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  1. HeadAbove

    3.0L Raw Water Intake & Drain Port Questions

    Yeah, I'm feeling more confident about doing that now 👍. I did figure out that I'll need an additional bushing after I remove the plastic "T" from the manifold drain. (Mercury p/n 22-862557). All good.
  2. HeadAbove

    3.0L Raw Water Intake & Drain Port Questions

    Thanks. Yes, an air "admittance" vent is my best guess, too. But as I remove my sterndrive at the end of every season and also disconnect the raw water intake at the HE, that hose has all the opportunity it needs to drain from both ends without the additional vent. The installation instructions...
  3. HeadAbove

    3.0L Raw Water Intake & Drain Port Questions

    Thanks, Scott. Helpful detail. I did understand the principles of both systems, I just couldn't reconcile those principles with what I thought I was seeing in my boat. Turns out I completely misremembered the set-up and it wasn't until I could get into it today that I resolved most of my...
  4. HeadAbove

    3.0L Raw Water Intake & Drain Port Questions

    Thanks. I'll get some pics together ASAP.
  5. HeadAbove

    3.0L Raw Water Intake & Drain Port Questions

    Hi All, Mercruiser 3.0L (1A311803); Aftermarket closed cooling half-system; A1G2 drive. I'm trying to simplify my current hoses, routings and drain process, mainly because the PO who installed the aftermarket closed cooling system left some of the superfluous OEM fittings in place. (I've read...
  6. HeadAbove

    3.0L TKS Spacer Block Missing

    Very cool. Thanks for those links, Fun. (y) So definitely a structural brace, then. I'll find one to install. Maybe I'll notice a reduction in vibration when I do... 🤷‍♂️ Rob
  7. HeadAbove

    3.0L TKS Spacer Block Missing

    #4 on this diagram: https://www.mercruiserparts.com/bam/subassembly/30908/13603/210 ...Not that it explains much.
  8. HeadAbove

    3.0L TKS Spacer Block Missing

    Hi All, Quick intro: Former sailor and current owner of a 2008 20ft Bayliner I/O cuddy, a Mercruiser 3.0L TKS motor (s/n 1A311803) with a closed cooling half-system and an Alpha One Gen II sterndrive. Used exclusively in salt water. In the 4 years I've owned the boat, I've been working my way...
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