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    • Cummins Marine Forum Topics
    • RPM’s not registering on SMX-What to check for

      This topic has 3 replies, has 2 voices, and was last updated byCorey Schmidt 4 years ago

      January 13, 2020 at 7:35 am Hello All, I have a 5.9 12V 6BTA5.9 and have added the SMX digital gauge. The SMX would show RPMs when it was over 1k and anything under it didn’t really show a good reading. I just replaced the Cummins Magnetic Pickup Speed RPM Sensor and adjusted it the way I was instructed too. But now I have no RPM’s at all showing up. Any idea where I should start to trouble shoot this problem? thanks in advance for the info!!

      Started by: IslandStyle in: Cummins Marine Engines

      3 Replies
      January 17, 2020 at 10:31 pm The mag pickup is a DUAL output device… both pairs output a square wave RPM signal… one is meant for the on-engine pre-heater, the other for the TACH. Make sure the pickup is installed correctly: How To Install a Magnetic Pickup to Drive a Tachometer

      Last Post by: Corey Schmidt posted: 4 years ago

    • bad rear seal on Hurth HSW630A 1.25 to 1

      This topic has 1 reply, has 1 voices, and was last updated byIslandStyle 5 years ago

      April 30, 2019 at 11:56 am Well took the boat out and leaking fluid from rear seal. Was going to order a seal and O ring and attempt this repair myself. Talking to a few people they are suggesting to remove the transmission from the boat. Was trying not to do that and was wondering if anyone has attempted this task while in the boat and any suggestions or hints on this? thanks in advanced JD

      Started by: IslandStyle in: Marine Transmissions

      1 Reply
      May 2, 2019 at 7:38 am just an update replaced the seal last night all went well. Not too bad of a job and left the transmission in the boat. Approx 2-3 hour job for future ref.

      Last Post by: IslandStyle posted: 5 years ago

    • Newbie Alert-Cummins SMX sensor info needed!!

      This topic has 6 replies, has 4 voices, and was last updated byTony Athens 5 years ago

      April 16, 2019 at 8:24 am Guys, (this is my first diesel boat so sorry for the dumb questions)I have a Cummins 5.9 6BTA5.9 and just added the SMX digital gauges. I am trying to figure out what sensors I need and their placement on the motor. I bought the kit but just seeing if I should add anything else. 1st pic there is one sensor there and one next to it with nothing hooked up 2nd pic at the top there is 2 brass fitting coming out with nothing hooked up 3rd pic is the…

      Started by: IslandStyle in: Cummins Marine Engines

      6 Replies
      April 22, 2019 at 5:07 pm I really want to help, but you need to be way better picture wise…………Take better pictures, hold the camera steady and level, and hold it in a position so I can’t see what there in to see. I cannot see around a corner. Send them to me direct.. tony@sbmar.com .But, from the little I can “see” your engine will have to be rewired–I see at least two things that are “boat builder mods” and…

      Last Post by: Tony Athens posted: 5 years ago

    • fuel line for diesel boat

      This topic has 2 replies, has 3 voices, and was last updated byTony Athens 6 years ago

      January 18, 2018 at 12:27 pm Guys, quick question I have a new to me boat that I would like to redo the fuel line. I have source some fuel line I am being told it is good for Diesel fuel and has 250 psi rating and good up to 200 degrees. This is my first exp with a diesel boat. Can anyone let me know if this hose would work? They call it Easy Couple with built in braid? I am sourcing it from a local hydraulic supply house in town. I am using it for the vent line, fuel fill …

      Started by: IslandStyle in: General Discussion

      2 Replies
      January 19, 2018 at 5:41 am Look at the attached picture.. Don’t get complicated.. This is the “spec” you want to use…….. Very common, easy to get and cheap.. For a 6 BT 5.9, 3/8″ for supply and 1/4″ for the return is fine..–Use can use barb fittings & hose clamps or PUSH-On fitting & SAE /JIC flare fittings for un-inspected vessels Tony

      Last Post by: Tony Athens posted: 6 years ago

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