Helmsman
Guru
- Joined
- Oct 3, 2020
- Messages
- 1,127
- 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.
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.
Zinc Locations Cummins Marine Diesel Engines
Zinc Locations Cummins Marine Diesel Engines
www.sbmar.com
Attachments
Last edited: