Dealing with air lock on AC pump

Discussion in 'General Maintenance/Repair Questions' started by capecodcruiser, Aug 14, 2019.

  1. capecodcruiser

    capecodcruiser Member

    442
    Aug 1, 2008
    Falmouth, MA
    2001 310, 350 HO's/Vdrives.
    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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  2. PlayDate

    PlayDate Well-Known Member

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    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.
     
  3. Gimme Time

    Gimme Time Active Member

    791
    Jan 7, 2007
    Charlottesville, VA./ Deltaville, VA
    2006 52SB, Ray Marine E120, Garmin 7612 through BOE site sponsor,
    QSM11s
    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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