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Just removed the oilpan on my 3.0 engine. Cranked on the pulley and heard a blowing sound from the pistons / cylindersleeves during compression. I also saw that there where bubbles in the remaining oil laying in the bottom of the piston (engine upside-down).

I know the purpose for a crankcasev ventilation, but am i supposed to hear the phenomen?

Just changed pistonrings/gaskets 3000 milas ago. But the crankshaft oilseal (rear) started to leak after a 100miles. The engine though run perfect.

Do i have a problem or is this air normal?

/christian

some air will get by the rings at your slow rate of hand cranking...and sometimes you can hear it. Valves set correctly? What was your compression after rebuild?

170-180 PSI in compression. Valves set correct. i don´t think there´s any problems, just got paranoid. Will install the engine this weekend.

Sounds good! Run it!!