- This forum has 3,964 topics, 19,412 replies, and was last updated 18 hours ago by
.
-
- Cummins Marine Forum Topics
-
-
SMX Raw water pump, Oil Bath or leak?
This topic has 3 replies, has 4 voices, and was last updated by
November 7, 2024 at 3:04 pm I was getting into a full rebuild in a 6CTA SMX Raw water pump and removed the small brass plug near the mounting flange engine side and got some oil out of it. Is this blow by from the gear side bearing or is this an oil bath for the bearings. I searched and could not find an answer. Also is there a rebuild manual or video anywhere out there. Thanks
3 RepliesNovember 15, 2024 at 7:45 pm I was helping a friend change out his Sherwood pumps for SMX ones. Where that plug is was a grease fitting. I had never seen that, but is it necessary and if so does it need to be greased. RG DodsonLast Post by:
posted: 18 hours ago
-
Cummins 480ce 2005 with original heads question
This topic has 4 replies, has 3 voices, and was last updated by
November 10, 2024 at 9:57 am Boat is a 2005 Sea Ray Sedan Bridge with the 480ce engines and the original heads and about 2000hrs. If these engines have been propped correctly do the heads still need to be replaced? Ā If it is not currently propped correctly but in the near future is propped correctly do the heads need to be replaced? See where I am going with this? Ā Boat shopping has led me to many, many uneducated owners and brokers who give me the blank stare when I ask ab…
4 RepliesNovember 14, 2024 at 6:31 pm I have a 2005 390MY with the 480s. Ā At 1400 hours without any indication I dropped a #4 cylinder exhaust valve. Ā I had removed 1ā of prop, but as I later did, it took 2ā. Ā We rebuilt the engine, new pistons, Ā turbo rebuilt, injectors and replaced the head. Ā Cummins has a TSB from 2006 addressing the valve seat material. Ā They replaced the material and issued a new head number, #4942463. The cost to do this was $22,000 which my insurance paid $18…Last Post by:
-
2004 Cummins 6BTA 700hrs Gray Smoke
This topic has 1 reply, has 2 voices, and was last updated by
1 day ago November 14, 2024 at 1:39 pm Engine starts easy and runs great, but has gray smoke at startup and doesn’t stop after warm-up. Would injectors be a good place to start? mrich
1 ReplyNovember 14, 2024 at 6:03 pm Your haveĀ a 19-20 yr old mechanical EPA Tier ZEROĀ engine and you think Grey smoke after up to temp means something is not right?———————–Maybe, maybe NOTĀ ?? You’d need to qualify / quantify what you are seeing along with a full history of past operation and maintenance of the engine for me to comment beyond this. Seaboard Founder Go here for the latest stuff we put together and share…Last Post by:
posted: 1 day ago
-
Aftercoolers
This topic has 1 reply, has 2 voices, and was last updated by
November 14, 2024 at 5:06 pm Hey guys I am getting ready to service the heat exchanger and aftercoolers on a 2002 6CTA 8.3. Do I need to drain the coolant before removing? Thanks
1 ReplyNovember 14, 2024 at 5:09 pm Heat exchanger, yes. Ā After cooler, no RG DodsonLast Post by:
-
Cummins turbo diesel 270 hp ambient operating temperature
This topic has 4 replies, has 3 voices, and was last updated by
2 days ago
November 13, 2024 at 1:28 pm Engine is in a 29ā island hopper dive boat. I am trying to determine ambient temperature when engine is running to spec a thermal actuator for fire suppression Ā in the engine compartment. Any thoughts?
4 RepliesNovember 14, 2024 at 8:58 am Thank you!Last Post by:
posted: 2 days ago
-
Descaling recommendations
This topic has 3 replies, has 2 voices, and was last updated by
2 days ago
November 3, 2024 at 4:03 pm Besides freshwater flushing after every use, is descaling/decalcification on a regular basis recommended? How often? What kind of mix? Best method to introduce mix to engine and how long to sit before freshwater flushing? Cummins 6BTA5.9-M3’s in saltwater. Thanks!
