Cummins Marine Diesel Repower Specialists Forums Cummins Marine Engines

Viewing 20 topics - 261 through 280 (of 3,772 total)
    • Cummins Marine Forum Topics
    • QSB 5.9 Operating Temp 210Ā°

      This topic has 10 replies, has 9 voices, and was last updated byDave Carlson 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…

      Started by: Ren Hoek


      10 Replies
      September 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: Dave Carlson posted: 7 months ago

    • C-series coolant system maintenance item

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 7 months ago

      September 26, 2023 at 12:00 pm While replacing the thermostats on one of my 1996 6CTAs, I decided to pull the hoses that attach to the top of the expansion tank. They connect to the top of the turbo, the exhaust manifold, and two points near the top of the engine. I believe these lines allow air to burp out of the system. Good thing I pulled them, because two of the four fittings were 100% plugged with rust. An 1/8″ drill cleared the blockages. I blew all of the hoses a…

      Started by: 1969Roamer46


      1 Reply
      September 26, 2023 at 5:10 pm Thanks for this post.. Yes, I have seen this many timesĀ  , what I call “spitters” that vent air ( actually built up molecules of combustion gases/particles/rust)Ā  from the coolant system to the expansion tank over time.. It’s from a basic lack for following coolant maintenanceĀ  every few years.. Glad you wentĀ  to the trouble to sort it out.    

      Last Post by: Tony Athens posted: 7 months ago

    • 6BTA harmonic balancer bolts loosening

      This topic has 2 replies, has 2 voices, and was last updated byAntonio Guzzo R. 7 months ago

      September 25, 2023 at 8:11 am Hello! The harmonic balancer bolts ofĀ  the 6BTA (CPL 1975) enginen keeps loosening after beingĀ tightened to the specified toque in the manual. This is happening in 3 different engines (same CPL). I think that the harmonic balancers are… out of balance and the vibration is loosenig the bolts, what do you think?

      Started by: Antonio Guzzo R.


      2 Replies
      September 26, 2023 at 10:12 am Hello Tony, The obvious bet may be the mechanic, but it was supervised personally by me, and thightened to 96 lbs. Nothing out of the ordinary, all cleaned an lubed, everything original, including the pulleys. I noticed that the belt tensioner on the engine with the loose bolts jumps a litle more than the one that did not lossened the bolts but nothing extreme.

      Last Post by: Antonio Guzzo R. posted: 7 months ago

    • 5.9 BTA low power issue

      This topic has 6 replies, has 4 voices, and was last updated byelliott womack 7 months ago

      September 18, 2023 at 10:29 pm I am trying to diagnose a low power issue. Its a 30 foot fishing boat with twin 5.9 bta’s. It was running perfectly after a rebuild or if anything port engine was little stronger after being rebuilt. But now its cant get over 2400 RPM at WOT. There is no smoke of any kind coming out the exhaust. Trying to figure it out I have taken some data readings with pressure gauges and hand held tach. Confirmed throttle lever is moving all the way to…

      Started by: elliott womack


      6 Replies
      September 25, 2023 at 1:50 pm No, no synchronizer installed on the boat

      Last Post by: elliott womack posted: 7 months ago

    • Light White Smoke Diagnosis

      This topic has 1 reply, has 2 voices, and was last updated byAntonio Guzzo R. 7 months ago

      September 15, 2023 at 11:11 am I have twin BTA 5.9 engines and the starboard side is still having an issue with white smoke. In an effort to diagnose I have: Inspected the turbos Cleaned/serviced the aftercooler New air filter Installed a rebreather kit from Seaboard Verify oil level is not high Question: What are my next steps in resolving this issue? *Note: I am seeing more soot in the exhaust discharge water of the right engine that has the smoke issue  

      Started by: Frank Ketcham


      1 Reply
      September 25, 2023 at 8:32 am The white smoke is at the dock at idle? cold? or at running speeds hot? On that list you may add a valve clearance check/adjust if itĀ“s too long since the last one.

