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This forum contains 5,451 Topics, 25,950 Replies, and 15,514 Contributing Members.
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- Cummins Marine Forum Topics
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Issue with warning lights on Cummins 6BT
This topic has 6 replies, has 3 voices, and was last updated by
13 hours ago
January 15, 2025 at 2:57 pm I went out fishing the other day and we hit a wave that gave us a pretty good knock, that’s when I heard my alarm go off and looked at the warning lights and saw my WIF (water in fuel) light on. which I had cut the ends off of almost a year ago when I pulled my Racor to rebuild, shortly after that all my warning lights came on my low oil, low voltage, and high temp. My gauges were still reading fine but I stopped the boat to check it out a…
Started by:
in: Instrumentation & Electronics
6 RepliesJanuary 17, 2025 at 11:56 am I checked all the connections at the senders again and still had the issue so I pulled the board to clean it like you said and I noticed on the top right of that black rectangle seems almost charred and if I look at it from the side itās splitting down the middle and the far pin going into it is bent out. Which Iām no expert but I think reinforces buying a new one, but would love some inputLast Post by:
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Thoughts on wet exhaust 6b210
This topic has 4 replies, has 3 voices, and was last updated by
1 day ago January 14, 2025 at 12:03 pm Boat is an old military Willard being used as a tour boat. It originally had a dry wrapped exhaust Ā for a few feet then water was inputted right before the water box then out the boat above the water line. Over the years it fell apart. To get it going again quickly cause its in service every day we installed a wet exhaust with the stock elbow off the turbo into a Vetus exhaust hose aimed downward then back up and around into the waterbox and out…
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in: Cummins Marine Engines
4 RepliesJanuary 16, 2025 at 6:10 am 1——–Nothing off the shelf–all we do is custom to the vessels needs/measurements we have to work around with 2——ADVICE——–EverythingĀ you could possibly need is in our exhaust articles and has been for years 3–You have (and had) plenty of room to do it right Seaboard Founder Go here for the latest stuff we put together and share for all to see:Last Post by:
posted: 1 day ago
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Sherwood raw water pump identification
This topic has 3 replies, has 2 voices, and was last updated by
3 days ago
January 11, 2025 at 4:18 am Hi – Happy New year. I have twin 6BTA’s 250hp CPL 1322 I thought I had GC1 Sherwoods, but I see the GC5 is sold for the 250hp. Mine are driven by gears rather than pullies. If I were to get new, should I get the GC1 or the GC5’s?
Started by:
in: Cummins Marine Engines
3 RepliesJanuary 15, 2025 at 1:34 am Happy New Year! It sounds like you are evaluating the correct Sherwood pump model for your twin 6BTAās 250hp CPL 1322. Since your pumps are gear-driven rather than pulley-driven, compatibility is critical. The GC5 is generally sold for the 250hp, so it might be the better option if you are buying new. However, itās worth double-checking the specifications for your specific setup, as differences in configurations, like gear ratios or mounting, co…Last Post by:
posted: 3 days ago
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6BT 210 to 6BTA 260
This topic has 3 replies, has 2 voices, and was last updated by
4 days ago January 12, 2025 at 3:47 pm Looking to get a little more HP on a tour boat. I have been running the 6BT 210 recon from Cummins. I have had bad luck over last 5 years had to repower twice. Both times I have had head gasket issues and leaky injector pumps at low hours around 2K . Anyway looking into the 6BTA 260 because it has a different injector pump and a little more HP that may lessen the load. I was unsure of exhaust size differences between the 210 vs 260 and was wonde…
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3 RepliesJanuary 13, 2025 at 6:58 pm Just an FYI.. 1—–The 330/370 version are lower profile than the 260/270Ā versions (basically theĀ same as you have now) 2—-With the 370 version, it is very easy for us to limit the HP to the 250-280 HP range ( we do it allĀ the time) when a operator wants the extended RPM rangeĀ for better vessel control,Ā a quieter engine, but NOT the extra HP or fuel consumption 3—The cost of the 330/370 is actually the less or the same…Last Post by:
posted: 4 days ago
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Sea Water Monitor
This topic has 3 replies, has 4 voices, and was last updated by
4 days ago
January 10, 2025 at 3:25 pm After overheating an engine due to an impeller failing, seems to me come type on monitor system is needed. Consistant with other critical systems What do you thing of running a hose off the unused port on the pump to a pressure gauge at the helm. RG Dodson
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in: Cummins Marine Engines
3 RepliesJanuary 13, 2025 at 7:38 am Richard –Ā I have installed both a water pressure gauge and an exhaust temperature alarm.Ā My setup is detailed here: raw water alarm options I’ve settled on this approach as the most effective for monitoring and alarm.Last Post by:
posted: 4 days ago
