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- Cummins Marine Forum Topics
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Exhaust Type?? For Engine Off Flushing
This topic has 19 replies, has 9 voices, and was last updated by
2 years ago September 10, 2021 at 11:25 am I have a GB 2008 EU 47 with QSC 8.3 and Iām trying to figure out what type of exhaust I have so I can hopefully install an engine-off fresh water flush system. It doesnāt look like a lift muffler at all (which I know you canāt use for engine off flushing). What type is it? See any issue with engine off flushing? Itās all downhill from the raw water inlet to the exhaust, and the 3ā diameter pipe off the muffler is above waterline. The main exh…
19 RepliesSeptember 18, 2021 at 7:01 pm You are obviously on a mission. Allot not less that 25 gallon per flush. Then, you really need to “taste” what you got to be sure at a minimum..Last Post by:
posted: 2 years ago
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Fuel restriction and RPM loss.
This topic has 14 replies, has 4 voices, and was last updated by
2 years ago
August 23, 2021 at 7:01 am I have been troubleshooting a loss of WOT RPMās on both engines under load, using a borescope I followed the supply lines across the top of the tanks to where they exit the aft compartment thru the bulkhead into the ER. Both supply lines are kinked as they enter the engine room thru the bulkhead, and appear to have flattened out on the bend over the years. There is no access the area -Iām creating a work plan to replace and reroute them,it wonāt…
14 RepliesSeptember 18, 2021 at 5:14 am Easy or not, from all you have posted ( especially your last post) , would lead me to believe you need to somehow get a FULL 1/2ā³ ID line (minimum ID) all the way to the bottom of your tank Tony, to clarify 1/2ā fittings = 27/64 ID 1/2ā hose = 65/128 ID In your above equation are you allowing for ID loss on the fittings or are you saying 1/2′ minimum all the way?My latest plan if I can get it all in there would see the hose not rising ab…Last Post by:
posted: 2 years ago
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480CE High Fuel flow at Cruise
This topic has 8 replies, has 5 voices, and was last updated by
2 years ago
September 1, 2021 at 4:47 pm I just completed a survey and sea trial on a boat with twin 6CTA8.3-M (480 CE) engines. During the sea trial I had a cummins tech riding along with his laptop hooked up monitoring the engines. He said they ran good with the exception that they didn’t make full RPM. Once I got his full report, I noticed that the fuel flows during cruise were also way too high compared to the cummins power curve. Looking through Tony’s tips I learn…
8 RepliesSeptember 15, 2021 at 3:30 pm BTW, I now run 23×25 props vs. stock which were 23×27. Hope that helps!Last Post by:
posted: 2 years ago
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Oil consumption after Bosch P7100 overhouling
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago
September 14, 2021 at 2:28 am One of my Cummins 8.3 6cta 450 had a problem with Bosch P7100 pump that has been overhauled. Now the engine has an abnormal oil consumption. Could there be a reason related to the revision of the pump or is it a simple coincidence?
