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- Cummins Marine Forum Topics
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QSB 5.9 Coolant drain and fill
This topic has 3 replies, has 3 voices, and was last updated by
1 week ago April 27, 2024 at 1:40 pm Hello guys, I will be draining and replacing coolant on my 2005 Mainship for my first time. Ā In reviewing your technical info, you show a drain plug at the red arrow, but mine does not have a plug there. Ā I do see a plug at the other end of this tube, as shown in my photos where my finger is pointing (the next is the close up one is from underneath the tube). Ā Wondering if you can confirm if this would be the drain plug, and if you have any tips…
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in: Cummins Marine Engines
3 RepliesMay 3, 2024 at 2:16 pm The plug under here will drain the entire systemLast Post by:
posted: 1 week ago
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Qsb 5.9 belt squeak at startup
This topic has 6 replies, has 4 voices, and was last updated by
1 month ago April 8, 2024 at 1:01 pm Iāve read the other posts here on this topic with no luck. Every initial startup, the belt squeaks for 5-10min. Then no noises the rest of the day. Iāve Ā replaced belt, fresh water pump, raw water pump, tensioner, and alternator. Iāve noticed a lot more belt dust on that motor than the other and am at my wits end. Could the alternator be working too hard initially? It shouldnāt, as the batteries are always on the charger. I also could not find t…
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in: Cummins Marine Engines
6 RepliesApril 11, 2024 at 4:40 am Joe, Glad you sorted out theĀ what belt.Ā Great trick Next–Could the alternator be experiencing an abnormal draw at warmup?Ā 100% yes, but the only simple way to know is if you are monitoring battery terminalĀ voltage just before turning the key and watching it after start-up/warming up Say you are at 12.4-12.6-ish at the battery terminal and your cold alternator regulator set point is 14.0V.Ā The alternator will go t…Last Post by:
posted: 1 month ago
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Constant Torque Hose Clamps
This topic has 7 replies, has 6 voices, and was last updated by
1 month ago March 27, 2024 at 9:14 am Curious if there is any specification or guidance on tightening these hose clamps.Ā My impression is that the spring needs to have some give both to tighten and loosen to allow expansion.Ā Ā Anyone have any advice vs just tightening them ‘tight’ like normal hose clamps.
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in: Cummins Marine Engines
7 RepliesApril 3, 2024 at 4:53 am The tool that FireIsland1 indicated shows a torque of 60 inch pounds( as pictured on amazon) which is in range favoring the higher end.Ā I will add that tool to my kit.Ā Thank you all for some good ole learning.Last Post by:
posted: 1 month ago
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QSB 5.9 425 HO
This topic has 11 replies, has 6 voices, and was last updated by
4 months ago
July 11, 2022 at 5:10 am HiĀ We have a 2006 Sea Ray MY with QSB 5.9 425 HO.Ā I am trying to determine if we have a prop pitch issue.Ā I confirmed with Cummins technical assistance that the power curve that I have is correct.Ā We are able to achieve the correct RPMs at WOT and fuel burn is within the curve.Ā However, at 2000, 2200 and 2400 fuel burn is above the curve as shown below: C&S Ā Ā Ā Ā Ā Ā Ā Ā Cummins Spec Sheet Actual Ā Ā DifferenceĀ Ā Ā RPM …
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in: Cummins Marine Engines
11 RepliesJanuary 9, 2024 at 9:39 am Chris was wondering how you made out with tuning the props where did you wind up?ĀLast Post by:
posted: 4 months ago
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No oil in filter and odd oil pressure?
This topic has 11 replies, has 5 voices, and was last updated by
5 months ago November 26, 2022 at 4:28 pm Doing my end-of-season oil change on my QSC 8.3ās and I pulled the port on-engine oil filter and it was borderline empty! Is this something I should be concerned about? It is not a āremoteā filter, and is located right on the middle side of the engine.Ā My oil pressures all season were 52-55 PSI between both engines when running. Now theyāre 55 on starboard, 75 on port, but this is also just at idle at the docks, so maybe Port would drop down wh…
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in: Cummins Marine Engines
11 RepliesDecember 8, 2023 at 8:13 pm Now that you mention it. I havenāt been running the engine prior to an oil change because I have the Wolverine pan heaters on the oil pan, because the oil has been hot enough to flow well. Thatās probably why! ĀLast Post by:
posted: 5 months ago
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QSB 5.9 Operating Temp 210Ā°
This topic has 10 replies, has 9 voices, and was last updated by
7 months ago
September 11, 2023 at 12:55 pm A guy I know has a 39 SeaRay with QSB 5.9 380 motors. Ā At speeds above 18 knots he gets an overheat alarm. Ā Engines are at 210Ā° at 18 knots cruise speed (verified with laser therm). Ā His mechanic tells him 210Ā° is normal for that motor and he thinks the overheat alarm is due to a bad sender. Ā The local Cummins dealer says trucks are running that motor at 210Ā° all day long. Ā Is an operating temp of 210Ā° normal for this motor? Ā 210Ā° seems high to…
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in: Cummins Marine Engines
10 RepliesSeptember 27, 2023 at 7:23 am He is crazy. I had that same boat, if itĀ is a Sundancer, and after servicing everything, as mentioned by Steve, I ran that boat at 25-26 mph all day long and never saw temps above 180. I bet his EGT is off the charts.Last Post by:
posted: 7 months ago
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Cummins 480 CE 6CTA. White smoke and knocking
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This topic has 77 replies, has 12 voices, and was last updated by
7 months ago November 10, 2019 at 11:20 am Hey guys need some input. Think I have an idea whatās up but would like to bounce it off Tony and the other guys. So today driving home cruising one motor starts stumbling a bit , I start backing down to check whatās up and it stumbled right Down and shut off before I was able to. I changed Racor filter and re primed and after a lot of repriming finally got it to re fire. Motor now runs but has a top end knock and is pushing white smoke.Iām leak…
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in: Cummins Marine Engines
September 23, 2023 at 1:07 pm ???? ?????????? You need to start a new thread?
