Cummins Marine Diesel Repower Specialists Forums Cummins Marine Engines

This forum contains 739 topics and 4,574 replies, and was last updated by  Mike Mason 1 hour ago.

Viewing 20 topics - 1 through 20 (of 739 total)
    • Cummins Marine Forum Topics
    • Belt/Pulley squeal help

      This topic has 3 replies, has 2 voices, and was last updated by Mike Mason 1 hour ago

      October 14, 2018 at 8:57 pm We get this squeal after the boat sits for a week or so. Any ideas? Thanks. Qsb 5.9’s 1300 hrs Attachments:You must be logged in to access attached files.

      Started by:  Mike Mason


      3 Replies
      October 15, 2018 at 11:58 am I have now. Guess that’s high on the list. Mike

      Last Post by:  Mike Mason posted: 1 hour ago

    • Zeus Pods: Good, Bad, Ugly??

      This topic has 5 replies, has 5 voices, and was last updated by Paul Greenhalgh 3 hours ago

      October 14, 2018 at 10:15 pm I am considering buying a Meridian 441 flybridge ‘motor yacht’, which is 47’ LOA and 31,000lbs. These come with various engine configurations but commonly, with QSB 425’s which can be either shaft-drive or Zeus pods. All my personal experience to date is with 6BTA 370’s in a conventional shaft drive arrangement. I am after some of Seaboard’s famous frank and honest advice: should I run away from pod drives….or go for them if …

      Started by:  Paul Greenhalgh


      5 Replies
      October 15, 2018 at 9:12 am Thanks to all….just the practical advice I was looking for. I’ll be limiting my search to non-pod models going forward.

      Last Post by:  Paul Greenhalgh posted: 3 hours ago

    • Propping the 6BTA5.9-M3

      This topic has 6 replies, has 3 voices, and was last updated by Curtis J McNamee 5 hours ago

      October 14, 2018 at 9:12 pm I need to figure out if my engines are propped correctly for the best operating conditions. I have a pair of 6BTA5.9-M3 370 hp engines in my 2002 Silverton 39MY Maybe there is already and article written on this. Any help would be greatly appreciated. Cheers, Curt Curt From the Great Pacific NW

      Started by:  Curtis J McNamee


      6 Replies
      October 15, 2018 at 8:03 am Hi Tony- First….thanks for having this site and helping us all out with questions !!! I will gather more information about my engines for you and post it on this thread. Cheers, Curt Curt From the Great Pacific NW

      Last Post by:  Curtis J McNamee posted: 5 hours ago

    • Aftercooler coolant tube leak

      This topic has 3 replies, has 2 voices, and was last updated by Tony Athens 5 hours ago

      October 12, 2018 at 6:35 am Anybody have any experience dealing with a leaking coolant tube on a 250 cummins FWAC CPL953? The small weep is at the connection to the head in what appears to be a freeze plug. I am going to call today for availability of the replacement part. Item 22 in the attached diagram. D Attachments:You must be logged in to access attached files.

      Started by:  David Wesner


      3 Replies
      October 15, 2018 at 7:48 am Same to me?? Tony Athens Seaboard Founder Go here for the latest stuff we put together and share for all to see: https://www.sbmar.com/tonys-tips/ Attachments:You must be logged in to access attached files.

      Last Post by:  Tony Athens posted: 5 hours ago

    • Minimum / recommend exhaust size for a Cummins 6BTA 250 HP engine

      This topic has 0 replies, has 1 voices, and was last updated by Michael Womack 16 hours ago

      October 14, 2018 at 8:14 pm I manage the wooden tall ship Enterprize in Melbourne Australia. The engine is a Cummins 6 BTA 250 HP, engine number 60264364. The current exhaust system has pin hole leeks developing to larger holes in the inner dry pipe, the surrounding wet jacket appears to be OK. I have a new exhaust system being finalised, however while to old system had the inner dry pipe made of 3 mm the new exhaust is made from 7 mm pipe. This has resulted in a signific…

      Started by:  Michael Womack


      0 Replies - Can you Help? ...be the First to Respond!

    • Marine Age…Age Is Just a Number

      This topic has 20 replies, has 9 voices, and was last updated by Rob Schepis 19 hours ago

      October 19, 2016 at 5:51 pm Don’t let marine age get the best of your engine room.  Here’s an example of a pair of 330B’s installed in 2002 and a genset from 2005.  That’s 15 seasons for the engines and 12 for the genny.  Dry engine rooms vents,  dry overhead environment or proper drainage of above decks, Wolverine pan heaters and periodic checks and spraying and wiping down with anti-corrosion products.  That’s some of the key ingredient…

      Started by:  Rob Schepis


      20 Replies
      October 14, 2018 at 5:11 pm Mike Pettee wrote: Rob, Your one picture has what looks to be an envirovent on the front of the crankcase. But I dont see the full kit. Does just having that vent on the front of the block help? Mike, Full EnviroVents installs on both engines, off the front crankcase as you noted. Rob "Luck is the residue of good design." Attachments:You must be logged in to access attached files.

