- This forum has 3,771 topics, 18,776 replies, and was last updated 10 hours ago by
.
-
- Cummins Marine Forum Topics
-
-
Turbo Leaking Oil
This topic has 2 replies, has 3 voices, and was last updated by
9 months ago July 28, 2023 at 9:17 am Both turbos have leaking oil and I am trying to troubleshoot. Turbo spins freely and bearings seem to be ok. See pic
2 RepliesJuly 28, 2023 at 3:40 pm Could be lots of things………Type of air intake system, CCV ststem? , overfill of oil pan, lack of proper engine room ventilation, lack of normal turbo maintenance on the air side, etc.. One thing for sure, you need to get all spic & span to find the source of the leak.. Your engine room attention needs improvement as what I see did not happen in a trip ot two.Last Post by:
posted: 9 months ago
-
4BT fuel line.
This topic has 2 replies, has 2 voices, and was last updated by
9 months ago
July 25, 2023 at 9:49 am I had a line break from the cav pump to the injector over the weekend. The parts manual shows 2 different possibilities for a fuel line: 3903523 which is 1.8mm or 3906030 which is 2.0mm my pump tag: U3042F310 17880058FDU 99L1400-9-3075
2 RepliesJuly 28, 2023 at 2:41 pm The tags have fallen off all the fuel lines. I mic’ed out the ID at 2.0mm and ordered those. Hopefully I made the right decision on that.Last Post by:
posted: 9 months ago
-
Raw Water Pump Impeller
This topic has 2 replies, has 2 voices, and was last updated by
9 months ago June 30, 2023 at 1:02 pm I am trying to find the part number for my QSC 8.3 500 diesel Raw Water Pump Impeller. I was hoping that someone out there would have this same engine and this part number. Thanks everyone.
2 RepliesJuly 28, 2023 at 1:53 pm Hi John! I forgot to thank you for your help here 3 weeks ago! I was so excited about getting the part number I forgot. Thanks again.ĀLast Post by:
posted: 9 months ago
-
Converting 6BTA to Marine
This topic has 3 replies, has 2 voices, and was last updated by
9 months ago June 2, 2023 at 11:58 am I have an old Canadian Fish Tug, with a Perkins 6.354 N/A from the late 60’s.Ā I picked up a 12V 6BTA out of a School Bus that I’d like to marinize for this old metal boat.Ā Ā Here’s my high level plan: 1.) Replace PTO air compressor and hydraulic steering pump with gear driven freshwater pump. 2.) Add Aftercooler to cooling circuit.Ā (Previously had aftercooler built into bus radiator) 3.) Add Oil Cooler 4.) Add heat exchanger …
3 RepliesJuly 27, 2023 at 6:59 pm Don’t worry about an aftercooler.. Get the engine installed and get it running /propped so it makes at least 2400-2500RPM without the coolant going above 180F ( use a 160F thermostat)..Ā Thermal wrap the exhaust & turbo Be sure your gear stays under 170F with 140-15 better Keep the engine room well ventilated so temp stay under 120F max.Last Post by:
posted: 9 months ago
-
Temperature sender
This topic has 9 replies, has 4 voices, and was last updated by
9 months ago
July 26, 2023 at 2:43 pm Iām switching back to a single helm station. I have 6bta with the older vdo Vanguard quad gauge. Ā Anyone know what sender I should be using? Iāve tried Stewart Warner 280 ea, and my gauge is reading 15 degrees to high.
9 RepliesJuly 27, 2023 at 2:41 pm Maybe if I can get it identified I can get a single station one from the maker.Last Post by:
posted: 9 months ago
-
Alternator Intermittent?
