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- Cummins Marine Forum Topics
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QSC 8.3 turbo
This topic has 6 replies, has 2 voices, and was last updated by
1 month ago April 8, 2024 at 4:09 am I’m looking for a QSC turbo. Ā Ā The part number on the turbo is 40387490, which doesnt match up to anything listed for that motor on this site. Ā Any ideas?
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in: Cummins Marine Engines
6 RepliesApril 9, 2024 at 6:57 pm All looks very good to me……..USE the Graphite gasket ( not the OEM SS one) — new hardware with never-seize on the boltsLast Post by:
posted: 1 month ago
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Alternator overcharging
This topic has 2 replies, has 3 voices, and was last updated by
1 month ago
April 7, 2024 at 4:48 am I am wanting help to solve, what I understand is a very unusual problem, with a 24V Delco 22S1 alternator on a youngish Cummins 6CTA 8.3 mechanical diesel engine. It has suddenly begun to continually pump out highly fluctuating / high current into a bank of 2 x 12V, fully charged, (electrolyte SG > 1.24) lead acid / deep cycle batteries – connected in series. The Amps range is about 15-70 Amps at the idle RPM of 600. The duration of ea…
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in: Instrumentation & Electronics
2 RepliesApril 8, 2024 at 2:32 pm Tony is an expert, I am not but I agree with him.Ā Ā Take it to a good repair shop and if need be is get a good marine electrician down to have a go over. Just because it is a new alternator does not mean it cannot have a problem.Ā Ā The problem of course could lie elsewhere.Last Post by:
posted: 1 month ago
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6CTA Air Filters – 2 part question
This topic has 5 replies, has 5 voices, and was last updated by
April 5, 2024 at 9:32 am Looking to either service or replace my air filters… SN 46309849 SBMar store states S&B Air Filters DO NOT replace Walker Air-Sep filter elements. I don’t know what a Walker Air Sep filter is.Ā Current one has a metal end cap and some holder springs..Ā Second part – I highly doubt the air filter has ever been changed in the life of the boat.Ā How much of a service item is this really for people?Ā Is this a regular se…
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in: Cummins Marine Engines
5 RepliesApril 8, 2024 at 2:40 pm The Walker Air Sep is intended to separate the oily vapour ejected from the crankcase from the actual air flow so the oil can be discarded without fouling the air filters s0Ā quickly. Seaboards’Ā crankcase venting is another way to do the same thing.Ā Ā Look it up.Last Post by:
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6cta Motor Mounts – How to test?
This topic has 9 replies, has 3 voices, and was last updated by
3 weeks ago April 4, 2024 at 5:15 pm Purchased this 2001 Tiara 3800 with 6CTAs 4 years ago, these were the mounts on the vessel, not sure how far they date back but I am starting to wonder if they are good or not, the left motor seems to vibrate alot more than it used to under way.Ā Ā Ā Ive been reading some threads about alignment as well, anything obvious to look at or photograph to be able to tell? The props were fixed at my inspection survey, and I have not hit anything that I a…
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in: Cummins Marine Engines
9 RepliesApril 27, 2024 at 5:00 am Could be prop(s) related.Ā When she was on the hard I would have pulled the wheels and had them scanned.Last Post by:
posted: 3 weeks ago
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Qsb 6.7 leaking water out of both check valves on the aftercooler
This topic has 1 reply, has 2 voices, and was last updated by
1 month ago April 4, 2024 at 4:57 pm Hey everyone. I have a water leak coming out of both my aftercoolers. Itās leaking out of the check valve or condensation drain on the bottom of the aftercoolers. Starboard is worst than the port. Port being more like a sprinkle and the starboard more like a constant trickle of water. Could this be a good indicator for a damaged core?
