BTW, the cam screw is what tells me the orientation of this pump, and that it needs to rotate CW (viewed from front) in order to work with the inlet below, and with the outlet above.
Flit this pump 180* and it will be correct for CCW rotation (viewed from front).
So Rick, from what you're telling me, the pump shown needs to be flipped? again..this is my Starboard engine.
If your Stbd engine is most likely a counter-rotating engine... I.E. RH Reverse Rotation like this........... correct?
If so, then your Sherwood pump will be in this orientation when viewed from the front.
(inlet/outlet ports to the left..... impeller off to the right side turning in a couner-clockwise direction)
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This is not your pump (below), but is in the same orientation as our RH Engine pump's impellers.
It is turning CCW when viewed from the front of the engine.
Look at the action as the impeller rotates CCW.
This is the "counterintuitive" part at first glance.
The vanes are just leaving the cam and are just opening from the cam action.
As the space between the vanes becomes larger, suction is created, and it pulls in sea water.
As the space between the vanes becomes smaller (from cam action at the other end), the sea water is forced into the outlet and on to the engine.
OK... switch gears for a moment, as I do not have an image for a RH Reverse engine pump.
This is a Sd LH Engine Sherwood pump (below) as though viewed from the front of the engine.
The blue area shows incoming sea water..... the yellow area shows the outgoing sea water as it's being compressed by the folding action of the vanes via the cam.
Again.... this Sherwood is for a Sd LH Rotation engine.... just think of this as though you are looking at a mirror image for a Rev RH Rotation.