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Thread: Stumped

  1. #31
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    11,009

    Default Re: Stumped

    805HD, I just read back through all of your threads.
    While this may wrinkle the feathers of the Merc aficionados (and no offense intended), why don't you consider doing this:

    1.... abandon the use of the A seawater pump.
    You will still need to keep it active as it provides A drive upper unit cooling. You can route this water over-board.

    2..... install a thru-hull pick up system.

    3..... install a crankshaft pump if you have the necessary space in front of the harmonic balancer.

    This would at least eliminate the potential issue of not enough seawater from the A drive seawater pump!

    Click image for larger version. 

Name:	Crankshaft pump 5.jpg 
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    4..... if you cannot install a crankshaft pump, go with the Merc style belt driven seawater pump.

    Either the crankshaft pump or the Merc belt driven pump will provide more seawater than what the A drive pump is capable of.


    .
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  2. #32

    Default Re: Stumped

    Quote Originally Posted by kghost View Post
    I have been reviewing So as i asked a bit more details with photos would help a lot!
    Bit of an update for you..
    Last edited by 805HD; 07-15-2019 at 09:12 PM.

  3. #33

    Default Re: Stumped

    UPDATE***
    Apologies for continually digging up a old thread.

    Okay so I got an update for you guys who have all been so helpful, I ran the water volume test and passed with flying colors.. A little over 4.5qts in 15 seconds @ about 8-900rpm. I then verified the same amount before and after the thermostat housing (thermostat still out of the housing)

    The boat IS getting enough water. I have eliminated the impeller and any restrictions up to the circulating pump that might be slowing down flow. I am now hoping the circulating pump on the block which is a Napa brand automotive and not marine is the culprit. Going to replace with a OEM.

    I mean what the heck else could it be?!?!
    Will report back!

  4. #34
    Join Date
    Jun 2006
    Location
    Spotswood, NJ, USA
    Posts
    4,769

    Default Re: Stumped

    In your video at the 5.05 mark you say the tstat fits on top of the housing, that is incorrect, the t stat goes inside the housing and the brass collar goes on top. Pretty sure
    Last edited by Bt Doctur; 07-15-2019 at 09:46 PM.

  5. #35

    Default Re: Stumped

    Quote Originally Posted by Bt Doctur View Post
    In your video at the 5.05 mark you say the tstat fits on top of the housing, that is incorrect, the t stat goes inside the housing and the brass collar goes on top. Pretty sure
    you are correct, when I got the boat (which had no overheating issues) the thermostat was on top of the brass collar. I tried it both ways with the same results. Also replaced the thermostat housing. Same results.

    The circulating pump is automotive and not marine, at this point it is the only variable that has not been assessed. Thatís my next step.

  6. #36
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    16,092

    Default Re: Stumped

    Good luck and let us know how you make out.

    Jeff

  7. #37

    Default Re: Stumped

    Definitely would replace with a marine circulation pump - marine will have a bi directional impeller and be made of corrosion resistant materials. Likely the automotive unit is corroded inside if u don’t have closed cooling

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