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    • Cummins Marine Forum Topics
    • Cummins 5.9 QSB 425 fuel pump

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

      March 31, 2023 at 3:24 pm A local cummins shop recommends getting rid of the fuel pump on the Qsb 5.9 and going with a 100 or 150gpm lift pump instead. Ā  His opinion is the original fuel pumps on the engine is prone to failure.Ā  Ā  Any thoughts ?

      Started by: worldcatlemon in: Cummins Marine Engines

      2 Replies
      April 2, 2023 at 2:17 pm The engine is a 2005 with 143 hours. I stripped the engine down to the block to service everything and repaint it. So I have the ecm and fuel pump already removed….and you’re right it was a pain.   Are there fuel pumps more suitable for the marine application instead of an automotive style ? Or would it be better while it is apart to replace with a newer style OEM fuel pump ?

      Last Post by: worldcatlemon posted: 1 year ago

    • Cummins 5.9 QSB 425 torque specs

      This topic has 6 replies, has 3 voices, and was last updated byworldcatlemon 1 year ago

      February 11, 2023 at 7:01 pm QSB 5.9 425 ho   Can anyone point me to where I can find all the torque specs for this engine ?   I need to put all the accessories back on this block after removing, cleaning, sandblasting and painting. My local cummins dealer recently moved out of the area.

      Started by: worldcatlemon in: Cummins Marine Engines

      6 Replies
      February 15, 2023 at 3:39 pm Thanks. Gives me a good place to start.

      Last Post by: worldcatlemon posted: 1 year ago

    • Barry engine mounts

      This topic has 1 reply, has 2 voices, and was last updated byRob Schepis 1 year ago

      June 13, 2022 at 9:28 pm What is the difference between the Barry engine mount #4931364 vs the #3349230 ? Ā  I have the 425 QSB engines and 2 sets of both mounts and want to know which is best for my application.Ā 

      Started by: worldcatlemon in: Cummins Marine Engines

      1 Reply
      June 14, 2022 at 4:02 am This came up once before:Ā  https://www.sbmar.com/community/topic/4931364-isolators-qsb-5-9/

      Last Post by: Rob Schepis posted: 1 year ago

    • Aftercooler pressure tester 1 2

      This topic has 24 replies, has 11 voices, and was last updated byMatt Lyman 2 years ago

      November 9, 2019 at 12:39 pm So after cleaning the aftercooler core I wanted to pressure test it for leaks before assembling the aftercooler. I saw a picture of the way Seaboard tests them but I wanted something I could hook up quickly since I have 2 aftercoolers to test. I thought I would share my cheap and easy design . ABS 4″ pipe with a 5″x4″ reducer, end caps, with one end tapped with a female air fitting and valve so I can regulate the air pressure.…

      Started by: worldcatlemon in: Cummins Marine Engines

      24 Replies
      February 21, 2022 at 12:16 pm I tested to 25 PSI with air, per a lot of recommendations on this site.Ā 

      Last Post by: Matt Lyman posted: 2 years ago

    • Smartcraft to new seaboard instruments

      This topic has 13 replies, has 6 voices, and was last updated bypmerklinger59 2 years ago

      December 30, 2019 at 2:48 pm I have QSB’s 2005 and want to do away with the old smartcraft screens, and upgrade to the SMX panels on this site. I also have the mechanical gauges that are smartcraft. My question is, do I use the original wiring harness/loom on the engine or does the engine wiring also get changed when I upgrade the control panel, and do I eliminate all the mechanical gauges?

      Started by: worldcatlemon in: Cummins Marine Engines

      13 Replies
      July 22, 2021 at 8:51 am Just wondering what happens to the digital throttle , does the SMX option one deal with that too. Thanks, Peter

      Last Post by: pmerklinger59 posted: 2 years ago

    • Seawater pump

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 4 years ago

      December 20, 2019 at 9:43 pm Is the SMX 1730 Seawater pump .the same as the Seamax 1730 ?