2 RepliesSeptember 14, 2021 at 11:08 pm Thank you for quick response Tony. Sorry but I am italian , and I live in ITALY , so I donāt know the meaning of ā coinky-dinkā ā¦. even if Google Translate suggested someting of hilarious! If you confirm the meaning of Google , I think it is better to change mechanic. I note , also , a small fuel leak.Last Post by:
posted: 2 years ago
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Valve Lash Procedure for 6CTA 8.3 430 HP
This topic has 3 replies, has 3 voices, and was last updated by
2 years ago
September 8, 2021 at 6:37 pm Hi All, Have googled and searched the forum, but can’t seem to find an answer for the procedure on valve lash adjustment. I have adjusted valve lash on many engines, so knowing where the timing pin is, plan to turn the engine over by hand until it engages. Confirm #1 is TDC (assuming most forward cylinder). I could go one cylinder at a time following the firing order, but on other engines I have had I was able to adjust several cylinders…
3 RepliesSeptember 14, 2021 at 8:58 am @tony and @bluebyu thank you for the info! I started on a FORD 390 FE on my dad’s 1974 f-250 and progressed to rebuilding my first diesel which was an international 7.3 IDI (pre-Powerstroke) with a Standyne Rotary injection pump. I worked on my first HEUI engine shortly after which was an International DT466E. The largest diesel I have worked on was a CAT 3512, it was so big it was a piece of cake to work on because everything was just…Last Post by:
posted: 2 years ago
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Qsm11m
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago September 13, 2021 at 10:25 am I just read ” Propping the Cummins Marine QSM 11 to Prevent Exhaust Issues ” To adjust the pitch to stay in the right GPH/RPM ratio, what must I do, choose the right propeller? Thank you Kind regards Christophe
1 ReplySeptember 13, 2021 at 12:51 pm https://www.sbmar.com/community/topic/qsm11-engine-inspection-for-purchase/ The net of it all…….. Have a prop shop reduce the pitch of the props to meet the spec OR yes you may need new props if you need to modify the existing props too much. The attached document is a procedural of how to create a plot of your own setup. You take that data, and your props, to a prop shop that can do the work and have a discussion with them about ho…Last Post by:
posted: 2 years ago
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QSM11 engine inspection for purchase
This topic has 10 replies, has 4 voices, and was last updated by
2 years ago August 12, 2021 at 8:31 am Hello.I am looking at a 2002 Sea Ray 48 Sedan tonight and I am trying to do some research as far as things that I should specifically look for around the engines. I am in Ontario Canada and it is very hard to find Cummins or marine technicians that know diesel marine super well. I have always done all my own maintenance and like to go the extra mile. Oil samples every year, fresh impellors etc. Any tips or list of things I should look for would…
10 RepliesSeptember 9, 2021 at 6:38 pm I don’t think it is reasonable for the Sea Ray 480, 500 or 52DB Sedan Bridge with a QSM11 670HP to tune the props enough to get 20GPH at 2100RPM.Last Post by:
posted: 2 years ago
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oil change
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago
September 8, 2021 at 4:41 am what if I forgot to change oil filter befor changing oil. Can I do it afterwards, or does that affect the amount of new oil to the engine ?
2 RepliesSeptember 8, 2021 at 12:28 pm Thank you very much for this – I have new filters and will instal them. I was afraid the oil might all leak out if I did the filter change afterwards. But as I can read from your text – there is no danger.Last Post by:
posted: 2 years ago
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Escaping gasses from exhaust manifold endcap
This topic has 1 reply, has 1 voices, and was last updated by
2 years ago
September 8, 2021 at 9:10 am Following up on my search for a resolution of my coolant problem I have determined that it appears very hot gasses continuously flow out from the exhaust manifold cap at the front end of the manifold through the “Coolant vent to Expansion Tank” line. This gas pressures coolant out of the expansion tank until it falls below the level of the vent at the radiator cap. The coolant recovery tank handles the hot coolant but once the pres…
1 ReplySeptember 8, 2021 at 10:00 am OK, found the attachment link. Please zoom in on the two coolant vent lines at the end of the X Tank. ThanksLast Post by:
posted: 2 years ago
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oil change
This topic has 2 replies, has 3 voices, and was last updated by
2 years ago September 8, 2021 at 4:55 am we have a Cummins 6BT509 Marine engine in our boat. We just changed the oil, and only got 7,5 liters on it. We had expected it to take between 12 an 14 liters. Is this normal. (We did not change the oil filter).?
