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Pere...
Pull this trick:
Get two good men and true.
Loosen the fittings on the pipe just DOWNSTREAM of the siphon break, but do not disconnect them yet.
Start the motor, and run it up to operating temperature, and leave the motor running.
Send the other man up to the cockpit and have him standby to stop the motor.
Now, quickly, pull the hose off the DOWNSTREAM side of the syphon break. Water will fly everywhere and when it does, shut down the motor immediately.
Now watch those air filters again. Does the water drip out this time? If it does NOT, then the problem is very likely to be the syphon break.
If it still does, then suspect that the exhaust manifold is breached.
I speak from a little experience, in 1997, in the semi dark of the motor bay, I fitted one of the three exhaust gaskets on the Volvo MD17c (raw water cooled) the wrong way round such that the seal between exhaust and entry coolant was lost. The symptoms were exactly as you describe. It would run fine, but dripped out of the filters when shut down.
A corrosion breach would give the same symptoms. I doubt if you have a corrosion breach. They really corrode very slowly indeed. If you have a breach, you can re-skim the exhaust manifold for a few bucks, assuming the material loss is in the manifold.
Whatever you do, do not let that motor lock up on you.
Rockter.
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