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  1. #11
    Join Date
    Apr 2020
    Location
    Prince George Canada
    Posts
    329

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    Still haven’t solved my overheating issue. Replaced both the fresh water impeller and the thermostat. Not sure where to go now. After replacing the thermostat and topping up the coolant, I brought the engine up to temperature, it shot right past 160 and I shut it down at 180. At around 160 I expected to see the coolant reservoir level to drop, as I am suspecting that I still need to add more coolant, but it didn’t go down. Anybody have any ideas what might be happening?
    2020 Moomba Mojo
    2008 Mastercraft Prostar 197 40th Anniversary
    Owner Ness Lake Watersports
    Wakemakers “Exact Fit” Bags + Lead = 4,700 ballast
    Audio by Wetsounds, MTX, JL Audio, Clarion
    15 X 13.00 ACME prop

  2. #12
    Join Date
    Jun 2020
    Location
    Utah
    Posts
    277

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    Could your heat exchanger be plugged? We were having issues with a separate boat and found impeller pieces in the exchanger, resulting in the over temperature issues due to low water flow.


    2016 Moomba Mojo Surf Edition
    2000 Sharpe Houseboat 70x16 (Lives at Lake Powell)

  3. #13
    Join Date
    Apr 2020
    Location
    Prince George Canada
    Posts
    329

    Default

    Not sure, the impeller that I removed was in perfect condition.
    2020 Moomba Mojo
    2008 Mastercraft Prostar 197 40th Anniversary
    Owner Ness Lake Watersports
    Wakemakers “Exact Fit” Bags + Lead = 4,700 ballast
    Audio by Wetsounds, MTX, JL Audio, Clarion
    15 X 13.00 ACME prop

  4. #14
    Join Date
    Apr 2020
    Location
    Prince George Canada
    Posts
    329

    Default

    That large hose that comes ofF the thermostat housing is not hard or warm when the engine is up to temperature. I replaced the thermostat and no improvement.
    2020 Moomba Mojo
    2008 Mastercraft Prostar 197 40th Anniversary
    Owner Ness Lake Watersports
    Wakemakers “Exact Fit” Bags + Lead = 4,700 ballast
    Audio by Wetsounds, MTX, JL Audio, Clarion
    15 X 13.00 ACME prop

  5. #15
    Join Date
    Mar 2021
    Location
    South Georgia
    Posts
    2,070

    Default

    I had what Zog had happen in my old boat, too. But if your impeller was fine, maybe it sucked up something else, or possibly just corrosion or some other buildup that needs backflushing to get out.

    Sent from my SM-G781V using Tapatalk
    2021 Moomba Makai
    Black Cherry Metal Flake & Fire Red
    Nibral OJ 15.5x15 Altitude/Wake prop w/1.76 trans v-drive
    Wet Sounds bow speakers & 10's on the Tower & ported sub

  6. #16
    Join Date
    Jan 2021
    Location
    Columbus, Ohio
    Posts
    1,363

    Default

    I can fix this for you.

    I had the same issue and had to MacGyver it on the water.

    From the top of the coolant reservior there is a small 1/4" hose.
    Remove it at the reservoir and insert a small funnel and fill with coolant.
    It will take forever but mine took 3/4 gallon of premix.
    Once full, reconnect to reservoir.
    Start the boat and watch Temps. It should burp air now.
    Top off the reservior as needed.
    Engine should stay cool on fake a lake.

    FYI...this procedure is straight from the Indmar manual.
    Last edited by Holdmybeer; 09-05-2024 at 09:45 PM.
    2015 Moomba Mojo Surf Edition
    4,000lbs
    Manual Flow

  7. #17
    Join Date
    Jan 2021
    Location
    Columbus, Ohio
    Posts
    1,363

    Default

    Tommy,
    You ever get your overheating issue resolved?
    2015 Moomba Mojo Surf Edition
    4,000lbs
    Manual Flow

  8. #18
    Join Date
    Sep 2017
    Location
    Ft Gibson Lake OK
    Posts
    435

    Default

    Quote Originally Posted by Tommy2slow View Post
    Not sure, the impeller that I removed was in perfect condition.
    Sorry kind of late on this one. Don't keep adding straight coolant to it, add distilled water. The coolant they use is very particular on the concentration, too high it will overheat in an instant, and of course too low it will freeze.
    2021 Makai

  9. #19
    Join Date
    Apr 2020
    Location
    Prince George Canada
    Posts
    329

    Default

    Thanks for the coolant advice, I added a 50/50 premix, but always good to remind the members. That coolant is super pricey btw! Could only find one supplier in my small town and it is almost $100/gallon (for premix!!!).

    Haven’t resolved the issue yet. I tapped out, parked it for the season, and booked an appointment for next week with a local shop that does my winterizations.

    I spoke with the service department for the Skiers dealer in BC, where I bought the boat, and they suspect the heater system. Apparently they are prone to vapour lock.

    I will provide an update after I get it back from the dealer.


    Sent from my iPhone using Tapatalk
    2020 Moomba Mojo
    2008 Mastercraft Prostar 197 40th Anniversary
    Owner Ness Lake Watersports
    Wakemakers “Exact Fit” Bags + Lead = 4,700 ballast
    Audio by Wetsounds, MTX, JL Audio, Clarion
    15 X 13.00 ACME prop

  10. #20
    Join Date
    Apr 2020
    Location
    Prince George Canada
    Posts
    329

    Default

    The went to the dealer last week. After a few days of trouble shooting and working with the Indmar specialist at my dealer over the phone, I am no closer to resolving the issue. There is a possibility that pump for the heater is failing and causing enough restriction to inhibit coolant flow. Unfortunately, the dealer had already winterized the boat so we couldn’t bypass the pump and run it up to temp. Will have to try it again next spring.
    2020 Moomba Mojo
    2008 Mastercraft Prostar 197 40th Anniversary
    Owner Ness Lake Watersports
    Wakemakers “Exact Fit” Bags + Lead = 4,700 ballast
    Audio by Wetsounds, MTX, JL Audio, Clarion
    15 X 13.00 ACME prop

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