Wondering if someone can help me out with a problem I have with my Aq130C which seems to get water in the oil nearly every year. I took the boat out when I left checked oil and was fine. Got to a fishing spot checked it again then water in the oil. The engine was purring and plenty of power before it happened. Took off my JP impeller housing noticed small water pool on the engine crank side of impeller. Also noticed floating O ring blocking the tell tale hole. Upon bringing the impeller home, rang the Volvo Dealer he now tells me it could actually be the exhaust manifold severely blocked causing back pressure exhaust to return back up the water intake pipe causing pressure to blow water back through the impeller. Or blocked water cooled oil cooler. Now more confused than ever as to what it could be. Running fresh water the water out of the leg is was luke warm after 15-20 mins of running . When it was running out on the water before it happened temp gauge showed 89°C. I will admit I have been using after market seals and O rings to rebuild the impeller. Engineer also told me if chamber of the housing is scored or scratched water will get through the seals, and to consider re-honing it. If anyone could help me nut out, to what the most likely cause would be. I've since order another secondhand housing and genuine rebuild kit. The boat is stored 200 km away so want to be prepared for all likely scenarios. Would be greatly appreciated.