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    • Cummins Marine Forum Topics
    • Internal coolant leak in 1996 Cummins 5.9

      This topic has 7 replies, has 5 voices, and was last updated byGene Fuller 3 years ago

      August 13, 2020 at 3:53 am I have a 1996 6BTA Cummins engine. I am loosing antifreeze when running. there are no visible external leaks. Initially my mechanic indicated that my heat exchanger was leaking. He claimed that he saw antifreeze and sea water coming out of the zinc location on the HE after removing the bolt. I removed it and had it professionally serviced and tested. According to the shop there were no leaks. My mechanic is still insisting that it is l…

      Started by: gskill in: Cummins Marine Engines

      7 Replies
      August 16, 2020 at 9:21 am gskill wrote: Can someone please give me an opinion on the mechanicā€™s analysis. He claims he saw coolant leaking from the heat exchanger zinc while the engine was running and zinc removed. Either something got lost in the telling of the tale, or that was a very messy observation. Raw cooling water would have been spraying out of the zinc opening at a good rate. Coolant loss, at say 1 gallon per hour, would be dwarfed by seawater flow at seve…

      Last Post by: Gene Fuller posted: 3 years ago

    • Hello again

      This topic has 2 replies, has 2 voices, and was last updated byDavid Marchand 4 years ago

      February 12, 2020 at 8:39 am I have been away from this forum for a while, but since I am now helping a friend get his new to him Cummins powered trawler in shape for a 900 mile trip back home, I thought I would reintroduce myself and follow the forum more closely. The boat and engines I am working with is a 42′ Jefferson aft cabin powered by twin Cummins 6BT 210 hp engines. The boat is a 1987 model. He just purchased it and the surveyor noted a few problems/deferred …

      Started by: David Marchand in: Cummins Marine Engines

      2 Replies
      February 12, 2020 at 9:30 am Could be it. The boat did sit idle for some time before George bought it. Will grease the rudder bearings up and see how that works. Maybe also heat the shaft a little, not enough to affect the packing and see if that doesn’t also redistribute the grease. David

      Last Post by: David Marchand posted: 4 years ago

    • Sherwood M71 on 6BT

      This topic has 2 replies, has 2 voices, and was last updated byJohn Hobby 4 years ago

      October 19, 2019 at 1:28 pm Hey guys, Again, new to this boat and the 6BT 5.9M. Great motor! 440 hours. Preparing for spring. Just winterized yesterday. Check out the pic attached. Just want to hear it before I go there. Want to replace impeller. #1 Disconnect upper and lower hose. #2 Do I un-bolt entire unit from gear train and then remove the neck transition piece to replace impeller? No typical cover plate. #3 Then lash the gears back when replacing, all done?…

      Started by: John Hobby in: Cummins Marine Engines

      2 Replies
      October 19, 2019 at 2:01 pm Hey Bill, kinda felt the same. Jus wanted to get a handle on it. Only one engine, thank god, two would kill me!

      Last Post by: John Hobby posted: 4 years ago

    • Info on this aftercooler

      This topic has 2 replies, has 2 voices, and was last updated byBfuller 4 years ago

      August 11, 2019 at 12:24 pm Can anyone supply information on these aftercoolers? Mounted to 5.9 6BTA model year 1992. Looking the cooler over I see no access ports for the core. I pulled the charge air outlet (on top) and can view the core. The cases are welded together. Thanks in advance.

      Started by: Bfuller in: Cummins Marine Engines

      2 Replies
      August 12, 2019 at 12:08 am Thanks. That’s about what I guessed. Time to upgrade.

      Last Post by: Bfuller posted: 4 years ago

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