Refilling fresh water cooling circuit on a Volvo MD7B - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 10-22-2010
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Refilling fresh water cooling circuit on a Volvo MD7B

Recently I tried for the first time to replace the impeller and gasket on the fresh water pump. I removed the front plate to access the old impeller and obviously all the coolant from the block and the heat exchanger poured into the bilge. I've put in the new impeller and screwed the faceplate back onto the pump. Now I'm wondering how should I refill the system with the right amount of coolant in order to avoid air bubbles. Start the engine and keep pouring coolant into the heat exchanger until it overflows? Or should I fill the recovery bottle and let the pump siphon the coolant back into the cooling circuit? I have no idea...

Also, what is the recommended mix of coolant and water to be used in this particular heat exchanger? 50/50? Regular water will do or do I need distilled water?

Any help will be appreciated.
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Old 10-22-2010
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50/50 mixture is correct. Same as an auto. You can buy it premixed if you want. I wouldn't start it dry and filling throught the recovery bottle won't work. Top off through the cap on the heat exchanger, run the engine and add as necessary. It may take a bit of bleeding to get all the air out of the system.
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Old 10-24-2010
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All the information I needed, thanks so much.
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