Posted: January 06 2009 at 17:46 | IP Logged

1998 370DA twin 454 Mag MPI Horizon V Drives

In routine engine check, I noticed low coolant in S/B heat exchgr and filled it. After running the boat for 2 hours with no apparent overheating, the recovery bottle was full with considerable coolant overflow in the bilge and the heat exchgr was again empty. This has now happened twice. I had recently changed the exhaust manifold, elbows and risers but hat run the boat 10 to 15 hours since this maintenance.

Has anyone had a similar problem? Any advise will be appreciated.

Bob

Posted: January 09 2009 at 13:52 | IP Logged

Thanks for the response! Right now any information will help. If you don't mind helping a little more, I have a couple of questions.

1) I am switching pressure cap from port engine to S/B engine... where the problem is occurring... to see if it helps. Is this an adequate check on "Is your pressure cap holding proper pressure?"

2)How do you check for exhaust gas in the cooling system? What would cause this to occur? Head Gasket?

Again Thank You for your help!

Bob