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  1. #1
    Join Date
    Dec 2010
    Posts
    150

    Default Loss of engine water at higher revs

    Hi All
    I have a TAMD41B Volvo Penta...runs well and starts on the button....but on occasion at at revs over 2250 the engine water stops coming in...no water in the stainer .
    I have fitted a new water pump / impellers / and cleared the impeller debris from the cooler stack / new water piping and strainer and O rings on the gear box in and outlets as in coming water goes there before the pump.
    Went out for a test today ....no change...am I looking in the wrong place ?

  2. #2
    Join Date
    Nov 2004
    Location
    fareham hampshire
    Posts
    1,711

    Default Re: Loss of engine water at higher revs

    Quote Originally Posted by Sundowner 39 View Post
    Hi All
    I have a TAMD41B Volvo Penta...runs well and starts on the button....but on occasion at at revs over 2250 the engine water stops coming in...no water in the stainer .
    I have fitted a new water pump / impellers / and cleared the impeller debris from the cooler stack / new water piping and strainer and O rings on the gear box in and outlets as in coming water goes there before the pump.
    Went out for a test today ....no change...am I looking in the wrong place ?
    Check that you have a constant rise (without dips) of the water pipe from inlet to waterpump have seen this causing problem.

  3. #3
    Join Date
    Dec 2010
    Posts
    150

    Default Re: Loss of engine water at higher revs

    Will check tomorrow..cheers

  4. #4
    Join Date
    Dec 2001
    Location
    north ayrshire
    Posts
    439

    Default Re: Loss of engine water at higher revs

    Seems odd that the gearbox coolers are sited before the pump, pumps usually push better than they pull, would it be easy to re plumb the system so the water goes straight to the pump to then be forced round all the coolers?

  5. #5
    Join Date
    Nov 2002
    Posts
    2,680

    Default Re: Loss of engine water at higher revs

    Have you done any work on the water inlet, the only time I have seen a similar fault was when the water pickup had been installed facing aft so at a certain speed the waterflow under the hull created a negative pressure stopping water from going up to the pump. This is the normal installation on sail boats as they don’t go fast enough to create a negative effect, but power boats can experience this.

  6. #6
    Join Date
    Dec 2010
    Posts
    150

    Default Re: Loss of engine water at higher revs

    Thanks Beamisken ...my thoughts exactly but this is a 1992 build and has original layout.....however I will think about change......
    Spannerman....same applies but again it is possible to make a change......currently there is just a hole in the steel flush with the hull.....although she has 200 hp she is not a greyhound but faster than my last yacht ...so again I will experiment on next lift out.

    Today I noticed there seems to be a moment of vacuum in the strainer when it goes from bubbling away to almost flat calm but by opening the strainer very slightly happy bubbling returns as pressure is released.

  7. #7
    Join Date
    Dec 2005
    Location
    Live London
    Posts
    3,761

    Default Re: Loss of engine water at higher revs

    Could you buy a cheap go pro copy on eBay and film the stainers and hoses so you can see what is going on when it happens?

  8. #8
    Join Date
    Oct 2003
    Location
    west yorkshire
    Posts
    3,958

    Default Re: Loss of engine water at higher revs

    Re gearbox coolers, donít change the design, they are correct.
    Another vote for checking the water inlets under the boat, possible someone has fitted new sea cocks and skin fittings and put them on backwards

  9. #9
    Join Date
    Dec 2010
    Posts
    150

    Default Re: Loss of engine water at higher revs

    Hi Kashurst
    The seacocks may have been changed but they match the rest so maybe not !.....there are no skin fittings as such only a pipe welded to the hull and threaded to receive a fitting.....it is becoming a bit of conundrum ....I would just hand it over to Volvo but they have no idea either and at 70 plus euro an hour that might be V expensive.....I am in Utrecht at the moment.
    Thanks

  10. #10
    Join Date
    Oct 2003
    Location
    west yorkshire
    Posts
    3,958

    Default Re: Loss of engine water at higher revs

    What boat is it and has it been re-engines?

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