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Failed after cooler core
This topic has 2 replies, has 2 voices, and was last updated by
11 months ago
May 26, 2023 at 10:00 am Twin QSB 5.9, 380 hp.Ā I ran my boat down the east coast to Florida.Ā Near the end of the trip, the starboard engine exhaust showed black smoke above 1800 rpm.Ā Assuming it was a rich condition, I cleaned and replaced the air sep filter and oil separator filter, drain and piping, checked the turbo etc. no improvement.Ā I finally pulled the after cooler and removed the core to find this mess (see pic). The core was destroyed and possibly, probabl…
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in: Cummins Marine Engines
2 RepliesMay 26, 2023 at 11:10 am Tony first off, thanks a for responding, and doing so, so quickly.Ā And yes, from the looks of the aftercooler core, this has been going on for a long time. The boat is a 2005.Ā I bought it in 2017 and had the after coolers serviced at purchase by Cape Cod Marine (a certified Cummins shop).Ā I saw the service work in process, disassembled, cleaned, plenty of the recommended grease.Ā Around three years ago, I serviced them myself using the same p…Last Post by:
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Twin 5.9 QSBs w smart craft – low voltage at key switch
This topic has 1 reply, has 1 voices, and was last updated by
1 year ago February 6, 2023 at 8:52 am I Ā have Ā 11 volts at port key switch in off position and 2 volts in on position. Ā Ā I have 13 Ā Volts from the battery all the way to the main station Ā extension Ā harness. When I turn n key switch voltages drops to 2 volts. Disconnecting main station extension harness from the junction box increases voltage at key switch to 13.
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1 ReplyFebruary 13, 2023 at 10:21 am I have 11 volts at port key switch in off position and 2 volts in on position. I have 13 Volts from the battery all the way to the main station extension harness. Where are you measuring this? When I turn n key switch voltages drops to 2 volts. Disconnecting main station extension harness from the junction box increases voltage at key switch to 13. If you disconnect the extension harness, you should have NO voltage at the KEY, this tells me that…Last Post by:
posted: 1 year ago
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QSB exhaust elbow insulation replacements
This topic has 3 replies, has 2 voices, and was last updated by
3 years ago April 29, 2021 at 10:54 am Does anyone have a recommendation for sourcing replacement insulation for the exhaust elbows. I don’t see them on the Seaboard site.
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3 RepliesMay 2, 2021 at 4:45 am Dave, You need to stand back 2-3 ft and post of pictures of the entire riser and the connection to the hose.. Maybe a few angles & perspectives…… What you have is 100% custom, and from the looks of the exhaust flange where it is attached to the turbo, I think you may have some other serious issues going on.. Best to REMOVE the insulation before you post better pictures..Last Post by:
posted: 3 years ago
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sudden power loss -> no throttle response
This topic has 9 replies, has 4 voices, and was last updated by
3 years ago
May 6, 2019 at 10:36 am Hi all – odd issue on one of my 2006 QSB 355s yesterday. After hitting ~1800 rpm my starboard motor lost power and I had to get home on idle rpm. Couldn’t get throttle response until a few hours later when I restarted the engines and starboard subsequently worked fine. I opened dash and verified throttle cycled through the linkage and was connected. After starboard started working again I took a trip, got on plane and everything was…
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in: Cummins Marine Engines
9 RepliesOctober 12, 2020 at 6:26 am Replacing the Medusa harness worked perfectly for me. I also went as far as using a toothbrush/corrosion X combo on all of the connection pins that attach from the engine to the Medusa. I never changed the coolant sensors but what I did instead was unplug both coolant sensors from the engines and connected Tonys terminating resistor. https://www.sbmar.com/product/cummins-marine-smartcraft-low-coolant-circuit-resistor/ Ive been trouble free sinc…Last Post by:
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QSB 380 Same RPM different Load
This topic has 17 replies, has 7 voices, and was last updated by
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 š Here are some technical details. WOT both engines show 99% load with about 100 RPM difference. With engine Sync ON at 2630 RPM Temp…
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17 RepliesJune 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:
posted: 3 years ago
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QSB 5.9 carbon/soot on rockers
This topic has 1 reply, has 2 voices, and was last updated by