2 RepliesSeptember 8, 2021 at 8:42 am I agree. Do not overfill the oil. There is a good article under Tony’s Tips here on the site regarding oil in the Cummins 6BT(A) 5.9 L engine and how much oil to put in, remarking the dipstick, etc. It sounds like you were not able to completely drain the engine. How did you “get the oil out”? Did you drain from the lowest point (drain plug) either into a container or the bilge? Did you use a “built in” oil change p…Last Post by:
posted: 2 years ago
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6BTA OVERHEATING
This topic has 2 replies, has 3 voices, and was last updated by
2 years ago September 7, 2021 at 4:20 am I have 2x 1995 6BTA engines in my 11mtr cat starboard engine suddenly started to overheat and is now constantly overheating I have checked all aftercooler heat exchanger ect all very clean and were cleaned 18 months ago I have replaced raw water pump fresh water pump thermostat sender and guage . the engine quickly gets to 210 F in gear at idle runs 200f at idle out of gear coolant full and no leaks the head was new 2 years ago ideas please tha…
2 RepliesSeptember 7, 2021 at 8:40 am I agree with Dan as it can be some kind of obstruction that is preventing proper raw water flow thru your system. You must confirm the strainer, the thru hull fitting, the actual gate valve or 1/4 turn valve for the raw water intake are FULLY CLEAR of any debris or obstruction and check the thru hull valve to make sure it operates properly and FULL OPENS… If you close every year when the boat is winterized it may not be opeing back up full…Last Post by:
posted: 2 years ago
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4bta Fuel Cooler Delete / Fresh Water Flush
This topic has 7 replies, has 4 voices, and was last updated by
2 years ago August 29, 2021 at 9:49 pm I fabricated a fuel cooler delete that incorporates a fresh water flush port. I chose post raw water pump for simplicity, no need to run engines will eliminate climbing up and down to the flybridge. The design intent is that the raw water pump will get fresh water flushed by water that seeps past the impeller. My raw water system self drains, seeping backwards past the impeller, to a level of aftercoolers about ā full. My typical usage could b…
7 RepliesSeptember 7, 2021 at 7:27 am Here’s a good read: Understanding Marine Fuel CoolersLast Post by:
posted: 2 years ago
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OIL LEAK FROM TURBO
This topic has 3 replies, has 3 voices, and was last updated by
2 years ago September 5, 2021 at 11:36 am Notice a liitle black smoke from exaust a bout a month ago , once on plane smoke would disappear. today i notice alot of oil leaking from the turbo any thoughts?
3 RepliesSeptember 5, 2021 at 4:58 pm Post good pics of all so we can “SEE” what you see. Everything————————Nothing close up ………………Stay back a few feetLast Post by:
posted: 2 years ago
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Starting Circuit Breaker Tripping
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago August 31, 2021 at 2:25 pm Hi. 6 BTA 370. CPL 2208 Always runs like a top and starts right up at first application of the key. However today after relaunch from getting some bottom work done it started up just fine and ran fine. But after I refuled at the Marina the Starboard engine would not start. No solenoid click or starter engagement. Motored out a ways on the Port eng to anchor up and look this over. Checked voltage at key switch terminals, and worked my way back…
2 RepliesSeptember 5, 2021 at 4:50 am Iām going to have to scratch my head a little further. My boat is of 1965 vintage that was repowered several times over the years and last with these 6BTAās in 2019. All of the previous engine wiring was stripped out and new harness from the on engine connection forward was replaced with new from Seaboard However the one circuit not used with the Cummins floor plan was the red wire to the key switch and the purple feed to the Fuel shutoff sole…Last Post by:
posted: 2 years ago
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Aftercooler Maintenance – Results
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago August 31, 2021 at 6:27 am Hi All Thought some may find this interesting.. I have pulled my SB aftercooler from my 6bta 330.. I was actually removing the turbo as I noticed 3 of the 4 bolts holding the riser were sheared off (another post) While removing the turbo I knew the aftercooler was overdue.. so thought why not . I have a week or 2.. so off it came. Its been 3 years since I last pulled it.. and at the time the boat was new to me 20 odd years old and i dont think t…
