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  1. #1
    Join Date
    Jan 2004
    Location
    Dallas, TX
    Posts
    2

    Default 2001 Indmar knock sensor threads corroding

    I have a raw water cooling system on a 2001 Launch with 5.7L Indmar, and I run in fresh water. My knock sensor threads are the only place I notice corrosion, and they don't seem to last as long as they used to. Is there perhaps a sacrificial anode somewhere that has worn out and needs to be replaced?

  2. #2
    Join Date
    Jul 2007
    Location
    Flowery Branch Georgia
    Posts
    2,581

    Default

    I have a 08 Nautique 210 5.7 the knock sensors screw into a adapter that screws into the block. You may want to check with PCM .

  3. #3
    Join Date
    Jan 2004
    Location
    Dallas, TX
    Posts
    2

    Default

    Quote Originally Posted by michael hunter View Post
    I have a 08 Nautique 210 5.7 the knock sensors screw into a adapter that screws into the block. You may want to check with PCM .
    Thanks. Any idea what type of material the adapter is?

  4. #4
    Join Date
    Jul 2007
    Location
    Flowery Branch Georgia
    Posts
    2,581

    Default

    looks like steel I noticed a little deterioration on the end but the boat has over 1200 hours. dorman and ebay has them . Google knock sensor adapter.
    Last edited by michael hunter; 11-26-2020 at 07:56 AM.

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