Zincs. What do they do?

Discussion in 'Sport Boats' started by LawyerMan, Aug 16, 2012.

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  1. JimG

    JimG Well-Known Member SILVER Sponsor

    Nov 4, 2008
    Southern WV
    2007 310 DA
    Kohler 5ECD
    Twin 350 Mags
    Raw Water Cooled
    V-Drives
    Yes, definitely replace the missing one. The bolt threads into the anode from the top. Some will have a fin used to set the low speed tracking. You should be able to find a replacement at any marine store or dealer.
     
  2. LawyerMan

    LawyerMan Member

    424
    Jul 12, 2012
    Texas Gulf Coast
    270 SLX w/ Sport Arch
    496 Mag DTS, Bravo III, Corsa
    Thanks. I'll replace that one and clean the others.
     
  3. chandalen

    chandalen New Member

    367
    Aug 7, 2011
    Alexandra Bay,NY
    '83 Sundancer 270, Humminbird 593c
    Twin merc 305, with new SEI 106 drives
    It looks like in the last picture that, that is the anode your missing:

    On MY drives... (Alpha 1 (SEI106)) the hex nut can only be installed or removed when the upper and lower units are seperated. The bolt is then tightened through the hole in the upper unit onto the trim tab anode. I noticed that THIS anode wears faster than the other ones on my boat. (or maybe its just more noticable)

    I have been told, that this anode also assists in slow moving steering. I can not confirm or deny this, however I can say that the Skeg itself DOES assist in slow speed steering.
     
  4. LawyerMan

    LawyerMan Member

    424
    Jul 12, 2012
    Texas Gulf Coast
    270 SLX w/ Sport Arch
    496 Mag DTS, Bravo III, Corsa
    Should there be one covering the prop nut on my boat (alpha one)?
     
  5. chandalen

    chandalen New Member

    367
    Aug 7, 2011
    Alexandra Bay,NY
    '83 Sundancer 270, Humminbird 593c
    Twin merc 305, with new SEI 106 drives
    I do not have an anode for the prop, and I have not seen one in the ready to use kits. However, MY Alpha ones (gen 1) maybe yours are gen 2?? do not have an anode on the cavitation plate as yours appears to. Nor do I have anodes on my trim thrusters. (my anodes are on the bolt you see in your first pict top right).

    I have the exact same trim line anode. VERY IMPORTANT, under that trim line anode, on the boat itself there is a hole for some crazy reason. included in the anode kits is a rubber grommet that closes this hole. Failure to close this hole, will result in a steady stream of water into your bilge. (can you guess how I found this out?)

    The anode I believe you are missing looks like a mini skeg (for an Alpha 1 gen 1), someone above mentioned it may be flat? Again, if yours is a gen2 I'm not sure of the anode differences.
     
  6. LawyerMan

    LawyerMan Member

    424
    Jul 12, 2012
    Texas Gulf Coast
    270 SLX w/ Sport Arch
    496 Mag DTS, Bravo III, Corsa
    I purchased this one: http://www.ebay.com/itm/Lower-Trim-..._Accessories_Gear&hash=item53ee2a21c5&vxp=mtr

    I called to verify the fit (they cross-referenced my outdrive serial number).

    Tanks for your help guys.
     
  7. LawyerMan

    LawyerMan Member

    424
    Jul 12, 2012
    Texas Gulf Coast
    270 SLX w/ Sport Arch
    496 Mag DTS, Bravo III, Corsa
    Is the grommet located on the top of the outdrive?
     
  8. rcknecht

    rcknecht Active Member

    Mar 23, 2009
    toms river,nj
    340 Sundancer 2001
    T 454 MPI
    I keep that grommet on my boat. It covers the hole for the screw that attaches the zinc you purchased. I believe the post before is referring to another rubber grommet.
     
  9. LawyerMan

    LawyerMan Member

    424
    Jul 12, 2012
    Texas Gulf Coast
    270 SLX w/ Sport Arch
    496 Mag DTS, Bravo III, Corsa
    Any idea where I can purchase the grommet? I checked with West Marine - no dice.
     
  10. chandalen

    chandalen New Member

    367
    Aug 7, 2011
    Alexandra Bay,NY
    '83 Sundancer 270, Humminbird 593c
    Twin merc 305, with new SEI 106 drives
    Lawyer:: that anode is the type I have that i believe you are missing.

    The grommet is the black mushroom looking thing on the left of this picture.

    grommet.jpg
     
  11. Gunn

    Gunn Active Member TECHNICAL Contributor

    Oct 4, 2006
    Potomac River - MD
    2003 280DA and 1995 Sea Ray 175
    Twin 4.3l and 3.0l, all w/ AlphaI GenII drives
    For your missing anode, there is no grommet to worry about. And as far as I recall, you can change that one without removing the lower unit from the upper. Ther is a little rubber cober that goes over the bolt hole, but it is not critical to have.

    The fin style is nice as you can set it at an angle to help you steer straight at low speed, but when I changed my prop it interfered and I had to use a flat plate style.

    And you do have an Alpha I Gen II drive.
     
    Last edited: Aug 23, 2012
  12. LawyerMan

    LawyerMan Member

    424
    Jul 12, 2012
    Texas Gulf Coast
    270 SLX w/ Sport Arch
    496 Mag DTS, Bravo III, Corsa
    I didn't know it was a Gen II drive. Thanks for that extra piece of information. How can you tell?
     

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