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  1. #1

    Default Crusader 454: Air in raw water intake strainer (Starboard engine)

    I have a new to me 84' Trojan 11meter Express with Crusader 454s. Just over 500hrs ea.. Closed cooling. After bringing her to her new home, I noticed the starboard raw water intake strainer was only half full of water and half full of air. The port side was still full of water. No overheating occurred. I was told the impellers were newer. The setup goes: Thru hull seacock, hose, valve, hose, strainer, hose, pump. I don't notice any leaks, but it appears that both the port and starboard strainers have been sealed with a black silicone/rubber substance, and I'm definitely not going to be opening them. Perhaps they were leaking at some point. Any ideas as to why there would be air in the strainer? While running the engine at the marina, I can clearly see water pumping and it seems to be maintaining/keeping up the half full scenario. The strainer is an older low profile brass with clear top and wingnut on top of that. Hoses look newer and the strainer only has minor debris. Thanks in advance!
    Last edited by Lawlila; 01-14-2018 at 12:10 PM. Reason: spelling error

  2. #2
    Join Date
    Dec 2006
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    Chaumont Bay, N.y., USA
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    Default Re: Crusader 454: Air in raw water intake strainer (Starboard engine)

    The setup goes: Thru hull seacock, hose, valve, hose, strainer, hose, pump.
    Ayuh,..... Sounds like a restriction at the pick-up, seacock, or hoses to the strainer,....

    On a new to you boat, the 1st thing I'd do is replace the raw water pump impellers,....
    Personally,....
    I'd throw in Globe, run-dry impellers,...
    Any Grease is Better,... Than No grease at All....

  3. #3

    Default Re: Crusader 454: Air in raw water intake strainer (Starboard engine)

    Thank you for the feedback. Ill let you know what I find.

  4. #4
    Join Date
    Sep 2008
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    Hague, Virginia, USA
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    4,257

    Default Re: Crusader 454: Air in raw water intake strainer (Starboard engine)

    You may also want to post your question on the Crusader Forum on this site. Go to top left of this page, click on Forum Home, then scroll down to the Crusader forum and make a new post there.
    CHawk 25 DLX

  5. #5
    Join Date
    Sep 2008
    Location
    Maryland - USA
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    7,338

    Default Re: Crusader 454: Air in raw water intake strainer (Starboard engine)

    I'd be inclined to think the plumbing on the suction side of the pump isn't air-tight....

    I'll expand on bondo's suggestion and say the raw water pumps should be given a major service inspection/overhaul....there are a few potential issues on the stock pumps that could lead to poor performance.

  6. #6

    Default Re: Crusader 454: Air in raw water intake strainer (Starboard engine)

    Thanks, will do.

  7. #7

    Default Re: Crusader 454: Air in raw water intake strainer (Starboard engine)

    I'll definitely be starting there. Thanks for the advice.

  8. #8
    Join Date
    Sep 2010
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    Default Re: Crusader 454: Air in raw water intake strainer (Starboard engine)

    I would take the strainers out and install ell grass strainers on the hull. Your engines will be happier.

    I have the same boat in a 10 meter.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

  9. #9

    Default Re: Crusader 454: Air in raw water intake strainer (Starboard engine)

    Quote Originally Posted by Docksidemarineservices View Post
    I would take the strainers out and install ell grass strainers on the hull. Your engines will be happier.

    I have the same boat in a 10 meter.
    Forgive me, but what are ell grass hull strainers? I Googled it but can't find a manufacturer or part number. Thank you.

  10. #10
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    Default Re: Crusader 454: Air in raw water intake strainer (Starboard engine)

    Quote Originally Posted by Lawlila View Post
    Forgive me, but what are ell grass hull strainers? I Googled it but can't find a manufacturer or part number. Thank you.
    Look here. My Mistake EEL grass strainer.

    https://www.generalpropeller.com/234...RoCrxoQAvD_BwE
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

  11. #11

    Default Re: Crusader 454: Air in raw water intake strainer (Starboard engine)

    Quote Originally Posted by Docksidemarineservices View Post
    Look here. My Mistake EEL grass strainer.

    https://www.generalpropeller.com/234...RoCrxoQAvD_BwE
    Right on. Thank you for your time. I was thinking it may be a partially clogged thru hull. Gonna start with an impeller first though because it's gonna cost me 450 to just have the boat lifted out of the water .

  12. #12
    Join Date
    Dec 2015
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    Default Re: Crusader 454: Air in raw water intake strainer (Starboard engine)

    Dive in the water and check the ports in the hull are clear.
    It takes a nickle to go first class!
    If it aint broke dont fix it!!

  13. #13

    Default Re: Crusader 454: Air in raw water intake strainer (Starboard engine)

    I love being on the water, just not under it.

  14. #14
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    Default Re: Crusader 454: Air in raw water intake strainer (Starboard engine)

    Quote Originally Posted by Lawlila View Post
    I love being on the water, just not under it.
    Ayuh,... How long has it been since the thru-hull has been cleaned, 'n inspected,..??

    How long since the hull has been cleaned for that matter,..??
    Any Grease is Better,... Than No grease at All....

  15. #15

    Default Re: Crusader 454: Air in raw water intake strainer (Starboard engine)

    Quote Originally Posted by bondo View Post
    Ayuh,... How long has it been since the thru-hull has been cleaned, 'n inspected,..??

    How long since the hull has been cleaned for that matter,..??
    The boat was out of the water just over a year ago for cleaning and bottom paint. I borrowed a buddy's waterproof GoPro and attached it to a pole and was able to get a few decent video clips of the thru hulls to make sure I didn't have a clog and they look OK. It appears the bottom paint may have narrowed the slots slightly but I don't think enough to cause a problem. I'm going to scrub them with a nylon brush attached to a pole next. I ordered impellers and will do them after they arrive. I'll keep you posted with updates as I finish!

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