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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › I cant put a ring-piston
05-23-2007 02:16 PM  13 years ago
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maticeci

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argentina

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I cant put a ring-piston
I took my new OS 50 to clean it up and its being pretty hard to put the piston with the ring into the sleeve. So I really don’t want to keep trying until I know which way it actually goes.

Can the open part of the ring face any direction or does it have to be facing a specific direction?

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05-23-2007 02:23 PM  13 years ago
Yug

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UK. Herts

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There's a small pin in the groove where the ring sits, this MUST align with the ring opening.
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05-23-2007 02:34 PM  13 years ago
capebob

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Cape Coral, FL

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If you look closely at the ring groove in the piston you will see that there is an indexing pin that is designed to secure the ring in a fixed position. Your ring must be installed so that the open ends of the ring are over the indexing pin. Mark the top of the piston where the indexing pin is and install the piston/connecting rod assembly in the engine. With the piston at top dead center slide the sleeve into the cylinder and carefully wiggle it, keeping the piston as square to the sleeve as possible with your spare hand. The sleeve is chamfered on the bottom and the chamfer will compress the ring and the sleeve will slide on. Once the sleeve is started make sure that the indexing slot on top of the sleeve is lined up with the pin in the top of the engine before you push the sleeve all the way down.

Bob
Success is the ability to go from one failure to another with no loss of enthusiasm. Churchill
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05-23-2007 03:09 PM  13 years ago
maticeci

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argentina

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PICTURES of my engine

SLOT

GOOD ?

BAD ?

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05-23-2007 03:23 PM  13 years ago
BarracudaHockey

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Jacksonville FL

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A little ATF or air tool oil around the top of the piston and bottom of the cylender makes things go together smoothly.Andy
AMA 77227
http://www.jaxrc.com
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05-23-2007 03:48 PM  13 years ago
Yug

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UK. Herts

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Looking at the last picture, it looks like the liner isn't lined up with the notch in the case, the ring is expanding into the liner port which can allow it to get stuck. Yes, use oil to help it slide
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05-23-2007 03:56 PM  13 years ago
Isaac F

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Panama Republic of Panama

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Looking at the last picture, it looks like the liner isn't lined up with the notch in the case, the ring is expanding into the liner port which can allow it to get stuck
I agree with Yug. The liner isnt lined or you put the piston on the wrong direction. I will bet for the piston installed on the wrong direcction. Turn the piston 180 deg.

When the piston is installed correctly you will never see the ring union thru a port.

Isaac

.
Speed of light is greater than speed of sound. Some people seem very bright until U hear them speak
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05-23-2007 09:43 PM  13 years ago
RayJayJohnsonJr

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Midwest

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Is there an 'up' and a 'down' to the ring?

-Mark
There, their and they're. It's really that simple.
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05-23-2007 10:33 PM  13 years ago
Yug

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UK. Herts

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No
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05-25-2007 04:03 AM  13 years ago
cassat

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Alberta,Canada

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The skirt in bottom of piston goes to front or back of engine?
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05-25-2007 04:38 AM  13 years ago
dkshema

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Cedar Rapids, IA

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As I recall, if the threaded end of the crankshaft is the twelve o'clock position, the exhaust port the three o'clock position, backplate at six o'clock, when the piston is properly installed, the little pin for the piston ring, and the ring gap show up at about the two o'clock position.

The ring gap rides up and down in the sleeve between the front bypass port (at the 12 o'clock position, and the exhaust port). The ring gap rides on cylinder wall all the way up and down.

Also, the cylinder has a small notch in the top lip, and the top of the crank case has a small pin at the six o'clock position. The notch in the clyinder lip is positioned around that little pin.

That picture labeled "bad" is truly bad. It looks as if the ring on the right hand side of the gap is sprung OUT and will easily hang on the edge of the port and will break.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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05-26-2007 11:45 PM  13 years ago
GMPheli

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W. Bridgewater, MA USA

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I don't know about your engine, but most motors have an arrow on the top of the piston that points toward the exhaust port
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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › I cant put a ring-piston
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