Cummins Marine Diesel Repower Specialists Forums Cummins Marine Engines

This forum contains 1,205 topic and 7,094 replies, and was last updated by  Rob Schepis 6 hours ago.

Viewing 20 topics - 1 through 20 (of 1,205 total)
    • Cummins Marine Forum Topics
    • Typical boot pressures for 6BTA 370

      This topic has 1 reply, has 2 voices, and was last updated by Rob Schepis 6 hours ago

      August 24, 2019 at 2:29 pm Just finished installing a couple of electric turbo boot gauges. At dock they both work but what are the typical pressures I should look for at various RPM’s under load when I take her out for a run?

      Started by:  pwrobert


      1 Reply
      August 24, 2019 at 6:21 pm Approx 30psi WOT and half that at cruise – several factors can effect the actual numbers… “At dock they both work” ?? What boost could you be measuring at the dock with no load? Rob "Luck is the residue of good design."

      Last Post by:  Rob Schepis posted: 6 hours ago

    • Aftercooler core possibly leaking?

      This topic has 0 replies, has 1 voices, and was last updated by Grant Robarts 11 hours ago

      August 24, 2019 at 12:51 pm I posted this over on boatdiesel, but then I remember this forum. Anyway… Got back from 3 days on the water and was able to do a thorough search through the engine room. I noticed a tiny bit of greenish water settled in some corners on top of one of the aftercoolers. (QSB550s) Searching around, I noticed what looks to be some greenish liquid sprayed from the air side of the aftercooler going to the intake. I disassembled the aftercoolers …

      Started by:  Grant Robarts


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    • Cummins 6BTA 330 Left Key On…Then had oil explosion!

      This topic has 7 replies, has 5 voices, and was last updated by Rob Schepis 14 hours ago

      August 21, 2019 at 2:30 pm New to the forum and diesel boats. I’ve always been an outboard guy. 38 Californian with twin Cummins 6BTA 330 Diamond Series. Im learning as much as I can about it. I’ve taken it out a few times and has run flawlessly. I screwed up bad on Sunday though. I left the keys on. Slipped the boat, shut the engines off from the flybridge and never went down and turned the keys off. Left it that way until the next day when I went to the boa…

      Started by:  kyleschoenthaler


      7 Replies
      August 24, 2019 at 10:23 am Sounds like you have no working audible (buzzer) alarm in the event of an alarm situation…. Rob "Luck is the residue of good design."

      Last Post by:  Rob Schepis posted: 14 hours ago

    • 2007 QSM 11 Surface Rust Valves 500 Hours

      This topic has 5 replies, has 3 voices, and was last updated by Steve Lewis 18 hours ago

      August 21, 2019 at 11:33 pm During a routine valve adjustment on both engines our mechanic found surface rust on the valves for both engines. He cleaned them both up and suggested we send the oil out for testing in 30 hours or so. Our current oil samples show clean however the previous owner had recently changed the oil (within 10 hours) so we know that probably is not a good indicator. Thoughts? Suggestions? Attachments:You must be logged in to access attached files.

      Started by:  Richard Lynch


      5 Replies
      August 24, 2019 at 6:11 am Based on the reported performance of ~30mph @ 2000rpm burning 22GPH I would probably look into having the props tuned a bit. Read the following and then my advice will make sense. The last sentence says it all https://www.sbmar.com/articles/propping-cummins-qsm11-to-prevent-exhaust-leaks/ take an inch or two out of the prop pitch and that should get your fuel burn down under the recommendation and that will extend the life of your exhaust mani…

      Last Post by:  Steve Lewis posted: 18 hours ago

    • QSM11 exhaust correction

      This topic has 4 replies, has 2 voices, and was last updated by Steve Lewis 1 day ago

      August 21, 2019 at 8:59 am Howdy folks. I did not know what to call this topci so there it is. I am well aware of the exhaust issue. I am well aware of the tell tale signs of the exhaust issue. What I want to know is how do you correct an already leaking exhaust manifold??? And what are the costs and/or difficulty of the job. My ultimate problem is I am having a hard time finding a boat that does NOT have the problem. I really like the Sea Ray 480 Sedan Bridge……