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ZF Transmission Noise in Gear at Idle Speed
This topic has 8 replies, has 6 voices, and was last updated by
4 days ago
June 19, 2023 at 5:06 am We’ve got a 2010 Sundancer with QSB425 and ZF V-Drive transmissions, ZF 85 IV,Ā a noticeable noise started happening when in gear at idle and I’m looking for help with ideas of the cause.Ā I checked fluid levels, temps and pressures at speed and all seem to be normal and the port transmission has no noise.Ā The serial number on the unit is 30803-S.Ā I’ve got a video I’m trying to reduce file size to load, thank you in adv…
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in: Marine Transmissions
8 RepliesJanuary 13, 2025 at 5:53 am I spent significant time and effort and wish I could tell you what finally resolved the issue.Ā I changed filters, fluids, I ran borescope down to look at condition of all gears, I pulled the boat and checked prop runout.Ā Upon doing all of that after a good 30minute run when pulling throttles back the noise was gone.Ā I’ve sampled fluid multiple times before, during and since and nothing has changed or thrown a flag.Last Post by:
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SAE 3 ZF 220A Adapter Plate sweating rust?
This topic has 0 replies, has 1 voices, and was last updated by 4 days ago
January 13, 2025 at 5:43 am Hi everyone, Happy new year! Ok this is a weird one. Rebuilt 6BTA sitting in garage, covered in plastic to keep dust out and an additional drop cloth over it. The original adapter plate for the ZF 220A was completely stripped of paint and primer, wire brushed, ospho, heated with a torch to drive “moisture” out prior to new primer and two-part urethane coat. All through this process I noticed that it was weeping drops of rusty moistur…
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in: General Discussion
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Cummins 6BT / 210 gray smoke
This topic has 0 replies, has 1 voices, and was last updated by 5 days ago
January 12, 2025 at 1:30 pm 6BT 210 hp running well at 9800 hrs.Ā Recently, seeing gray smoke when the engine is warm.Ā When I get close to the exhaust, can smell diesel.Ā Ā Injectors have never been tested or replaced.Ā Are there other possible causes for the gray smoke which should be checked before pulling the injectors?
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in: Cummins Marine Engines
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Aftercooler sludge in fins? Can you confirm if itās an issue?
This topic has 2 replies, has 3 voices, and was last updated by
5 days ago
January 10, 2025 at 4:04 pm New boat this year and diesel owner. 1996 Cummins 250 6btaās. Ā Boat has been running fine doing preventative maintenance and learning all about these engines. 1. I think the problem stems from a āhighā oil level in reservoir. Ā I changed the oil used the chart. Ā I put in 13 qts and now I believe we are in the low mark on the dipstick. 2. Prior to oil change I experience oil coming out of dipstick and dipstick base. Ā Changed oil and will be inst…
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in: Cummins Marine Engines
2 RepliesJanuary 12, 2025 at 1:22 pm A turbo wash may be in order, but Iād run it for a while with the changes you made and see if it clears itself.Last Post by:
posted: 5 days ago
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Dropped a valve qsc 8.3 500
This topic has 10 replies, has 4 voices, and was last updated by
6 days ago
September 12, 2024 at 4:48 pm Just curious, are dropping valves common on the 8.3 qsc 500? Ā Iāve heard both yes and know. Ā Mine was at 1200 hours when it happened. Ā Also, Iād like to add an egt sensor to my setup. Ā Does SBMAR sell one? Ā Iāve been thinking upgrading my instrumentation as well while the motor is out for repair. Ā Iād like something that would work with the sbmar gauges
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in: Cummins Marine Engines
10 RepliesJanuary 11, 2025 at 8:23 pm Hey Tony! Thanks for checking in. Ā All is going well here in cold Maryland. The motor is out and in the rebuild shop and currently torn down to the block. Ultimately, the failure point was a failed injector at 1200 hours. Ā The injector failed and melted the piston. Ā I sent the remaining injectors out and they were found to be operating but marginally. Ā There was some black spec of algae found in the injectors as well. Ā I will note that the boat …Last Post by:
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Cummins 6CTA running hot
This topic has 2 replies, has 3 voices, and was last updated by
6 days ago
January 10, 2025 at 8:41 pm Hi all i have a Carver 530 with rebuilt Cummins 450HP Cummins 6CTAs and the port engine temp sits at 180-190 Degrees but the starboard sits at 160 all day no matter what RPMs… So i removed the thermostats on the port engine expecting to find 180degreeĀ but they are 160s and i tested them and they are opening … so i removed the water pump but it is in perfect condition with stainless steel impellors. I removed all heat exchangers and …
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in: Cummins Marine Engines
2 RepliesJanuary 11, 2025 at 6:28 am Have you verified the temps?Ā Gauges/senders could be off.Ā Get an IR thermometer & checkLast Post by:
posted: 6 days ago
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QSC-540 Discontinued?
