6bta 370 – Anti-freeze discharge in exhaust

[Michael]

My Starboard motor was running great until yesterday.  Started the motor after re-fueling from a day of fishing and saw antifreez dumping out the exhaust. I quickly shut it down and putted back to slip with one motor.  After she cooled down, with my limited mechanical skills, I started to attempt a diagnosis.  Pulled the air filter thinking turbo gasket, nothing; pulled dipstick nothing unusual there; puller the sea water discharge hose off the heat exchanger and started motor, antifreeze poured into the bucket.  This is where I stopped.  Now the questions:

1. Pressure test the heat exchanger?
2. How do I know if the head gasket or block cracked is the issue, no visible signs of anything outside leaking?
3. Before I fill the shopping cart with unnecessary parts, what are my next diagnosis steps?

I’m rather anal about checking gauges, temp and pressures were great on the ride in.  I did not pump out all the antifreze.

Thanks for any help in advance.

Mike

 

Topic

[Rob Schepis]

The heat exchanger is the only place on the engine that seawater and coolant run side by side.  Pull the heat exchanger and figure out where the breach is.

[Author]

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