Volvo Penta tmd40a adds slowly water to the overflow tank

Nunuwawa

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4 May 2021
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Hello all

I have one engine Volvo Penta tmd40a which adds slowly water to the overflow tank
I tested the heat exchanger for leaks but no leaks to find, used a bit pressure and put under water to check.
I have no idea where it comes from, the raw water circuit is actually very simple
raw water pump and strainer, then to the oil cooler, from oil cooler to the heat exchanger, then to the gearbox cooler
and finely to the exhaust elbow.
Anyone any idea?

Thank you

Walter
 

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