      Last Post by: Antonio Guzzo R. posted: 7 months ago

    • Aftercooler Diagnostic

      This topic has 2 replies, has 3 voices, and was last updated byRob Schepis 7 months ago

      September 24, 2023 at 7:05 pm Is it possible to determine if a 5 yr old aftercooler has leaked raw water into the combustion side?Ā 

      Started by: Jonathan Taylor


      2 Replies
      September 25, 2023 at 6:08 am Pressure test it like this before you pull it apart if you are concerned with it’s current state.Ā  And then when you pull it apart look for salt deposits on the air side and a localized heavy corrosion area on the housing inner wall.Ā  Here’s pics of a neglected intercooler from a 6LP.

      Last Post by: Rob Schepis posted: 7 months ago

    • QSM-11 Port Engine RPM’s like WOT at start-up

      This topic has 2 replies, has 2 voices, and was last updated byTom Brady 7 months ago

      August 10, 2023 at 8:58 am QSM11’s with Glendenning EC’s. At start-upĀ  Starboard engine normal idle @600 RPM’S. Port engine RPM”s outa control, sounded like it was at WOT. Shut it down, checked throttle positions at both stations. Cranked engine again, same result. Rebooted engine power and EC controls, individually disconnected bridge and tower controls. Each start-up same results. No more tries after that. Any ideas….Ā  Thanks, Tom B  

      Started by: Tom Brady


      2 Replies
      September 24, 2023 at 3:26 am Yes, a combination of corrosion and broken wire in throttle cable connector .  

      Last Post by: Tom Brady posted: 7 months ago

    • Cummins 480 CE 6CTA. White smoke and knocking 1 2 3 4

      This topic has 77 replies, has 12 voices, and was last updated byTony Athens 7 months ago

      November 10, 2019 at 11:20 am Hey guys need some input. Think I have an idea whatā€™s 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 whatā€™s 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.Iā€™m leak…

      Started by: JJM


      77 Replies
      September 23, 2023 at 1:07 pm ???? ??????????   You need to start a new thread?

      Last Post by: Tony Athens posted: 7 months ago

    • Connecting engine info to new Raymarine Axiom Pro MFD

      This topic has 2 replies, has 2 voices, and was last updated byChuck 7 months ago

      September 20, 2023 at 3:53 pm I have installed a Raymarine Axiom Pro MFDĀ  in my 40’boat. I would like to connect my engine info to the MFD to receive tach info and other data. My has 1999 – 5.9 6bta 270 hp Cummins. How would I go about doing this?

      Started by: Chuck


      2 Replies
      September 22, 2023 at 8:59 am Byron, thank you for responding. You confirmed what I had initially thought. Now I need to get the parts gathered together to do, tach’s, coolant and oil pressure.Ā 

      Last Post by: Chuck posted: 7 months ago

    • Need help for my cummins qsb5.9 please

      This topic has 12 replies, has 5 voices, and was last updated byRob Schepis 7 months ago

      August 29, 2023 at 3:12 pm Hi,Ā  I bought a GalĆ©on 420 fly which is on Lake Geneva in Switzerland.the boat dates from 2013, 2x Cummins QSB5.9 425hp engine I want to clarify that I am almost the only boat to be equipped with cummins on our lake The engine only have 470 hours, the previous owner only sailed 2 weeks a year in Geneva elsewhere the rest of the time<br clear=”all” /> Ā  Unfortunately the engine stalls after my first outing.šŸ˜­ In full navigation a…

      Started by: John


      12 Replies
      September 20, 2023 at 2:24 pm I do not use the fuel additive and have no “real world” experience to offer. As to bleeding the air: https://www.sbmar.com/community/topic/bleeding-fuel-system-on-a-qsb-5-9/

