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Old 05-19-2015, 06:48 PM   #21
City: Lewisham Tasmania
Country: Australia
Join Date: May 2015
Posts: 3
zinc pencils

First of all I apologise for the late post as I am a shift worker 7 days straight. and secondly thank you so much for all the wonderful information and Bobs generous offer.
I have been in touch with Bomac marine in the states and they can ship these pencils for me and have quoted around $12.00 US dollars each plus postage does that seem about right?
it seems I need one for the raw water line between the oil cooler and the heat exchanger and also one for the transmition cooler. im not sure if there is one in the heat exchanger as its not visible from the top. any ideas, and once again thanks to the wonderful trawler family.
By the way I have a 1985 mark 3 chung hwa 34 clipper aft cabin. only purchaed her in january this year, very happy so far, i will post a pick soon. Jersey


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Old 05-19-2015, 06:55 PM   #22
Scraping Paint
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Join Date: Oct 2007
Posts: 13,748
Our two FL120s have only one zinc apiece. It is installed in the main heat exchanger. The small oil and transmission fluid coolers (they are identical units) have no zincs.

There are, or were, manufactures of these smaller coolers that incorporated a zinc anode and also had a tab for the attachment of a bonding wire. We buy our small coolers form American Diesel; we get the cupro-nickel coolers and they do not incorporate a zinc or a have a bonding tab.

We connect our small coolers to the boat's bonding system via the engine they're mounted on simply by removing the paint on the body of the cooler where the metal mounting clamp fits around it and making sure the metal of the clamp is clean to make a good electrical connection to the cooler body.

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Old 05-19-2015, 07:10 PM   #23
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City: Sitka
Country: USA
Vessel Name: Rob n' Lee
Vessel Model: Kadey Krogen 42' #192
Join Date: Feb 2015
Posts: 101
I am about to get a new transmission cooler from American diesel and will get the CN model. I must not have that one as mine (original) does have a zinc. I'll follow your bonding rec's for it. Thanks

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