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in: Cummins Marine Engines
1 ReplyApril 10, 2024 at 4:28 am 1————Taste the water– If salt water, you haveĀ issues that must be dealt with ASAP 2———-Last time your aftercoolers were off the engine and serviced per my protocols?Ā 3— Vintage of the engines– Years in service and total hours 4—-When did you start noticing the leaking? 5——-Post good pics of the overall installation– let me see what y…Last Post by:
posted: 1 month ago
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QSB 6.7 Fuel Pump question
This topic has 4 replies, has 3 voices, and was last updated by
1 month ago
April 4, 2024 at 3:58 pm An acquaintance of mine made a mistake. He was changing his fuel filters and started his engine without turning the fuel feed and return lines on. He stated he let it run for about 5 seconds, noticed it sounded rough, and then again for about 10 seconds. He said he ended up with about a pint of diesel in his bilge with spray around the fuel pump. He cleaned it up, and the engine ran fine. However, he noticed a slight diesel residue at the bottom…
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in: Cummins Marine Engines
4 RepliesApril 8, 2024 at 4:36 pm Thanks Clark, my parts book shows a breakdown of the fuel pump with three o rings, but curiously doesnāt show the shaft seal. His engine is the same as mine. We will see what happens.ĀLast Post by:
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Rust in Coolant pipe
This topic has 2 replies, has 3 voices, and was last updated by
April 4, 2024 at 10:12 am Took the heat exchanger off my 6bta to get cleaned. Going to reinstall it with all new hoses and found the pipe leading to the thermostat to be extremely rusted. Anything I should do for this issue? Or just flush remaining coolant as much as possible and fill with new?
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in: Cummins Marine Engines
2 RepliesApril 8, 2024 at 11:57 am If you can, take a sample of the so called coolant and send it to an oil testingĀ lab.Ā Yes, they do coolant testing also. Heavy rust like that says you have had seawater enter the engine which could do interior damage. Pressure test the system for leaks. Remove as much rust as you can.Ā Ā Then use a product such as Cummins cleaner,Ā RESTORE, following directions for treatment AND removal/flushing.Ā Ā Be prepared to do it a couple of times.Ā Ā Ā R…Last Post by:
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Sharing QSB 5.9 Freshwater Flush Zincs
This topic has 3 replies, has 3 voices, and was last updated by
1 month ago April 3, 2024 at 11:17 am Hello forum members, I figured I’d share the pictures of the three zincs removed from the QSB 5.9 480 after a five month summer season up here in Kittery Maine. I was diligent in freshwater flushing the engine after each use. Total hours on the season was +- 150 hrs. burning 4 gal/hr on the season. From L to Right: Bottom of after cooler…..Top of aftercooler….Heat exchanger. Note the degradation in the bottom aftercooler zinc&#…
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in: Cummins Marine Engines
3 RepliesApril 5, 2024 at 8:36 am 100% freshwater hose blasting away through the T adaptor with engine seacock “closed in the video” and engine running. About halfway through the season I flushed with seacock “open”. It was a bugger reaching down and closing the 2″ seacock and then re-opening. I also think the zincs look normal. Prop shaft & rudder zincs (Godfrey brand, not cheap Camps) about 70% consumed, no complaints. The proof of the results…Last Post by:
posted: 1 month ago
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Feeding 6CTA 8.3 with a backup pump
This topic has 1 reply, has 2 voices, and was last updated by
1 month ago April 3, 2024 at 10:10 am After installing the SBM DD filter system, I want to plum it so I can bypass these filters in the event of an at sea clogged filter. I have a separate filter system using FS1218 and a Morco pump. I can easily plum this system to feed both my engines in case of a failure. This pump is capable of 2.5 GPM and up to 20PSI. Is it OK to have this feeding my engines? My current system is gravity feed, so I don’t know what kind of head pressure is…
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in: Cummins Marine Engines
1 ReplyApril 10, 2024 at 4:19 am 20 PSI is OK–Ā Be sure youĀ put monitoring gauges on the custom system.Last Post by:
posted: 1 month ago
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6cta slow acceleration and black smoke
This topic has 2 replies, has 3 voices, and was last updated by
1 month ago
April 3, 2024 at 8:16 am I am having slow acceleration and black smoke from 1300 to 2200 rpms. Takes about 15-20 seconds to go through that rpm range. Boat is 40ā Ā just had bottoming done, serviced aftercoolers, heat exchangers, impellers, and fuel. I do not have boost gauges.Ā
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in: Cummins Marine Engines
2 RepliesApril 3, 2024 at 11:34 am No idea why you’d check your fuel filters w/black smoke, but the air filter isn’t a bad idea.<br /><br />Better than that, navigate to the low power troubleshooting guide on this site and go through it step by step.Last Post by:
posted: 1 month ago
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Where are drain plugs/cocks located to empty QSB 5,9 for coolant/anti-freze
This topic has 5 replies, has 3 voices, and was last updated by
1 month ago April 2, 2024 at 1:46 am Trying ot source proper drawings on where the drain plugs etc are located in order to change the cooling fluid on my engine.