      Started by: worldcatlemon in: Cummins Marine Engines

      1 Reply
      December 21, 2019 at 10:04 am SMX is our LOGO. ā€œSEAMAXā€ belongs to another company and has been used at times, or by others to describe our pump or copies of the pump we developed in conjunction with Seafirst in S. Korea. My ideas, their grunt work…. We have about 5000 units in the field now and they still make them (Casting, shaft, cam, back plate, etc etc) today for us. Their main business these days is outboard Steering systems. Teleflex is the market they go after.…

      Last Post by: Tony Athens posted: 4 years ago

    • Oil filter tubes

      This topic has 6 replies, has 4 voices, and was last updated byworldcatlemon 4 years ago

      December 11, 2019 at 11:06 pm QSB 5.9 oil filter tubes. It feels to me like the oil tubes are solid with a sleeve to protect from chafing. Can I remove the sleeves without replacing the tubes??

      Started by: worldcatlemon in: Cummins Marine Engines

      6 Replies
      December 16, 2019 at 8:49 pm The orange hoses are soft and squishy until I squeeze it hard then I can feel a hard line inside.

      Last Post by: worldcatlemon posted: 4 years ago

    • Qsb 5.9 oilpan sump

      This topic has 7 replies, has 3 voices, and was last updated byTony Athens 4 years ago

      December 7, 2019 at 10:39 pm If a guy is running bow up most of the time, should the pan sump and pickup tube be moved from the front of the engine to the rear to reduce the risk of oil pump starvation ? And should the gas recirculation tube be moved to the front of the engine to reduce the risk of oil getting sucked into the turbo ? Just thinking out loud…

      Started by: worldcatlemon in: Cummins Marine Engines

      7 Replies
      December 9, 2019 at 7:41 am A “Kit” no……Parts yes.. Tony

      Last Post by: Tony Athens posted: 4 years ago

    • Qsb seawater pump

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

      November 8, 2019 at 6:53 pm My seawater pump is original and was told it is a 2701 series, it has a splined shaft and someone said the rebuild kit I needed was a 25125-SHW. So I ordered a kit and the kit is missing some parts. The tech sheet in the rebuild kit says I needed the 25126-SHW. Can anyone clarify this for me ? Any help is appreciated.

      Started by: worldcatlemon in: Cummins Marine Engines

      4 Replies
      November 9, 2019 at 12:57 pm Go here for Sherwood stuff. http://www.depcopump.com/ Tony

      Last Post by: Tony Athens posted: 4 years ago

    • Nothin like clean seawater components

      This topic has 10 replies, has 6 voices, and was last updated byRob Schepis 4 years ago

      November 1, 2019 at 6:57 pm Pulled entire seawater side of the system and soaked the parts in barnacle buster and what a difference!!! Can’t wait to start assembly, prime and paint then install. I’m just really glad I took this stuff apart. Does anyone know the paint color or code for the Cummins white ?

      Started by: worldcatlemon in: Cummins Marine Engines

      10 Replies
      November 5, 2019 at 5:14 am worldcatlemon wrote: Rob, I removed the aftercooler core from the housing, soaked it in boiling water with Simple Green to remove any oil, then rinsed it, blew it dry with compressed air then soaked it in Barnacle buster to remove the calcium deposits. Clean as a whistle I do caution against soaking the entire core in any acid based solution, the air side is much more delicate and, as we know, the acid does no good there, it is for descaling of …

      Last Post by: Rob Schepis posted: 4 years ago

    • Aftercooler corrosion on 5.9 qsb

      This topic has 9 replies, has 4 voices, and was last updated byFireisland1 4 years ago

      October 20, 2019 at 8:39 pm How much corrosion/pitting on the sealing surface between the core and the housing is ok to just grease up and reassemble? And would it be beneficial to have the surface machined smooth then reassemble? Thanks

      Started by: worldcatlemon in: General Discussion

      9 Replies
      November 1, 2019 at 7:46 pm Assemble as per SBM and pressure test. You may not have any issue

      Last Post by: Fireisland1 posted: 4 years ago

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Viewing 16 topics - 1 through 16 (of 16 total)