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- Cummins Marine Forum Topics
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QSB HX zincs broke off, acid flush HX?
This topic has 7 replies, has 4 voices, and was last updated by
3 years ago February 5, 2021 at 1:12 pm Twin QSBs. Freshwater flush installed and used religiously (installed Spring 2020, after the sbmar seawater protocol which I did Summer 2019) I was changing out pencil zincs and both the HX zincs broke off, and thereās some clogging of the HX tubes at the bottom, with the built up zinc material. Canāt get to the tubes with a rod, should I just do an acid flush of the seawater circuit to clean that up? Or leave it be? Temps have been rock s…
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in: Cummins Marine Engines
7 RepliesFebruary 8, 2021 at 8:17 pm Sounds good.Last Post by:
posted: 3 years ago
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QSB After Cooler O-Rings
This topic has 2 replies, has 2 voices, and was last updated by
3 years ago February 5, 2021 at 12:43 am I am about to service my QSB 5.9 380 after cooler. Trouble is I am confused about whether to use the thick or thin O rings. From the pictures in your article āB Series After cooler O-Ring Identificationā I should use the thin ones, but the Cummins spare parts website shows thick rings for my engine serial number. My boat was built in 2008, engine serial number 46824262. Any Ideas?
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in: Cummins Marine Engines
2 RepliesFebruary 5, 2021 at 7:14 pm Thanks Tony, you are right as always and the spare parts web site is wrong. I have now pulled my after cooler apart and my O rings are definitely the thin ones. The story is that I serviced my after cooler about 18 months ago but I noticed I was getting a bit of grease bleeding out under the end caps, I also noticed a tiny bit of corrosion which is visible in the photo just under the water outlet. It occurred to me that the turbo air pressure ma…Last Post by:
posted: 3 years ago
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Seawater pump belt removal on qsb5.9
This topic has 3 replies, has 4 voices, and was last updated by
3 years ago May 26, 2018 at 10:51 am I have twin qsb5.9 440s on my boat. The engines have the newer seawater pump belt configuration but my manual only shows the older belt setup with an idler pulley. How do I remove and reinstall the belt if I canāt lessen it? Do I just get it off a little and then advance the engine to walk it off the pulley? Where do I put my wrench to advance the engine?
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in: Cummins Marine Engines
3 RepliesNovember 17, 2020 at 12:19 am Isn’t the engine being rotated backwards in that video?Last Post by:
posted: 3 years ago
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Mercury smartcraft replacement
This topic has 16 replies, has 6 voices, and was last updated by
3 years ago May 14, 2019 at 7:28 pm I am interested in replacing my Mercury marine smart craft computer. I have a 2009 Meridian with twin 5.9 cummins diesels. I have been told that because I also have a DTS throttle control system that I cannot replace the smart craft with an after market system. Is that true? What are my options? Thanks, Jon Arnold
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in: Instrumentation & Electronics
16 RepliesOctober 14, 2020 at 11:30 am ynoty3k wrote: Those are just the displays, correct? What about swapping to straight j1939 controls and removing the full smartcraft system? The system referenced above will replace everything SmartCraft on your boat physically including the harnessing and start/stop key(s), etc.Last Post by:
posted: 3 years ago
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replacing smartCrap
This topic has 7 replies, has 3 voices, and was last updated by
3 years ago August 5, 2020 at 5:45 am Has anyone replaced SmartCrap ? What are the options ? ( i have twin qsb 5.9 380s) I really like my analog gauges, one option is 2 smx screens per engine. from what i can tell that would require replacing wire harness as well Not sure how i feel about having 4 screens. Anyone who has done this How do you like it?
