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- Cummins Marine Forum Topics
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Slow Starting Speed on QSM11
This topic has 8 replies, has 2 voices, and was last updated by
1 year ago March 14, 2023 at 10:07 am Greetings, I tried to submit this message earlier, but didn’t see the message posted. My port engine turns over much slower than my starboard engine during starting (engine battery was recently replaced). When cold starting, I have to connect the house battery in parallel. When starting a second time, I don’t have any issues and can start with just the engine battery and speed is higher.Ā the terminals look good from battery t…
8 RepliesMarch 20, 2023 at 5:02 pm You found your answer–Now find the weak/high resistance connection(s)Ā or cable. Many to check on the POS side. Less on theĀ POS side….. If you had a 2/0 cable long enough, run it in parallel, directĀ from BAT POS to the POS stater lug for a test.. Bypass the big switch, etc. But check all the NEG’s first.. All clean and shiny/tight and common lithium grease on all points of contact.Last 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 …
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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Rydlyme
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago
March 19, 2023 at 4:55 am Hi Ā Do people do this on QSB 5.9s? I tried today and after initial water flowed through it then all backed up and came out of entry hose instead of ‘return’ – I then tried back flushing it so from exhaust elbow end and same thing happened – could this be because not enough overall volume in bucket and therefore pump or potentially pump too aggressive – ? Any help gratefully rec’dĀ Didnt get to rydlyme it as o…
2 RepliesMarch 20, 2023 at 1:47 am Thanks SteveĀ Ā Ā Yes cleaned after cooler and lubed- was clogged up hence thought about doing the rydlyme – sorry pic after attempt – did remove hoses as you explainedĀ have not removed HX tho and cleaned – its hard here to get people that work on these things – only about 3 – 4 techs in Uk that will touch so getting anything done within a reasonable turnaround time is almost impossible i will research HX removal an…Last Post by:
posted: 1 year ago
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QSB 5.9 Performance
This topic has 3 replies, has 2 voices, and was last updated by
1 year ago
March 19, 2023 at 9:48 am I operate a 44′ Armstrong catamaran that is powered by 2 Cummins QSB 5.9s. The port engine was blowing antifreeze out of the exhaust and the boat was taken in for service. The mechanic found a cracked exhaust manifold on the port engine, broken head gasket and the turbo bearings to be worn out. The shop replaced the head gasket, machined the head surface, replaced the head gasket and the turbos in both engines and the boat was put back int…
3 RepliesMarch 19, 2023 at 11:04 am Here are some pictures of the engine before and after the serviceLast Post by:
posted: 1 year ago
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Dodge Ram Alternator Bracket
This topic has 2 replies, has 3 voices, and was last updated by
1 year ago March 13, 2023 at 6:55 am I’m investigating alternator alternatives for my engine.Ā Will an alternator bracket from an 89-93 Dodge Ram truck fit on my 1986 Cummins 6BT engine to allow for the installation of a 4-inch split mount (J180) alternator?Ā I currently have a stock 2-inch mount.Ā Also, will the alternator brace link need to be changed?Ā Ā Thanks in advance for any advice.
