dkshema
rrMaster
Location: Cedar Rapids, IA
My Posts This: Topic Forum | That "washer" goes on the front of the crankshaft, inside the motor, and is a spacer between the front of the crankshaft and the rear of the inner race of the front bearing.
The chamfered side goes toward the crankshaft...
   
The thrust washer/prop drive fits on the front of the crankshaft, and is held in place by a split cone.
If you don't put that spacer inside the motor, it's going to bind up something fierce when you try to tighten down the nut on the end of the crank.
Yes, that X-25 of mine spent many hours on the front of a 25-sized Dirty Birdy, a plane that I finished building in June 1984, and that with a little TLC, will fly again. The X-25 would be once again up-front, but the top end of the conrod is a bit stretched. If I could locate a good rod, I'd put it back in service.
BTW -- the piston has a pin in it to locate the ring gap. If the front of the crank shaft is 12 o'clock and the rear of the crankcase is 6 o'clock, the piston is installed correctly if that pin is at about the 7 o'clock position.
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* Making the World a Better Place -- One Helicopter at a time! *
Dave |