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in: Cummins Marine Engines
7 RepliesAugust 10, 2020 at 5:01 pm Thanks Corey, I didn’t realise that, in which case the upgrade kit is definitely the way to go.Last Post by:
posted: 3 years ago
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Valve Clearances
This topic has 3 replies, has 3 voices, and was last updated by
3 years ago June 19, 2020 at 2:09 am I have a QSB380 12 years old with 1140 hours. The valve clearances have never been checked. So I guess it is time? QSOL says to use a special barring tool, which I do not have. Any alternatives? Do I need to loosen the injectors to turn the engine over? Any other tips? I did have a look in Tony Tips but couldn’t find anything specific
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in: Cummins Marine Engines
3 RepliesJune 19, 2020 at 3:48 pm Thanks guys, I had it in my head that the service interval was 1000 hrs, but now I have re checked QSOL it is actually 5000. Everything sounds fine, so I think I will leave it for while. For info I tried the socket on the alternator pulley method but it didn’t work, the belt just slipped. Thats why I asked about the injectors. I totally agree though, messing with the injectors is beyond my pay grade. Maybe I need new belts after 12 years?Last Post by:
posted: 3 years ago
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Raw Water Impeller replacement
This topic has 2 replies, has 2 voices, and was last updated by
3 years ago June 9, 2020 at 1:11 am I have a Sherwood raw water pump with an SMX impeller in my QSB380. I do about 100 hours a year. How often should I replace the impeller? Could I safely go 2 years/200 hours between replacements?
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in: Cummins Marine Engines
2 RepliesJune 9, 2020 at 2:23 pm Thanks Tony, I love simple answers!Last Post by:
posted: 3 years ago
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Star Board motor not reving. 330 QSP
This topic has 2 replies, has 3 voices, and was last updated by
4 years ago March 26, 2020 at 1:14 pm Hi all. And thanks u for letting me join. Had a prob with the SB engine (330 QSP) in a Meridisn 391. Pulled up for fuel. ( we are bring the boat home 360 miles.). Started it up. Went for cruise revs appox 2200 and the SB engine only went to 1500 revs. No smoke. Just stopped there. We reset the engine circuit breakers a couple of times and all works good. Next fuel stop the same thing happened but resetting does not do anything. We went back…
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in: Cummins Marine Engines
2 RepliesMarch 29, 2020 at 12:24 am I had a similar problem with my QSB380, with Glendinnig throttle control. It would run fine but not go beyond 1500 or 1600 RPM. The problem was intermittent, some times it would run fine and then on the next start the problem would return. It took me ages to track down, I got the trouble shooting manual, checked all the alarm codes, could not find anything. Turned out to be the Electronic throttle control processor, the white computer mounted in…Last Post by:
posted: 4 years ago
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Fresh Water Flush Pictures, Make your boat Famous!
This topic has 8 replies, has 9 voices, and was last updated by
4 years ago December 4, 2019 at 12:19 pm Hello there, Corey and I are working on a new video and web article for fresh water flushing. We could use some good pics and/or video clips of fresh water flush setups. We know all you smart people out there have come up with a myriad of brilliant solutions. We would love to showcase a few of your unique ideas on our site and youtube channel. Please email high res pics to Justin@sbmar.com Short video clips would be good too, but we can only…
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in: General Discussion
8 RepliesDecember 21, 2019 at 3:36 pm Spring of 2019 I launched after being out of the water with a repowering job on my 38 ft CC Commander. Detroit 8.2L Turbo’s were removed in exchange for Cummins 6 BTA Diamond 370’s. Tony and the crew helped design and fabricate the exhaust from their shop in California for me here in South Florida. All handled via email and a few phone calls. I don’t think Tony ever sleeps because we typically spoke at night Eastern time.…Last Post by:
posted: 4 years ago
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Changing exhaust hoses
This topic has 8 replies, has 5 voices, and was last updated by
4 years ago November 27, 2019 at 3:01 pm Well, I finally managed to change my 3″ dia exhaust outlet hose, but damn that was NOT easy!! It was like they were glued on to the muffler outlet… there was a point where I thought it’d be impossible to get off. After twisting and pulling centimeter by centimeter the finally did come off. My next project was going to be replacing the big 10″ hoses, but now I’m seriously spooked. Any tips or words of encourageme…
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in: Cummins Marine Engines
8 RepliesDecember 8, 2019 at 9:29 am Yes, Must be very careful as you get closer to pipe. But this is true if you use a knife or hack-saw. Also, once you cut through the wire reinforcement, the hose tends to “pop apart” and separate from the pipe. It makes it much easier to remove when it does that. Or as you get close to a complete cut-through, use a screw- driver blade to do the final separation. But must be really careful when Dremel, but a must for me when th…Last Post by:
posted: 4 years ago
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engine hours imbalance Cumins QSB 5,9.
