1973 MC 165hp inline 6 milky oil

[boatnut74]

I have a 165 inline 6 I just picked up and the oil is milky. I found one small hairline crack in the block on the port side. I pulled the pushrod covers and found no visible cracks. I believe this sat outside for awhile so I'm wondering if it might be just from rain. I was curious weather there were and other spots on the block to look for cracks. I am willing to partially disassemble it as it probably needs new gaskets anyway.

 

[Bondo]

Re: 1973 MC 165hp inline 6 milky oil

I have a 165 inline 6 I just picked up and the oil is milky. I found one small hairline crack in the block on the port side. I pulled the pushrod covers and found no visible cracks. I believe this sat outside for awhile so I'm wondering if it might be just from rain. I was curious weather there were and other spots on the block to look for cracks. I am willing to partially disassemble it as it probably needs new gaskets anyway.

Ayuh,.... Pressure test the block to find the cracks,...

 

[boatnut74]

Re: 1973 MC 165hp inline 6 milky oil

I did a pressure test on the block. I removed the spark plugs, pushrod covers, crankcase breather and oil fill cap. I filled with about 20psi of air and the only leak I could find was the external one on the block.