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Sea Ray
 BoatUS Boat Groups/Manufacturer Forums>>Sea Ray
Subject Topic: Water loss from Heat Exchanger to Coolant Post ReplyPost New Topic
 
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bobdunagan
"Seaman Recruit"




Joined: December 14 2004
Posts: 7
Posted: January 06 2009 at 17:46 | IP Logged Quote bobdunagan

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

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midway
"Seaman"




Joined: June 19 2004
Posts: 39
Posted: January 09 2009 at 12:49 | IP Logged Quote midway

From what you describe my first thought is compression getting in the cooling system and blowing the coolant out of the overflow, why you are not showing overheat I do not know. Before you run much you need to check for exhaust gas in the cooling system. How much coolant do you have to add back to the system? Is your pressure cap holding proper pressure? Something to start with, hope it will be of some help.

__________________
1994 GMC K1500 2004 Sea Ray 185 Sport 4.3L Alpha I
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bobdunagan
"Seaman Recruit"




Joined: December 14 2004
Posts: 7
Posted: January 09 2009 at 13:52 | IP Logged Quote bobdunagan

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

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midway
"Seaman"




Joined: June 19 2004
Posts: 39
Posted: January 09 2009 at 14:42 | IP Logged Quote midway

The switching of caps could work, if the cap is the problem you should lose coolant from the port engine after the swap and not from the S/B engine. The proper check is to get a radiator pressure tester with cap adapter and test it that way. If the cap is not the problem you will still lose coolant from the S/B engine and not the port.

If the cap is not the problem then I would be looking at the head gaskets as the likely cause. One check for exhaust gas is to run engine without the cap and look for bubbles in the water, the best is to get the kit to check with, probably can get from the auto pars store. If you are blowing the coolant out fast enough to drop the coolant level away from the temp sending unit before overheat shows up you would never know you were overheating since the sending unit only measures water temp and not air temp.


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1994 GMC K1500 2004 Sea Ray 185 Sport 4.3L Alpha I
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