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    • Cummins Marine Forum Topics
    • Aftercooler core

      This topic has 2 replies, has 2 voices, and was last updated byChris 2 years ago

      April 30, 2022 at 9:17 am Hello,Ā  This winter I brought my aftercooler core to get acid washed for cleaning, and this is what I just got back. See attached picture. The shop is trying to tell me that the fins are aluminum hence why tthey evaporated. See attached picture. I soaked it in some vinegar and brought it back to show they are copper. Can anyone confirm that they are in fact 100% copper. The shop told me they soaked it in caustic soda which from what I see online…

      Started by: Chris in: Cummins Marine Engines

      2 Replies
      April 30, 2022 at 10:42 am Thanks for the reply Tony. The core had calcium build up on the water side, and the fins were dirty from sucking in the blowby gasses. I (wrongly) assumed that an acid wash was common practice based on my years of experience sailing deepsea. The housing is serviceable I think, but am having a machine shop take a few thousandths off the mating surfaces to ensure good sealing. I have a cpl 1975 6bta, in a downeast boat, cruise at around 17kts at 2…

      Last Post by: Chris posted: 2 years ago

    • 6bta-330 Low voltage

      This topic has 3 replies, has 3 voices, and was last updated byChris 4 years ago

      May 20, 2019 at 1:18 pm Hello, I have been chasing an intermittent low voltage issue on my 6bta – 330 in a 31 JC. The boat has 2 Group 8D batteries that can be paralleled through a combiner switch. Cable size is I believe 2/0, battery to combiner is about 4ft, combiner/battery Neg to engine about 6ft. When taken off shore power, both batteries are around 12.8v. However, on the engine panels the low voltage alarm is going off, and showing about 8v on the gauge, an…

      Started by: Chris in: Cummins Marine Engines

      3 Replies
      May 22, 2019 at 4:34 am Gents, Thanks for the replies. I guess I misspoke regarding the combiner, its just a 1-2-Both battery switch, not a load activated combiner, so the troubleshooting of that is much easier. The 12v distribution system is pretty basic, Im leaning towards the grid heater circuit. Im putting in new batteries this week and will work towards isolating the grid heater and installing the pan heater I got from Tony.

      Last Post by: Chris posted: 4 years ago

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