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Old 11-14-2019, 03:33 PM   #1
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Zinc Pencil

What is a zinc pencil and what size is needed for a Lehman 90 hp?
I see information on the need to replace frequently.
I am sure the po did not replace.
Thanks
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Old 11-14-2019, 04:01 PM   #2
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Greetings,


https://www.westmarine.com/buy/marty...6?recordNum=21


I don't know about the 90HP Lehmans but typically the heat exchanger will have one and possible the oil and transmission coolers They are hex head nuts that thread into larger hex head nuts usually on the bottom of the exchanger. Put a wrench on BOTH to unscrew. IF you only put a wrench on the smaller nut (anode holder) and twist, you may twist the housing (larger nut) off the body of the exchanger. Do NOT twist the larger nut. Brace it with a wrench and twist the smaller nut.
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Old 11-14-2019, 04:18 PM   #3
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Judy
I'm going to guess with a home port of Toronto you are likely in fresh water.
Pencil Anodes or "Zincs" are available in different materials for different raw waters.
I'm in fresh water and use all Alum anodes - Magnesium or Alum recommended for fresh water and Zinc is only good in salt water.
I've had very good luck with Performance Metals pencil anodes and they are available in a wide variety of sizes. They have a steel core to the anode portion that helps prevent break-off of worn pencils

Performance Metals
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Old 11-14-2019, 04:25 PM   #4
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Greetings,
Mr. B. Excellent advice about the fresh water anodes. Completely slipped my feeble mind...


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Old 11-14-2019, 05:04 PM   #5
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Did you try Brian at American Diesel? 804-435-3107.
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Old 11-14-2019, 05:07 PM   #6
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American Diesel sells them. The zinc they currently supply needs to be cut down so it protrudes 1 1/2" below brass. (Middle object) Otherwise it will hit the internal tubes. Note some heat exchangers may have 2 zincs. Oil coolers may also have zincs as previously mentioned.
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Old 11-14-2019, 10:06 PM   #7
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The Lehman oil and transmission coolers do not use zinc. The coolers are considered maintenance items and has a xxxx hour replacement schedule. I'm not on the boat so don't have the replacement schedule for copper and CuNi coolers.

The Lehman heat exchanger has a zinc. It can be purchased at any marine store. The zinc is a standard size that on some coolers require cutting short as above post references. The SeaKamp uses standard length zinc and the CuNi seem to have a longer life than some of the others.

The Lehman heat exchanger also has a replacement schedule.
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Old 11-15-2019, 12:06 AM   #8
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According to American Diesel, transmission and oil coolers are on a 1200 hour replacement schedule and the heat exchanger 2,000 hours.

Those are probably for copper.

I'm guessing 1800 hours for a CuNi oil/transmission cooler and 3,000 hours for a CuNi heat exchanger.
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Old 11-15-2019, 08:28 AM   #9
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Zinc Pencil

Thanks to everyone for their input.
Will search out and look for proper size alum or mag for fresh water.
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