I just finished tearing down my engine. I am doing a rebuild for low compression on one of the faces (determined by a change in the force required to pull the prop through on that face and a quiet 'ka-chunk'), and some leaking of combustion gasses into coolant causing occasional loss of coolant if not checked before every flight.
Results of tear down..
Where are the rubber buttons? There are no rubber buttons in any of the corner seals.. not even a residue. Do they usually disappear?? I am pretty sure I recall them being there in the past, or am I mistaken? I used the strip that comes in Tracy's gasket kit.
I found a side seal that was stuck at one end. quick clean should fix it.
Coolant issue: Not sure I am happy with the TES 0-rings. Yes, they seem to have been very resistent to the heat. In general they are in excellent condition. Except, they have very little elasticity and have moulded to the shape of the chanel. In the hot area, they no longer extend above the top of the chanel and are more or less flush with the top. It seems that in this area they would be exerting minimal sealing pressure there. I am thinking about going back to the stock. Anyone else have a similar experience or heard of this problem?
Otherwise the engine is in OK shape. No evidence of overheating. There are quite of bit of chatter marks on the rotor housings, the rotor bearings seems pretty well worn but probably re-usable. -- David Leonard
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