This topic has 2 replies, has 3 voices, and was last updated by
1 week ago January 4, 2025 at 1:57 pm Hello All: I’ve searched this forum unsuccessfully this question. Why do you really think Cummins discontinued the 2600 RPM QSC-540 in new T3 or recons in favor of the higher 3000 RPM 550/600 engines? Is there a design deficiency in the 540? Will Cummins continue to support with parts, etc the QSC-540 in 2025 going forward? Thanks Jeff
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in: Cummins Marine Engines
2 RepliesJanuary 10, 2025 at 4:47 pm QSC 8.3——–100% all the changes are related to emission reasons , “economy of scale”Ā cost to manufacture and like is the past with all Cummins engines, general product improvement. 2600,Ā 2800 & 3000 RPM versions and available.Ā The 600HP version at 2800 even has a commercial rating. The 3000 RPM versions were developed to lower the torqueĀ output so ZEUS andĀ lighter duty lower cost transmissions could be used …Last Post by:
posted: 1 week ago
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Cummins 6BTA fuse size
This topic has 1 reply, has 2 voices, and was last updated by
1 week ago January 8, 2025 at 5:50 pm Whatās the size of the in line fuse (power to the instrument cluster) on a ā90 Cummins 6BTA. Mine blew and the fuse was so badly corroded I canāt tell the rating. The wiring appears to be 14 AWG, so Iām guessing 15 amps or less. Thanks,
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in: Cummins Marine Engines
1 ReplyJanuary 9, 2025 at 4:54 pm 10A is good….. Corey Schmidt | VP, Operations | Seaboard Marine, Inc.Last Post by:
posted: 1 week ago
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Hatteras 45″ 1975 hull number 565727 , stern Tube
This topic has 0 replies, has 1 voices, and was last updated by 1 week ago
January 9, 2025 at 4:19 pm Hi there I have a 1975 hatteras sportfish 45ft, hull number 565727, I want to know what diameter the Stern tuba is for mi to buy a shaft seal can you help me with that ? Regards, Charles
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in: General Discussion
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QSM11 Turbo Flange Corrosion
This topic has 1 reply, has 2 voices, and was last updated by
1 week ago January 7, 2025 at 9:14 am Is the still serviceable? Turbo to exhaust flange.1100 hours.
