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3YM20 Seawater coolant pipe leak

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Got a leak from the small valve stem seal on seawater side.  The tiny valve is closed but still leaks.  (YM Part #128990 49110).  Should I replace the valve or the whole pipe?  (YM part #128990 49010). Any tips on changing old pipes is appreciated!




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Can't you simply replace it with hose?

The only diesel I've had with hard coolant lines was an old Perky 4-107 - all the rest used all hose.

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