I think there are two on the raw water pump, one on the inlet side and one on the outlet side, but if you lay next to the motor on the pass side they are right behind the fuel filter(looks like an oil filter) I believe they are one on top of the other, not sure about the rest, maybe hook up a fake a lake to your water intake and see where water comes out of the motor, there's only one way in and 2 ways out thru each exh manifold so that should help narrow it down, don't forget the little o rings too.
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