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- Cummins Marine Forum Topics
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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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head oil leak ??
This topic has 7 replies, has 4 voices, and was last updated by
2 years ago
October 17, 2019 at 5:37 pm I have 2006 6ctas with 4,803 hrs in a 1978 42 chris craft sport fisherman.. salt water boat. My port motor seems to have an oil leak on the back of the motor at the bottom of the head. does not seem to be the valve cover or anything else. Is this a head leak or even possible. Am I missing something. It is not enough to cause and oil drop over a season compared to the starboard side. Oil consumption maybe 2 quarts over 100-150 hrs a season e…
7 RepliesJanuary 19, 2022 at 11:48 pm Yes it was.Ā There is a oil passage in that corner,Ā The old style gasket ( I was told) the rubber compression seal failed, maybe got hard. It was the source of the leak.ĀLast Post by:
posted: 2 years ago
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Raw Water Maintenance
This topic has 4 replies, has 4 voices, and was last updated by
2 years ago January 18, 2022 at 7:59 am I have been reviewing all the videos in preparation for a complete maintenance of the raw water side of my twin 6BTA-370 engines, including the replacement of R/W Pumps with SMX 1730’s, New Gear Coolers, Combo block /Fuel Cooler removal,Ā and After-cooler/Heat Exchanger maintenance.Ā A couple of questions that I couldn’t find on the forum: 1).Ā After-cooler Maintenance Video – What are the twin bolt specifications that were use…
4 RepliesJanuary 19, 2022 at 7:05 pm The turbo/exhaust flange bolts are 8MM, I’m thinking those aftercooler mount bolts are larger, so could by the 10MM’s….Last Post by:
posted: 2 years ago
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QSC Fuel & Oil Cooler Service
This topic has 5 replies, has 3 voices, and was last updated by
2 years ago January 17, 2022 at 11:04 am What’s involved with a service for the QSC fuel & oil cooler. I have it off the engine waiting for my aftercooler kits to arrive from Seaboard and want to clean the cooler out. Can this be placed in a 10:1 water acid tub and let soak for a few hours? This is for the fuel & oil cooler only, not the aftercooler. Thanks.
5 RepliesJanuary 19, 2022 at 10:47 am Rob, Please disregard my last post, I just saw the picture you attached. This makes sense and is doable. I’m doing this work on the boat so space is a bit limited.Ā Thanks.Last Post by:
posted: 2 years ago
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Turbo issue. Or other???
This topic has 4 replies, has 3 voices, and was last updated by
2 years ago January 18, 2022 at 7:07 pm Have a recon 6bta 370 2yrs old. Ā Removed aftercoolers for cleaning and found sludge on compressor outlet going to cooler. Ā Blades are in tact and there is no apparent play in the shaft. Ā Also, air intake side is clean and no oil is present. Ā Exhaust side is black but not full of sludge. Turbo is with a mechanic at the moment to be opened up and he is concerned that there may be another issue with it based on the amount of oil coming out. Ā Air fi…
4 RepliesJanuary 19, 2022 at 6:54 am Port & Starboard installs are not the same, especially the exhaust setup which is what Tony emphasized as to the request for photos.Ā You don’t have any engine room photos?Ā Where’s the love?Last Post by:
posted: 2 years ago
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Exhaust elbow flange condition
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago
January 16, 2022 at 7:01 am Re-powering my Cummins 6bta59 370 to exact same recon model. Original fabricator of my custom exhaust riser (15 yrs/4K hrs) tells me it is in very good condition and ok to use. I am putting on new graphite gasket and bolt kit. My question is how smooth should the face flange be that meets the turbo?
2 RepliesJanuary 18, 2022 at 9:06 am Thanks much for the response Rob. A little more than 1/4″ of meat. Thinking about grinding down to smooth surface.Last Post by:
posted: 2 years ago
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Larger Alternator for Cummins QSB 380
This topic has 9 replies, has 4 voices, and was last updated by
2 years ago
January 14, 2022 at 3:58 pm Hello We have just installed 500 ah of lithium batteries along with a Wakespeed500 external regulator. Our alternator was checked and found to be in excellent condition when shop removed the internal regulator. We are considering changing the alternator which has the small 2″ mount (19si) we believe to a Delco 24si or 28si. I have attached some pictures for clarification. SN on the QSB 380 is 46560020 The thought is we will need the j180 m…
9 RepliesJanuary 17, 2022 at 7:41 pm I have a different engineĀ the old Cummins V555Ā soĀ the 28 would have fit.Ā Ā I just didn’t need it so went with the 24.Ā Ā Now I am sort of kicking myself.Ā Ā Not hard but still I should have done some more checking.Ā Ā Ā THe max temp would have been worth it but I won’t change now unless I burn the 24.Last Post by:
posted: 2 years ago
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5.9 QSB Fuel burn
This topic has 16 replies, has 5 voices, and was last updated by
2 years ago
August 16, 2021 at 12:20 pm 2005 model Qsb 5.9 twin engines on a 23,000 pound express cruiser. I know i am asking alot for these motors but i am wondering if i might be able to lessen their load if i take a little pitch off the props. My question is how much should i take off. rpm Gph (total) 2200 25.9 2400 29.0 2500 31.5 2600 35.7 2800 38.8 WOT in neutral 3070 both engines Engine temp: Port 179/ Starboard 183 at 2500 …
16 RepliesJanuary 17, 2022 at 7:51 am Removed the props, they are stamped as 22×24. We are having a huge winter snow storm here in Ontario so i wont be able to get them to the prop shop until things are cleaned up.ĀLast Post by:
posted: 2 years ago
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Exhaust and muffler sizing
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