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- Cummins Marine Forum Topics
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Adding a 2nd alternator to a 6BTA5.9M
This topic has 7 replies, has 3 voices, and was last updated by
2 years ago
January 28, 2022 at 9:16 am I have a Cummins 6BTA5.9M with 280 HP and with an alternator of 105 amps.Ā We are currently upgrading our battery configuration to provide more battery power at anchor for an extended period of time.Ā Our currentĀ battery house bank is working very well with an ACR to regulate the power between the house bank and the starter battery for our DC system.Ā Ā We also have an inverter/charger with 2 12 volt 8D batteries that are not connected to the ho…
7 RepliesJanuary 30, 2022 at 4:19 pm Thanks Tony, for your input!!Ā We will follow your advice!Last Post by:
posted: 2 years ago
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Cummins QSB 6.7L Heat exchanger corrosion
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago January 30, 2022 at 5:53 am Good morning.Ā I have these engines in my 2015 Merdian.Ā At 450 hours and as part of annual service, which I do religiously, Cummins identified that the plastic end caps were warped and as a result the end caps were leaking.Ā This seems to be a class problem.Ā What is the fix?Ā Are there alternatives to the plastic end caps?Ā Ā At this point Cummins has taken them to the shop, cleaned out, pressure tested, and reassembled with new end caps, O rin…
1 ReplyJanuary 30, 2022 at 11:32 am The plastic caps that were designed for the QSB 6.7 HX endĀ were engineered by a “pure & simple” couch engineer. IMO, the idea was good, but!!Ā After I saw few failures, I cut one up and it was obvious what the engineerĀ was fixated on and he missed it big-time .. Cat made one that has worked out well.Ā Anyway, Cummins hasĀ replaced it by bronzeĀ units.Last Post by:
posted: 2 years ago
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Hose Connections – RectorSeal?
This topic has 4 replies, has 2 voices, and was last updated by
2 years ago January 27, 2022 at 7:24 am When connecting the fuel and oil hoses to the cooler and oil hoses to the transmission should I use RectorSeal 5? Thanks.
4 RepliesJanuary 30, 2022 at 6:32 am Thanks Rob. I’ll be careful not to get any grease on the fuel and oil seating surfaces; threads only.Last Post by:
posted: 2 years ago
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Cummins QSM11 losing hours
This topic has 8 replies, has 4 voices, and was last updated by
2 years ago January 24, 2022 at 2:58 pm 2021 Back Cove 41 with Cummins QSM11 715hp, serial number 35366228.Ā The engine data is displayed on a Raymarine Axiom display at the helm pictured below and in the engine room on the Cummins display panel.Ā Ā I log each trip including engine hours, distance, fuel, etc, from the display at the end of the trip .Ā My last trip the hours were 119.1 when I shut down.Ā Today when powering up the engine, the hours red 118.1 both on the Raymarine and th…
8 RepliesJanuary 29, 2022 at 7:06 am ‘I would guess that Steveās strange ānegativeā result was due to a significant change in boat resistance due to a different state of being on plane’Ā Change the weight in any planing boat or bottom condition,Ā and slip goes up or down accordingly…………. For out poster– removing 2″ of pitch would make those manifold turbo last noticeably longer.Last Post by:
posted: 2 years ago
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Barring tool location?
This topic has 3 replies, has 4 voices, and was last updated by
2 years ago January 27, 2022 at 1:10 pm I need to remove the harmonic balancer on my 6BTA and in order to lock up the crank I bought a barring tool.Ā The problem is, I can’t find the port to use this tool.Ā I’ve read that it’s behind/below the aftercooler, and I did find a port where I removed the cover and all I found was the smooth surface of the flywheel.Ā No teeth there so the barring tool won’t work.Ā I’m I looking in the wrong spot?
3 RepliesJanuary 28, 2022 at 3:46 pm Much easier to use a 15/16″ socket on a 1/2 Drive ratchet on the front alternator nut………………………Turn CWLast Post by:
posted: 2 years ago
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480ce, what must be done upon purchase?