2 RepliesMarch 19, 2023 at 7:08 am You need to consider the location of the “automotive” bracket that you want to use on the “marine” application.Ā Look at what you have and look at some pics of the automotive application and see if they could possibly interfere with the seawater pump plumbing and / or the heat exchanger plumbing.Ā I am only guessing if either is even possible to interfere bc I am not familiar with the automotive style (I never owned one),…Last Post by:
posted: 1 year ago
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6BTA Belt Concerns
This topic has 4 replies, has 3 voices, and was last updated by
1 year ago
March 17, 2023 at 7:29 am Last trip out just cleared the marina entrance I was watching the engines warm up at 1000 rpm, I heard a sudden scratching sound.Ā Pulled back and looked into the engine room.Ā Immediately saw frayed pieces of belt on the port engine.Ā Got back to the dock and discovered the port belt to be frayed along the edge. Removed the damaged belt and bought a new one.Ā Genuine Cummins belt (3288689) A little history hereā¦6BTA 330s Recons installed in 200…
4 RepliesMarch 18, 2023 at 1:31 pm Tony, Yes, 7 Ribs.Ā New Genuine Cummins belt had 8.Ā I also picked up 2 NAPA belts that interchanged to the Cummins 3288689 part number and they also have 8 ribs.Ā ĀLast Post by:
posted: 1 year ago
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DieselView turning off after a few seconds
This topic has 1 reply, has 1 voices, and was last updated by
1 year ago
March 17, 2023 at 10:48 am I’ve got a trawler with twin Cummins QSC 8.3 engines running DieselView with instruments at both helms.Ā I now have a problem with the port engine DieselView instrument (or at least that is where I am seeing the issue).Ā When I enable power to the port engine using the rocker switch at the salon panel, the DieselView instrument turns on for a few seconds and then turns off.Ā Subsequent attempts at turning the rocker switch off and then on …
1 ReplyMarch 17, 2023 at 2:20 pm I may have found the issue.Ā I found the following post, which helped a lot: https://www.sbmar.com/community/topic/qsm-11-mysterious-shutdowns/ I found the same 24 to 12v regulator the post’s author mentioned and I test 24v going in, but not 12v coming out.Ā I’ve got a converter I will test to confirm the issue. sbmar sells this converter as a replacement: SMX DC/DC 24V to 12V 35A Voltage Converter, Regulator (SmartCraft v1.0) Is thi…Last Post by:
posted: 1 year ago
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Cummins Vessel View Interface Panel
This topic has 2 replies, has 3 voices, and was last updated by
1 year ago March 13, 2023 at 7:58 am I have Cummins QSC 550 engines with a Cummins / Onan generator connected to a Vessel View Display. The vessel view display is not displaying the data from the generator, the generator page comes up when selected but there is no data i.e. Volts, HZ, Temp, etc. Once in a while the data does appear but only spiradically. Is this a bad connection in a harness or do I need to replace the Interface Module? Any tips on what connectors and pins to check…
2 RepliesMarch 15, 2023 at 6:56 pm IMO, you either have a CANbus termination issue, or the module that is producing the data output has failed… remember, it’s all a part of the complicated SmartCraft system…Last Post by:
posted: 1 year ago
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Understanding The Reprop Curve for QSM 11-715
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago March 15, 2023 at 2:17 pm All Looking for a solid answer.Ā Have been reading everything I can to understand that if your QSM is Re-propped according to the recommendation then should you or should you not be able to run at WOT or is it always a cruise below 18.6 GPH at 2000 RPM?Ā Going off this comment from another post: “…it is far from OK if you want to help prevent early exhaust manifold leaks or worseā¦ The damage to the turboās and manifolds do not happen…
1 ReplyMarch 15, 2023 at 5:26 pm IMO, WOT is for very occasional testingĀ of base line performance for a few seconds max.. The QSM11 engine is a rock solid engine platform, but the dry manifold/turboĀ system does not do it justice.Ā The same engine with a coolant cooled turbo & Manifold can run 1000 of hours a year burning 20 GPH at 1850 RPM and will give no grief. Limit,Ā by proper propping ,Ā the GPH at 2000 RPM toĀ 18-19 GPH and you’ll may get some decent life from…Last Post by:
posted: 1 year ago
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Onan Generator fuel leak