      Last Post by:  Rob Schepis posted: 19 hours ago

    • Cummins 6bt does not shut off with key

      This topic has 1 reply, has 2 voices, and was last updated by Tony Athens 21 hours ago

      October 14, 2018 at 10:20 am I wanted to get input for the following issue with my starboard engine. I recently had the alternator rebuilt.(this might be the issue) I have an on/off key ignition with a push start button at the helm. With the engine not running and when I turn the key on the power goes to the screw in type fuel solenoid and retracts the internal plunger.I get a good reading of 12v. With the engine not running and when I turn the key off the fuel solenoid shu…

      Started by:  John Edwards


      1 Reply
      October 14, 2018 at 3:05 pm #1–What exact 6BT/6BTA do you have?.. #2–If you have an EXTERNAL FUEL solenoid (sounds like it) that you see retract, then it should not retract by just turning on the ignition without starting the engine…. Your wiring is not right. #3–is this a new issue? Tony Tony Athens Seaboard Founder Go here for the latest stuff we put together and share for all to see: https://www.sbmar.com/tonys-tips/

      Last Post by:  Tony Athens posted: 21 hours ago

    • B-series turbocharger differences

      This topic has 8 replies, has 3 voices, and was last updated by Tony Athens 22 hours ago

      September 27, 2018 at 6:48 am Greetings! I’m new to this forum, but have already had lots of help from the information available on this site. Thanks for providing sbmar.com, Tony! My 29ft boat is powered with a cpl 1570 220hp/2500rpm engine coupled to a Stern Powr 1000 outdrive. I’m having issues getting on plane and am currently working through the setup, eliminating any potential problems. The engine has been modified a little and is currently using a SWAC ins…

      Started by:  Cato Jensen


      8 Replies
      October 14, 2018 at 2:59 pm Obviously, Test C was the best for overall performance and engine loading.. If the engine is in good shape and “well gauged” and alarm protected, the cooling system is up to spec, then running with the Test C prop at 2300 to maybe 2400 RPM should be fine as long as the test weight of the boat does not change. Tony Tony Athens Seaboard Founder Go here for the latest stuff we put together and share for all to see: https://www.sbmar.co…

      Last Post by:  Tony Athens posted: 22 hours ago

    • Winterizing a Cummins 6BT/6BTA

      This topic has 2 replies, has 2 voices, and was last updated by Bill Desmarais 1 day ago

      October 13, 2018 at 7:03 am Hello all, I hauled my little lobster boat last week. Getting cold up here in NH. Marina contracts up here in the northeast end on Oct 15th for the most part. The raw water cooling circuit in the 370 needs to be winterized. How to do it? How much RV anti freeze required for the Cummins 6BT/BTA to winterize? I think I captured the information and procedure for winterizing a marine diesel in the following three videos. For what it’s wort…

      Started by:  Bill Desmarais


      2 Replies
      October 13, 2018 at 5:12 pm yup…3 gals would be plenty. The 370 in my boat has a 5″ Centek horizontal muffler…drains hauling up the ramp. 25 Terry Jason down east, 370 6BTA CPL 2008 ZF63A gear, 1.75" shaft, 20X19 DQX

      Last Post by:  Bill Desmarais posted: 1 day ago

    • 4BTA Temp Sender options

      This topic has 2 replies, has 2 voices, and was last updated by Dan 2 days ago

      October 10, 2018 at 7:20 pm I currently have an aftermarket 195 degree temp alarm sender, a VDO temp alarm 205 degree sender? and gauge sender fitted to the cylinder heads of my engines. I’ve found an aftermarket NMEA 2000 probe that can be plugged into my Simrad MFD’S and have further alarms (visual and audio) and another temp gauge on the MFD displays. Is there an alternative option to fit another temp sender probe in a 4BTA? Tony mentioned another option for…

      Started by:  Dan


      2 Replies
      October 13, 2018 at 3:09 am Thanks again Tony

      Last Post by:  Dan posted: 2 days ago

    • New owner of a 38 Bertram Convertible with 6CTA 480ce's – immediate priorities? 1 2 3 4

      This topic has 66 replies, has 6 voices, and was last updated by Nicholas Cummings 2 days ago