4 years ago May 19, 2020 at 5:20 am I have twin QSB 5.9s. I removed the valve covers and inspected the rocker assemblies. The starboard engine was clean. The port engine rockers had a film of soot/carbon (easy to see on the red and yellow injector wiring). Any ideas why this would be the case? I am replacing all the Airsep filters as a precaution. Dave
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1 ReplyMay 19, 2020 at 5:47 am Change oil makes & be sure it meets Cummins specs, use genuine Cummins oil filters, and be sure you don’t extend oil change intervals.Last Post by:
posted: 4 years ago
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QSB 5.9 Oil Analysis
This topic has 5 replies, has 3 voices, and was last updated by
January 2, 2020 at 9:33 am I have a boat with twin QSB 5.9s. They are vintage 2004 and I have 1,100 hours on both. I have owned the boat for four years and have done oil analysis for the last two years. The results of both analysis show high aluminum (~100 ppm) content. The engines run very well, seem to match design numbers for rpm, fuel consumption, etc. and generate no apparent smoke. Any one know if there is an issues with these engines or any other possible expl…
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5 RepliesJanuary 4, 2020 at 5:11 am Tony, Thanks for the information, now I understand. I want to add: you and the team at Seaboard are astounding, I’ve never encountered folks with so much marine diesel knowledge. Thanks! DaveLast Post by:
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starting qsb 5.9 out of boat
This topic has 6 replies, has 4 voices, and was last updated by
December 17, 2019 at 3:09 pm hello, trying to figure out exactly what is needed for electronics to start a qsb on the shop floor? I do have a spare smart craft display along with a mercury dts throttle heads kicking around. I guess starting back at square one i picked up a low hour 380hp qsb for a spare, but when it came in there is a tag on the motor saying bad ecu, so just trying to evaluate what i have here. i also have a good ecu from a parts motor i can swap over if th…
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in: Cummins Marine Engines
6 RepliesDecember 18, 2019 at 4:43 am Hi Chris, I have two QSB 5.9 380s (circa 2004) on my boat with smart craft. I’d be glad to send pics or show you the install, if that would help. I also have the wiring diagrams. The boat is on stands in Yarmouth. Dave Carey 978-578-3242Last Post by:
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08 QSBās 400 freshwater hours, aftercoolers never serviced…
This topic has 2 replies, has 3 voices, and was last updated by
4 years ago August 18, 2019 at 9:23 am Buddy of mine is looking at a 2008 38ā Sabre with a pair of 400 hour 380 hp QSBās. The boat has spent its life in the Columbia River in the Portland area where the water is fresh not salt. Pictures show engines that look new with no sign of dirt, grunge, leaking or anything bad at all. My buddy has seen the boat and been aboard for a sea trial. He said that the engines ran like new, showed no signs of overheating and made full rpmās. The questi…
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in: Cummins Marine Engines
2 RepliesAugust 23, 2019 at 5:40 am You might find that those Aftercoolers are hard to take apart since they are over 10yrs old. Since Cummins did not lube the radiator core/aftercooler casing interface at the factory, you might be in for a bit of a surprise when they are dismounted, taken apart and the core needs to be “Persuaded” out of the casing. Yes the fresh water situation will be better than it being in Salt water but we are still talking 10+ years of marine …Last Post by:
posted: 4 years ago
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Cummins QSB 5.9 J39 J1939 No Data
This topic has 4 replies, has 3 voices, and was last updated by
4 years ago July 11, 2019 at 9:00 pm Hello, I have two QSB 5.9 355hp CM850 built in 2004 with Smart Craft 1.0 with vesselview4 displays. The issue I am having is I get the sim no J39 data error and J1939 no data. I also get low ECM voltate warring even though I have 12.7 volts everywhere a meter can go. As I have read on this forum the wiring from the engine should go as such from ECM to displays. ECM -> Smart Craft 1.0 “Medusa” harness -> extenstion harness -&…
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in: Cummins Marine Engines
4 RepliesJuly 12, 2019 at 12:57 pm You will also need to replace the SIM modules and ensure that they are current… we have them somewhere on the websiteLast Post by:
posted: 4 years ago
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Anodes in oil coolers
This topic has 4 replies, has 4 voices, and was last updated by
4 years ago
June 23, 2019 at 12:05 am Goodmorning, On the back of our QSC8.3 are 2 oilcoolers (see aolso attached pictures) – Mota transmission oil cooler for the Twindisc – Mota hydraulic oil cooler of which Wesmar stabilizers, bow and stern thruster run. The transmission cooler does not have any anode in it which has always surprised me. It is also a more complex devices of which I guess it has some thermostatic function? The (upper) hydraulic oil cooler is a very simp…
