Hi to all.
I 've got a 37 c 1981 with 2 DD325hp that sound very well except for a new problem of over heating temperature ( left 190 and right 195/198 ).
I don't think it could be a problem with headexchanger obstruction as I clean them perfectly last year.
Now the surprise is that the coolant blue became grey/black.
I put a little bit of liquid into a Coke bottle and after 5 hour the surprise: 1/4 black mud and 3/4 return to be perfect blue coolant.....
I desume that all coolant way into the motor are obstructed of mud.
What do you think about ?? Help me !!!!!!!!!!!!!!!
an italian hatteras in love.
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Thread: "black" coolant anti-freeze
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04-15-2009 12:28 PM #1Senior Member
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"black" coolant anti-freeze
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04-15-2009 01:37 PM #2Senior Member
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Re: "black" coolant anti-freeze
please suggest me how clean mud from coolant system and how avoid to accumalate mud in the future.
ciao
roby
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Re: "black" coolant anti-freeze
Are you saying that the "mud" is in the raw water portion of the cooling system (the part that picks up seawater and circulates it through the heat exchanger and then back out through the exhaust) or in the circulating portion of the cooling system (the part that contains coolant/antifreeze)?
If the raw water system picks up mud or sand, it cannot get into the coolant portion of the system unless there is a serious problem with a broken or cracked heat exchanger.Mike P
San Miguel de Allende, Mexico; Kent Island MD; San Antonio TX
1980 53MY "Brigadoon"
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04-15-2009 02:20 PM #4Senior Member
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Re: "black" coolant anti-freeze
Very difficult to diagnose problems via vague descriptions like this...I'm not even going to try....
mud color coolant...
was the circulating coolant changed last year??...and was clear blue at that time...is this DD approved heavy duty diesel antifreeze....or is it coolant??
Did you pour off the blue clear antifreeze and inspect "mud" what does "mud" mean?? thick oozy muck..... or are you describing a black color to otherwise blue normally viscous coolant?? Is the coolant circulating??
overheating....two engines overheating this year when they operated ok last year?? Was this after winter shutdown and winterizing? Did you check raw water impellers?? has the boat been hauled....could outside growth be obstructing engine intakes? Coolant at normal full level in each engine? Do you have jelly fish there which might clog intakes? Did a yard paint over your pinhole engine intake strainers??
General question: what other work was done on the engines prior to this problem....Last edited by REBrueckner; 04-15-2009 at 02:28 PM.
Rob Brueckner
former 1972 48ft YF, 'Lazy Days'
Boating isn't a matter of life and death: it's more important than that.
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Re: "black" coolant anti-freeze
Is it possible that the "MUD" is actually oil that separated out when left to stand?
Craig
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04-15-2009 02:47 PM #6Senior Member
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Re: "black" coolant anti-freeze
Oil in your fresh water system will accumulate on top of the coolant in your expansion tank....stick a finger down through the pressure cap opening and if it comes up black, yea it's oil....but why would that happen in both engines simultaneously?? that's one reason why I asked what work has been done recently on the engines....
Rob Brueckner
former 1972 48ft YF, 'Lazy Days'
Boating isn't a matter of life and death: it's more important than that.
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04-15-2009 03:03 PM #7Senior Member
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Re: "black" coolant anti-freeze
no extra job have been done on motors.
The sludge is not oil and I saw it because the plastic hose connect at pressure cap of expansion tank arrived into a plastic bottle that I have placed to keep clean the engin motor roof
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04-15-2009 03:09 PM #8Senior Member
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Re: "black" coolant anti-freeze
last year I have only cleaned head exchange with correct product ( DD authorized mechanic) but I have not change the coolant antifreeze
the sludge is only into the circulating portion of the cooling system ( the part that contains coolant / antifreezre )
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04-15-2009 03:14 PM #9Senior Member
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Re: "black" coolant anti-freeze
impeller have been correctly change one week ago and work correctly,
intake have been cleaned with my first swimming
strainer are cleaned
when I ship at 2100 rpm
both headxchange are cold
probably there are no circulation of coolant
My doubt was if sludge may closed the coolant sistem causing overheating temperature
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04-15-2009 03:18 PM #10Senior Member
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