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Overheating at idle

Discussion in 'Luhrs Yacht' started by Rich Plukas, Jun 19, 2020.

  1. Rich Plukas

    Rich Plukas New Member

    Joined:
    Feb 10, 2020
    Messages:
    28
    Location:
    Rochester, NY
    Posting as an FYI because it took me awhile to find solution to this issue. Temps perfect at all speeds except idle on the port. After re checking impeller that I changed earlier, new thermostat even though I didn't think that was it and replacing impeller housing (read about a minute crack being the issue on one forum) still couldn't figure out. Took temps at various spots on both engines and then started pulling hoses and comparing water flows. Turns out water flow restriction between strainer and engine was being caused by a bad seal on the strainer cap and it was sucking in air and preventing full water flow! Ugh, so simple.

    As an aside- my intake strainers actually sit at and slightly above the water line which I haven't seen before on other boats. Is this common with Luhrs? Good news is with the seacock open I won't flood on a leak issue.
  2. AMG

    AMG YF Moderator

    Joined:
    Jul 26, 2004
    Messages:
    5,295
    Location:
    Sweden
    Hi,

    I once had a similar issue, with an even more simple explanation. The insert did not slide all the way down where I have made the red circle, so when I was tightening the lid, it was still not in full contact with the seal and the air could get in, causing overheating at idle...

    So by just wiggle the insert so it goes all the way down and the problem is solved.

    Strainercap.jpg
  3. Rich Plukas

    Rich Plukas New Member

    Joined:
    Feb 10, 2020
    Messages:
    28
    Location:
    Rochester, NY

    Thanks, glad I'm not the only one. I feel kinda silly. I shoulda asked first!