      October 13, 2017 at 10:07 am Just closed on a B38 powered by 2002 6CTA’s with about 1500 hours. This is my first diesel boat so I’ve spent the last month or two pouring over this site and some others to get educated. In 2016 the engines had heads rebuilt, turbos rebuilt, aftercoolers and heat exchangers serviced, and new injectors installed. One engine also had a piston, liner, rings, and bearings replaced and the other got a new belt tensioner and serpentine…

      Started by:  Nicholas Cummings


      66 Replies
      October 12, 2018 at 1:51 pm After seeing my fuel burn numbers go up through the summer to where I was well above the desired curve, I just pitched down (for a second time) another inch and had all the cup removed from my props. With the fresh prop job and a clean bottom (they power washed the bottom while the props were being changed) I’m now burning: 2200 RPM (Port/Stbd): 12.3/14.2 gph 2400 RPM (Port/Stbd: 15.2/17.1 gph (to save you from having to reference the cha…

      Last Post by:  Nicholas Cummings posted: 2 days ago

    • Code 559 low fuel pressure – accelerating 1 2

      This topic has 23 replies, has 5 voices, and was last updated by Luke Nelson 3 days ago

      September 18, 2018 at 5:01 pm Hello, Ive been trying to solve the 559 low fuel pressure alarm for some time now with no results. Right now it only activates when power is put to plane and when WOT. Boat has a pair of 5.9 QSB 355 hp 650 hrs 2007 Here a list of things done with no sucess in order: 1)Replaced racor. (Issue improved but still present) 2)Replaced engine fuel filter and vacum gauge on racor) 3)Replaced pressure sensor on fuel rail. 4)Replaced fuel transfer pump …

      Started by:  Fernando Perez


      23 Replies
      October 11, 2018 at 4:42 pm I have almost the same thing but on a pair of 24V qsc’s, I did almost the as what you have done . I found a way around it (not the right way, but it works 600 hours down) but It will good to hear is you find the right solution. It should not matter I had more issues with the engine I had the remote fuel filter kit on as it had more piping to run through?

      Last Post by:  Luke Nelson posted: 3 days ago

    • Oil Test Kit

      This topic has 1 reply, has 2 voices, and was last updated by Images 3 days ago

      October 11, 2018 at 1:38 pm Any recs on where to order an oil test kit from to test the engines and generator? Thanks! Mike

      Started by:  Mike Cohen


      1 Reply
      October 11, 2018 at 2:18 pm HO Penn 860-594-4860

      Last Post by:  Images posted: 3 days ago

    • Loss of fuel p7100

      This topic has 5 replies, has 3 voices, and was last updated by Apro.mw 4 days ago

      October 10, 2018 at 12:44 pm I have a total loss of fuel at the injectors on my p7100. No fuel when i crack the lines at the injectors. I can see the pump is turning through the inspection port on the timing cover. Any ideas on where to start with this? Boat was running fine then started to black smoke heavily out the exaust then the engine just died and wont restart. 600 hours on motors.

      Started by:  Apro.mw


      5 Replies
      October 11, 2018 at 10:06 am It ran fine all summer long until the issue

      Last Post by:  Apro.mw posted: 4 days ago

    • Gear Oil Coolers

      This topic has 4 replies, has 3 voices, and was last updated by Mike Schmidt 4 days ago

      October 9, 2018 at 11:01 am I have “stock” gear oil coolers on my 2006 330btas (saltwater boat). After reading Tony’s article recommending replacing these as a preventative measure, I’m considering it… but since they’re very expensive and there’s no indication that they’re failing, I just want to make sure this is a smart investment. What’s the consensus here on preventative replacement?

      Started by:  Mike Schmidt


      4 Replies
      October 11, 2018 at 8:32 am Tony Athens wrote: Personally, I do not share that opinion, at least operating in salt water and / or with the “in general” lower quality of the oil coolers that come on “todays” light weigh high HP/liter diesels. Seems gear oil coolers that came on the old heavy iron engines never had the issuse we see today.. They were like a part that was “out of sight, out of mind” I also believe the if one does not diligently flush with fresh …

      Last Post by:  Mike Schmidt posted: 4 days ago

    • Propping Question – QSC 540s

      This topic has 9 replies, has 6 voices, and was last updated by Mike Mason 5 days ago

      July 15, 2018 at 6:21 pm Hi there. I am hoping to get a little help assessing my current propping arrangement and the extent of further required adjustments. My boat is a 2008 41 Riviera flybridge with QSC 540 HP motors (2600 rated rpm). This is my 3rd season with the boat. I have had the props off twice to be adjusted and will do so again after the season if and as needed. I am in SoCal and have used Wilmington Propeller for prior adjustment and balancing. Props …

      Started by:  Kraig Kilger


      9 Replies
      October 9, 2018 at 8:02 pm Nobody better than Wilmington. You are right where you need to be. Adding cup would give you lift but then you need to reduce pitch. It’s give and take. Enjoy it how it is. I have been down this road chasing a ghost. Our burn rate is slightly off port vs starboard as well.

