Milky fluid

[Jbdlwb]

Hi there I’ve been watching this form for a long time and it has help me rebuild my 1971 Sangster Marine. I’ve got a 70 horse Johnson on it with the help of this forum. I was able to take apart the carburetters and rebuild them. I also was able to diagnose and replace a voltage regulator but now I come to you asking for help.
The other day I was out in the ocean and I noticed a weird smell. I turned off my engine and sniffed around when I got to the engine I realized there was a large piece of kelp covering each side of my water intake. So I took it off when I went to restart my engine. It did not start. I also have battery issues. I need a new battery, just haven’t got it yet. When I cranked over I could hear the hiss of steam.

I used our kicker motor to get us back to the dock and then load up and go home. When I got home, I noticed a milky fluid in the bottom cylinder when I took out the spark plugs, I haven’t tried starting at since. I am wondering what might cause an issue like this? Should I do a compression test?

motor model J70ELCIM

thank you for your time

 

[racerone]

Blown head gasket.-----Or one of the 3 gaskets on the exhaust manifold covers is leaking.

 

[Jbdlwb]

Blown head gasket.-----Or one of the 3 gaskets on the exhaust manifold covers is leaking.

How do I find out which one? headgasket should be simple. Are the exhaust ones tough? Where would you buy parts?

 

[Nordin]

First check the compression in all cylinders.
If low or no compression in bottom cylinder you have a bad head gasket.
To pull the exhaust cover and check the gasket can be a PIA.
The bolts that holds the cover can snap really easy and you have to drill them out and retap the threads.

 

[Jbdlwb]

All three cylinders. I double checked them as well.
What do you think the issue could be now?

 

[Nordin]

Check the gaskets at the exhaust cover, BUT be careful the bolts can snap really easy.
If they are hard to loosen penetrate with penetrating oil, heat them with a propane torch and tap them with a hammer.
Move them back and forth with small steps.