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago March 13, 2023 at 11:30 am I have an Onan 17MDKBP generator that has developed a small fuel leak. I’m trying to determine what needs to be replaced or repaired. I have traced it to the valve in the photo – you can see a ring of diesel around the shaft. The valve operates – when you turn it, fuel comes out of the opening – but when it’s closed, fuel slowly drips out.Ā I’ve looked through the diagrams and parts manual, but do not see this…
1 ReplyMarch 14, 2023 at 3:04 pm That looks like the coolant drain cock to me.Ā P/N 185-5846Last Post by:
posted: 1 year ago
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6CTA 8.3 M3 450 max rpm 2400
This topic has 3 replies, has 2 voices, and was last updated by
1 year ago March 9, 2023 at 8:32 am 2001 52 Offshore with 6cta 8.3 m3 450.Ā 31 x 31Ā Ā 3 blade factory installed props.Ā During the sea trial we could only get 2400 rpm out of each engine?Ā Ā Any suggestions as to why.Ā Ā
3 RepliesMarch 13, 2023 at 9:12 am CW, It dawned on me that I should state that we do realize that the Offshore 52 is a boat that you would mostly run at hull speed or less but has the ability to be run faster if need be.Ā I have looked at a couple Fleming55’s with Diamond 450’s.Ā The ultimate goal, if you acquire, should be to go though the entire drive train and make sure that everything is in good working order and then dial in the propellers so that you are able t…Last Post by:
posted: 1 year ago
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Coolant Loss Troubleshooting
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago
March 10, 2023 at 12:21 pm Background: Port engine currently has 959 hours on it. Approximately, 173 hour ago @ 780 hrs (1.5 seasons) my port exhaust manifold failed causing an overheat condition. (never got an alarm but the code was there).Ā The end result was having to have the head milled 17/1000ths (it was during covid and replacements parts were not available) and replacement of the heat exchanger (used part with similar hours…best available at the time).Ā Sinc…
2 RepliesMarch 11, 2023 at 3:06 pm They are QSB 5.9 425HP Really hard to get a good picture while in the boat but hopefully these get you want you need.Last Post by:
posted: 1 year ago
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Cummins 6bt wont get up to WOT after fuel line blockage
This topic has 9 replies, has 5 voices, and was last updated by
1 year ago March 3, 2023 at 8:13 pm Hi All i just got the motor (Cummins 6bt 250hp) running after a fuel blockage (massive build up of gunk in the fuel line and the primary fuel filters). I primed the system and got fuel going through, cracked the injectors and waited for the bubbles to stop. just took it out for a quick run to see how it was going and it runs smoothly and is smoking a lot less than it was! But wonāt rev past 2200 RPMĀ Any ideas?Ā
9 RepliesMarch 11, 2023 at 12:41 pm Leave the fuel fill caps off when introducing air pressure into the fuel lines. You should remove the fuel pickups and check the tubes for clogged screens, etc.Ā Any screens on fuel pickups are bad, you want the pickups to act like vacuums and allow the filtration system to get the junk and filter it out.Ā Therefore, pickups should be large diameter and very close to the bottom of the tank.Last Post by:
posted: 1 year ago
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Vibration
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago
March 9, 2023 at 4:09 pm I have a 2006 450C 5000 hours engine runs great is burns no oil and no smoke. It runs good and has be maintained.Ā It has a bad vibration or shake like something is out of balance at 1000rpms we canĀ“t pin it down. Its bad under load it does it in neutral but not bad.Ā It has a new Cummins injectors not rebuilt, new torsional damper plate, new motor mounts, New shaft aligned correct. Everything is in order. Above or below those rpmĀ“s it runs fine…
2 RepliesMarch 11, 2023 at 9:40 am Tony I won’t be back in the boat for 10 days. I am being told its a problem with the centa damper its exactly at 1000rpm The engine has always had a shake at 1000rpm.ĀLast Post by:
posted: 1 year ago
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Cummins QSB Low Battery ECM Voltage
This topic has 5 replies, has 3 voices, and was last updated by
1 year ago
March 2, 2023 at 9:46 am Pair 425 QSB’s with SC V1 and a VV4 display.Ā Ā I had an electrical problem in the boat hangar and I lost power while I was out of the country and the batteries died.Ā I have charged everythingĀ up and the batteries are fine and hold their charge and IĀ don’t see any issues but I have a persistent low ECM voltage alarm on both engines which are on separate batteries.Ā I see full voltage on both batteries and have run the boat for 6 ho…
