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Thread: Lower unit drain hole repair

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  1. #1
    Join Date
    Sep 2008
    Bend, Or.

    Default Lower unit drain hole repair

    Thought i'd share my experience with repairing a stripped lower unit drain hole on my 4hp Tohatsu. Ater researching the heck out of it i decided to not go with the heli coil... read that these don't always work out in this application and being that they advice not to use a thread locker i was afraid of the coil coming loose over time and ending up inside the lower unit housing... not to mention having to somehow remove the tag of the heli coil after installation without it dropping into the lower unit. What i went with is the Time-Sert repair kit. This insert has a lip that makes it impossible to drop into the housing, no tag to remove, and can be installed with a thread locker. The installation went great... just make sure the counter bore is deep enough so the insert ends up a hair deeper than the motor housing around the plug hole to get a water tight seal with the plug gasket.
    Last edited by SilverBullets; 04-22-2019 at 03:17 PM.


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