8.1 Phosphoric acid / Barnacle Buster rinse

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by SeadawgVB, Sep 7, 2017.

  1. JVM225

    JVM225 Well-Known Member

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    That's a great idea! If worse comes to worse, maybe I can extend the tube.
     
  2. M Prod

    M Prod Active Member SILVER Sponsor GOLD Sponsor

    516
    Oct 6, 2017
    North Vancouver, BC
    2005 Sundancer 340
    Aquapro Dinghy w/ Honda 8hp
    Kohler 5KW Genny
    Raymarine Electronics
    8.1 Horizons /V Drives
    Hey guys ...is barnacle buster safe for the impellers? I ask because it suggests removing the impellers on their website, but that's for the circulation method which I assume would be a needed step for that to work. Obviously removing impellers on my 8.1's is a job in and of itself, so I'd like to avoid that if at all possible. Plan is to pull 7gals of barnacle buster in through the on board flush system and let sit for a few hours, then flush. (port engine is running hot)
     
  3. fr8dog

    fr8dog Active Member

    250
    May 25, 2012
    Florida
    460 Sundancer 2005
    Cummins 480 CE
    I talked to the Barnacle Buster people and they assured me it would not harm the impellers. I flushed both raw water sides almost a year ago and have had no problems.
     
  4. M Prod

    M Prod Active Member SILVER Sponsor GOLD Sponsor

    516
    Oct 6, 2017
    North Vancouver, BC
    2005 Sundancer 340
    Aquapro Dinghy w/ Honda 8hp
    Kohler 5KW Genny
    Raymarine Electronics
    8.1 Horizons /V Drives
    Great ...thank you!
     
  5. 66pony

    66pony Member

    569
    Oct 2, 2008
    Minnesota
    280 Sundancer 2008
    496/BIII,
    just a thought, if you are worried about impellers, don't forget all the hoses that attach to everything else. I would be concerned more about them.
     
  6. M Prod

    M Prod Active Member SILVER Sponsor GOLD Sponsor

    516
    Oct 6, 2017
    North Vancouver, BC
    2005 Sundancer 340
    Aquapro Dinghy w/ Honda 8hp
    Kohler 5KW Genny
    Raymarine Electronics
    8.1 Horizons /V Drives
    Right. Someone mentioned clamping off the hoses to the shaft seals which I had planned. Any other ones I should be concerned about?
     
  7. SeadawgVB

    SeadawgVB Member

    193
    Jul 8, 2013
    Tidewater Virginia
    '03 Sundancer 360
    Twin 8.1s with V-drives
    Your 'plan' is exactly what I did on my 8.1s and for the same reason. I think the circulation method would be required if the let it sit method produced no real results. Phosphoric acid is not very aggressive, it's probably akin to strong lime juice or strong vinegar, it is used in some soft drinks to give it tartness. Of course the concentration levels from drinks to Barnacle Buster to Klean-Strip are unknown quantities.
     
    M Prod likes this.
  8. M Prod

    M Prod Active Member SILVER Sponsor GOLD Sponsor

    516
    Oct 6, 2017
    North Vancouver, BC
    2005 Sundancer 340
    Aquapro Dinghy w/ Honda 8hp
    Kohler 5KW Genny
    Raymarine Electronics
    8.1 Horizons /V Drives
    Thanks ..yeah I’m looking forward to doing this in the next couple of weeks. Right now water pressure is anywhere from 30-50% less on port vs starboard, and port temp is 9 degrees warmer running at 3500 rpm. (Took temp at manifolds to confirm). I’ll be sure to follow up with results in this thread. Fingers crossed!
     
  9. M Prod

    M Prod Active Member SILVER Sponsor GOLD Sponsor

    516
    Oct 6, 2017
    North Vancouver, BC
    2005 Sundancer 340
    Aquapro Dinghy w/ Honda 8hp
    Kohler 5KW Genny
    Raymarine Electronics
    8.1 Horizons /V Drives
    Alright guys ...another question. I'm planning on heading down to the boat to do this over the weekend here. I'm going to do the suck up 10 gallons or so of this stuff and let sit for 6-8 hours method, then flush. I read somewhere else that the 8.1 2005 exhaust system drains the water out of the system on shut off ...this being the reason why it always takes a bit for the boat to start 'spitting' out of the sides upon startup as it has to fill up the raw water cooling system with raw water again. Is that true and if that's the case, will sucking barnacle buster in and letting it sit be effective if it's going to drain when I shut down the engine? I can't imagine it would all drain, but the heat exchangers aren't exactly sitting very low, and that's definitely one of the key components I'm targeting for this.
     
  10. juggernaut1

    juggernaut1 Active Member

    787
    Apr 19, 2015
    Perth, Western Australia
    2006 38 Sundancer
    8.1S / ZF 63V Drives
    I agree - pointless sitting in the sytem as it is not effectively flushing the exchangers. By way of example, pull the inlet of the trasmission exchanger and bugger alll water comes out so 2/3 rds or more of the of the exchanger is not being cleaned. IMO only way to do properly is to circulate the chosen solution or remove altogether and take it to a radiator shop.
     
  11. M Prod

    M Prod Active Member SILVER Sponsor GOLD Sponsor

    516
    Oct 6, 2017
    North Vancouver, BC
    2005 Sundancer 340
    Aquapro Dinghy w/ Honda 8hp
    Kohler 5KW Genny
    Raymarine Electronics
    8.1 Horizons /V Drives
    I did the soak and flush method today ....from what I can tell, really didn't make much difference. Port is still running at 165 at cruise, whereas starboard is 159. Might have helped a little.
     
  12. 66pony

    66pony Member

    569
    Oct 2, 2008
    Minnesota
    280 Sundancer 2008
    496/BIII,
    Another thing to consider, what do your water pressures run? I had an issue and my water pressure was running high along with the temperature. It was finally resolved when I took the heat exchanger ends off and cleaned it out. You can’t always flush an obstruction, sometimes you need to clean it out.
     

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