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  1. #1

    Default Ditch the water pump?

    I've got what I believe to be a 71 stringer, and I'm rebuilding it as cheap as I can. I'm repowering it with a different engine and I plan on cooling it with a normal radiator and electric fans. I will also route the exhaust up with some form of a stack and mufflers.

    Can I omit the water pump in the outdrive and block off the water intake? Or is the water used for something else besides cooling exhaust and engine.

    Thanks.

  2. #2
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    9,721

    Default Re: Ditch the water pump?

    You are underestimating the cooling requirements of a marine engine.
    What you are planning to do will not work very well.


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

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

  3. #3

    Default Re: Ditch the water pump?

    I'm going to be using a Mercedes 3.0L i5 turbodiesel, it shouldn't be too hard to cool with enough fans for Airflow, and I'll be using a much larger radiator in place of the original one with the car.
    But if it becomes a problem, I'll consider a water to water radiator and use an electric pump for the seawater.

  4. #4
    Join Date
    Sep 2010
    Location
    ontario
    Posts
    14,890

    Default Re: Ditch the water pump?

    And have you observed that there are water jackets on both side of the upper gear box to cool the oil , yes or no ?

  5. #5
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    9,721

    Default Re: Ditch the water pump?

    What you are proposing to do is not only foolish, but it will most likely cost you more in repairs in the future !
    You may be very skilled, and you may be a very good mechanic, however the simple fact that you are wanting to eliminate the see water cooling indicates that you are not experienced in the Marine world .

    Do it correctly… Do it once… And go boating safely!
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP's

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

  6. #6

    Default Re: Ditch the water pump?

    Quote Originally Posted by racerone View Post
    And have you observed that there are water jackets on both side of the upper gear box to cool the oil , yes or no ?
    No, I have the upper all apart, but haven't really looked at it too hard. I figured it was just how they got the water up through it.
    If it really needs cooling, I'll do it, but I just figured the less seawater flowing through it, the less corrosion.

  7. #7
    Join Date
    Sep 2010
    Location
    ontario
    Posts
    14,890

    Default Re: Ditch the water pump?

    Be sure to keep us informed with progress / setbacks on this project.----Nothing ventured means nothing gained.----Wishing you much success with it.

  8. #8

    Default Re: Ditch the water pump?

    OK fine, Yall win, I'll get a heat exchanger. Once I can afford it though.
    I just figured that generators and field water pumps did alright sitting in one spot with their radiator and fan, so why wouldn't they in a boat. But I guess it's just going to be loud and hot all the time.


    Quote Originally Posted by racerone View Post
    Be sure to keep us informed with progress / setbacks on this project.----Nothing ventured means nothing gained.----Wishing you much success with it.
    I'll try to, I should get the engine mounted to the outdrive bellhousing this weekend.

  9. #9
    Join Date
    Sep 2010
    Location
    ontario
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    Default Re: Ditch the water pump?

    Have to ask you how much hp it takes to move a pickup truck at 60 mph on a level road.----And how much power is required to move your boat at 40 mph on the river ?

  10. #10
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    9,721

    Default Re: Ditch the water pump?

    OK fine, Yall win, I'll get a heat exchanger.
    You will not regret doing that.
    Liquids (seawater and ethylene glycol) are much more efficient at transferring heat from one media to another!


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

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

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