2 RepliesSeptember 5, 2021 at 4:28 am and as an update.. redid everything. Pressure test failed. Dropped about 1psi per hour from 25psi on the water side, so pressurised the air side (larger volume) and sealed off the water side, and it equalised the pressure, so definite leak from the core. Tested the core by itself and its a teeny tiny leak (a few teeny bubbles in dishsoap water per seccond) so may have just fractured a solder joint knocking the core out (I need to press them out…Last Post by:
posted: 2 years ago
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Cummin Onan 9MDKWB ODOR ISSUE
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago September 1, 2021 at 1:29 pm Hello All, I am having an issue with my genset. After it runs for about an hour, I get strong odor in the cabin. To me it almost smells like burning oil or coolant. I recently completed an oil change. I did not spill any oil, but nonetheless cleaned the unit and drip pan with a degreaser and bilge cleaner. At times in the season my wife is also claiming that she notices some small amounts of soot residue on the back wall of the aft c…
2 RepliesSeptember 3, 2021 at 4:30 am If the engine is venting more than it should then I would say yes that it will produce an odor. (crankcase gases) How long have you had this genset and is this a new problem? What kind of genset is it and maybe a few pics of it installed and the exhaust system it utilizesLast Post by:
posted: 2 years ago
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6BT Coolant Recovery Tank
This topic has 3 replies, has 3 voices, and was last updated by
2 years ago September 1, 2021 at 10:09 am New owner of 40 footer with Cummins 6BT engine. When purchased the coolant recovery bottle was blown out. Replace with OEM part and the bottle blew out again. Only coolant that seems to have been lost was the 1/3 in the tank when engine was cold and engine operated fine after the blowout but made a mess of engine compartment. How is the pressure relived while engine is hot and running?
3 RepliesSeptember 2, 2021 at 5:15 pm Drill a very small hole ( 1/16″-3/32″”) in the top of the plastic tank. Will hurt nothing but will say “yea or nay”, that was the issue.Last Post by:
posted: 2 years ago
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ZF Cruise Commander error codes
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago
September 1, 2021 at 6:29 am My Cummins 480CE engines are equipped with ZF Cruise Commander throttle and transmission controller. I sometimes get error codes 44 and 45. Anyone know what these codes mean.
2 RepliesSeptember 2, 2021 at 4:57 pm Yes located manual 250 pages worth. I got that error because of testing my port engine when I turn on Cruise sometimes do not get tone from unit. Already cleaned every contact and it’s improved but not perfect yet. Next I will check switch on my breaker panel. ThanksLast Post by:
posted: 2 years ago
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Aftercooler pitting
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago September 1, 2021 at 5:36 am So about to put my intercooler back together and it has the typical pitting on the internal circular face at the bottom of the body casing, it doesnt cause any issues with sealing, however I was wondering if it was worth filling the pits with a skim of JBweld or something like JB tankweld putty just to prevent condensation etc from reacting and pitting even further? Just trying to eek more years out of the housing! Steve
2 RepliesSeptember 1, 2021 at 4:29 pm Thanks Rob Shouldnt be too much of a pain if using the putty as I can smear it in.. and the tolerances there are ‘loose’ to say the least. The face that meet the core ends is fine this is about 1/2″ up from there.. and not ‘critical’ surface.. i’m just trying to prevent corrosion.. and also stop more fur growing which seems to be what jams the core in… It strikes me that these things should be coated int…Last Post by:
posted: 2 years ago
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Bosch/Cummins Injectors
This topic has 4 replies, has 3 voices, and was last updated by
2 years ago
August 29, 2021 at 4:56 pm I have a bad injector on a cummins QSB 5.9 425 (CPL 8732) and I am looking everywhere for a new injector. I cannot seem to find one anywhere and lead time have ranged from a couple of weeks to a few months. Any body have a clue where I could find one? Like a new one but I will take a Bosch reman because I am desperate part is Cummins 5263312/Bosch 0445120239 tried to get it rebuilt locally but they can’t seem to get the parts and even if…
4 RepliesSeptember 1, 2021 at 7:46 am thanks was my next option. I found them in the UK who had them in stock and funny enough even with shipping to Panama they would have been cheaper than buying from Cummins..Last Post by:
posted: 2 years ago
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Exhaust Type?? For Engine Off Flushing
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