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in: Cummins Marine Engines
5 RepliesApril 16, 2024 at 6:26 pm To access a PDF attachment you need to click on the red text pdf filename, not the thumbnail image.Last Post by:
posted: 1 month ago
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6CTA Low Oil Pressure Hot Idle
This topic has 3 replies, has 2 voices, and was last updated by
6 days ago April 1, 2024 at 8:48 am Both motors (2003 6CTA’s) Ser#46309849 have similar oil pressures at startup.Ā Both motors have similar pressures at cruise speed – 50ish PSI. Hot idle port side pressure dropped to the point of alarm.Ā Tends to run very low at idle but never alarmed before.Ā Starboard side seems to stay in the 20psi range. Reading that it could be the oil pressure relief valve but doesn’t make much sense.Ā I was under the impression that was f…
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in: Cummins Marine Engines
3 RepliesMay 14, 2024 at 5:12 am Following up on this – like many Sea Ray’s – there are mechanical gauges (pressure and temp) hard lined into the motors.Ā The gauges at the helm are reading somewhere in the 15psi low range compared to the mechanical.Ā This is leading me to believe that I’m looking at either a sending unit issue, connection issue, or gauge issue.Ā Ā Will keep this thread updated until resolved.Last Post by:
posted: 6 days ago
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Racor water probe resistance
This topic has 1 reply, has 2 voices, and was last updated by
1 month ago April 1, 2024 at 7:34 am I’ve got a QSB 5.9’s with Vessel View 4 displays and Racor water probes integrated into the system. I need to replace the probes but do not what resistance value I need. Both probes are bad and meter open so I’m unable to determine the resistance . Racor offers 2 models at 83K and 220K-what value do I need to be compatible with the Vessel View system?
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in: Instrumentation & Electronics
1 ReplyApril 10, 2024 at 4:12 am This is a all I haveĀ related to this..Last Post by:
posted: 1 month ago
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6BTA-M1 shuts down and will not restart
This topic has 9 replies, has 3 voices, and was last updated by
1 week ago
April 1, 2024 at 5:06 am Hi – 1995 Albin 28 – 6BTA, unknown hours.Ā Ā We’ve had it about a year now but only put about 60 hours on it.Ā Ā A few months ago it died suddenly under acceleration.Ā Ā It restarted about 30 minutes later after several tries and seemed to run fine.Ā Not knowing much at the time, we asked the mechanic to look over the fuel supply and he reported back that the filters were clean and there didn’t appear to be any problems.Ā It…
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in: Cummins Marine Engines
9 RepliesMay 13, 2024 at 6:20 am Over the weekend, I replaced all of the fuel lines from the tank to the lift pump and replaced the return line from the high pressure pump to the tank.Ā Replaced both filters.Ā The first filter, Racor, had barely a teaspoon of sludge in the bowl, but the element looked fine.Ā The second filter is metal so we can’t see what’s happening in there.Ā I filled both filters with fuel before installing.Ā The engine fired up after a few short…Last Post by:
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Hydraulic Steering Fill
This topic has 5 replies, has 4 voices, and was last updated by
March 30, 2024 at 7:18 am Replaced the lines. Trying to figure out best method to refilling and bleeding the air out.Ā <br /><br /> Also Iāve seen the seaboard team use reservoirs for the hydraulic fluid. Where can I source the reservoir?
