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Leaking Engine Coolant |
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CharlieHCAN
Lieutenant Joined: 28 January 2021 Location: Canada Status: Offline Points: 24 |
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Posted: 14 February 2022 at 15:02 |
Gang a little more of an update and also a question ...it appears now that I have found where the drips are located and need help identifying what the part on the engine this is ...I believe it is the raw water lines that feed into the heat exchanger to cool the coolant. I believe the gasket is the problem, this is the rear of the engine I have the Volvo D2-75F model - in the pic you can see the yellow drip at the bottom gasket. Thoughts ? I am going to talk to a Volvo mechanic this week and order the gasket and replace it - will take draining the raw water lines (also shutting the seacock for raw water off) and coolant in the engine before completing ...uploads/6969/Coolant_Leak_notes.pdf
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Charlie
2012 Hanse 470 - "Good Humour" |
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CharlieHCAN
Lieutenant Joined: 28 January 2021 Location: Canada Status: Offline Points: 24 |
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Ok Gang I thought I would give an update on the hot water tank isolation to see if the coil was split and leaking ....unfortunately it wasn't the tank! In the process of disconnecting the coolant lines I discovered the pressure release/drain valve on the tank to be leaking and when I went to drain the tank I discovered it was time to replace the tank due to rusty water pouring out at the bottom of the tank draining! I decided to upgrade and install a 40 Liter tank and she's working better than ever .... so now I am going to buy some UV dye and a black light and run that through the cooling system to try and trace the leak to its origins! I will update once I have any information!
Charlie
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Charlie
2012 Hanse 470 - "Good Humour" |
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Bruno
Commander Joined: 13 August 2014 Location: Bromont, Quebec Status: Offline Points: 104 |
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Charlie, I discovered antifreeze under my engine and under the floor of the main cabin after a sailing weekend. The engine alarm was going on at low engine speed. After looking all over, I discovered that it was the overflow plastic tubing going to the overflow bottle that was disconnected...stupid as that.
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Bruno
Hanse 400, 2010 Hull 660, Canadian flag sailing Lake Champlain, VT USA |
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JonB
Rear Admiral Joined: 21 September 2010 Location: Cowes Status: Offline Points: 504 |
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If there's leak with the coil inside the heat exchanger (clarifier), as the freshwater (non-engine) system is under pressure with the pump on, so if you remove the pipes that come from the engine to heat the water, then any crack in the coil will show in the form of a continual leak and the the water pump running to maintain pressure!
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Jon B
470e http://www.norse-king.blogspot.co.uk |
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CharlieHCAN
Lieutenant Joined: 28 January 2021 Location: Canada Status: Offline Points: 24 |
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Wild thanks for the drawing and conformation - that's my thoughts as well - Ill let you guys know the results once I can get to the boat and find some time!!
Appreciate all the brains working on this one ...this forum is a great place for running ideas past some salted sailors!! Charlie
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Charlie
2012 Hanse 470 - "Good Humour" |
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Wild
Vice Admiral Joined: 18 March 2010 Location: Turkey-Greece Status: Offline Points: 784 |
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Charlie
This is how I suggest to test IMO the fastest way to do it. If there is a leak in the coil inside the waterheater(boiler) ,under pressure Fresh water will pass by the leak inside the coil and finely come out the disconnected coil (heatexchanger) connection. If there is a leak and the pressure of the fresh water system is higher than inside the Volvo cooling system Fresh water slowly coming in to the engine. With the engine running and hot ,the pressure inside the Volvo will become to high and the pressure safety valve on top op the engine wil open and fill up the expansion tank and the coolingwater will end in to the engine compartment by the overflow. Just my thought
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Wild and Wet
Belgium 545e#268 |
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Fendant
Admiral Joined: 03 November 2012 Location: Switzerland Status: Offline Points: 1617 |
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I had a small leak from the inner circle coolant pump, which was unnoticed for probably several month.
Coolant leaked out and got absorbed by the oil binder mat Doe to elevated temperatures in the engine room these mats dried quickly. Check the coolant level in the translucent reservoir. Check the surrounding surfaces for any suspicious traces. Do not mix the green Volvo coolant fluid with red one from other sources.
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Frank
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Wayne's World
Admiral Joined: 18 July 2012 Location: Cruising Status: Offline Points: 1111 |
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Charlie,
We had a leak of Volvo coolant into the engine bilge which was from the plastic engine coolant header tank. If the coolant pipework in the heater was leaking into the water heater water it would be very diluted and and water coming out the over pressure valve on the water heater would be very light green (Volvo coolant colour is green normally). If the water in your bilge is "coolant green" then it is probably coming from the engine directly into the bilge. I would check all the coolant pipework connections for leaks and especially the header tank pipework. The D2 Volvo branded engine is very different to our D3. But the piping of the coolant and the water heater circuit are very similar. Good luck. |
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Wayne W
Cruising, currently in the Caribbean and will head across the Pacific early 2024 |
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JonB
Rear Admiral Joined: 21 September 2010 Location: Cowes Status: Offline Points: 504 |
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Volvo's have a habit of warping their aluminium heads. Have you at anytime run a hot engine whether having the revs up to 3000rpm+ to either 'clean' the exhaust or to get you out of a situation?
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Jon B
470e http://www.norse-king.blogspot.co.uk |
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CharlieHCAN
Lieutenant Joined: 28 January 2021 Location: Canada Status: Offline Points: 24 |
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Thanks gang for the replies and pics - helpful!
Wild : I like your idea but I have something to run by you on this idea but I may be wrong - so lets say the spiral/llop/coil (whatever is the official name) in the hot water tank does have a crack or leak. If I was to plug the inlet/outlet and pressurize the water system by turning on pump - the leak wouldn't show up as the water cant get out the coolant lines?? What the assumption is with this theory of the coil leaking is the engine coolant is being replace by water in the coolant system? Maybe the right step is if I shut the coolant supply off to the loop as TOBO suggested with valves then try to duplicate the coolant leak again by running the engine and having the water pump pressurized after shut down to see if I find coolant in the engine bay. Therefore it would suggest a leaking coil and coolant is being replaced by water into the system?? Does that make sense or did I confuse the situation even more ...Im still very confused though where the leak is on the engine itself. Jon what's leaking isn't water its coolant (yellow for Volvo) into the engine bilge. Thanks again Charlie
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Charlie
2012 Hanse 470 - "Good Humour" |
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