coolant loss troubleshooting recommendations? - Page 3 - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #21  
Old 03-12-2007
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Actually that is kinda cool for most diesels so it doesn't seem like there is any overheating issue. Based on the fact that you are not losing any fluid at the dock...it may be an underway issue with the engine under load. Given Pigslos comments I am leaning to the tranny oil cooler now.
I would definitely pull some fluid out of your tranny and check it for contamination.
As to damage... I would like to tell you to leave the dock and motor a while but if that sucks coolant into your tranny or engine block you could have big problems. Again...I would change the oil inspect it and inspect the tranny fluid. If there is no evidence of contamination in either...I would then take the boat for a run under power and see if fluid levels go down. If they do...check oil and tranny again and if there is no contamination it is almost certainly one of your exchangers.
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Old 03-12-2007
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ok thanks. the oil doesnt look 'greenish'. i havent checked the transmission fluid except a quick glance the other day to see if it was topped off. again i don't remember anything green. the heat exchanger we took out a little while ago and there wasnt anything 'noticeable'. i guess if its the heat exchanger that just means coolant is leaking out into the raw water system and being flushed out?
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Old 03-12-2007
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You said you had the cylinder head gasket replaced?
My thought would be that this is where you issue is.
Instead of leaking externally as it was it is now leaking a very small amount of collant water into a cylinder, but only under load.

You might try simply torquing the cylinder head bolts down to spec. Perhaps they were not tightened properly.

Beyond that it would really be something that one would have to see.

Good luck!

Todd
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Old 03-12-2007
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thanks all. i guess i know how next weekend will be spent!
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Old 03-13-2007
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Certain head gaskets still need a second torqueing after a certain amount of hours. Many newer ones are torqued once at installation. Nevertheless I think you will find your problem in that area, as it was worked on most recently. Was the head checked for warpage when the gaskets were done? Your local auto mechanic will probably have a tester that samples your coolant for hydrocarbons. As previously stated, the oil pressure is much higher than coolant pressure and so the oil will show up in the coolant first. Check around with a few mechanics. I think you need to sample the coolant hot-ask the mechanic with the tester.
I am also in agreement that your engine is running a little cold. 180 degrees is generally considered the point at which your most efficient combustion and, more importantly, you begin to burn out moisture and impurities from the engine's lubricating system. A cold running engine also hastens the demise of everything down stream from the exhaust manifold.
Good luck. I'm bettin' on the head.
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Old 03-18-2007
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Quote:
Originally Posted by camaraderie
Actually that is kinda cool for most diesels so it doesn't seem like there is any overheating issue. Based on the fact that you are not losing any fluid at the dock...it may be an underway issue with the engine under load. Given Pigslos comments I am leaning to the tranny oil cooler now.
I would definitely pull some fluid out of your tranny and check it for contamination.
As to damage... I would like to tell you to leave the dock and motor a while but if that sucks coolant into your tranny or engine block you could have big problems. Again...I would change the oil inspect it and inspect the tranny fluid. If there is no evidence of contamination in either...I would then take the boat for a run under power and see if fluid levels go down. If they do...check oil and tranny again and if there is no contamination it is almost certainly one of your exchangers.
well i m still w/o a solution, both tranny and oil fluids a fine, and no white smoke out the back. cylinder head is torched up. hoses seem tight and no tell tale green drip. i replaced the radiator cap but i m not sure thats going to result in anything............i guess i need to take the heat exchanger out and get it tested again?
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Old 03-18-2007
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If you are still losing coolant...that is all I can think of. Bummer...boat stuff is never easy!
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  #28  
Old 03-19-2007
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My bet is still on a faulty gasket and you are loosing water into a cylinder. Hard luck!
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Old 03-19-2007
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Quote:
Originally Posted by Idiens
My bet is still on a faulty gasket and you are loosing water into a cylinder. Hard luck!
anyway to check if thats the problem w/o taking off the cylinder head?
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Old 03-19-2007
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Not easy on a diesel, no plugs to pull, sorry.
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