3 RepliesNovember 13, 2024 at 4:40 pm Probably about 10 years with no issues. I do my own coolers and heat exchangers. Go on YouTube and enter Rydlyme marine flush.Last Post by:
posted: 2 days ago
-
air sep removal
This topic has 10 replies, has 4 voices, and was last updated by
3 days ago
October 30, 2024 at 10:31 am Good day to all, I have a Cummins 6BTA 5.9 diamond that I want to lose the Airsep on due to what I believe to be poor performance likely for many reasons resulting in high crank pressure that is pushing oil out the dipstick. After reviewing a significant amount of information on the site I have a few install questions. My boat is a 1989 Bertram which buries the front end of the motor making access tough on a good day. The very limited access …
10 RepliesNovember 13, 2024 at 7:52 am Tony, Thanks for the confirmation. Funny not funny is that the starboard does not leak but I am sure the trap is there to some extent as I have cleaned residual oil from spots where oil is not supposed to be. As an engineer, I know many who do and those who do not think about two and three steps ahead. Some of us care some dont. And yes a good attitude adjustment would be in order. My quesion remains though as access to the front of the moto…Last Post by:
posted: 3 days ago
-
oil leak at pcv tube at air cleaner
This topic has 1 reply, has 2 voices, and was last updated by
3 days ago November 13, 2024 at 5:58 am 2011 cummings qsc 8.3 motor afterĀ 2 hr of crusing thair is oil blowing from pcv tube ,replaced pcv breatjer bu the problem still exicits,the oil psi is about 10 psi higher then the strburd side ,the problem is on the port side ///this is a 2011 c\sea ray 500 sundancer
1 ReplyNovember 13, 2024 at 6:57 am Post good pictures showingĀ the entire engine installation,Ā all and the complete history of the engine Seaboard Founder Go here for the latest stuff we put together and share for all to see:Last Post by:
posted: 3 days ago
-
New QSB 6.7 valve verses piston
This topic has 2 replies, has 3 voices, and was last updated by
3 days ago November 12, 2024 at 7:59 pm I bought a brand new boat in July that has a QSB 6.7 355 hp engine. The engine never ran properly since day 1. On initial sea trial, I was unable to achieve WOT full rpm, getting a low fuel pressure code at 1700 rpm. Cummins came and diagnosed the problem as a faulty gear pump on the high pressure pump assembly. Cummins replaced the pump assembly and I could now get close to 2800 rpm before getting the same low fuel pressure code. Cummins diagno…
2 RepliesNovember 13, 2024 at 6:54 am This is not something to sort out in this forum— GetĀ in touch with Cummins Care ( 1-800 Diesels)–document all thatĀ transpirers with names, dates etc etc . and / or seek proper legal advise.. IMO, PublicĀ forums is not the right approach Seaboard Founder Go here for the latest stuff we put together and share for all to see:Last Post by:
posted: 3 days ago
-
After Cooler O ring confusion
This topic has 4 replies, has 3 voices, and was last updated by
3 days ago November 11, 2024 at 2:13 pm Servicing the after coolers and have some confusion as to the correct rings. 425 hp, CPL 8732 Ā and ESN 46461177 Ā and 46461166. Cummins Quickserve says to use the 4019975 (fat) rings. Tony’s Tips o-ring id says if you have .070 space between the bolt hole and the edge use the skinny o-ring, 3919853. I have that gap. Any advice?
4 RepliesNovember 12, 2024 at 6:57 pm Thin o-rings–Your pics says it all————————–AS to QSOL “Parts Counter Monkeys”Ā ,Ā but theyĀ have their place ( the systemĀ itselfĀ is very good)Ā Ā ifĀ you use and understand the site correctly. Seaboard Founder Go here for the latest stuff we put together and share for all to see:Last Post by:
posted: 3 days ago
-
Power Loss / Engines will not reach full throttle under load
This topic has 5 replies, has 4 voices, and was last updated by
4 days ago
November 11, 2024 at 9:04 am Hello all, I am trying to pin down a recent problem with my 2003 Meridian 411. I’ve got twin 370 hp 6BTA’s and while trying to move the boat to prepare for Hurricane Milton I discovered that she would not plane out and had a noticeable lack of power. Only the first 1/4 of the throttle is responsive and after that, nothing really happens.Ā You can rev the engines at the dock in neutral. Earlier this year I ran the boat over 600 miles …
5 RepliesNovember 12, 2024 at 8:39 am Tony, the diver has confirmed that the intakes and props are now clean. The bottom has fresh anti-fouling, so I am confident that is not the problem. I completed the 600 mile trip in January and the boat had not left the slip until the first week of October. After reading the low power troubleshooting article, I am leaning towards aftercoolers. I am planning on removing them next time I am down at the boat to inspect. Fred, now that you m…Last Post by:
posted: 4 days ago
-
Aftercooler Core
This topic has 3 replies, has 2 voices, and was last updated by
5 days ago November 7, 2024 at 6:48 am My plan was to service the aftercooler this year. It was last done in 2019 by the previous boat owner. Some of the fins on the aftercooler are damaged if I pressure test this unit, do you think it will be OK? This thing slid right out with just hand pressure, no tools or force needed. This is off a 6bta 370hp with 1100 hrs.
