Dealing with air lock on AC pump

capecodcruiser

Active Member
Aug 1, 2008
525
Falmouth, MA
Boat Info
2001 310, 350 HO's/Vdrives.
Engines
Mercruiser MPI 350 HO's
Just thought I would throw this out there to help someone else possibly. Most times when I had to start my AC for the first time I would always have to go and remove the discharge hose, get sprayed with water once it primed and than hope it didn't happen anymore. I am working on my boat on the hard in prep for 2020 season(long story) and just going thru all systems. I installed this valve to ease the priming problem. All plastic parts and it worked perfectly when tested. Hope this helps someone else out.
 

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Sometimes it is just easier to hold a water hose end to the hull discharge for 30 seconds. That will push water back through the system and out the bottom of the hull (seacock has to be open).

If you picked up mud or any other obstruction.....it will clear it out. The AC should be switched off for the procedure.
 
I’ve had a problem with the bridge AC on this when hauled and then put back in but not the main pump for the other three units. I close the sea cock before hauling then reopen when back in the water. Also put a tee with a bleed line & hose to the bilge. Obviously if you’re winterizing the boat closing the valve with water in line is a no no!
 

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