      Last Post by: Rob Schepis posted: 7 months ago

    • QSM11 HX60 turbo outlet sealing

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 7 months ago

      August 30, 2023 at 3:46 pm My turbo housing has some corrosion at the outlet but still useable. I want to seal it with something that will minimize leakage at the riser connection. It connects with the v-band and I don’t suspect a lot of leakage but less is more here. See attached pics of exh. turbo and Deangelo riser. I will be sandblasting the flange area to clean it up. I will also need to id the source of the corrosion. I recently got the boat, a Sea Ray 480 MY …

      Started by: Brett Allred


      1 Reply
      September 18, 2023 at 7:16 pm If you find one that can seal close to red-hot imperfect matingĀ  surfaces that expand and contract all the time,Ā  I’d like to know too..Ā 

      Last Post by: Tony Athens posted: 7 months ago

    • Smart Craft VesselView 1.5 Eng Hr Problem

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 7 months ago

      August 29, 2023 at 7:42 am My Cummins is tethered to a Smart Craft VesselView 1.5 display unit.Ā  I’ve recently noticed the engine hours displayed on this unit does not accurately log when the engine is running – it sometimes doesn’t increment properly and sometimes it has even backed up several hours.Ā  I believe this is related to using the remote start button at my upper helm but this is just a guess.Ā  Any one know how to determine actual engine hours a…

      Started by: roycharrell


      1 Reply
      September 18, 2023 at 7:10 pm Welcome to Mercury Smart Crap.. Your true engine hours are accurately recorded on your engines ECM, and can be read it using INSITE or bypassing The Mercury crapĀ  and reading the base SAE J1939 electronics your ECM broadcasts.Ā  Ā Ton’s on this web site that can help.    

      Last Post by: Tony Athens posted: 7 months ago

    • Onan MDKAW oil pan leak

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 7 months ago

      August 27, 2023 at 9:33 pm Greetings… new guy here. Looks to be a great resource. My situation is that I have an assumed oil pan failure on my Onan MDKAW mounted in a Nordic Tug 42. Summarizing… The boat sprouted an oil leak when it went on the hard a couple of years ago. This ~7 mo after going on the hard.Ā  I mixed a quart of oil with some tracer UV dye and put it in thru the dipstick hole. Multiple days latency before a significant leak broke out, which too…

      Started by: Mark Adams


      1 Reply
      September 18, 2023 at 6:39 pm My personal experience it that ONAN support is not good in S. Calif. I know I cannot do much with them. Wish I had had a better answer.Ā   

      Last Post by: Tony Athens posted: 7 months ago

    • Qsb5.9 oil pression

      This topic has 3 replies, has 4 voices, and was last updated byCharles Pencinger 7 months ago

      September 17, 2023 at 1:27 pm Good morning, Port side oil pressure is about 12 @ 15% more than starboard. 3.40 vs 3.04 This has 2800 rpm https://photos.app.goo.gl/K4is4tuW14sYTQTc8 Should I control something? Tks lotĀ  JohnĀ     

      Started by: John


      3 Replies
      September 18, 2023 at 6:37 pm I also experienced this. QSB 5.9 380hp. 2650 rpm cruise,Ā  port side 43.5psi, stbd 48.1. Everything else was normal. At the time I chalked it up to a minor measurement/sensor error. BBased on what Tony said I guess it’s ok.    

      Last Post by: Charles Pencinger posted: 7 months ago

    • SMX super 27 impeller compatable with Sherwood

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 7 months ago

      August 28, 2023 at 7:06 am Hi. I have just replaced my failed Sherwood seawater pump with the SMX QSB pump. Are my spare Sherwood 2700K impellers compatible with the new SMX QSB? I see theĀ  Super 27 is compatable (and better quality) with all Cummins QSB (assuming Sherwood) seawater pumps but being cautious I just wanted to check the reverse compatability so that I don’t throw out / give away my existing spares. Many thanks. P.S. I appreciated the fast service from …