3 RepliesNovember 11, 2024 at 9:19 am Whatever makes you sleep better…..Ā Nice tester.Ā I see soapy water bubbling at your air fittings.Ā Did you get that squared away and get the core to hold a solid pressure?Ā That core is the vintage of when they did the aluminum fins for a few years which was over 20 years ago.Ā The aluminum fins were more susceptible to corrosion than the more desirable copper fins.Ā If you have hi res photos at any time email them to me direct rob at sbm…Last Post by:
posted: 5 days ago
-
Just bought first diesel (Cummins) boat, blue smoke
This topic has 20 replies, has 11 voices, and was last updated by
5 days ago
December 1, 2017 at 5:19 pm Hi guys, new member and first time poster here. First I want to say thank you for this awesome web site. Just purchased my first diesel boat, a very clean 2002 410 Sea Ray Express powered by twin Cummins 6CTA8.3-M3 450 Diamonds (Serial numbers 46177147 and 46176773, CPL 8089). Engines only have 750 hours on them but 15 years of marine age. Prior maintenance records were minimal when I got the boat so I am in the process of establishing new basel…
20 RepliesNovember 10, 2024 at 6:44 pm Hi Steve, long shot here. First and foremost thanks for the detailed maintenance records. I just bought this boat and like you am doing a ton of maintenance to bring it up to spec. Did you end up replacing the elbows? They appear to be original. The boat is still super clean and thanks for installing all the āgoodiesā Ā Any help is appreciatedLast Post by:
posted: 5 days ago
-
Engine Fluttering
This topic has 1 reply, has 2 voices, and was last updated by
1 week ago November 4, 2024 at 8:57 pm Hey guys , I have 2 x 5.9 6BTs in my boat . The port side engine flutters rpm and I can hear it struggling on a cold start . Iāve gone ahead and changed all the injectors and my next step is to change the fuel transfer pump since I donāt feel any pressure on the transfer pump . Are there any more ideas you guys might have or have experienced this ? Also itās only on cold start , once it warms up the problem goes away. Once throttle I given it go…
1 ReplyNovember 9, 2024 at 10:23 am Post engine serial numbers and good pictures of the engine showing the entire engine from all sides and perspectives Seaboard Founder Go here for the latest stuff we put together and share for all to see:Last Post by:
posted: 1 week ago
-
1991 6BTA 300 high EGT
This topic has 2 replies, has 3 voices, and was last updated by
1 week ago November 5, 2024 at 9:40 am I have a 1991 Boston Whaler 31L – sport fishing/cruising boat for Great Lakes Cruising (fresh water).Ā This is powered by dual Cummins 6 BTA (300 HP). We have an issue with high EGT. When the water is calm, EGT are about 1000 and stable, but if there is 2′ of chop or more, then they will bump up to 1100 and the EGT gauge will alarm.Ā The EGT are on the exhaust side. The EGT have been this way since our purchase of this boat in 2020. …
2 RepliesNovember 9, 2024 at 10:04 am For a 40 yrs old 6BTA 5.9 CPL 970, it is very clean.. But I will point out that you have the earliest of the early versions of the welded aftercooler which I question how clean Ā is inside as to being able to remove the Ā heat from the compressed turbo air that can get to 250-300+ F Ā at higher boost pressures.Ā IMO, I consider them not really cleanable withoutĀ modifications –Like a custom removable top neck or plate.. Have you soaked…Last Post by:
posted: 1 week ago
-
Cummins 6bta 300 HP upgrade in HP
This topic has 2 replies, has 2 voices, and was last updated by
1 week ago November 6, 2024 at 8:55 pm We have just bought a 1991 Carver 4207 with twin 6bta 300 hp. It tops out at 16 kts at 2700 rpm. 2800 rpm in neutral. No excessive smoke at speed.Ā I think if we had an extra 70 hp per side it would get us on a proper plane. We cruise at 8 kts mainly but would be nice to have the power in the bank if its possible. sn#44485205 and sn#44414143. Denso 191000-6100 injection pump. Thanks Quincy
