Zincs

Discussion in 'Winterizing' started by Can’t Wait, Sep 21, 2022 at 7:29 PM.

  1. Can’t Wait

    Can’t Wait Member

    30
    May 24, 2022
    Boston
    330 Sundancer 1996
    Twin 454
    Does anyone know if the engines have sacrificial zincs on them? 454 7.4L
    Thanks
     
  2. jmcdboater

    jmcdboater Active Member

    172
    May 28, 2022
    Isleton, CA
    1988 Sundancer 300 Vessel JIM’N’I IV
    Twin 5.7L Mercs w/Alpha One Drives
    Koehler KVA 4 Genset
    Only parts in contact with water need to have sacrificial anodes for protection. Main engines have no need for them. Parts connected to the engines like transmissions, outdrives, prop shafts, etc. will have them.
     
  3. Can’t Wait

    Can’t Wait Member

    30
    May 24, 2022
    Boston
    330 Sundancer 1996
    Twin 454
    Thank you for the help!
     
  4. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor

    Apr 21, 2009
    PA
    Various
    Various
    Just for clarification, this isn't always the case. Anodes CAN be found inside some engines (a decent number of them, actually). However, Can't Wait's engine does not.
     
  5. bfernald0

    bfernald0 Active Member

    270
    May 18, 2020
    Marina del Rey, California
    340 Sundancer 2001
    8.2L Mercruiser ECT Horizons
    I'm not aware of any sacrificial anodes on the 7.4 mercs. The only place you find them would be the heat exchanger (if equipped) and I don't believe it has one.
     
  6. Nater Potater

    Nater Potater Well-Known Member GOLD Sponsor

    Oct 19, 2020
    Southwest Idaho
    1992 300DA Sundancer
    Twin Merc Alpha I Gen II I/O's with 5.7 V8's
    Assuming you're lake-water cooled, the anodes on the outdrive will take care of the engine.
     
  7. Can’t Wait

    Can’t Wait Member

    30
    May 24, 2022
    Boston
    330 Sundancer 1996
    Twin 454
    Thank you
     
  8. jmcdboater

    jmcdboater Active Member

    172
    May 28, 2022
    Isleton, CA
    1988 Sundancer 300 Vessel JIM’N’I IV
    Twin 5.7L Mercs w/Alpha One Drives
    Koehler KVA 4 Genset
    Ahh! A chance to learn? I did not know that, what type of engines would have anodes? Thanks for the lesson!
     
  9. Nater Potater

    Nater Potater Well-Known Member GOLD Sponsor

    Oct 19, 2020
    Southwest Idaho
    1992 300DA Sundancer
    Twin Merc Alpha I Gen II I/O's with 5.7 V8's
    My Kohler 4CZ marine generator; in the heat exchanger. Most older American car engines used the thermostat housing itself as the sacrificial anode. Others?
     
  10. jmcdboater

    jmcdboater Active Member

    172
    May 28, 2022
    Isleton, CA
    1988 Sundancer 300 Vessel JIM’N’I IV
    Twin 5.7L Mercs w/Alpha One Drives
    Koehler KVA 4 Genset
    Heat exchangers would be obvious as they have water contact…that’s very interesting @Nater Potater about thermostat housings, I did not know that. Again, to my pea brain that makes sense as the thermostats are subject to contact with the cooling water…. Good catch!
     
    Nater Potater likes this.
  11. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor

    Apr 21, 2009
    PA
    Various
    Various
    You're right that it obviously needs to be somewhere with water contact. But, for example, my 250 Yamaha has anodes in the head. Again, a water contact area, but still a place one might not normally think of. I want to say I've read that some diesels have them in the engine, as well - but I'll let others verify that.
     
    Last edited: Sep 25, 2022 at 8:33 AM
  12. Nater Potater

    Nater Potater Well-Known Member GOLD Sponsor

    Oct 19, 2020
    Southwest Idaho
    1992 300DA Sundancer
    Twin Merc Alpha I Gen II I/O's with 5.7 V8's
    Like with your Yammy, anodes can be anywhere as long as they make contact with both water and the engine, even if that's remotely through a grounding cable.
     
    jmcdboater likes this.

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