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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › TT pro-50h Rebuild Questions
11-18-2011 04:50 PM  6 years agoPost 1
Norm

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Nova Scotia, Canada

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I am just in the middle of a rebuild this afternoon. I was about to install the connecting rod. When I noticed The bottom of the rod is not symmetrical. One side has an impression running down the rod. Where the other does not. Which side faces the rear of the engine?

Thanks

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11-18-2011 05:27 PM  6 years agoPost 2
Norm

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Nova Scotia, Canada

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I figured out the con rod. But I seem to be having problems with the piston liner. It will not slide easily into the case. Looks like a trip to the freezer for it.

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11-20-2011 11:47 PM  6 years agoPost 3
drdot

rrElite Veteran

So. California, Orange County.

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fwiw..

I usually heat the case in a 350 degree oven for about 15 min...Parts slide right together if you work quickly...

Good luck!
John.

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11-21-2011 01:30 AM  6 years agoPost 4
gftazz

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upstate N.Y. in the Adirondacks

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Sometimes you have to start it at 90degrees to the pin in the case.
There may like on most motors be a small alignment pin in the crankcase.
I look to see where the end gap is on the ring and there is a small pin on the piston where the ring ends line up

Now on the bottom of the sleeve it may have two longer skirt sides turn it 90 degrees so as that skirt covers the end gap in the ring on the way down over the piston going into the liner so that to not catch the ends and break the ring.

At this point the notch in the sleeve will be off but slowly rotating into the correct alignment of the notch with the case pin as the sleeve goes down into the case. If you try to go straight on in with it, it usually hangs up on the case part way in being just slightly cockeyed going in the case so rotate it starting 90 degreeas off and it should slide right in.

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

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11-21-2011 02:29 AM  6 years agoPost 5
Norm

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Nova Scotia, Canada

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I took the liner out of the freezer after a bit. With some gentle wiggling it dropped freely into the case. Now my engine has brand new bearings and ring. If the weather gets nice it'll be time for a test flight. Hopefully not resulting in an inverted surprise auto. Like the last flight. But at least I know how to do them now.

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