2 RepliesNovember 9, 2024 at 7:10 am I believe that you are not getting any responses because the question you have asked has been asked quite a few times before and the answer has stayed the same.Ā Yes these mods are possible but NOT worth the time, effort and money involved. You will be better served spending that time, effort and money dialing in your current setup.Ā Get a laser tach and verify that those RPM readings are accurate.Ā If they are accurate, then you are over prop&#…Last Post by:
posted: 1 week ago
-
Cummins QSB5.9 high pressure fuel pump problem
This topic has 2 replies, has 3 voices, and was last updated by
1 week ago November 5, 2024 at 4:27 pm Recently this engine started this problem,Ā tuning over and releasing the starter, not allowing the engine to start. After a few attempts, it starts. I’ll upload a video of the buzzing that the high pressure pump makes at times. One instance it started doing this right after a start attempt was made. Ok, file is too big. Anyway, it clicks twice and makes a buzzing noise, then repeats. Thanks, Roy
2 RepliesNovember 8, 2024 at 1:02 pm HP fuel pump—100% mechanical IMO, he has multiple issues, unrelated.. I’d like to see the rest of the engine–all sides and perspectives—–Start solenoid area? Seaboard Founder Go here for the latest stuff we put together and share for all to see:Last Post by:
posted: 1 week ago
-
Zinc Leak at Aftercooler QSC 8.3
This topic has 10 replies, has 8 voices, and was last updated by
November 2, 2024 at 3:17 pm I seem to have a slow raw water leak on the aft end of the aftercooler where the anode brass plug screws into what you might call the seawater manifold of the aftercooler. I’ve tried different anode plugs. I usually put the anode plug in using the appropriate torque specs (i think 22 in-lbs) but I’ve also tried going just a bit tighter, but very slow drip continues. I’ll attach a few photos. If torquing the anode down doesnR…
10 RepliesNovember 5, 2024 at 6:38 pm Iāve used teflon tape and rector seal 5, works great and checking the connectivity there is no resistance. RG DodsonLast Post by:
-
Engine cooling not working
This topic has 5 replies, has 5 voices, and was last updated by
1 week ago July 4, 2024 at 8:13 am I have a 2024 prestige yacht with dual Cummins QSB 6.7 engines. The boat is not even broken in yet with less than 200 hours. I have a yacht services company look over the boat when I am back home. Boat is in Florida and I am in Pennsylvania. During a systems check the other day, I was told that the cooling system for the engines is not pulling in any water in either engine. What could cause the stop of flow for the water intakes? The strainers w…
5 RepliesNovember 5, 2024 at 2:12 pm The addition of a “Loss of raw water alarm” might save an impeller and certainly will reduce the risk of an overheat due to closed seacocks.Ā Cheap insurane and peace of mind. main ride is a 25 Terry Jason down east, 370 6BTA CPL 2008 ZF63A gear 1.54:1 ratio, 1.75" shaft, 20X19 DQX, 5 inch exhaust pending.....27 H&H down east, QSB 5.9 480 CPL 1860, ZF280A gear 1.76:1 ratio, 1.75" shaft, anticpate 21X21 DQX, 6 inch exhaustLast Post by:
posted: 1 week ago
-
6CTA Injector pop-off
This topic has 4 replies, has 2 voices, and was last updated by
1 week ago
November 3, 2024 at 8:50 am I have a 1996 6CTA M1 that I’m rebuilding. In the process I’m testing and cleaning the injectors. Pop-off pressure on one was 3,400 psi, the other 5 were 3,700-3,800 psi. The injectors say 205 bar, which is 2,900. P/N from cummins is 3913735 and/or 3802202 The injectors are printed: Bosch KBAL P18 205 bar (937) MOJ-RĀ Ā Ā on the nozzle: 3735-300 I’m having a really hard time figuring out if these are the correct injectors for th…
4 RepliesNovember 5, 2024 at 10:29 am Casco Bay Diesel & Injector Service in Portland, MaineLast Post by:
posted: 1 week ago
-
SMX Raw water pump, Oil Bath or leak?
You must be logged in to create new topics.