This topic has 8 replies, has 4 voices, and was last updated by
2 years ago
January 22, 2022 at 10:33 pm Looking at 2004 SeaRay with the 480ce engines. Ā This particular boat has low hours, less than 500 in salt water. Ā Providing the engines reach WOT and are propped correctly to the 450 fuel burn (which I assume will require some prop tweaking) what is required in order to have a stress free ownership with these engines? Ā Can I be confident all is well given they are propped to the 450 fuel burn curve Ā or is replacing the heads absolutely necessary…
8 RepliesJanuary 26, 2022 at 7:46 pm Thanks for the thoughts. Ā Aside from the engines looking cooked and ran hard for those short 400hrs, the rest of the boat is pretty beat. Ā On to the next….Last Post by:
posted: 2 years ago
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Black Smoke Sluggish Performance
This topic has 14 replies, has 3 voices, and was last updated by
2 years ago January 6, 2022 at 1:48 pm This isn’t a “what could it be” post. I just wanted to chronicle my last few days for anyone who may need reference Ā Ā Ā Ā Back story. Christmas Eve sunset boat ride with my family and I noted the boat was sluggish on the port motor to come up to cruise. It would get there and WOT maintained it’s 3150 with no loss in speed once at cruise and above.Ā No puffy black smoke and I didn’t check the exhaust directly. I th…
14 RepliesJanuary 26, 2022 at 11:52 am Just a follow up.Ā I FINALLY got the air side back on. Needed to order a better set of snap ring pliers. Then still needed the right tool. In this case my wife. To crawl outboard of one of the motors to hold turbo housing in place. And then I did the opposite and she put on the clip ring.Ā After that the rest was smooth. I swapped the top aftercooler bolt for a stud. 100x easier to install. Then buttoned everything up. No leaks I could se…Last Post by:
posted: 2 years ago
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Exhaust and muffler sizing
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago
January 25, 2022 at 2:38 pm Just curious to know of proper muffler sizing for my 6bt 210hp Cummins motors, engines I pulled out had 4ā centek mufflers and exhaust piping. Would this size muffler be too small for what I have setup now or is the back pressure too much? Iāve read that sometimes holes are drilled in the fore and aft baffles to help with the flow. Any info is greatly appreciated.Ā
2 RepliesJanuary 26, 2022 at 9:32 am The motors that were pulled were Volvo TMD40B diesels at 124hp, they were setup with single 4ā centek mufflers downstream from the turbos about 36ā then straight out of the transom. Total system is roughly 7-8 feet long at the max. Iāll post a few photos of the old and new setups. As of now Iām running straight pipes out of the transom with a surge chambers.ĀLast Post by:
posted: 2 years ago
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No fuel to injectors
This topic has 3 replies, has 3 voices, and was last updated by
2 years ago January 25, 2022 at 12:14 pm Hi chris here Iām new to this so pls excuseĀ Ā I have a 5.9 qsb with smart craft gages . Engine wonāt start I use every day in Summer Ā not a lot winter time commercial fishing .. engine was running fine staring fine then suddenly would not start ??? I changed crank shaft sensor as a code did come up .. did t help still not starting .. changed filters and racor did see little water in racor ..so drained fuel filter out looked good clean no water …
3 RepliesJanuary 26, 2022 at 3:56 am Not sure if it a the same, but on a engine that sat for a few year.Ā Ive had the ceramic HP fuel pump plungers lock up before on a QSC if its the same pump? I don’t believe that CumminsĀ call it a serviceable part?ĀLast Post by:
posted: 2 years ago
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Cummins 6BT not starting
This topic has 9 replies, has 4 voices, and was last updated by
2 years ago January 6, 2022 at 5:28 am Hey guys Iām in need of some help from the crew of the sb community. I have just finished a repower of my 1981 topaz 28 with a pair of 2005 Cummins 6BT 5.9m motors, CPL 8206, Delphi Cav injection pumps, these are government reman engines soĀ not Brand new. The issue Iām having with one of the motors is that sheās not firing unless with a gas soaked rag over the turbo. Here are the steps Iāve taken to make sure all routes were covered: -injectors …
9 RepliesJanuary 25, 2022 at 6:53 pm Glad you stuck it out–You did good.. I’d ask the seller to “participate” if he told you something other wise..ĀLast Post by:
posted: 2 years ago
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QSC Raw Water Pipe Connections
This topic has 3 replies, has 2 voices, and was last updated by
2 years ago
January 25, 2022 at 4:47 pm I have the fuel/oil cooler off engine its leaking at the lower side of the raw water pipes. Is there anything that can be done to make a better seal when these are put back together? Also, the radiator shop I took one cooler to for pressure testing said I should replace the steel mounting bolts with stainless steel. Any thoughts on that suggestion? Thanks.
