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I have a rotax 582, it is running ok but I noticed an oil spill on the rotary valve oil bottle after I had been flying. Cleaned it up and next time after a flight it is oily again and to the rear of the bottle on the inlet hose it is oily too. It is coming out of the oil filler but there is nothing wrong with the filler cap, it has to breath, but it is because the level of oil is not dropping in fact it is rising. I presume I have some sort of blowback from the crankcase and what started out as the oil level slightly below the full marker is now well above the full marker.Anyone else had this and what is the answer and remedy?Gyromac
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That"s not the rotary valve oil bottle Sam.
I believe water can get into the rotory valve oil through a leaky seal that separates the oil from the water. Long time sinc I had 2 strkes Aussie Paul.
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The only way that the centre crankcase chamber can make oil is to add something to it - in this case only air or water. Air, if a crankshaft seal leaks on a sump compression stroke, or water if the inner waterpump seal is faulty.If it is an air leak, the level should stabilize over night as the fine bubbles purge from the system (the hoses from the crankcase should always run uphill to the bottle). You can sometimes also pick out air bubbles rising to the top while the engine is under load. (look in bottle with top removed and the gyro tied to a tree)If it is a water leak, the oil would would be slightly milky.A water pump seal is cheap to replace, a crankshaft seal is not.
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Is the coolant milky as well?
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