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ProModeler Scorpion Power
HelicopterEngines Plugs Mufflers Fuel › OS 50 SX-H piston ring
12-17-2003 11:32 AM  13 years agoPost 1
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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No trick really, just excersize care. Put piston/conrod assy on to the crank pin. With piston at the top of the cylinder, note where the stop pin in the piston is, that prevents the ring from turning. Align the ring with the pin. Now start the bottom of the sleeve into the cylinder, taking care that the ring does not turn. The inside bottom of the cylinder is chamfered to act as a ring compressor.

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12-18-2003 04:28 AM  13 years agoPost 2
cmdiduca

Veteran

Mt. Pocono, Pa

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Cant stress enough to watch for that ring stop. Mine was pushed in a little and allowed the ring to turn and the first time i cranked the engine the ring broke. Worst part was I drove for 7 hours to a fun fly and broke it there without a replacement.
Make sure the ring doesnt turn.
Chris

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12-19-2003 06:43 AM  13 years agoPost 3
sidney

Heliman

Taiwan

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It's very difficult to put the ring back if the ring is not perfectly perpendicular to the cylinder.
So, put the cylinder back to crank case about 10mm deep, attach the push rod and piston in place. Just turn the crank lightly. Done.
Never keep turning the crank when you feel the ring is block.
That's how I put the ring back.

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HelicopterEngines Plugs Mufflers Fuel › OS 50 SX-H piston ring
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