5 RepliesMarch 9, 2023 at 8:00 am I just redid those wires to connect them directly to their starting batteries after having problems with them connected to the main DC panel.Ā The terminals are clean and show full voltage at the battery and at the terminals on the ECM with my Fluke meter.Ā I am wondering if even the batteries showing full vooltage they were damaged when they discharged.Last Post by:
posted: 1 year ago
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6CTA 8.3-M3
This topic has 8 replies, has 6 voices, and was last updated by
1 year ago February 2, 2023 at 6:43 pm In Arizona and temps may be a bit colder than I I remember last winter. Noticed both of my 6CTAs running a little rougher than usual and more white smoke than usual for longer. My boat mechanic noticed that my grid heaters werenāt hot to the touch. I later noticed that each motor had a free floating wire Iām assuming are ground wires. I purchased the boat in Los Angeles in 2021. Iāve seen on other forums that people in warmer climates run their …
8 RepliesMarch 9, 2023 at 6:07 am Learn “Tonys Tips”Ā It all there How to Deal with the Cummins Marine Air Heater CircuitLast Post by:
posted: 1 year ago
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On my Riv boat with 2 Cummins 6 BT Engines fitted engine hours readout has fade
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago
March 7, 2023 at 2:17 am On my riviera boat with Cummins BT engines fitted the digital readout for the engine hours has faded out for both engines , ant ideas how to get these backĀ thanks Ā Dave Ā Ā
2 RepliesMarch 7, 2023 at 11:36 pm Hi TonyĀ thanks the engines are Cummings B 370 bta 5.9 im not sure how to send you photosĀ although I think I have one below itās showing theengine hours are faded out this is on both gauges Iām just wondering what the problem is and how to fix itĀ tthanks DaveLast Post by:
posted: 1 year ago
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Seawater In Coolant
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago March 7, 2023 at 1:15 pm I am running a 35 Bertram with a pair of 330 6btaās.Ā <br /><br /> On the way home from our last charter I noticed the port engine running cooler thank normal. They normally run 185, and it was down about 178.Ā <br /><br /> I went down and checked the engine room, and noticed salt deposits around the lid of the coolant tank on the engine. Saltwater was leaking out around the lid. When we got home we tested it and sure enoug…
1 ReplyMarch 7, 2023 at 7:09 pm Most likely an Internal HX tube failure–Pull it and have it pressure tested at a local radiator shopLast Post by:
posted: 1 year ago
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ZF 63A with 4BT, flywheel torsion coupler issue???
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago March 1, 2023 at 8:54 pm Hello Everyone, The boat has had smoke comeĀ from the bell housing, and smell like burnt rubber twice over the last year. The first time was on the sea trial. We ran the engine up to 2700-2800 rpmās , the engine began to vibrate , smoke came from the bell housing and had the smell of burnt rubber. We brought the throttle back down and it stopped. Then this July I was running back on a trip and decided to bring the engine up to 2300rpms. Once agai…
2 RepliesMarch 5, 2023 at 7:31 pm Thank you for the advice Tony.Last Post by:
posted: 1 year ago
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Oil Analysis Results on 480CE
This topic has 5 replies, has 4 voices, and was last updated by
1 year ago
February 24, 2023 at 1:18 pm Hello all, I have been browsing this forum and am very impressed with all of the information and guidance it has provided.Ā I put in an offer on a 2003 Tiara 3800 with Cummins 6CTA 8.3 480CE engines and it was accepted contingent on Oil Analysis and Sea Trial.Ā Unfortunately never made it to sea trial as the oil analysis came back with 150 PPM Iron in the starboard engine (port is only at 5 PPM Iron as reference since I know oil analysis is used…
5 RepliesMarch 2, 2023 at 8:58 am FWIW, on my 390 MY, dropped an exhaust valve seat. Took 90 hours to do the rebuild, 28 to swap the head on the other side. All was done in the boat and did not tear up the salon to remove the engine covers. Ā The bill for the rebuild was 22K, the head swap on the other side around 10K.ĀLast Post by:
posted: 1 year ago
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Slow Starting Speed on QSM11
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