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Message |
    
eddie zuskin
New member
Username: ezuskin
Post Number: 1
Registered: 04-2008
| | Posted on Sunday, April 20, 2008 - 10:39 pm: | 
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I'm open to any suggestions. I am doing all the basic maintenance that had been neglected for a few years. During a one hour trip to move the boat to its new home the starboard heat exchanger used at least 1/2 gallon of antifreeze. It was also overheating above 2000rpms.
I rebuilt raw water pump and resolved the kinked hose leading to it.Temp seems OK now. I can't find any evidence of head gasket issues, no milky oil or steam cleaned plugs. I thought next suspect would be heat exchanger but a mechanic at my marina suggested the blank plate/gasket at the joint where the manifold meets the elbow. Something about that gasket seperates the raw from the fresh water down there and could be allowing the antifreeze into the exhaust.
Eddie Zuskin
1982 Carver 3396/transplanted 1975 M440B Chryslers |
Fastjeff
Senior Member
Username: fastjeff
Post Number: 4321
Registered: 09-2003
| | Posted on Monday, April 21, 2008 - 05:38 am: |
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Very possible. I suggest bottowing a cooling system tester and presurizing it where the cap goes on to see where it's leaking, AutoZone has tools like this they lend out.
Jeff |
eddie zuskin
New member
Username: ezuskin
Post Number: 2
Registered: 04-2008
| | Posted on Monday, April 21, 2008 - 08:09 pm: |
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Jeff,
If it holds pressure does that send me back to headgasket?
What would I need to disassemble to see where coolant is going if it bleeds off the pressure? Elbow? Riser?
Eddie |
Fastjeff
Senior Member
Username: fastjeff
Post Number: 4323
Registered: 09-2003
| | Posted on Tuesday, April 22, 2008 - 06:46 am: |
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If it holds pressure, I'd suspect the cap itself is leaking. If not, yes; you'll have to start disassembling to find out where it's leaking. I'd start with the exhaust system.
Jeff |
Fastjeff
Senior Member
Username: fastjeff
Post Number: 4324
Registered: 09-2003
| | Posted on Tuesday, April 22, 2008 - 06:46 am: |
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If it holds pressure, I'd suspect the cap itself is leaking. If not, yes; you'll have to start disassembling to find out where it's leaking. I'd start with the exhaust system.
Jeff |
Peter H
Member
Username: pfhlaw
Post Number: 13
Registered: 05-2006
| | Posted on Tuesday, April 22, 2008 - 12:15 pm: |
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If it holds pressure and you no longer are loosing coolant you may have just had an air bubble in the closed part of your system that has now been burped. |
eddie zuskin
New member
Username: ezuskin
Post Number: 3
Registered: 04-2008
| | Posted on Friday, April 25, 2008 - 06:39 pm: |
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I was able to borrow a tool to, at least, finish ruling out a head gasket problem. Its a Snap On tool that sucks up air from the air space in the top of a radiator through blue liquid that turns yellow at the presence of any Hydrocarbons(CO2). All clear so back to heat exchanger/exhaust for the diagnosis. I saw clean oil and dark plugs so no sign there of head gasket issue.
Eddie |
Thomas Fastiggi
New member
Username: tominflorida
Post Number: 3
Registered: 09-2007
| | Posted on Saturday, April 26, 2008 - 03:19 am: |
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I had a friend with a similar problem. It turned out that engine was the one used for heating the hot water heater exchange unit and once he topped off the coolant level in the spring for that it never dropped again. |
