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Pencil Zincs

Discussion in 'Ocean Yacht' started by Boomer, May 21, 2019.

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  1. Boomer

    Boomer Senior Member

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    Oct 14, 2017
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    Location:
    Seminole
    Detroit 671 TI motors...found 2 pencil zincs at the raw water intake cooler...where are the locations of the rest? Ideas?
  2. chesapeake46

    chesapeake46 Senior Member

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    I have 1 on the transmission oil cooler, one on the fuel cooler, one just after the raw water pump and one on the main heat exchanger. 1980 - 671.
  3. Boomer

    Boomer Senior Member

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    Thanks...where on the heat exchanger? Side at the intake or outflow? Do you have to drain the coolent to change out? My motors are 1983 so probably the same
  4. chesapeake46

    chesapeake46 Senior Member

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    It's on the raw water side not the coolant side.
    I hold a bucket under the plug and remove it, get a gallon or so of water.
    Mine has 2 plugs but I've only ever had 1 zinc from new.
    It has never been depleted when changing it out.
    In fact, they look so good I am tempted to leave it in a while but I never do.
  5. Boomer

    Boomer Senior Member

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    Found the one on the heat exchanger...on the front about 2 inches from the wall...fuel system still looking
  6. chesapeake46

    chesapeake46 Senior Member

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    Mine are inboard of the top of the engine. They are ahead of the secondary filter and aft of the stop solenoid. Follow the fuel line from the secondary filter.
  7. Pamela005

    Pamela005 New Member

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    May 1, 2018
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    Location:
    Annapolis, MD
    What are the sizes of these zincs? I will be at the store tomorrow and can get them for the 671's in my boat.
  8. Boomer

    Boomer Senior Member

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    Mine has 3 different sizes

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