This topic has 3 replies, has 4 voices, and was last updated by
4 years ago September 5, 2019 at 1:13 pm Hello everyone, I’m french. I have a boat with 2 engines Cumins QSB5.9. For 10 hours, one of the vessel didnāt work. but all engines was working very well. Do you know if it is possible to add 10 hours to the vessel view Smart Craft by computer ? (to balance the engine hours). Thank you so much. I can not find an answer in France …
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in: Cummins Marine Engines
3 RepliesSeptember 9, 2019 at 3:46 am Engine hours are memorised by the ECM. So unless the ECM has been changed the total engine hours displayed on Vessel view will be correct. For example, if you replace a vessel view display with a new display (as I did with an SMX display) the correct hours will be displayed.Last Post by:
posted: 4 years ago
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Engine Oil Flush
This topic has 1 reply, has 2 voices, and was last updated by
4 years ago August 12, 2019 at 1:14 am I am about to change the oil on my QSB 380. Do you recommend adding an oil flush product prior to draining the old oil? I have never used these type of products before, do you think they are worthwhile?
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in: Cummins Marine Engines
1 ReplyAugust 12, 2019 at 8:18 am I would add absolutely nothing but the engine oil that is spec’d by Cummins.Last Post by:
posted: 4 years ago
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Benefits of freshwater flush!!
This topic has 7 replies, has 7 voices, and was last updated by
4 years ago July 20, 2019 at 8:41 am Zincs after 7 months. We freshwater flush after every use.
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in: Cummins Marine Engines
7 RepliesJuly 30, 2019 at 5:46 pm Change it on condition. The bottom one is corroding because it stays immersed, or at least wet, the top is drying out after shutdown.Last Post by:
posted: 4 years ago
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After cooler hoses
This topic has 5 replies, has 3 voices, and was last updated by
4 years ago July 17, 2019 at 5:06 pm Hi all, I am about to overhaul my after cooler. Is it best to replace the hoses as a precaution or is it OK to re use the existing hoses if they are still in good condition?
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in: Cummins Marine Engines
5 RepliesJuly 22, 2019 at 1:09 pm Yes, my initial reply could have been a bit more informative in that regard, thanks Mike.Last Post by:
posted: 4 years ago
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QSB 5.9 380 with 5000+ hours.
This topic has 8 replies, has 6 voices, and was last updated by
4 years ago March 9, 2019 at 12:41 pm Hi Captains I am looking at a boat with twin QSB 5.9, 380hp boat with 5100 hours on them. Boat is 2005 and records show that 90% is trolling speed. I think they overhauled the turbos once. If the boat performs good reaching its rpm specification with no smoke and good reading on all gauges should I worry about the hours? I am planing to get the engine survey if everything goes right, but I figure to get some opinions here. thanks.
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in: Cummins Marine Engines
8 RepliesJune 5, 2019 at 5:02 am Hiroki Toma wrote: During negotiation, owner changed his mind about selling the boat. oh well. Well that’s when you know without any doubt that it was a very good boat!Last Post by:
posted: 4 years ago
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Change idle rpm on QSB?
