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HelicopterEngines Plugs Mufflers Fuel › OS 50 rebuild
04-04-2005 02:54 AM  13 years agoPost 1
ozurovich

rrNovice

Orange County, CA

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I'm going crazy trying to rebuild my OS 50.

I'm having lots of difficulty re-installing the piston ring, sleeve, and connecting the rod to the crank.

Is there an easy way to do this?

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04-04-2005 03:33 AM  13 years agoPost 2
airdodger

rrElite Veteran

Johnston USA

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You need to put the rod and piston assembly on the crank, then slip the liner over the piston and ring, make sure the ring is positioned correctly. Mark the top of the piston where the pin is, and rotate the liner until you can see if the ring stayed in position through one of the ports on the way down. Check the ring in the liner first to make sure it has a gap, square it up with the piston inserted from the top to check. The chamfer on the rod goes to crank. Chris

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04-04-2005 09:00 PM  13 years agoPost 3
ozurovich

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Orange County, CA

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Thanks - will give it a try

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04-04-2005 09:05 PM  13 years agoPost 4
vcptech

rrApprentice

Dominican Republic

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if you don't have experience working with engines , I would sujest you
to look for help around, then you will see the results........

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04-05-2005 01:00 AM  13 years agoPost 5
2LTime

rrKey Veteran

Walworth,NY

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I have also found it usefule when pushing the sleeve down over the piston/ring to lube both up with some light machine oil. I put it on the bottom of the sleeve and the top of the piston wall.

Jeff

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04-05-2005 03:25 AM  13 years agoPost 6
pariah

rrVeteran

South Jordan, UT - United States of America

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I'd suggest visiting this site: He actually has pictures on what to do.

It may not be about whatever you need to rebuild your engine for, but since changing the bearings is a non-trivial thing, and it does cover the piston/cylinder issues.

RaptorTechnique


--
The last thing I want in a heli is a few loose screws.

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04-05-2005 10:23 AM  13 years agoPost 7
Rogue123

rrKey Veteran

Phoenix AZ

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Uhm Lets look at what is going on.I hate to say this OK. this works well with YS mainly have not had a prob with OS.


Step one ( when replacing a rear bearing) take every thing a part.

Heat engine case( 350F for 10 min )
Tap out rear bearing

put into the freezer the piston and sleeve ( Hint Hint ) and lube.

Put everything back to gethere, and rotate the seelve back over the the head.

Done

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HelicopterEngines Plugs Mufflers Fuel › OS 50 rebuild
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