This topic has 11 replies, has 4 voices, and was last updated by
9 months ago
July 10, 2023 at 8:49 am Hi, I have a Cummins 6CTA (450 Diamond – single engine, ~2000hrs, date of remanufacture was in 2019) in my boat and I am having some alternator issues.Ā The alternator seems to run intermittently. When it runs, it’s strong, producing ~14V, but most of the time – meaning 80% of the time, it doesn’t produce any power. Confirmed with clampmeter on alternator wire, no current produced by alternatorĀ I have already identified …
11 RepliesJuly 27, 2023 at 6:03 am I figured I’d follow up on this in case anyone ever has a similar problem.Ā I replaced the alternator and it now charges batteries fine.Ā Looking for the root cause, I found the alternator to be very oily. the issue ended up being that the steering hydraulic lines are routed right above the alternator, and the lowest point on the line was directly over the alternator.Ā This spring i did some work and had to disconnect the steering lines an…Last Post by:
posted: 9 months ago
-
Torque spec for anodes?
This topic has 1 reply, has 2 voices, and was last updated by
9 months ago July 26, 2023 at 8:12 pm How much torque should I apply when installing the 6 anodes on my QSC 8.3 heat exchanger, aftercooler, and oil cooler?Ā Each anode brass cap is coated with RectorsealĀ T+2.
1 ReplyJuly 27, 2023 at 5:38 am NPT threads such as anode caps are a tapered fit so it’s about the mating of the male/female connection, not the stretching of a bolt to put it in tension as with machined threads.Ā And then add in the variables created by different pipe dopes and different metal materials of the male vs. female component.Ā Gotta do it by feel.Ā If you are afraid of overtightening use a stubby wrench or ratchet and tighten them down pretty good.Ā ĀLast Post by:
posted: 9 months ago
-
Coolant cap leaking
This topic has 2 replies, has 3 voices, and was last updated by
9 months ago May 30, 2023 at 9:24 am Hi to all!! I curently own a 6bta 370. Ā I ve been having ocasional leaking from the expansion tank cap. I have change the cap with a 15 psi pressure and changed the expansion tank to see if the problem resolves but it still drips. The coolant seems like it has some black soot. I see no oil residue nor diesel. There is no smoke or vapor coming out of the exhaust. Ive done pressure test thinking it could be a broken headgasket but no leak. I see m…
2 RepliesJuly 26, 2023 at 10:41 pm Tony, When doing a full coolant flush, do recommend using one of the fleet guard restore or restore plus cleaning solutions? Or something similar? Ā Do you have a preferred method of accomplishing this procedure? I am also running a 6BTA 370. <br />Thank youĀLast Post by:
posted: 9 months ago
-
onan 6MDKUB
This topic has 5 replies, has 4 voices, and was last updated by
9 months ago July 25, 2023 at 4:09 pm This genset starts, runs, sounds good, generates 110 for 15-16 minutes with or without load, then rpm starts to fluctuate and then dies.Ā Checked temp at the three sensors, 160.Ā Unplugged the exhaust high temp sensor, same result.Ā Any ideas on what/where to look next? Thanks!Ā
5 RepliesJuly 26, 2023 at 6:13 pm The status ofĀ theĀ Ā ON-ENGINE, LAST CHANCE FUELĀ FILTERĀ is ??Last Post by:
posted: 9 months ago
-
1998 Cummins 5.9 330hp Valve Cover Bolt Torque
This topic has 4 replies, has 4 voices, and was last updated by
9 months ago July 16, 2023 at 9:32 am Original maintenance book calls for 18 ft-lb for the cover bolt using the original obsolete 3923406 noise isolator seal. With that seal, the bolt will bottom on a shoulder as you tighten it and not crush the valve cover gasket. The replacement isolator 3935449 is much thicker, before I tighten these too much and completely crush the new valve cover gaskets, can someone please advise me on how much to tighten the cover bolt? Thank you!
4 RepliesJuly 26, 2023 at 10:03 am Perfect, thanks. Done and yes till it bottoms out which is also at 18ft lbLast Post by:
posted: 9 months ago
-
Slow Throttle Response
This topic has 2 replies, has 3 voices, and was last updated by
9 months ago
July 25, 2023 at 6:14 pm I’m looking at the purchase of a 38 foot fishing boat with a 300 hp 6CTA 8.3, approx 6500 hours. Compared to my former 34 foot boat with a 315hp 6BTA 5.9, throttle response seems quite slow, almost like the hull is severely fouled. Any thoughts on whether this is an issue, or how to decide whether it is a problem? Thanks
2 RepliesJuly 26, 2023 at 6:27 am ‘Slow’ means different things to different people. A 38 foot boat with a single 300hp engine is going to be ‘slow’ on a good day IMO, so could be totally normal.Ā With that said, if it’s billowing black smoke and takes 60 seconds to get on plane, that’s a different type of slow. How long does it take to get on plane?Ā What did it hit for WOT rpm?Last Post by:
posted: 9 months ago
-
Starter?
