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    • Cummins Marine Forum Topics
    • Running temp for QSB 5.9 engines.

      This topic has 7 replies, has 5 voices, and was last updated bypwrobert 9 months ago

      July 25, 2023 at 9:53 am Hello, My engines at cruise power (75-80% load) are running about 185 deg.Ā  Wondering if this is a concern at all. Aftercoolers will be serviced this winter.Ā  I have 2005 QSB 5.9 engines.Ā  What should the normal operating temp range be?

      Started by: marks737 in: Cummins Marine Engines

      7 Replies
      July 31, 2023 at 9:47 am I posted a lengthy reply with a couple pictures but it seems to be lost in space. Any errors on my part?

      Last Post by: pwrobert posted: 9 months ago

    • Diesel View to Vessel View 1.5 question

      This topic has 5 replies, has 4 voices, and was last updated byAndy 1 year ago

      November 20, 2021 at 8:34 am Hello, I’ve read all the great info on here regarding SmartCraft but just need a short answer. I found a used Vessel View 1.5 unit and would like to use it to replace the old Diesel View. Is this as simple as plug and play? Connectors on the back look the same. I realize the mounting hole would need to be enlarged a bit. Just wondering about the harnesses. Thanks in advance.

      Started by: marks737 in: Cummins Marine Engines

      5 Replies
      April 10, 2023 at 2:11 pm Tony, I think I may be at a dead end. I have installed a used VesselView 1.5, 84-8M0054863 harness, 4993480 adapter harness and an ignition harness to connect port and stb. junction boxes.Ā  However, I also have the old SIM revision, as defined in SBMAR’s “cummins-dieselview-display-upgrades” post. Do I understand right, that no matter what I do, the old SIM revision will not work with anything newer that the Diesel View unit th…

      Last Post by: Andy posted: 1 year ago

    • Winterizing question

      This topic has 3 replies, has 4 voices, and was last updated byJohn 1 year ago

      October 10, 2022 at 9:03 pm Winterizing question. I have QSB 5.9 engines .Was thinking about using fresh water tank filled with pink to feed engines through strainer flush fittings to winterize. (I would attach a short hose from engine room spigot to strainers).. Has anyone done this? Any potential issues? Not sure if engine suction along with fresh water pump pressure would be ok. Side note: I did do this on the genny last year as it wasnā€™t pulling from the bucket and it …

      Started by: marks737 in: Cummins Marine Engines

      3 Replies
      October 11, 2022 at 6:19 pm Hard to picture or know how the freshwater pump plays into it but the engine will develop plenty of suction so just make sure it’s sucking what you want it to. Ā Don’t try to feed the engine anything….let it drink with its own pump.

      Last Post by: John posted: 1 year 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

    • Fresh water flush with engine off.

      This topic has 11 replies, has 8 voices, and was last updated byDoug Dodge 2 years ago

      May 23, 2020 at 8:23 am I was just reading a comment Tony made about being able to flush the engine when off with the right exhaust. My exhaust is thru the bottom of the hull. So water is introduced in a shower ring just before it exits the boat. So water running simply falls out. Iā€™m removing my fuel cooler, installing a 115 degree pump exit and was going to run a hose down to bypass the cooler (6CTA8.3) Now Iā€™m thinking this would be the perfect spot to install a hos…

      Started by: Doug Dodge in: Cummins Marine Engines

      11 Replies
      July 1, 2021 at 9:07 am My set up is fantastic! Very simple and only take a couple of minutes (by myself) to flush with the engines off. Its so simple to do, I flush these engines every time I start a motor. I can do this because (as you can see in the pictures I posted) my exhaust is discharged directly through the bottom of the hull (NO Exhaust lift)(not common) As for yours, its not the exhaust leaving the engine you have to evaluate, it how it gets out of the boat…

      Last Post by: Doug Dodge posted: 2 years ago

    • 2005 QSB 5.9 Alternator question

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 3 years ago

      March 2, 2021 at 12:31 pm Hello. I have QSB 5.9 circa 2005 engines. Need to replace an alternator. Looks like the 19SI is correct but not sure if the 105 amp or 145 amp is appropriate. Can’t get to motors now due to shrink wrap. Thanks in advance for your input. BTW Replacing an alternator due to an occasional intermittent metallic rubbing sound.

      Started by: marks737 in: Cummins Marine Engines

      1 Reply
      March 2, 2021 at 8:26 pm Factory would have been a 105A unit.. No need to upgrade unless you need more power due to high DC house loads ..

      Last Post by: Tony Athens posted: 3 years ago

    • Antifreeze quantity for winterization

      This topic has 1 reply, has 2 voices, and was last updated byRob Schepis 3 years ago

      October 30, 2020 at 1:51 pm Hello. Have QSB 5.9 engines. Is 7 gals of antifreeze enough to run through each engine for winterization?