      Started by: Paul Bellefontaine


      1 Reply
      September 18, 2023 at 6:33 pm Yes, as long as your Sherwood impeller has a splineĀ  ( not a key)..

      Last Post by: Tony Athens posted: 7 months ago

    • QSM11 turbo performance issue solution

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 7 months ago

      August 25, 2023 at 4:56 am Posting this story because Iā€™ve searched the same issues and found that many have had the same issues, although never posted the solution. Ā  It seems that they figured it out and went on their way. Ā  I hope this helps someone so they donā€™t waste the time and money we did.Ā  the last few trips to the islands, our pair of 670hp QSM11ā€™s ran great, although the starboard engine lagged on run up behind the port by sometimes 800+ RPM. Ā After consulting…

      Started by: Ryan Balsinger


      1 Reply
      September 18, 2023 at 6:28 pm Glad you sorted it out–A Defective Boost sensors can cause all sorts of wield issues and post alarm codes that do not always make sense. From both past and very current experience.    

      Last Post by: Tony Athens posted: 7 months ago

    • 6BTA fuel filter change out vacuum pressure

      This topic has 9 replies, has 4 voices, and was last updated byBill Desmarais 7 months ago

      September 11, 2023 at 8:28 am Iā€™ve got a pair of 6BTAā€™s each with SMX Double Double fuel filters plus the stock on engine fuel filter. Iā€™ve had the system for about 6 years. I happened to read an article about fuel systems having too much pressure drop. The Cummins specs for my engines refer to a max dirty pressure drop of 4ā€hg. That seems very low. I donā€™t think my filter pressure drop is that low with clean filters. The gauges donā€™t go into the red until 10ā€. What is the a…

      Started by: Steve Woodward


      9 Replies
      September 18, 2023 at 5:12 pm Quantum Double/Double between the twin fuel tanks and the QSB 5.9 480. From launch of boat after repower with the QSB. Clean tanksĀ   

      Last Post by: Bill Desmarais posted: 7 months ago

    • Cummins 6BTA Holset Turbo removal

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 7 months ago

      September 15, 2023 at 3:47 pm Hello, I have a 2000 6BTA.Ā  It appears my port side turbo has a leaking oil seal.Ā  I removed the air filter and can also feel a bit of play on the air side turbine with a bit a scoring on the housing.Ā  Ā I am considering replacing just the cartridge.Ā  Is it possible to remove the cartridge in place without removing the exhaust manifold?Ā  Most if the info I see online shows the repair with the exhaust manifold off.Ā  I’d like to do in place i…

      Started by: Joel Boisselle


      1 Reply
      September 18, 2023 at 5:52 am Post a picture of this “leak”..Ā  Ā  Yes, you can remove the cartridge or draining the coolant without removing the turbo, but you may not need too.Ā  Pictures please

      Last Post by: Tony Athens posted: 7 months ago

    • When need to change Belts

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 7 months ago

      September 16, 2023 at 4:15 pm How to know when to change the belt and the seawater belt too.Ā  Also is there a way to know if the water pump is taking enough water? Tks lotĀ 

      Started by: John


      1 Reply
      September 16, 2023 at 6:21 pm What I’m I missing here? It might help if you told us what EXACT model engine you are referring to and some pics of what belts you are talking about. Ā  Ā 

      Last Post by: Tony Athens posted: 7 months ago

    • 1982 Bertram 38, 2003 Cummins 6BTA’s

      This topic has 1 reply, has 1 voices, and was last updated byZac Schramm 7 months ago

      September 16, 2023 at 3:11 pm Hi all, First off, I think we are all so lucky to have a site like this with the expertise and experience with these engines, so thank you so much. New to me 1982 Bertram 38 Convertible has Cummins 6BTA’s repowered in 2003. S/N 46315454, S/N 46315499Ā  They each have about 700 hours on them, most in the last 6 years with last owner doing a lot more use and maintainance than before. I’ve been reading the articles and some forum posts a…

      Started by: Zac Schramm


      1 Reply
      September 16, 2023 at 3:16 pm Sorry my pictures aren’t the best, the engine room access is very small so hard to get far enough away.Ā  Here are some more. I will take better ones next time there šŸ˜‰

      Last Post by: Zac Schramm posted: 7 months ago

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