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Post by Deleted on Apr 21, 2014 16:41:46 GMT
I have noticed that my engine, an MD2030, spits out a bit of coolant liquid during operation. The engine is equiped with an additonal cannister for the coolant and this is positioned above the engine. I cannot find leak traces in the system so I think the only cause is the hose which is connected to the filling cap on the engine. But with this additional cannister I would expect that the expanded coolant, due to temperature rise, would flow back in the cannister. Now I think of replacing the hose with a longer one and route it like a gooseneck to level it with the cannister.
Has anyone got an idea if my conclusion is right and that this would solve the issue of cleaning the engine bay after each trip.
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Post by On y va on Apr 21, 2014 16:51:50 GMT
Usually it means replacing the intercooler metal cap, as the internal valve doesn´t work anymore. Yanmar´s do have this problem too.
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Post by Deleted on Apr 21, 2014 19:56:06 GMT
What do you mean with the metal cap. Is this the cover of the intercooler housing? I have spoken a few more Penta owners and they all have this issue, as if it is common and normal. Our engine has only 392 hours on the clock and is cooling fine. I cannot imagine it to be a faillure or something. Furthermore I cannot find any leak traces. It is difficult to monitor the engine during operation due to the stair that is blocking the view.
Perhaps I need to give it more time in the marina to have the coolant heating up and to expand, as I expect that to be the reason
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Post by puravida35 on Apr 21, 2014 21:02:14 GMT
Different engine, but may be similar issue. I would find an ounce or so of coolant in the engine compartment floor occasionally. All hose connections and filler cap were fine. Turned out that a drain plug built into the lowest point of the coolant hose had loosened up slightly. The plug and it's receptacle were held in place with a non-adjustable hose clamp. Replaced that with an adjustable hose clamp and the leak ceased.
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Post by electricmonk on Apr 27, 2014 8:22:29 GMT
Usually it means replacing the intercooler metal cap, as the internal valve doesn´t work anymore. Yanmar´s do have this problem too. I agree the "radiator" caps they fit are very poor quality and I've seen many fail - without more details renewing the cap would be my first response. EDIT: Unfortunately its not unknown for the "new" replacement to leak as well such is the quality of these things! |
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Post by Deleted on Apr 29, 2014 19:16:15 GMT
What is the function of the cap, is it a kind of pressure relieve valve , and how does this result in leaking of the coolant?
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Post by On y va on Apr 29, 2014 20:59:21 GMT
This cap regulates the pressure, so coolant flows into the expansion tank and vice versa. If the cap doesn´t work properly, it just spits it out.
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Post by Deleted on Apr 30, 2014 16:07:14 GMT
In my case the expansion tank is positioned higher then the hose which runs down aside the engine. So simply using a longer hose with a kind of elbow that levels the expansion tank height won't bring a solution? Isn't it a matter of cleaning and lubricating the cap valve?
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Post by electricmonk on May 1, 2014 15:37:45 GMT
If we make the assumption that it is the cap that's leaking then sometimes cleaning it up and lubricating it with silicon grease can stop it from leaking, don't forget to clean up the mating face on the top of the heat exchanger as well. As I have said before these fittings are a throw back from the bad old days of car radiators circa 1960 and they are very poorly made.
More info: The cap on the heat exchanger is just a cap it has no pressure relief valve or other function, it should just keep the coolant in. The cap on the expansion vessel is a bit more complicated, it is a pressure relief valve as the coolant expands letting air out and air inlet valve as the coolant cools down and contracts so the seals in the water pump don't get sucked inside out!
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Post by Deleted on May 1, 2014 19:31:46 GMT
You've got me mixed up now. The cap on the expansion tank is just a plastic cover , nothing more. The cap on my intercooler has a the hose from the expansion tank as input and a drain house as output. So I thought you explained there is a valve in that cap and when it get stuck it will spit out the coolant through the drain hose rather then feeding back into the expansion tank. Now you say the intercooler cap is just a cap. In my case there is no trace of leaks from the cap itself.
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Post by Peter123 on May 1, 2014 21:10:34 GMT
I had similar problem. Simply replaced the metal cap (like a standard old fashioned radiator cap) on top of the engine .. I got a cheap generic one .. seems to be all fine now
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Post by electricmonk on May 2, 2014 13:40:04 GMT
Well there you go yet another variation.
What you describe is probably the most complicated way of doing a simple job PLUS if its working properly you will find coolant under the engine as every time the coolant heats up and expands it vents to be replaced from the expansion tank when the engine cools down - a total loss system. Sounds like a Volvo special . . . .
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Post by Deleted on May 7, 2014 9:29:34 GMT
Okay, I think I will visit a local Volvo representative for advise on a modification.
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