Cobra 1100 blower motors
 

Have a big Outerlimits 47 here at our shop, boat has three engine set up, center engine starts and runs fine, however we have oil coming through the exhaust water jackets, especially after the engine is shut off. Does not build up water mix in the oil pan, instead it is emptying the oil pan and the oil is mixing with the oil and exiting through the exhaust water jackets! Both oil coolers have been replaced, thinking this may be the problem. These are Merlin Blocks first generation not Merlin III seies, any ideas? Thanks.

Sounds like oil galley is cracked to the water jacket

This exact same thing was told me by another engine builder, would this cause the oil to be drained this way and not re enter the oil pan? I have no water entering back into the oil pan that I can tell, just seems to drain it, not make it.

Differential pressures. You have greater pressure in the oil system only allowing oil to leave the system but not allow water to enter the oil system. Kind of a one way valve.

I would double check the oil coolers, can't hurt

Oil coolers are brand new and were tsted before installation, thats not the problem. Eddie Young owner and Operator of Youngs Performance Marine, told me what it is, seems allot of these older Merlin blocks experienced and issue like this.

Thanks

So you do not want to share the solution of the problem with the rest of the forum in case this issue is searched at a later date?

Good idea on re checking the oil coolers. I had new ones (on the cruiser) go bad within a few weeks. Was scratching my head wondering. Sure enough it was the new oil cooler.