mercruiser 120hp water in oil

[nearpar]

I purchased a boat with a mercruiser 120 it seems to run great. However I changed the oil it was all milky. Compression is good on all cylinders. The only thing I did notice was some steam commingl out of the number 3 spark plug hole when I removed the plug. Is this a cause for concern? Where would I look for the problem? Cracked block? Cracked head? Head gasket? Manifold? .......help!

Thank you in advance.

 

[HT32BSX115]

Re: mercruiser 120hp water in oil

I purchased a boat with a mercruiser 120 it seems to run great. However I changed the oil it was all milky. Compression is good on all cylinders. The only thing I did notice was some steam commingl out of the number 3 spark plug hole when I removed the plug. Is this a cause for concern? Where would I look for the problem? Cracked block? Cracked head? Head gasket? Manifold? .......help!

Thank you in advance.

Howdy,

Sounds like you need to do a cooling system pressure check.

You may have a cracked block....... If that's the case, another engine will be in order.


Regards,


Rick