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in: Cummins Marine Engines
4 RepliesJune 23, 2019 at 10:52 pm Thanks for all the advice. If anything I found a topic that even Tony is unsure about š To ponder a little more. We have a Northern Lights genny with a Lugger diesel. In this Lugger there ZERO anodes which always baffled me. However one of the things they did that might explain this, is isolate the core in the HX. This is only clamped in rubber no contact with any other metal. That’s what started me thinking on the isolation of the hydraul…Last Post by:
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2013 6BT Cummins Tach Not working
This topic has 3 replies, has 4 voices, and was last updated by
4 years ago June 13, 2019 at 12:05 pm Hi Guys, Hopefully, you guys can help with troubleshooting why the tach is not working on my 2013 Cummins 6bt 210 hp motor. I have swapped the gauge panels from one engine to another and the tach will not work on the starboard engine. Once I swap the starboard gauge panel and connect it to the port engine the tach works which tells me its something between the motor and the gauge panel. Where should I start to look to find the issue? Thanks in a…
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3 RepliesJune 18, 2019 at 10:20 pm What sender do you have? I just dealt with one that was a mechanical sender. Was the same issue you are having.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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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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Wire connection SIM question
This topic has 3 replies, has 3 voices, and was last updated by
5 years ago
May 10, 2019 at 6:04 am So in this picture youāll see a white and a black wire. Iām assuming they are coming from the SIM module? If not what is it? But my main question is, these are connected directly to my battery…should they be, or should they connect somewhere else?? Iād rather have nothing connected to my batteries if I donāt have to other than the engine and battery charger thanks guys Cummins qsc8.3 600hp
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3 RepliesMay 10, 2019 at 6:02 pm Oh they need a fuse? They never installed fuse when they installed them…I guess Iāll be adding 30amp fuses this weekLast Post by:
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Engine Starts and Stops Immediately
This topic has 2 replies, has 3 voices, and was last updated by
5 years ago April 29, 2019 at 10:03 am I am sure this is something I have hooked up wrong, but here goes. I have twin QSB5.9 380HP in my boat. I just redid my entire helm and changed some wiring, I also have Vessel View Digital Gauges. The engines and gauges are 2004. My starboard engine works fine. On my port engine, when I turn on the key, the vessel view does not come on, it only appears when I engage the start button, then the engine kicks over, but when I let go of the star…
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2 RepliesApril 29, 2019 at 7:12 pm You need to post an ESN so I can see what ELECTRONIC version of Smartcraft you have.. Then, I can direct you to a proper wiring diagram……………..The Answer from Dave C is on the right track.. … Post a couple/three really good pics of the wiring beneath your starter motor where the magnetic switch is.. TonyLast Post by:
posted: 5 years ago
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QSB 5.9/Smart Craft scanner
This topic has 1 reply, has 2 voices, and was last updated by
5 years ago April 3, 2019 at 12:33 pm I have two 5.9 Cummins 2004 with 9 pin “round” data ports. Can I buy a 9 pin to 16 pin OBDII adapter and read codes on these engines? Thanks!
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1 ReplyApril 6, 2019 at 10:24 am I would guess Ebay would have stuff like that. What exact instruments do you have?? If those “round” Mercury Outboard Smatcraft” things, you are driving totally blind.– Any modern digital panel that reads your CM850 J-1939 output will do that plus you won’t be driving with blinders on… TonyLast Post by:
posted: 5 years ago
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QSB 5.9/Smart Craft scanner
This topic has 1 reply, has 2 voices, and was last updated by
5 years ago March 28, 2019 at 5:40 am I have two 5.9 Cummins QSB’s 2004 w Smart Craft instruments. Can I use an OBDII scanner if I get a 9 pin to 16 pin adapter to scan codes for these engines?
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1 ReplyApril 1, 2019 at 8:04 am The 9-pin diagnostic connector only has 4 pins, 2 for power and 2 for J1939 data. Your reader must be able to interpret J1939 DM1-based fault codes.Last Post by:
posted: 5 years ago
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Failed after cooler core