      Started by:  John Baker


      4 Replies
      August 23, 2019 at 7:42 am https://www.sbmar.com/community/topic/qsm-11-exhaust-problems-and-engine-fire/ Higher Hour engines might be a blessing in disguise. You might find that some of the nasty items have already presented themselves and been addressed. I would ask tons of questions How many times have the exhaust manifolds been replaced? How many times have the aftercoolers been serviced per the sbmar protocol How many times have the heat exchangers been serviced? H…

      Last Post by:  Steve Lewis posted: 1 day ago

    • 08 QSB’s 400 freshwater hours, aftercoolers never serviced…

      This topic has 2 replies, has 3 voices, and was last updated by Steve Lewis 1 day ago

      August 18, 2019 at 9:23 am Buddy of mine is looking at a 2008 38’ Sabre with a pair of 400 hour 380 hp QSB’s. 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 rpm’s. The …

      Started by:  Bruce Beard


      2 Replies
      August 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:  Steve Lewis posted: 1 day ago

    • Cummins 6BT Stalled and wouldn't restart when hot

      This topic has 4 replies, has 4 voices, and was last updated by Tony Athens 2 days ago

      July 16, 2019 at 10:30 am I purchased a 1979 Trojan F26 that was fitted with an older Cummins 6BT. After many blown trailer tires (trailer is in bad shape) and a failed launch attempt (prop stuff box was leaking), I finally got it in the water to place her in a slip. Motor was pumping good seawater, was a little slow to start cold, but it fired up. After leaving the dock and getting her up to 2000 RPMS there was some smoke coming from the exhaust manifold area (hard to …

      Started by:  Keith Bachand


      4 Replies
      August 22, 2019 at 5:44 pm urlLet’s see—. Zero coolant expansion tank. You expect this to work?? Next. Remove the exhaust mixer. I want to SEE inside your turbo. Tony Tony Athens Seaboard Founder Go here for the latest stuff we put together and share for all to see: https://www.sbmar.com/tonys-tips/

      Last Post by:  Tony Athens posted: 2 days ago

    • CUMMINS 450S PORT ENGINE VERY SLOW GETTING TO FULL RPM

      This topic has 1 reply, has 2 voices, and was last updated by Tony Athens 2 days ago

      August 22, 2019 at 4:31 pm Have new problem with my Tiara’s Cummins and need your help – when using boat after a week or ten days port engine reluctant to get to normal rpms. Usually, strd engine way ahead reaching cruising rpms of 2200 without delay but port engine gets stuck around 1500-1600 and it takes a few minutes to get it past it. Feels almost as if strd engine is pulling the port engine past the restriction. Curiously, after the initial run, the probl…

      Started by:  victor brunst


      1 Reply
      August 22, 2019 at 5:12 pm Tony’s Tips. On this site “Low Power Troubleshooting” Read this a few times ?? Gone thru it all ?? Step by Step ???? Tony Tony Athens Seaboard Founder Go here for the latest stuff we put together and share for all to see: https://www.sbmar.com/tonys-tips/

      Last Post by:  Tony Athens posted: 2 days ago

    • 6bta Alarm Conditions?

      This topic has 5 replies, has 4 voices, and was last updated by Rob Schepis 3 days ago

      August 6, 2019 at 5:59 am In a 2004 6bta 370 hp what all dummy alarms are there? I am getting a alarm at or near wot that I can not identify. Oil level and pressure is good Temps are good 2004 Meridian 411

      Started by:  Brad Fausett


      5 Replies
      August 21, 2019 at 5:04 am WIF sensor — It would be located in the collection bowl, you would know if you had it – a sensor screwed into the bowl with wires/harness coming out of it. Brad, not sure what definitive answer you are looking for — as to OEM engine alarms on a mechanical 6BTA it’s low oil psi and high coolant temperature, that it’s. There is the low voltage alarm at the PCB. And then anything else could have been added aftermarke…

      Last Post by:  Rob Schepis posted: 3 days ago

    • 6bta 5.9 CPL 970 won't exceed 1800 rpm 1 2

      This topic has 29 replies, has 6 voices, and was last updated by Dave Weber 3 days ago