Started by:
in: Cummins Marine Engines
1 ReplyJanuary 9, 2025 at 7:46 am From what I little see, looks totally serviceable. You may require some proper “block”Ā sanding and / or a custom graphite gasket to properly seal your exhaust to flange connection Seaboard Founder Go here for the latest stuff we put together and share for all to see:Last Post by:
posted: 1 week ago
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6BTA- Cleaning aftercooler core
This topic has 3 replies, has 4 voices, and was last updated by
1 week ago January 6, 2025 at 5:41 pm Iām curious how you guys degrease your after cooler when servicing? I watched your service video but it doesnāt address this step. I just serviced mine, and now the core leaks seawater into the air side. I soaked in simple green, did a really light pressure wash, and scraped the gunk between the fins with a plastic putty knife and a toothpick, trying not to use steel. Not a mechanic, just making stuff up as I go. It might have been close to corr…
Started by:
in: Cummins Marine Engines
3 RepliesJanuary 7, 2025 at 7:40 am Look at these pics- 90% of the time if you see SALT between the fins. especially on the bottom end when you remove you core, the aftercooler is done and has been leaking. Plenty of pics on this website showing ways to check the core after a good cleaning /soaking is a water based cleaner degreaserĀ and then pressure washing. Before and after pics and indispensable in any job like this when you have questions Seaboard Founder Go here for t…Last Post by:
posted: 1 week ago
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Cummins 6B5.9M with 10,000 hours query
This topic has 3 replies, has 2 voices, and was last updated by
1 week ago January 4, 2025 at 7:47 pm We have a sailboat with a Cummins 6B5.9M coming up to 10,000 hours on it since going into service in 2004. It’s naturally aspirated and we don’t run it too hard since it just burns extra fuel without much extra speed after getting up to our normal cruising hull speed of 7kts on a displacement hull. We change oil every 200 hours and get it tested and have never seen any red flags over all those years. Over 200 hours we might add 2 qua…
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in: Cummins Marine Engines
3 RepliesJanuary 6, 2025 at 11:11 pm Good stuff. Rob "Luck is the residue of good design."Last Post by:
posted: 1 week ago
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1996 6BT 5.9 motor won’t idle or take rpm
This topic has 12 replies, has 4 voices, and was last updated by
1 week ago December 14, 2024 at 11:42 am New member-old boat. Ā We have a 48′ trawler with twin Cummins…both are original with less than 2,000 hours. Ā It sits on a mooring ball here in Newport, Ca and its used mostly as a barge with the best water views. Ā My job has been to keep the motors/systems operational despite it not being taken offshore for years. The engines are started every month, taken to temp, and then every few cycles they are placed in gear and taken to 1,000-…
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in: Cummins Marine Engines
12 RepliesJanuary 6, 2025 at 4:15 pm Now, do this: Also, if you remove the solenoid on the bottom of the pump, you can re-install it WITHOUT the plunger and tiny spring and now the engine is a true dieselāāNo Batteries Neededā other than to crank.. Shut it off with the other lever on the top of the pump.. Look for contamination there too Seaboard Founder Go here for the latest stuff we put together and share for all to see:Last Post by:
posted: 1 week ago
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Looking for Opinions
This topic has 2 replies, has 2 voices, and was last updated by
1 week ago
January 5, 2025 at 6:42 pm Hello all My boat Ā has a Cummins 6 BTA 5.9 270 hp. It is time to replace my Lifeline AGM GPL-4DA ( start battery) . Ā This battery at 124 pounds is a back breaker to move around. Ā Ā My initial thinking was to replace with the same, as it has worked for years, however, I recently read about a Lifeline GPL-31XT ( smaller and lighter in weight) My engine has about 775 hours, run well and starts quickly . Looking for reasons to stay the same or move…
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in: General Discussion
2 RepliesJanuary 6, 2025 at 3:59 pm Thank you for your input RobertLast Post by:
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ZF220A Gear oil Brand.
This topic has 6 replies, has 4 voices, and was last updated by
1 week ago December 22, 2024 at 8:57 am I have looked at manuals, forums, posts and attempted to understand API specs, etc, etc. The answers are ALL OVER THE PLACE. I just want to get a safe product to use. I use my boat in Southwest Florida, so I am thinking SAE 40 (but happy to use SAE 30) oil for my ZF 220A transmissions W/O trolling gears. 2 Questions: Is 40 wt. ok for where I live? Hot most of the time in SWFLA. Which specific Product/Brand should I consider?
Started by:
in: Marine Transmissions
6 RepliesJanuary 6, 2025 at 10:48 am Quick question regarding oil for ZF 220A transmissions, would LIQUI Moly marine 4T 25W-40 work?Ā Boat run in Virginia, Chesapeake bay. Have some extra 6 liter cases from a miss delivery at the marina. Thanks Mike UliaszLast Post by:
posted: 1 week ago
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Issue with warning lights on Cummins 6BT
