years ago
trexflyer2003

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northridge ca,91324

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After run oil
Thanks Kevin.
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10-31-2016 01:42 PM  3 years ago
KJH

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3-in-One oil and automatic transmission fluid work, too. Just about any oil will work when rebuilding an engine.-Kevin
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10-31-2016 07:01 PM  3 years ago
Gearhead

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it's soon to be winter, so if this engine is going to set until spring or longer you will want to use a non-gumming oil, people say that ATF wont gum up,, if you will fly it soon, then most any good oil will work, but if you are a stickler and are going to run the engine soon you will want a 2-St oil that will blind with alcohol,
some people use Glow Fuel if they are going to fly the engine soon after a rebuild
Jim
Buzz Buzz Buzz
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11-01-2016 01:24 AM  3 years ago
Dr.Ben

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Another tip for those in cold climates: if you are going to rebuild and then wait to run the motor until next season, fine. If you rebuild, fly just a few times, and then store for the season, you still risk loosing the rear bearing over the winter lay up unless you turn the engine every so often. Even with after run oil, a bearing that sits a long time is apt to corrode at the contact points of the balls. It's frustrating as hell to have to change an effectively nee bearing all over again next spring when it starts making a racket on the second flight of the season.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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11-02-2016 12:54 AM  3 years ago
trexflyer2003

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northridge ca,91324

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Os 50
Thank you!
My Trex600NSP sits for 5 years on the shelf with after run oil every 2 years. bearings and piston ring are bad.
So, how long does your engine sit without damage? Assuming I will fly a few time and fill it With after run oil.
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11-02-2016 03:56 AM  3 years ago
Gearhead

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So, how long does your engine sit without damage? Assuming I will fly a few time and fill it With after run oil
I would think that depends on the quality of the bearings and the humidity where the engine is stored, I guess you could add more oil than usual to soaked the engine and turn it over weekly
Jim
Buzz Buzz Buzz
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11-02-2016 04:46 AM  3 years ago
Dr.Ben

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Yep.

You gotta basically submerge the rear bearing in oil or else the position of the model will let the oil flow off some portion of the bearing. From there you have to turn it over routinely. Even then and unless you have a room where the air is kept dry as heck, you're still apt to loose the rear bearing from it just sitting. Plain rust is fairly easy to stop, but the balls still pit where they contact adjacent metal parts of the bearing. The bearing might not go out the first flight of the season, but it doesn't take long to start hearing the tell-tale growl/howl of a bad rear bearing when the engine is running at idle.

Without opening another can of worms, widely intermittent engine use is one place where I could make a real case for a Center-Glide bearing.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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11-02-2016 04:58 AM  3 years ago
Ace Dude

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USA

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Vacuum sealing an engine when not in use for long periods might be a viable option. Adding some silica gel might not be a bad idea either depending on how much vacuum your sealer can pull.

Of course, the Center-Glide option is a lot less work.
  
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11-03-2016 01:35 AM  3 years ago
trexflyer2003

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northridge ca,91324

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Thank you.
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