      July 26, 2019 at 3:34 pm Hi Guys, New to forum and need some help. I’m hoping you can help me out with a problem I am experiencing with my boat engine, Cummins 6BTA 12 valve 5.9 M2 EP-9 injection pump. The problem I’m having is with the port engine which fires up without hesitation and runs great up to about 1800 rpm at this point I can continue advancing the throttle but there is zero response, this all happens under load. In the neutral position the engine…

      Started by:  Dave Weber


      29 Replies
      August 21, 2019 at 2:15 am Realizing from the previous tests that fuel delivery was not the problem but rather a restriction of air/boost to mix with the fuel. The servicing of the aftercooler no doubt helped with air flow but I decided to change the intake filter and try a less restrictive high flow performance filter. The results were positive, boost went from 5 psi to 15 and rpm increased to 2300. A big improvement but still not the 2800 that the starboard engine produ…

      Last Post by:  Dave Weber posted: 3 days ago

    • qsm11 fesh water flush

      This topic has 1 reply, has 2 voices, and was last updated by Mike Mason 4 days ago

      August 20, 2019 at 12:52 pm Do you sell a kit for setting up a fresh water flus on a dry qsm11? If not where would be the best places to enter and exit to get the most coverage. Thanks Joe Our Time

      Started by:  joe seaverns


      1 Reply
      August 20, 2019 at 10:53 pm Post up some pics. Really easy to set up. Depends on your specific set up.

      Last Post by:  Mike Mason posted: 4 days ago

    • 6bta crank case fumes

      This topic has 0 replies, has 1 voices, and was last updated by blakedales 4 days ago

      August 20, 2019 at 8:59 pm Hello, I’ve owned this boat for a couple years. She’s a harvest vessel and has been in the industry longer than I’ve been alive. Anyways, I want to fix the issue I’m having with crank case fumes. I can’t be having carbon monoxide hazards on a dive vessel. I looked on your sight and found the crank case breather kit, but it doesn’t incorporate where the fumes are coming from. The only breather I can see on my engine is in the picture …

      Started by:  blakedales


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    • Oil leak next to timing cover

      This topic has 0 replies, has 1 voices, and was last updated by Mike Schmidt 4 days ago

      August 20, 2019 at 10:56 am I tracked down an oil leak… it’s coming from the component (not sure what it’s called) that belt guard is bolted to at the vertical seam just above the lower starboard bolt, just barely above where that vertical seam meets the horizontal oil pan seam. It looks like the oil pan was installed with RTV. How can I go about fixing this leak… should I torque the lower belt guard bolts down more? Will this require removal of …

      Started by:  Mike Schmidt


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    • qsb 5.9 dry stack/keel cooled?

      This topic has 2 replies, has 3 voices, and was last updated by Scotth 4 days ago

      August 19, 2019 at 9:40 pm iv got a question for you guys, hopefully some one has gone through this or has this set up so that I can make a decision. im looking at a repower for my commercial fishing boat. currently it has twin detriot 8.2s. the boat is set up keel cooled and dry exhaust as most bay boats where designed that way back in the day. id like to keep my boat set up this way if at all possible. im interested in the qsb5.9, my question is it possible for the cumm…

      Started by:  corey a


      2 Replies
      August 20, 2019 at 10:29 am Not sure who did it, but I know there are some Shore boats in the Bay that installed the 305 HP 5.9 QSB with good results with the same setup. That is the max HP that can be keelcooled with jacket water in the aftercooler, as far as I know.

      Last Post by:  Scotth posted: 4 days ago

    • 480 QSB 6.7 High Crankcase Pressure

      This topic has 3 replies, has 2 voices, and was last updated by Corey Schmidt 4 days ago

      August 19, 2019 at 4:02 pm 2013 Meridian 441, Cummins 480 QSB 6.7, 350 hours High Crankcase alarm Technician diagnosed and concluded turbo charger fault. recommended having both turbos rebuilt. no improvement HIGH CRANKCASE PRESSURE? any leads appriciated George

      Started by:  George


      3 Replies
      August 20, 2019 at 8:15 am I can only help you if you provide me the exact Cummins fault code number. I have seen the sensor go out on these engines before but it could also be something else… a fault code will help direct us initially. https://www.sbmar.com/wp-content/uploads/2015/12/cummins-marine-qsb-6.7-crankcase-pressure-sensor-location.png Corey Schmidt | VP, Operations | Seaboard Marine, Inc.

