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Telltale for 165 Mercruiser

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  • Telltale for 165 Mercruiser

    Hi I have 165 Mercruiser with a heat exchange system. I am paranoid about running the impeller dry. Could I run a telltale jet like an outboard by tapping into the raw water system with a small 1/8th or 1/16th line running to somewhere I can see?

  • #2
    No reason you can't, but unless you're going to be watching the telltale (and not where you're going ) the whole time, you're better off setting up a pressure switch and alarm system.
    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
    The world takes on a whole new perspective when viewed from 100’ below.
    1972 Bertram ‘Bahia Mar’ 20
    2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
    (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


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    • #3
      Apologies for the slander...but don’t these have their own permanent tell tale ?....oh no wait....that’s just the water pump seal, head and cooling water leaking. Sorry couldn’t resist. Forgive me.

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      • #4
        Originally posted by malrv1 View Post
        Hi I have 165 Mercruiser with a heat exchange system. I am paranoid about running the impeller dry. Could I run a telltale jet like an outboard by tapping into the raw water system with a small 1/8th or 1/16th line running to somewhere I can see?
        Ayuh,...... Find a water pressure gauge used for an outboard in a speed boat,......

        Glancin' at a gauge is better than starrin' at a tell tail stream,.....

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        • #5
          Change the impeller every other year!
          Terry
          87, 4WINNS H 190
          470/Alpha I

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          • #6
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            a $20 water pressure gauge used on an outboard, plumbed to the hose just after the raw water pump would work. however simply changing the impeller regularly while doing all the other annual maintenance is the best way to prevent issues.
            Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

            1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

            Past Boats
            1970 Wooster Hellion - Merc 9.8
            2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
            1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

            What’s behind you doesn’t matter.Enzo Ferrari

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