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5 RepliesMay 13, 2024 at 8:31 pm For the model of pump: –how old id the boat? -Post some good, clear photos and one of us can likely offer some good suggestions.Last Post by:
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Engine vibration when idle and in gear
This topic has 2 replies, has 2 voices, and was last updated by
1 month ago March 29, 2024 at 7:20 pm Dear Friends, I have the Hatteras 41 C with 2 x Cummins 450hp Diamond series with Twindisc gearbox transmission.Ā Drive shafts new and balanced, shaft alignments good. New cutless bearings, new bullflex coupling rubbers. When Port engine at idle low rpm notice high vibration at idle, increase rpm slightly vibration disappears.Ā Ā WhenĀ Port engine in gear forward or reverse low rpm high vibration shaking, soon when rpm increase above 800 –…
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in: General Discussion
2 RepliesMarch 30, 2024 at 6:57 pm Tony, thank you will first start to confirm true RPM with strobe light. P & SB engine RPM currently the same at idle. Only P engine vibrates in idle and when in gear. SB engine no problem. I am not sure the connection between Cummins engine and Twindisc gearbox configuration? Damper plate? Springs? Rubber?Last Post by:
posted: 1 month ago
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SMX 1730 Leak
This topic has 3 replies, has 2 voices, and was last updated by
1 month ago
March 29, 2024 at 2:00 pm I purchased the pump for a ReCom 370 B and had my mechanic install 4/22. Launched boat for the season yesterday and noticed what appears to be corrosion below the bottom wrap hole on the pump and salt on the mounts. Pumps has less than 200 hours on it. What are my options? I replaced the Sherwood that came with the engine that lasted 5 years and 1400 hours. Only reason I replaced it was because I was afraid of a failure based on what I was readi…
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in: Cummins Marine Engines
3 RepliesApril 2, 2024 at 11:50 am Tony, Thanks. I cleaned the area up and ran it for 20 min at idle at various RPMs from low to medium and noticed water on the paper towel I put below the pump so it appears it needs replacement now. Is there any way you can send me an exchange pump so I can have my mechanic remove and install the same day? Iāll give you a credit card number if needed. The issue with sending it back is that I have have to pay my mechanic twice to re…Last Post by:
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Cummins 4BT high idle????
This topic has 1 reply, has 2 voices, and was last updated by
1 month ago March 29, 2024 at 1:41 pm Hello Guys,<br />My 4BT was actually a 4BTA that someone deleted the after cooler and recalibrated the Bosch high pressure pump. That last view weeks when I go to just start and run my engines to exercise them, I noticed my port engine warming up quicker and today I realized it was idling at 1200 rpmās. My starboard engine idles at 800rpms. I was curious if this could be a caused by a build up of some type, since I have only been idling th…
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in: Cummins Marine Engines
1 ReplyApril 10, 2024 at 4:06 am Post very good pictures of the engine–all of it–especially the area on and aroundĀ the injection pump and all modified plumbingLast 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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Cummins 4BTA 250 –Starboard engine WOT low/Power low
This topic has 7 replies, has 3 voices, and was last updated by
1 month ago March 26, 2024 at 4:01 pm Starboard engine not reaching WOT only hitting 2900, Port will make 3200rpm I’ve attached a spreadsheet with rpms, boost and egt values on both engines, please have a look. Testing was done with full load of fuel, water, 5 persons and Gear/food for a week. Ā Port engine 150hr/3year old major rebuild, runs great, little white smoke at startup, makes WOT 3200. Port engine WOT (3200) has steady even 30 PSI boost. Starboard engine 700 plus hou…
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in: Cummins Marine Engines
7 RepliesMarch 27, 2024 at 5:21 am Have yopu gome thru the list in this article and not skipped anything? https://www.sbmar.com/featured-article/understanding-low-power-troubleshooting/ Ā ĀLast Post by:
posted: 1 month ago
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QSC 8.3 turbo