3 RepliesJanuary 25, 2022 at 6:04 pm I wouldn’t use Rectorseal but the Alco stuff has to be good given it’s used when assembling the aftercoolers. Maybe use some Rectorseal on the bolts during assembly. Ā If not that, use something though.Last Post by:
posted: 2 years ago
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Zincs -Exhaust and New Guy Questions
This topic has 7 replies, has 3 voices, and was last updated by
2 years ago January 15, 2022 at 11:36 am Hi I am a new power boater having acquired a 1999 Mainship 30 Pilot with a 6BT-5.9m 210 hp engine. I did have a 34 sailboat for 30 + years and got fairly comfortable servicing the small 3GM 30F Yanmar. At least at first glance I find the complexity and lack of room to work a bit daunting. I have 3 questions to day (the first of many !) Zincs: How many engine zincs does this engine have ? – I have read somewhere just one and I did find a l…
7 RepliesJanuary 24, 2022 at 3:23 pm Everything is very tight in the space- it sounds like I’ll just have to get in there and figure it out ! NLast Post by:
posted: 2 years ago
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Starter delayed disengagement
This topic has 4 replies, has 3 voices, and was last updated by
2 years ago
October 5, 2021 at 4:08 pm It started to get a bit sticky couple of years ago, hangs on for a second or so but recently started getting worse, last start it stayed engaged to flywheel for about 3 seconds after starting. sorry dont have a good photo of starter and attached photos the aftercooler is removed for servicing. Any advice before i start pulling things apart? Thanks in advance Mark
4 RepliesJanuary 24, 2022 at 12:48 pm Congrats on fixing it! I had a problem with my starter recently, sometimes I pushed the start button and it would not do anything but you would notice that smoke was comming from the starter cable so and starter was not doing anything. I changed the mag switch, cleaned everything and still did it one more time. I got scared of the situation and decided to just get new batteries and a brand new Delco 38mt starter to replace the old 42mt. My guess…Last Post by:
posted: 2 years ago
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Oil filter Cummins 5.9 6BTA M2 , 1989
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago January 18, 2022 at 5:10 am Hi. On engine its now BT339 (which I think is the early oilfilter LF3349) Should I go for this filter or the upgrade LF3894 ? š Ref: https://www.sbmar.com/articles/cummins-6b-qsb-oil-filters/ Regards Richard Meyer
1 ReplyJanuary 23, 2022 at 6:30 pm I would upgrade.. TonyLast Post by:
posted: 2 years ago
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New altenator battery overheating
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago
January 22, 2022 at 11:00 pm Hi just fitted a new genuine altenator to my 6bt engine no45809740. Batteries are 6 years old they have sudenly died since new altenator has been fitted. Any ideas?
1 ReplyJanuary 23, 2022 at 8:26 am Need a bit more information What kind of batteries? What do you mean by “suddenly died”? Why was the alternator replaced? What voltages are you seeing at the battery terminals when charging and when not charging? For ordinary batteries 6 years is not an exceptionally short lifetime. GeneLast Post by:
posted: 2 years ago
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6BT T stat housing & Coolant pump sealant?
