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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Rebuild HZ55 ??
01-30-2012 12:32 AM  6 years agoPost 1
devens2448

rrApprentice

Pekin, Il

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I was wanting to freshin up my OS55. I have new bearings and was going to replace the sleeve. I am assuming I would need to replace the ring too correct? The ring looks fine but I am not sure about wear.

D

AMA #4978 Member Christian County Prop Busters, Champaign Co. RC, Pekin RC

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01-30-2012 10:12 PM  6 years agoPost 2
gftazz

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upstate N.Y. in the Adirondacks

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I would if your going to put a new sleeve in.
If the original sleeve is good just lightly hone it to put a nice crosshatch on it to reseat the new ring for breakin and get a new ring and it should be as good as new. It takes a couple of rebuilds before the sleeve really isn't any good anymore. Most rebuilds they do it this way unless the sleeve is scored or damaged in some way. Rear bearing and a new ring with a lightly honed sleeve it's like new again.

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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01-31-2012 12:05 AM  6 years agoPost 3
Agilefalcon

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Fort Worth, Texas

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I think putting the appropriate cross-hatch on the surface of the liner would be the tough thing to do. I know that on my OS motors, after a flight season the liner is completely mirror smooth. On my YS motors, the cross-hatch is still quite noticeable.

I will quote Steve Helms regarding the motor rebuild. If you are changing the ring, you need to change the liner. And I'm sure the same is true vice versa.

If you do successfully put a real cross-hatch on the liner, I'd really like to know how you did it!

Chris Berardi
Team BobbyJack's Hobbies

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01-31-2012 01:09 AM  6 years agoPost 4
gftazz

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upstate N.Y. in the Adirondacks

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Buy a small brake hone.
It don't take much just buy an automotive small brake hone it's tension adjustable and all your doing is putting a crosshatch on the sleeve by breaking the glazed sleeve so the ring can seat itself. He's saying that if you change the ring then put a sleeve in too well this is why. If asked I'm reasonably sure he would say that is fine too as pretty much everyone has done this for years on these motors. He works with or for OS so he wants parts to sell for them right.

I just move it in and out while hand twisting it and then I reverse the twist direction and do the same in and out and after a few passes it is honed good with a nice crosshatch on the sleeve with the glaze broken and the compression is fully restored with with a new ring and a bit of oil upon assembly with a new rear bearing.

These sleeves can be done a couple of times before too much wear on them then it would definately need to be replaced. The rings wear out way faster than the sleeves do on these motors.

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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01-31-2012 01:49 AM  6 years agoPost 5
CoronaL

rrKey Veteran

Winnebago IL

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I just take some 600 grit sand paper and break the glaze on the cylinder wall. Keep the same basic cross hatch pattern and put a little light oil on the wet/dry sandpaper. Put a new ring in it, new bearings and break it back in and have fun.

I've used liners 3-5 times as long as there wasn't a bad lean run and scored the liner, you should be fine.

Randy!!! I am the liquor

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01-31-2012 03:25 AM  6 years agoPost 6
Neon Juripuri

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Peculiar Mo USA

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Just take a piece of 5/16 steel line. (auto parts stores have it as short as 1 foot). Get out your dremel (or hacksaw) and cut the flare off of both ends. Then make 2 cuts length wise about an inch long so you can fold a piece of sandpaper and slide it in the line. Chuck it in a drill and you have a cylinder hone. It doesn't take much,you just want to break the glaze so it doesn't look like glass. A cross hatch pattern is nice,but the purpose of honing is to help the ring seat faster. (or wear out faster if you make the surface too rough). So just knock off the shine is the important part.

If your questioning whether to replace the ring,your cylinder is probably just fine. The ring is what wears out under normal wear and tear.
Fred

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01-31-2012 03:35 PM  6 years agoPost 7
devens2448

rrApprentice

Pekin, Il

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Thanks for the response

AMA #4978 Member Christian County Prop Busters, Champaign Co. RC, Pekin RC

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02-01-2012 04:58 PM  6 years agoPost 8
Evan03

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Idaho

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might be good investment to get bottle brush for the 50 55 and 60 size motors. these put down a good loooking crosh hatch. the brake hone is also a good idea.

i think there called berry brushes. not sure how small they come in but work awesome on larger small engine stuff.

cyclinder hones
http://compare.ebay.com/like/370580...mTypes&var=sbar

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