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  1. #1
    Join Date
    Jun 2018
    Posts
    10

    Default Exhaust coming from open impeller housing

    Hey everyone,

    Did some research but would like some clarity.

    Upon replacing the impeller I bump started the engine with the cover off the impeller housing to see if it would help loosen up the impeller and i accidentally started the engine.

    I found that exhaust smoke was coming out of the impeller housing.

    I know the exhaust and the cooling system are connected but should the exhaust be able to find its way back to the impeller on a cold engine with a dry start?

    Is this indicative of the thermostat being stuck open?

    Thanks in advance.

    -Johnny O
    Last edited by Mushy B; 04-18-2020 at 08:09 PM.

  2. #2
    Join Date
    Jul 2010
    Location
    N.W. Suburbs Chicago, IL
    Posts
    2,307

    Default

    Not sure what you are talking about here but a totally dry impeller might smoke due to both a lack of lubrication and cooling from a lack of water. For clarity, what year boat and engine?
    '86 Comp TS6M - Reborn 2016
    Riding a HO Sports CX Ski

  3. #3
    Join Date
    Jun 2018
    Posts
    10

    Default

    My apologies,

    Its a 2005 21v launch 325 indmar assault engine.

    I didn’t check the smell of the smoke to see if it was rubber, it seemed to me like a lot of it was bellowing out after the engine had shut off though.

  4. #4
    Join Date
    Aug 2009
    Location
    London, Ontario, Canada
    Posts
    1,187

    Default

    Yes it will. All excess water and water from exhaust manifold is dumped downstream into the exhaust and exits the boat out exhaust.so if no water then exhaust will find its way to the impeller
    2009 21v Worlds 340 Cat
    run your engine after you change the oil
    Doug

  5. #5
    Join Date
    Jun 2018
    Posts
    10

    Default

    Thank you guys, that gives me peace of mind. I was thinking the exhaust would have to try and pass the thermostat before escaping the impeller housing so I was wondering if mine was stuck open.

    Thanks again!

    -Johnny O.

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