Helmsman
Guru
- Joined
- Oct 3, 2020
- Messages
- 1,123
- Location
- Chattanooga
- Vessel Name
- Mishy Jean
- Vessel Make
- Helmsman Trawler 38E
I found these on the sbmar.com site. Pics from the site are attached. The link shows a variety of Cummins engine zincs, with the QSB 6.7 at the bottom. It appears to me that there are 5 zincs. Two are listed as 1/2” (thread?) on the aftercooler. One is 3/8” thread on the gear oil and two 3/8” thread on the heat exchanger. They are marked on the pictures. Other sites say there are three 1/2”.
I read elsewhere that you need to be careful of a couple of things. Have something to catch the water below the lower aftercooler zinc so it doesn’t spill on the fuel pump. There may also be a need to shorten (saw it off) the small one in the gear oil cooler. I am not sure if the shortening is an accurate statement but could be verified before placement by comparing the new with the old. This tracks with what I saw on a newer Helmsman 43e. Cummins certainly doesn’t make this aspect of maintenance easy to determine.
www.sbmar.com
I read elsewhere that you need to be careful of a couple of things. Have something to catch the water below the lower aftercooler zinc so it doesn’t spill on the fuel pump. There may also be a need to shorten (saw it off) the small one in the gear oil cooler. I am not sure if the shortening is an accurate statement but could be verified before placement by comparing the new with the old. This tracks with what I saw on a newer Helmsman 43e. Cummins certainly doesn’t make this aspect of maintenance easy to determine.
![www.sbmar.com](/proxy.php?image=https%3A%2F%2Fwww.sbmar.com%2Fwp-content%2Fuploads%2F2015%2F10%2FCummins-B-C-series-Zincs-2.jpg&hash=be58d846fb8e7aae22cefb4c111bf2b1&return_error=1)
Zinc Locations Cummins Marine Diesel Engines
Zinc Locations Cummins Marine Diesel Engines
![www.sbmar.com](/proxy.php?image=https%3A%2F%2Fwww.sbmar.com%2Fwp-content%2Fuploads%2F2017%2F10%2Fanchor-150x150.png&hash=75dd6e10497c245763b97e1f2033d31e&return_error=1)
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