Volvo U.P. 170 HP I/O 226 Cubic Inch Engine - MARINE - WATER IN OIL?

Coach

Rookie
A friend has a boat with two Volvo engines for his I/O drives. One engine has water in the oil and he has not been able to trace the cause.
Can you provide any solutions? He is quite able to do a lot of the work himself.
He is also interested to know if there might be any identical engines for sale that he could use to replace this one.
Thanks.
 
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