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    • Cummins Marine Forum Topics
    • QSB 5.9 425 Engine Mounts

      This topic has 2 replies, has 3 voices, and was last updated byTony Athens 7 months ago

      October 6, 2023 at 11:13 am Hello.Ā  I believe I have some mounts that are in need of replacement and just wanted to confirm the proper replacements.Ā  Based on the Seaboard Store it appears the mount I would use for my QSB 5.9’s are the 4931364 / 5301975.Ā  My motor physically has the 3349230, pictured.Ā  It looks like the SMX purple is a alternate replacement for the 3349230. Are the SMX purple or 3349230’s the way to go ?Ā  Should the motors have had the 4931364 …

      Started by: Robert Greig in: Cummins Marine Engines

      2 Replies
      October 7, 2023 at 7:44 am Based on the pictures, use our SMX Purple 70’s—————-Totally “Plug & Play”

      Last Post by: Tony Athens posted: 7 months ago

    • QSB 5.9 Belt Tensioner

      This topic has 2 replies, has 2 voices, and was last updated byRobert Greig 1 year ago

      November 5, 2022 at 6:52 pm I had the plastic pulley on the belt tensioner part ways after the bearing failed.Ā  I have since replaced the tensioner assembly but was wondering if the pulley can be obtained separately to have as a spare ?Ā  Thank you.

      Started by: Robert Greig in: Cummins Marine Engines

      2 Replies
      November 7, 2022 at 12:13 pm Thanks Tony.Ā  Can the metal pulley / bearing be purchased separately or do you have to purchase the tensioner as an assembly ?

      Last Post by: Robert Greig posted: 1 year ago

    • Correct performance curve and pyro gauge

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

      September 8, 2019 at 6:45 pm I wanted to confirm that I have the correct Performance Curve for my twin QSB 5.9’s, 425HP. Data Plate pictures attached. I believe the correct curve is M-93262. Also, is there any advantage to installing pyro gauges on these electronic motors ? I am still dialing in the props based on rpm/fuel flow. I wasn’t sure if the pyro gauges would assist in any way to monitor the performance or health of the motors. If so, what would the opt…

      Started by: Robert Greig in: Cummins Marine Engines

      3 Replies
      September 11, 2019 at 5:59 am Tony forgive my ignorance. I just looked up the the published warranty for both HO and non-HO ratings and they are both 24months but HO is 1000 hours and INT is 3000 hours. Does the QSB425INT engine cost more than the QSB425HO rated engine? If they have the same HP and fuel burn numbers but different warranty periods, I am guessing the extra liability for Cummins is offset by a higher initial cost?

      Last Post by: Steve Lewis posted: 4 years ago

    • QSB 5.9 425 MISFIRE

      This topic has 9 replies, has 3 voices, and was last updated byRobert Greig 5 years ago

      December 21, 2018 at 10:17 pm I have a question about a slight misfire/rough running 2012 QSB 5.9 425 HP, 1300 Hours. Data Plate info attached. I have noticed that the fuel flow and boost was slightly higher on the PORT motor during cruise. After reading through the forums, it seemed as though it was negligible but listening and smelling over the transom you could hear a slight miss and smell stronger diesel exhaust odor on that side. No noticeable smoke. After hauling, …

      Started by: Robert Greig in: Cummins Marine Engines

      9 Replies
      January 6, 2019 at 6:40 am Thanks Tony ! I’m here to listen. This forum is great and you and your team are a wealth of knowledge. Appreciate the feedback on the props and totally understand I’m working two issues unrelated to each other. I’ll provide feedback when I get a tech with a computer to check out the injectors to diagnose the mis. Thanks again………….Rob

      Last Post by: Robert Greig posted: 5 years ago

    • QSB Aftercooler Corrosion

      This topic has 4 replies, has 3 voices, and was last updated byRobert Greig 6 years ago

      February 6, 2018 at 8:43 pm New to the Seaboard forums. Lots of info I have read so far. Great help ! I have read a couple of forums about aftercooler bore corrosion but did not see any pictures matching what I have. Basic info. 2012 Cummins QSB 5.9 425 HP, 1200 Hours. Saltwater run. Squid screens, no strainers. No freshwater flush system…..yet. The boat is new to me. Ran it a partial season so far, less 100 Hours. Had one gear oil cooler fail, replaced with …

      Started by: Robert Greig in: Cummins Marine Engines

      4 Replies
      February 7, 2018 at 6:47 pm Thanks Tony, I’ll be ordering the aftercooler/heat exchanger kits shortly.

      Last Post by: Robert Greig posted: 6 years ago

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Viewing 5 topics - 1 through 5 (of 5 total)