This topic has 19 replies, has 8 voices, and was last updated by
4 years ago
May 15, 2019 at 1:22 pm I have a QSB 5.9, idle is set to the standard 600. Can it be set up using the Cummins Insight software (or some other means)? I do not have the C-Cruise option. The alternator cannot keep up with the draw at that speed and I get low voltage warnings. At about 675 it is break even and no problems, so I’d like to get it set to 675. I’ve called two Cummins service reps and they don’t seem to know how.
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in: Cummins Marine Engines
19 RepliesMay 28, 2019 at 12:54 pm If you can fit a smaller pulley without over speeding the alternators, that’s probably the easiest/cheapest route. I’ve run out of time to chase this but I think my ultimate solution involves a hair pin stator alternator, either Balmar’s or someone else’s. The Delco 24 and 28 are similar to the hair pin style.Last Post by:
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Adjusting valve lash 5.9QSB 230 HP
This topic has 2 replies, has 3 voices, and was last updated by
4 years ago May 13, 2019 at 7:21 pm I plan to adjust the valve lash on my 2012 5.9 QSB with 700 hours. I can hear valve clicking and it āthrobsā at idle. Questions. Is the a TDC marking on the engine, and does a Cummins barring tool work to turn the motor over? Thanks Jim
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in: Cummins Marine Engines
2 RepliesMay 21, 2019 at 3:12 pm While we are on the subject of QSB valve adjustment, my QSB 5.9 380hp is 11 years old with 1100 hours. As far as I am aware the valve lash has not been adjusted. When you say typical 5000 hrs between adjustments would that apply regardless of age? Or is it something that should be done every 10 years or so? QSOL says every 5000 hrs or 4 years but I have not heard of anyone doing it every 4 years.Last Post by:
posted: 4 years ago
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āExercisingā house deep cycle batteries
This topic has 4 replies, has 4 voices, and was last updated by
5 years ago January 31, 2019 at 7:23 am Just installed new start and house batteries. I read somewhere that itās a good idea to draw down the deep cycle batteries and then recharge them. Is there a preferred way to do this? Is this something most folks do or is it not that important? Thanks!
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in: General Discussion
4 RepliesFebruary 1, 2019 at 3:33 am Scott Lambert wrote: I would recommend fitting one, even though they are not cheap. Thanks for the input Scott. Yes a “monitor” is pricey and adds the other features Scott mentions but a simple “meter” is cheap and easy and gives you that one most important pc of info – accurate voltage at the terminals. The DVM: https://www.sbmar.com/product/smx-digital-dc-voltage-monitor/ The Article; https://www.sbmar.com/articl…Last Post by:
posted: 5 years ago
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Exhaust hose replacement
This topic has 3 replies, has 3 voices, and was last updated by
5 years ago October 31, 2018 at 7:19 pm Hi, I need to replace my 6 inch rubber exhaust hose. Any tips? Can I use some sort of lubricant to help the hose slide on without helping it slide off?
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in: General Discussion
3 RepliesNovember 2, 2018 at 4:41 am Use the graphite gasket sold here. Block sand the face of the turbo outlet to clean it up. Gasket can go dry. High temp RTV silicon never hurts, especially if there are imperfections left in the mounting face. Anti-seize lube on new mounting bolts. https://www.sbmar.com/product-category/engine-components/turbochargers-parts/Last Post by:
posted: 5 years ago
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Vessel View Fail
This topic has 12 replies, has 3 voices, and was last updated by
5 years ago June 22, 2018 at 1:20 am I have attached a photo of my vessel view display looking pretty sick. It is just showing horizontal white lines across the screen. Any one seen this before? Could it be a connection or will it need replacing? I have unplugged the connections on the back which has made no difference.
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in: Instrumentation & Electronics
12 RepliesSeptember 24, 2018 at 3:23 pm I have attached photos of SMX up and running, very happy! I have also attached a photo of the old smart craft wiring. As Corey says, one of the benefits of this system is its simplicity. The space under my helm station used to be a mess of tangled wires, now it is relatively simple and uncluttered.Last Post by:
posted: 5 years ago
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QSB HX zincs broke off, acid flush HX?
