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  • F90 stuck anode

    Just bought a boat that came with a 2003 F90 and it appears the anodes were never replaced. The one in the exhaust cover came out with no problem. The lower one in the head came out with a tool I made with lots of twisting . There is only a small point left and the hole is totally blocked with salt and corrosion. The upper one will not budge when applying ,what I think, is a lot of pressure. Thanks for any ideas? Also, is this an interference engine as the timing belt is also original with 556 hours?

  • #2
    A 2003 F90 is an interference motor.

    Regarding removal of the anode, I am guessing that a slide hammer with a bolt screwed into the anode could be used to fish it out. Or a long drill of the right diameter to drill the anode into submission.

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    • #3
      Thanks for the info on the engine. The anode in this engine has two bolts that attach it to the head. There is a third in the center that secures the anode. I have tried to remove the center bolt but its very small and I don't want to ring it off as whats left of the anode may fall into the water jacket. . The other two came out with normal pressure. I have it covered with penetrant soaking overnight. Hopefully that will help.

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      • #4
        If the center bolt will not come loose you should be able to purchase the cover and a new anode together from this site on the parts link. That's what I had to do when the bolt twisted off on my F115.
        Dennis
        Keep life simple, eat, sleep, fish, repeat!

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        • #5
          Thanks for the reply. That will be an option once I am able to get it out of the block. Right now the anode and the cover are stuck tight in the block. The two cover bolts are out and I made a tool that fits in the two holes . I welded a bolt on my tool and with a socket and breaker bar it will not budge. I actually broke two bolts that I welded to the tool and had to weld a larger bolt to it. It still wont turn. Tomorrow I'm going to a 1/2 inch breaker bar. We shall see.

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          • #6
            Originally posted by haybailkiller View Post
            Just bought a boat that came with a 2003 F90 and it appears the anodes were never replaced. The one in the exhaust cover came out with no problem. The lower one in the head came out with a tool I made with lots of twisting . There is only a small point left and the hole is totally blocked with salt and corrosion. The upper one will not budge when applying ,what I think, is a lot of pressure. Thanks for any ideas? Also, is this an interference engine as the timing belt is also original with 556 hours?

            Seems if there is a lot of salt and corrosion left blocking things up you are going to have to pull things apart to clean it all up

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            • #7
              Unfortunately you may be right.

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              • #8
                I'd put a heat gun to it and loosen/ almost melt the grommet which is rubber.

                The anode will be rotted away (it's not hanging up), the rubber seal will still be there, distorted/stuck, but still there.

                Lean on it with a 1/2" breaker bar and you may very well break it off. At least add heat before doing so...

                http://www.boats.net/parts/search/Ya...202/parts.html
                Last edited by TownsendsFJR1300; 01-09-2018, 06:30 AM.
                Scott
                1997 Angler 204 CC, 2006 F150 TXR

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                • #9
                  Got it with the tool l made and the larger bar. I'll try to get a picture soon. Thanks for your replies
                  I saw the heat gun suggestion after I got it out. Thanks

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                  • #10
                    If you get to chipping away at the blockage,keep a shop vac handy to suck out all you can so it does not go somewhere and block off passages

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                    • #11
                      Thanks , that's what I did. Must have gotten a half pound of salt.

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                      • #12
                        IMG_20180109_100433317_2.jpg The tool I made that broke the anode seal free. It took several modifications to get the desired results. Then just clean out the mega load of salt in the water jacket. I don't know why this engine didn't overheat . Total blockage behind both head mounted anodes. If your in salt water make sure you check yours each year. Thanks again for all the replies.

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                        • #13
                          If you you were able to get that much out of the anode "holes" do you think you may need to go deeper? Remove the jacket and inspect? Broken bolts are a valid concern...

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                          • #14
                            Originally posted by pstephens46 View Post
                            If you you were able to get that much out of the anode "holes" do you think you may need to go deeper? Remove the jacket and inspect? Broken bolts are a valid concern...
                            To add to the above, you may want to at LEAST do a citric acid flush or rydlem flush.

                            Usually, the lower cylinder water jacket and head are blocked up the worst(over time, use, heat from the engine cooks the salt to the innerds of the block, especially when turned off)..
                            Last edited by TownsendsFJR1300; 01-09-2018, 07:53 PM.
                            Scott
                            1997 Angler 204 CC, 2006 F150 TXR

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                            • #15
                              Have you also removed and inspected the thermostat?

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