      Last Post by:  Corey Schmidt posted: 4 days ago

    • CMD 2.8 Fuel consumption j1939

      This topic has 1 reply, has 2 voices, and was last updated by Corey Schmidt 5 days ago

      August 17, 2019 at 7:59 am Hi all I have 2 Cummins Mercruiser CMD 2, 8ES (2006) in my boat. They don’t have smartcraft. Can I export fuel consumption etc. be exported from j1939 via a converter to NMEA2000? Kind regards Peter phk Attachments:You must be logged in to access attached files.

      Started by:  Peter Øvad Halkjær


      1 Reply
      August 19, 2019 at 8:29 pm If you have junction boxes up at the dash, you can use a SmartCraft NMEA gateway to export your engine related data to NMEA 2000. Corey Schmidt | VP, Operations | Seaboard Marine, Inc.

      Last Post by:  Corey Schmidt posted: 5 days ago

    • Delphi Injection Pump Timing 6bt

      This topic has 2 replies, has 2 voices, and was last updated by john 5 days ago

      August 16, 2019 at 12:35 pm Where can I find (Buy) the procedure/manual to time the delphi injection pump to a disturbed engine? The engine was moved after the pump was removed ,doph . Mike

      Started by:  Michael Starr


      2 Replies
      August 19, 2019 at 8:03 am The weird part is it lost its prime overnight. Never seen that before. Hopefully it’s done now.

      Last Post by:  john posted: 5 days ago

    • Lost speed after Prop scan

      This topic has 0 replies, has 1 voices, and was last updated by Dan 5 days ago

      August 19, 2019 at 7:17 am Good morning guys. I have a Sea Ray 420 Sundancer with 6CTA 8.3-M3. I hit a log and got some vibration in the port prop. Pulled the boat and took both props in for scanning and repair. Prior to the log my max rpm is 2,650. I cruise at 2,150 and gps says speed is 23.5 knots. Props are 22×24…both were out and after scanning pitch calculated out at a little over 24. Now that they were both brought back to 24 my max rpm is still 2,650 a…

      Started by:  Dan


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    • flushing 450 cummins with barnacle buster

      This topic has 2 replies, has 2 voices, and was last updated by victor brunst 6 days ago

      August 16, 2019 at 8:38 am Have a 2004 Tiara 3600 Sovran with twin 450 Cummins. New to marine diesels and doing this maintenance for first time.Trying to flush engines with Barnacle Buster by pumping solution thru heat exchanger and return thru raw water pump connection. All works well water returning from water pump connection but slowly escaping somewhere else. No evidence of leaks or water in the bilge. Have not plugged/isolated water supply to shaft dripless bearings…

      Started by:  victor brunst


      2 Replies
      August 18, 2019 at 6:53 am Thanks again John! Pinched the hose to the bearings and it stopped the leak. victor vb

      Last Post by:  victor brunst posted: 6 days ago

    • EnviroVent CCV Kit 6BTA Blowby Question

      This topic has 3 replies, has 3 voices, and was last updated by Rob Schepis 1 week ago

      August 13, 2019 at 10:16 am I have purchased two kits for my 6BTA5.9M4 on a Bayliner 4788. The Port engine forward plug is accessible, however the Starboard engine has a Filter assembly bolted where the filter will angle next to the Coolant tank. where can i relocate this to. Also the kit has the bottle connected to the inlet ot the T fitting not the middle? I would have hoped for some basic directions included. Any suggestions?

      Started by:  Charles Matthews


      3 Replies
      August 17, 2019 at 12:32 pm The bracket Tony references may not be on the site at this time that is why he is referring you to reach out to Brendan directly. Rob "Luck is the residue of good design."

      Last Post by:  Rob Schepis posted: 1 week ago

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