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Stripped oil drain plug!

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  • Stripped oil drain plug!

    I have a 2016 Mercury 20hp 4 stroke with a stripped engine oil drain. Can anyone tell me if a ‘piggyback’ drain plug will work to fix this? The mechanic said he couldn’t put in a helicoil and a new oil pan would be over $1,000...

  • #2
    find a new mechanic. Helicoil or other threaded insert would be the fix.
    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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    • #3
      That was my first thought...

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      • #4
        If the pan is not thick enough a heli won't work. Could remove the pan, and braze or weld a weld nut in place

        If there is room, tap to next larger side plug

        For that matter, remove, weld closed, drill and tap to original size
        94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
        95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
        07 Seadoo GTX
        Merc Adults Only VP Adults Only
        G-Dad always said "First Liar doesn't stand a chance"

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        • #5
          Removing an oil pan on a 4 stroke can involve a lot of work.

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          • #6
            FInd out if Merc has a Service Bulletin regarding stripped Oil Pan Drains.

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            • #7
              Piggyback should work if you can find the right thread size.
              Medford, WI


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              • #8
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                Gee, how about using a flush bushing thru the original hole, with a pipe fitting on the inside to fasten it. It would require removal of the pan.

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