This topic has 1 reply, has 2 voices, and was last updated by
9 months ago July 25, 2023 at 1:45 pm If you try to start at the helm it sounds like a dead Battery on the starboard Side. Go down and try to start at the VIP Box you will get a HARD clunk clunk clunk. If you Start the port side then try the starboard side you will get a hard clunk and then it will fire up i can email VIDEOS Ā 2010 CUMMINS QSC 8.3 #73019120 WITH ZEUS PODSĀ
1 ReplyJuly 25, 2023 at 2:01 pm Sounds like a weak/dead starboard battery which is getting juice from the port engine, no?Last Post by:
posted: 9 months ago
-
QSC 8.3 aftercooler bent vanes
This topic has 1 reply, has 2 voices, and was last updated by
9 months ago July 25, 2023 at 11:18 am Hey everyone, I have twin 2005 QSC 8.3 engines on my 2005 Sabre 42 Express and Iām doing the aftercooler maintenance on them. One of the cores has some bent vanes that may have happened before or during transport home to my shop to clean. Doesnāt look that bad but wanted to know if I should just leave as is or try to do something about it. Leaving for a 3 week trip to The Broughtons Archipelago in BC Canada on 8/2/23 so hoping to get this resolv…
1 ReplyJuly 25, 2023 at 1:59 pm I would not worry about those air fins but a pressure test would probably make you sleep better. As long as the heat exchanger is clean and not starting to get a coating / clogging of the arteries you should be good to go.Last Post by:
posted: 9 months ago
-
Power loss and smoke from breather tube
This topic has 14 replies, has 3 voices, and was last updated by
9 months ago
March 24, 2022 at 12:48 pm My 1987 6BT with 2200 hours just started acting up! Seems to run ok initially with no exhaust smoke. Ā As soon as I accelerate under normal load past 2200 rpm, Ā the RPMs plummet and it starts throwing smoke out of the breather tube. Whole engine room fills up. Any thoughts?<br />what should I check first? Compression test?<br /><br />
14 RepliesJuly 25, 2023 at 8:35 am My older 6BT 5.9 engine has left the machine shop with new pistons, crank bearings and a valve job. I have not started a rebuilt diesel and need info on the specific steps of the procedure.Ā What is the best way to start up and run-in? how do I get oil pressure up for lubrication? Do I crank with no fuel until pressure is registered? Maybe loosen injectors to eliminate compression to save my battery? What about break in oil….is this a thin…Last Post by:
posted: 9 months ago
-
Fuel in water
This topic has 3 replies, has 2 voices, and was last updated by
9 months ago
July 18, 2023 at 3:57 pm Good Evening, Iām having an issue with my 2005 Cummins 480CE producing a sheen on the water that I believe is excess fuel on my port motor. This just started a few weeks ago and doesnāt dissipate when warmed up. Last year I had all the injectors replaced along with the heads, aftercoolers, and the turbos this year along with servicing the Raycors. My mechanic diagnosed a faulty injector on the number #1 cylinder (it was carboned up), and we repl…
3 RepliesJuly 25, 2023 at 7:06 am We found a second bad injector last week (dribbling fuel and not performing on the bench test) and we replaced that one as well. My mechanic and I felt for sure that this would correct the issue but the port motor was still showing fuel in the exhaust water. I checked the fuel and transmission gear coolers yesterday and they are solid (I disconnected them and the sheen is still there). We are at a loss to figure out what else could be causing th…Last Post by:
posted: 9 months ago
-
Fuel pressure
This topic has 6 replies, has 4 voices, and was last updated by
9 months ago
July 22, 2023 at 5:15 am Exiting a lock the other day, port motor died. 6CTA M2 ā97 vintage. On engine filter was almost empty and Racor filter was very low. Changed primary and on engine filters, pumped up the system, engine started up and purred as usual for a couple minutes and died again. How do I test for fuel pressure at the injector pump?Ā
6 RepliesJuly 24, 2023 at 8:40 am Be sure your fuel valves are 100% opened…..don’t ask me how I know……Last Post by:
posted: 9 months ago
-
QSB 6.7 aftercooler maintenance interval vs. 5.9
This topic has 12 replies, has 5 voices, and was last updated by
9 months ago
December 11, 2020 at 3:39 pm Any thoughts on whether there is any difference in the maintenance interval of the vertical 6.7 aftercooler, vs, the horizontal 5.9 aftercooler? In particular the maintenance Iām referring to is pulling it apart, cleaning, lubing, new prints, gaskets, etc. Thanks for your thoughts.