      Started by: marks737 in: Cummins Marine Engines

      1 Reply
      October 30, 2020 at 3:24 pm Should be fine. I run 6 gallons through my 6BTAā€™s. I first pull the zincs to drain the coolers to minimize dilution. I catch what drains out the transom exhaust outlets and check with a refractometer and itā€™s always a match to whatā€™s in the jug.

      Last Post by: Rob Schepis posted: 3 years ago

    • Dark Engine oil

      This topic has 3 replies, has 3 voices, and was last updated byFrancis Valerio 3 years ago

      September 7, 2020 at 7:26 pm Hello. Have twin qsb 5.9 engines. Engine oil is black. Iā€™ve read that this is normal for diesels? I change oil at end of Every season. Is it ok to refresh oil by draining a gal and replacing with fresh oil until end of season full oil change?

      Started by: marks737 in: Cummins Marine Engines

      3 Replies
      September 11, 2020 at 5:31 pm You are totally OK. The oil gets black very quickly and is NORMAL. 60-75 hrs is no problem and no need to change the oil except the one time for the season in your case…

      Last Post by: Francis Valerio posted: 3 years ago

    • QSB 380 Same RPM different Load

      This topic has 17 replies, has 7 voices, and was last updated bymarks737 3 years ago

      May 11, 2020 at 6:33 am Just got 390 sea ray with 380 QSB 1000 Hours. Engines were surveyed and oil samples came clean. When I ran the boat for the first couple of days with engine sync ON, I’ve noticed that the port engine burns 2 more gp/h more and has a higher load by about 10%. I’m worried sick that I got a broken engine šŸ™ Here are some technical details. WOT both engines show 99% load with about 100 RPM difference. With engine Sync ON at 2630 RPM Temp…

      Started by: Roman Prigozhin in: Cummins Marine Engines

      17 Replies
      June 27, 2020 at 6:41 am I have an ’05 390 Sundancer as well with QSB 5.9’s. Just had props scanned and repitched because I was above the curve and wasn’t making max RPMs. Props scanned at 21×23 in. They repitched to 21x 21.5 in and that brought me down to the curve. Also had a cyclical vibration at around 1000 RPMs that went away with the prop service.

      Last Post by: marks737 posted: 3 years ago

    • QSB 5.9 Overprop question

      This topic has 4 replies, has 3 voices, and was last updated bymarks737 3 years ago

      June 8, 2020 at 9:23 pm Iā€™ve read all the great info here on engine load/fuel burn etc. After checking my numbers it looks like Iā€™m overpropped. WOT only yields 2890/2950 rpms at 99% load. And my cruise burn numbers are above the curve by 2-3 gph. Engine temps are around 175 deg. No black smoke. Aftercoolers/Heat Exchangers just serviced along with new gear coolers. Spoke to a prop shop who said WOT should be at least 3050rpm at approx 96% load. My question is how …

      Started by: marks737 in: Cummins Marine Engines

      4 Replies
      June 9, 2020 at 12:12 pm Oops! My bad! Thanks

      Last Post by: marks737 posted: 3 years ago

    • Flush connection question

      This topic has 12 replies, has 6 voices, and was last updated byTony 4 years ago

      April 26, 2020 at 1:14 pm Hello. I’ve enjoyed all the posts about fresh water flushing. I currently have flush connections on my strainers that I connect the hose to directly. I’d like to add a ball valve and quick disconnect to avoid having to screw the hose connection on and make it much quicker. Just wondering if you guys see any issues with a quick disconnect type connection? Also, after shutting engine down and the fresh water is still on, does the e…

      Started by: marks737 in: Cummins Marine Engines

      12 Replies
      May 1, 2020 at 9:32 pm Thanks heaps Russ! Looks like it was time well spent. Great setup. Cheers Tony

      Last Post by: Tony posted: 4 years ago

    • Engine room temp

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

      April 26, 2020 at 8:08 am Hi guys… just out of curiosity what are you using to monitor your engine room temperature? Anything special besides a normal thermometer?

      Started by: Don Willis in: Cummins Marine Engines

      6 Replies
      April 27, 2020 at 5:27 pm Hi Rob, Thanks for the link. It’s a good start. Best, Yury

      Last Post by: Yury posted: 4 years ago

    • SMX water pump replacement on QSB

      This topic has 3 replies, has 4 voices, and was last updated byMike Mason 4 years ago

      April 15, 2020 at 9:07 am Hello. Just wondering how difficult it is to replace the water pumps on QSB 5.9 engines circa 2005 with SMX pumps. The SMX pump says “plug and play”. Can someone explain the replacement process? I’m assuming plug and play means that the existing pulley assembly stays on and the new pump shaft plugs in so to speak? I am very handy but have never replaced water pumps. Any input would be appreciated! Thanks!