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago January 16, 2022 at 9:08 am Just purchased the 160 degree T stat package from SB.Ā I will be doing work to my HX and coolant system in the spring.Ā No overheating issues, just 22 years old and a good time to change up.Ā I have a new coolant pump with O ring for the 6BT in the shop.Ā My question, what would be a good sealant to use on the metal to metal surface of the T stat housing and the coolant pump flange to the block?Ā Reto-seal, yellow or blue?Ā Or is there another p…
1 ReplyJanuary 21, 2022 at 8:02 am Yellow RECTORSEAL #5Ā Ā on everything including the bolts,ĀLast Post by:
posted: 2 years ago
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EGT Location on QSC8.3
This topic has 3 replies, has 4 voices, and was last updated by
2 years ago January 20, 2022 at 8:22 am 2010-era QSC 8.3, would like to add an EGT. I know its been discussed before but i could not find where exact location was shown.I found what looks like a convenient square bolt on an elbow right before the turbo. I’ll attach photos. I’d appreciate it if anyone could confirm this spot or based on this engine if you can recommend an alternate spot-David
3 RepliesJanuary 21, 2022 at 7:07 am Look at the picsLast Post by:
posted: 2 years ago
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Alternators burning out
This topic has 6 replies, has 4 voices, and was last updated by
2 years ago January 17, 2022 at 1:35 pm Brains Trust I am constantly burning out my stbd alternator, 3 in the last 4 years. They are Alternator Delco Type 12V 105Amp 19SI from Baxters. This is their recommended model for Cummins 6BTA 5.9 . It is connected to 2 x 12volt 280AH AGM batteries; this is stbd start batteries and house bank . All wiring is as originally fitted. I was returning from Smiths Creek after an extended stay( house batteries may have been a little low but no proble…
6 RepliesJanuary 21, 2022 at 6:57 am So, the real answer to the question I asked should be , I am not monitoring Battery Terminal voltage Trying to sort out issues like you describe begins with that, so IMO, you are driving blind regardless of whether you are asking too much of your alternator.Last Post by:
posted: 2 years ago
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6bta 315/330 very high oil pressure and possible fuel issue
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago January 12, 2022 at 7:31 pm I recently bought 2 6bta 330 engines one was in a charter boat with about 10k hrs and the other was his spare that had about 3k hrs. both engines look almost identical but only the 10k hr motor had the data plate/sticker on it.Ā I got both started up on pallets and had only a few issues of concern.Ā Ā #1 The 3k hr engine smokes (black smoke) more than the 10k hr one on start and has a way higher oil pressure. Im using a new oil filled mechanical …
1 ReplyJanuary 20, 2022 at 7:13 pm OIL Pressure–The engine with the remote oil filter will always show lower OP ( sometimes noticeably) .. If you don’t need it,Ā I’d remove the option Until the engines are up to full temps (oil included ( 180-230FĀ is normal) , IMO, ignore OP readings Hopefully,Ā you’ll clean these engines up, get rid of the things you DO NOT NEED, and go thru the entire seawater sideĀ TOP TO BOTTOM.. Can I see insideĀ the turbo exhaust ou…Last Post by:
posted: 2 years ago
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Cummins 6BTA 1989, with Startmotor Delco Remy 28MT
This topic has 5 replies, has 3 voices, and was last updated by
2 years ago
January 3, 2022 at 5:38 am Hi. I have 2 Cummins 6BTA 1989, with Startmotor Delco Remy 28MT. Now i need to hammer on one of the startmotor to make inn crank/spinn, so guess I need a new one.. Anyone know if 31MT is ok? (sn 61005265) Its also seems to have inplace startrele, so guess the old one can be removed..Ā Looks like 29MT is the new 28MT…? And 31MT is even bether?Ā Regards Richard Meyer, Norway
5 RepliesJanuary 20, 2022 at 4:38 am A little update from Norway Just got the 31mt from US, and installed it.It startet so quick that I first thought is was something wrong (was is just start engine running?? But the engine startet like a hot knife in butterĀ (minus degress and no power on throttle..)So could not be more happier (It was no start rele on the starter.. ButĀ I reused my own. Its pretty new..)So conlusion is that the Upgrade starter is awesomeĀLast Post by:
posted: 2 years ago
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Adding a 2nd alternator to a 6BTA5.9M
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