12 RepliesJuly 24, 2023 at 6:58 am Tony, Did you see the serial numbers?Last Post by:
posted: 9 months ago
-
EGT Gauges
This topic has 2 replies, has 3 voices, and was last updated by
9 months ago July 21, 2023 at 12:46 pm I’m planning on installing EGT gauges on my 2005 480s.Ā Most of my boating friends place the pyro in the flange, post turbo. All of my trucking friends put it pre turbo and have stated that post turbo temp isn’t that valuable.Ā One would think the most accurate EGT measurement would be as close to the exhaust valve as possible. There is a pipe plug on the top of the exhaust manifold. Other than having a broken pyro destroy the turbo,…
2 RepliesJuly 22, 2023 at 6:04 am RD, I use ours just as PWROBERT indicates.Ā I use it to see if something is changing from my base line.Ā We have the same engines.Ā Our baseline in our full cruise load, we read 750F on the port and 700F on the strbd.Ā We are in Elk Rapids MI for our summer trip and we ran 5 days in wildly varying conditions to get here but the baseline is what I compared against.Ā Our fuel burn at 2240 is 29GPH and EGT is 750/700.Ā IF I advance to 2320 our fuel…Last Post by:
posted: 9 months ago
-
2003 480 CE Leaking Turbo Water Gasket
This topic has 1 reply, has 2 voices, and was last updated by
9 months ago July 22, 2023 at 4:42 am Purchase last year a vessel with a leaking Turbo water gasket. Found that the stud was snapped in the exhaust manifold. Lower stud on the bottom where it’s very difficult to get at to even try to tighten with the motor as it is now. Did the best i could drilling in place and re-tapping the threads. New stud ended up being slightly deeper into manifold, must have drilled just a bit deeper to make some extra thread. Appeared to torque well a…
1 ReplyJuly 22, 2023 at 6:02 am Without pictures of what to are doing (or not doing). IMO it is impossible to offer any real help here. How to Repair a Leaky Turbo Gasket on a Cummins Marine QSC 8.3 Engine Changing a Turbo to Exhaust Manifold Gasket on a Cummins Mid-Range EngineLast Post by:
posted: 9 months ago
-
Stuck brass bushing in EGT port on stainless mixing elbow
This topic has 1 reply, has 2 voices, and was last updated by
9 months ago July 21, 2023 at 2:25 pm I am in the process of changing out a dead EGT type K thermocouple in a Cummins 330 hp engine exhaust elbow. Compression nut is completely loose but the thermocouple will not pull up and out of the compression fitting. Looks like there is a 1/4 NPT port on the stainless elbow, with a brass 1/4NPT – 1/8 NPT reducer bushing screwed into the port, and a made in China thermocouple using a brass 1/8 NPTcompression nut fitting. Nothing wants to …
1 ReplyJuly 22, 2023 at 4:55 am It is my understanding that EGT fittings need to be steel not brass due to high temps.Ā <br />may try an impact wrench and if it rings off then drill it out. Should go easy since it is brass. Do to exhaust build up in the tube it will probably not pull out so just need to cut or break it off and move on.Ā <br />looks like you have a welded or brazed on fitting to the turbo so just need to concentrate on the other fittings. Try and prot…Last Post by:
posted: 9 months ago
-
Turbo Leaking Oil
You must be logged in to create new topics.