Carl - thanks for yuor reply. Here is all I know about the 'split overhaul'. It does sound strange. I don't have immediate access to the engine logs, but here is what my uncle sent me:
I just spoke with (mechanic for last 5 years), who maintains the 150 regarding the engine times.
The engine was "majored" with the exception of the cylinders at the request of the previous owner. The aircraft then logged only about 200 or so hours over the next 8 to 9 years, i.e. it essentially sat.
(new owner) purchased the plane, and immediately noticed that the engine was throwing oil on the bottom of the fuselage. During the next annual, they had low compression on one cylinder and found a burnt ex. valve; which was corrected with a rebuilt cylinder. The expectation that the oil throwing would stop did not happen, so they removed all four cylinders, sent them out for complete rebuild with new pistons, etc.
Since the final top overhaul, there has been no problem, nor any oil throwing from the engine. Because they like to keep the oil topped, they also added the air-oil separator at that time. Whenever high oil is stirred or splashed in a crankcase, there is a tendency for the oil breather to pass it out and dirty the bottom of the airplane. Because they didn't know if the oil throwing was caused by breather issues or cylinder issues, they wanted to make sure they fixed the problem, and prevented it in the future. Between the new top overhaul and the air-oil separator, the oil stays inside the engine, and everything appears to be really great.
Last edited by newmem75; 02/15/06 07:42 PM.