77 Replies
Last Post by:
posted: 7 months ago
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QSB 5.9 380hp prime lift pump
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago March 31, 2023 at 5:56 pm Hi there I am new to this forum. I have replaced 3 prime lift pumps on the above port motor in 7 years. There was a spare on board when I purchased the boat (Riviera 37 2008) so we are assuming one had been replaced prior. The starboard motor has never had an issue. Seems to me that there is another issue on the port motor causing these pumps to fail. I have been told the pumps are notorious at failing but this seems to be too much of a coincide…
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in: Cummins Marine Engines
1 ReplyApril 1, 2023 at 4:17 pm Check 3 things Pressure, temperature, voltage . Compare the data to the other engineĀLast Post by:
posted: 1 year ago
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After cooler bolts
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago March 20, 2023 at 10:11 am I was doing the after cooler service on this Diamond 330 and the core came right out. It was clearly greased last time. The bolts were another story. Two snapped after hours of effort. Trying to use an extractor cracked the housing on the one of top of the cooler cap bolts (Lower left in photo). What looks like pits/chips on the cap surface in the photo is just chips in the paint. It is in suprisingly good shape. I saw in a previous thread Tony …
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in: Cummins Marine Engines
1 ReplyMarch 20, 2023 at 1:48 pm Who cut the hose off with a wiz wheel? That need repair alsoLast Post by:
posted: 1 year ago
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2005 cummins qsb 5.9 fuel pressure
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago November 21, 2022 at 5:24 pm port engine lost power recently after an outstanding summer of run time. error message on new SMX display popped up. I replaced fuel filters and racor filter elements. Port was slightly darker than stbd filter. Stbd engine runs fine, westerbeck gen runs fine. Port Fuel filter full. Bled injector lines fuel leaked out but did not spray out. looking for suggestions. got several opinions,Ā bad injector causing lack of pressure injector pump soleno…
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in: Cummins Marine Engines
2 RepliesNovember 25, 2022 at 4:18 pm do you have a good cummins techLast Post by:
posted: 1 year ago
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QSB 5.9 Fuel Cooler Removal and SMX Kit..Anyone ??
This topic has 3 replies, has 3 voices, and was last updated by
1 year ago October 30, 2022 at 8:01 am Good day, Considering removing the fuel cooler on my QSB 5.9 480. Has anyone on this forum removed the fuel cooler off of their QSB 5.9? Any performance issues or any issues going forward after removal ? Thank you, Bill DĀ
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in: Cummins Marine Engines
3 RepliesNovember 5, 2022 at 6:23 pm I would think it would be as simple as taking the 2 lines off the cooler and connecting them together.ĀLast Post by:
posted: 1 year ago
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Lead in gear oil
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago October 27, 2022 at 9:01 am Hi, I sent a gear oil sample for analysis this fall and it came back as a severity 4 for lead.Ā I have a Twin Disk MG 5050-SC transmission.Ā Has anybody had a similar problem with this transmission or is the lead coming from somewhere else? Thanks.