      Last Post by:  Mike Mason posted: 5 days ago

    • Motor Mount Replacement

      This topic has 1 reply, has 2 voices, and was last updated by Philip 1 week ago

      October 7, 2018 at 6:27 pm 2 rusty motor mounts from previous leaking seawater pumps on qsb 5.9’s. What is the best way to replace without disturbing alignment. Physics tells me I can remove one and nothing will move but want to make sure. Is there a better way? Block engine etc? Thanks in advance. Mike

      Started by:  Mike Mason


      1 Reply
      October 8, 2018 at 12:45 pm Every engine/boat/installation is different. Most require a jack or chain lift of some sort to remove weight from the mount and raise engine to replace mounts. I usually use blocks of wood and a small bottle jack. But I guarantee any method you use WILL REQUIRE engine alignment. You can get it close by measuring engine mount heights but it will need to be adjusted the final bit once installed.

      Last Post by:  Philip posted: 1 week ago

    • Cummins 4BT questions

      This topic has 2 replies, has 2 voices, and was last updated by Shannon Ritzert 1 week ago

      October 6, 2018 at 8:37 am Hi guys, I hope everyone is enjoying their Saturday. I have been perusing ya’lls forums for about a month now, in an attempt to answer a few questions I have. I’m not sure where to begin, so my apologies if I write to much info. My name is Shannon. I have been in the marine industry as an inboard technician since 1992. I own a small boat dealership in North East Texas. I say that because I don’t have limited knowledge on bo…

      Started by:  Shannon Ritzert


      2 Replies
      October 8, 2018 at 11:58 am Hey Tony I appreciate the reply, and help. I am trying to work through #1. I dropped my strobe in the water this year, and haven’t replaced it yet. I think I have to use it about once every five years, and was waiting for a good excuse to replace it. Most things I work on now, you just plug in to the comm port, and get your readings via diagnostic software. Regarding #2. The sender that is in that location on my engines looks identical…

      Last Post by:  Shannon Ritzert posted: 1 week ago

    • A dirty after cooler???

      This topic has 11 replies, has 3 voices, and was last updated by Tony Athens 1 week ago

      October 4, 2018 at 5:16 am Boat with the 300 hp 6btas. Going to wide open throttle port moves up to 2700 max and the starboard lags behind it and only reaches about 2600. Clean bottom, but boat not used much over the last year. What comes to mind are over propped, reduced fuel supply from dirty filters, or as the man demonstrating the boat suggests, starboard engine after cooler needs cleaning. The man is in business as a diesel mechanic and has taken care of the boat f…

      Started by:  Raymond Slingerland


      11 Replies
      October 7, 2018 at 11:47 am Don’t procrastinate? DO IT! It’s all here : Cummins Marine Aftercooler Maintenance Tony Tony Athens Seaboard Founder Go here for the latest stuff we put together and share for all to see: https://www.sbmar.com/tonys-tips/

      Last Post by:  Tony Athens posted: 1 week ago

    • QSB 6.7 Re-Rating 480 to 550

      This topic has 5 replies, has 3 voices, and was last updated by Tony Athens 1 week ago

      October 2, 2018 at 2:12 pm Hello All, I’m helping a family member in Florida with his boat, a recreational sportfisher with twin QSB 6.7 480HP@3300 (CPL 4191) with ZF 2800 series pods. New it turned 3350 at WOT. Now, with added gear, dirtier bottom, etc it is operating above the Cummins prop demand curve at cruise and only reaching ~3200 WOT. One option is to change props ($$ x 4). Is it feasible to change motor to the intermittent duty rating of 480HP@3000 RPM or HO o…

      Started by:  Joe F


      5 Replies
      October 6, 2018 at 7:12 am Steve, I think you are over thinking this, or maybe you are thinking this way ?? Yes—all of the CPL4191’s are the same engine internally so put them all on a dyno at 15 GPH @ 2600 RPM and they will all “wear out” at the same rate.. IMO, the prop curve fuel burn has nothing to do with it………..But with that said, (another IMO), in general, the higher RPM you pull that HP at (ABOUT 300HP) , the easier it is on the engine ( like on …

      Last Post by:  Tony Athens posted: 1 week ago

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