      Started by: marks737 in: Cummins Marine Engines

      3 Replies
      April 16, 2020 at 5:46 pm just did this. take belt off remove entire pump bracket (4 bolts) keep in mind there are small alignment pins under here so may need to tap on outside of bracket with a mallet to break loose swap pump and pulley replace super easy and 100% plug and play mike 858 220 8947 if you have questions

      Last Post by: Mike Mason posted: 4 years ago

    • Winterizing 480 ce

      This topic has 7 replies, has 7 voices, and was last updated byKevinS 4 years ago

      December 18, 2019 at 2:08 pm I have a 2004 38 Rampage with 2 480ce’s . The boat came with Barnegate Bay strainer boxes instead of Grocco Bowl Sea strainers. Its real hard to winterize the raw water system …I have to pull both inlet hoses off the sea cocks and connect to 5 gallon pail . Any better way of getting anti-freeze into system ? Would appreciate any input. By the way …I dropped a valve 2 days after closing on the boat in Fla. trying to bring it bac…

      Started by: David E. Roshak in: Cummins Marine Engines

      7 Replies
      December 28, 2019 at 9:45 am A permanent flushing fresh water flush system that can be utilized for winterization is the right way to go, but in the absence of that I have found the Sea Flush kit a good way to go. Their “snorkel” or flexible hose is 1 1/2″ and gives very good flow. I’ve been using this to flush my QSC and NorthernLights generator for the past 4 seasons and it works great. Set up the Sea Flush on the filled strainer and a PG filled 5 …

      Last Post by: KevinS posted: 4 years ago

    • ZF transmission cooler overheat alarm

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

      September 25, 2019 at 8:53 pm Hello. We were returning on a cruise and got an audible gear cooler over temp alarm on port eng. Gear oil temp was at around 220 deg. Shut down engine let it cool. Checked fluid level which looked ok. Dipstick not melted or deformed. Ran boat home at reduced speed with port gear temp in the 175-188 deg range. Transmission shifts smoothly, no noise, not hot to the touch. However, shaft is turning slowly in neutral. Mechanic inspected gear cooler…

      Started by: marks737 in: Marine Transmissions

      1 Reply
      September 26, 2019 at 6:03 am Start with this: 1) Exactly model of the transmission 2) 4-5 pictures of the gear showing all–top, sides and from the back looking fwd and general access of the engine / gear and room around it 3) Exact oil type and last proper service per ZF guidelines 4) Some history of past operation 5) Picture of the gauge or display that gave you this alarm 6) Dragging in neutral– Explain better. shaft is turning fwd or rev at the dock? …

      Last Post by: Tony Athens posted: 4 years ago

    • Question on Engine/Prop load

      This topic has 8 replies, has 3 voices, and was last updated byRob Schepis 4 years ago

      August 15, 2019 at 2:57 pm Hello gentlemen. I’ve read your great articles regarding propeller load and engine life. I have a 2005 Sea Ray Sundancer with Cummins QSB 5.9 380’s. First diesel boat and love it. Just got back from a 6 day cruise and paid close attention to my fuel burn as it relates to the performance chart that you reference. At a comfortable cruise power (about 2450-2500 RPM, about 75%load) which yields about 21knots, it seems I’m burn…

      Started by: marks737 in: Cummins Marine Engines

      8 Replies
      August 17, 2019 at 12:30 pm marks737 wrote: For exampleā€¦if the same engines and props are driving two different boats. One weighs 20,000lbs and the other 35,000lbs. Wouldnā€™t the engines on the 35,000lb boat be under a much greater load/fuel burn to achieve the same RPMā€™s? “Same engines and same props”, well then yes for sure but those two vessels would never use the same gearing/propping.

      Last Post by: Rob Schepis posted: 4 years ago

    • Coolant recovery tank level

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

      July 12, 2019 at 6:32 am Hello. I have QSB 5.9 engines. Just wondering if the plastic coolant recovery tank on the back of the engine should have coolant in it. Mine are empty and was wondering if I need to add some. In my previous gas boats, there was always a cold and hot level line on these containers. Thanks

      Started by: marks737 in: Cummins Marine Engines

      1 Reply
      July 12, 2019 at 10:18 am 1/3 full when the engine is cold.

      Last Post by: Anonymous posted: 4 years ago

    • QSB 5.9 running temps

      This topic has 3 replies, has 3 voices, and was last updated bymarks737 4 years ago

      June 29, 2019 at 5:43 am Hello guys. Just wondering if these temps are ok. Cruising yesterday at around 78% load with a boat full of guests my Engine temps on the Vessel View showed: Port 180 deg., STB 178 deg. Are these temps ok or should they be down around 170 deg.? Thanks!

      Started by: marks737 in: Cummins Marine Engines

      3 Replies
      July 3, 2019 at 1:29 pm Thanks!

      Last Post by: marks737 posted: 4 years ago

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Viewing 20 topics - 1 through 20 (of 24 total)
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