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in: Cummins Marine Engines
1 ReplyOctober 29, 2022 at 5:36 am Probably gear oil cooler breaking down.Last Post by:
posted: 1 year ago
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Winterizing question
This topic has 3 replies, has 4 voices, and was last updated by
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 wasnāt pulling from the bucket and it …
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in: Cummins Marine Engines
3 RepliesOctober 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:
posted: 1 year ago
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QSB 5.9 428 WIF high water in fuel
This topic has 8 replies, has 3 voices, and was last updated by
1 year ago
July 19, 2022 at 1:04 am Helping a friend with his single engine boat with a QSB 5.9Ā all of a sudden its showing a warning for 428 WIF . going in to the menu to check for alarms it says starboard which I believe the STB part is just default for vessel view.Ā He has theĀ Cummins Mercury 3971758 SmartCraft Racor WIF Water Separator Sensor Wire Harness with the sensor in the racor, and on the same harness he has the racor smartcraft resistor Cummins P/N 3971759 . I have s…
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in: Cummins Marine Engines
8 RepliesAugust 15, 2022 at 4:07 am I guess I’ll just buy a new sensor and see if it works š¤·ĀLast Post by:
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QSB 5.9 230 hp not getting max rpm
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago
July 22, 2022 at 3:30 pm I have a 2009 QSB5.9 230 hp with ~2500 hours. It is in a trawler (single), and I typically run it between 1650 and 1800 rpm. Aftercooler serviced 1 year ago per sbmar recommendations – fully tested.Ā <br />yesterday I tried to run it up to max rpm and it wouldnāt go past 2000 rpm with minor black smoke. Engine temp was stable.Ā <br />I have a new environment air breather kit on it.Ā <br />engine runs great but wonāt spin abo…
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in: Cummins Marine Engines
2 RepliesJuly 22, 2022 at 5:03 pm Thanks for the reply. Because of where I live Ā – gulf coast of Florida, my hull and running gear is cleaned every 4 weeks and I get a report. I just had it done 2 weeks ago and Iām confident it is cleanĀLast Post by:
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Started QSB with return line closed – cannot re-start
This topic has 3 replies, has 3 voices, and was last updated by
1 year ago March 18, 2022 at 11:19 pm Hi.Ā I have a 2006 Cummins QSB 5.9 on a Trawler and it looks like I started the engine with fuel the return line closed.Ā I had an alarm ‘high fuel pressure – 100psi ‘ within a few seconds of starting and in a few more seconds the engine shut down.Ā The Fuel Cooler seems undamaged from the high pressure. The fuel return line is now open but I cannot start. Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā I have bled the filter with th…
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in: Cummins Marine Engines
3 RepliesJuly 12, 2022 at 5:57 pm What was the solution ?Last Post by:
posted: 1 year ago
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Unable to start my Cummins QSB 230 HP 2011 model
This topic has 4 replies, has 3 voices, and was last updated by
2 years ago
April 4, 2022 at 3:54 am Hi After replacingĀ my start battery, the engine will not start, and I get errors on my Vessel view. DRVP input low. Emergency stop error. I checked round and found the Battery Man, had not connected the negative cable for the engine start circuit, only connected the through negative for the Thruster Batteries. I have now connected it correctly, but the engine will still not start, and gives me the error codes above. What is DRVP ?? Would appr…
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in: Cummins Marine Engines
4 RepliesApril 12, 2022 at 2:43 am Found the fault before the mechanic came out, faulty emergency stop switch. All good now, thanks guys.Last Post by:
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QSB5.9 Oil Pressure Range
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago March 28, 2022 at 4:11 pm Ā I normally cruise with my QSB5.9 running about 1500 RPM with oil pressure at this speed in the 50 – 55psi range.Ā Sunday I ran the engine up to 2520 RPM for about five minutes.Ā Oil pressure went up to 69psi at this speed.Ā When I throttled back down to 1500 RPM my oil pressure dropped to 66psi – not back to the 50-55psi range I was expecting.Ā Anything I should be worried about here?Thanks, Roy
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in: Cummins Marine Engines
1 ReplyMarch 29, 2022 at 3:47 pm If you took the reading off instruments, you need to confirm it with a mechanical gauge. Then come back with findings.ĀLast Post by:
posted: 2 years ago
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Zinc Stuck in Heat Exhanger
This topic has 5 replies, has 4 voices, and was last updated by
2 years ago March 22, 2022 at 6:50 pm When I removed the zinc from the bottom of my heat exchanger on my 6BTA this winter, the cap unscrewed and came out but the pencil zinc was still in the heat exchanger. I tried to get it out but just ended up pushing it into the HE. Does this need to be removed? Or can I simply just install the new zinc and the other one will dissolve over time? The past owner of this boat said that this has happened to him before as well. Any way to prev…
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in: General Discussion
5 RepliesMarch 26, 2022 at 6:14 pm Just get a 22 cal. Gun cleaner and ream it outLast Post by:
posted: 2 years ago
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American Tug 34 Exhaust
This topic has 14 replies, has 7 voices, and was last updated by
2 years ago April 7, 2017 at 8:55 am Pictures of 2004 install.Ā I suspect the original elbow is near end of life.Ā Pictures attached.
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in: Cummins Marine Engines
14 RepliesMarch 2, 2022 at 5:19 pm Donāt make this your Final decision, phone a friend. Why would you invest in a ā near exact ā replacement when the original was not right. This makes no sense to me. Get something built properly and forget about it. Ā Maybe $5k . If you ruin the engine itās $40k and you still will need a new exhaust.ĀLast Post by:
posted: 2 years ago
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QSB 5.9 Coolant drain and fill
