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- Cummins Marine Forum Topics
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6BTA 5.9 coolant drain procedure
This topic has 6 replies, has 6 voices, and was last updated by
1 year ago
March 12, 2019 at 9:13 am Hi, Relatively new to diesel maintenance so please forgive me if this question is a little basic for this forum. The water heater on our boat is leaking and I’ve ordered a new unit. Before beginning the replacement I want to make sure that I understand the procedure for properly draining the coolant and replacing it so as to avoid air pockets. I know that I could probably avoid draining all of the coolant but since I do not know when the…
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in: Cummins Marine Engines
6 RepliesMay 26, 2022 at 8:24 am I will mention what I did when I first got my engine many years ago. See attachement.Last Post by:
posted: 1 year ago
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Prop speed, worth doing?
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This topic has 28 replies, has 16 voices, and was last updated by
2 years ago March 1, 2019 at 12:30 pm Thinking of trying some new ACME props and wondering while Iām at it if I should put prop speed on the running gear. Has anyone had experience with this product?
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in: General Discussion
March 7, 2022 at 1:22 pm I’ve had good results with prop-speed.Ā Basically extended cleaning the running gear for 12 months and not having to pull the boat last season.Ā Ā Prop-speed applied May, 2020 No running gear cleaned in 2020 1st cleaning Labor day weekend 2021 (had lost 2 knots), one side was fine the other had a barnacle strikeĀ Had diver clean running gear again in Nov B4 the water got to cold as a pre-cautionĀ Once its scape it’s lost it’s ef…
28 Replies
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posted: 2 years ago
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Oil Change
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This topic has 28 replies, has 14 voices, and was last updated by
3 years ago April 17, 2019 at 11:00 am Hello All, I would like to start performing my own oil changes. I am at the 75 hour mark since the last change. Engines: Cummins 6BTA 5.9 330hp @ 2800 Hours: 1,051 for each engine I have been trying to identify a step by step process for the oil change protocol, but have not had any luck. For example, what hardware are you using to extract the oil? I have located various oil change kits on West Marine and Amazon etc…, but I wanted to s…
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in: Cummins Marine Engines
December 27, 2020 at 6:31 am Manifold block can be found at McMaster Carr. Parker hose is not really necessary but I believe in fabricating for the long haul and peace of mind, not just something to get by. I too remove the fuse when not in use, just a little insurance. Sorry so long in replying, just today found that notifications of postings have been going to junk mail. 28 Replies
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posted: 3 years ago
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Home heating oil versus marine diesel
This topic has 5 replies, has 4 voices, and was last updated by
4 years ago March 30, 2020 at 10:30 am Hello new member here. I hope everybody is doing well with all the craziness going on involving this virus. I am completely new to the Diesel world and just recently purchased my first after many outboards. 2004 Tiara 3500 twin Cummins 6bta 370 hp. I have a ton to still learn but I want to thank the Sbar community for the wealth of knowledge I have learned online over the past few months. I know this topic has been probably discussed before but …
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in: Cummins Marine Engines
5 RepliesApril 5, 2020 at 6:40 pm I know direct marine fuel was having some issues. May be out of the game. Things are very strange right now. Either way put Vacuum gauges on your filters. Just as important as the gauges at your helm. Plenty of information on that here.Last Post by:
posted: 4 years ago
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6BT5.9-M Won't Start
This topic has 9 replies, has 4 voices, and was last updated by
4 years ago September 16, 2019 at 4:24 pm Good evening, All. Thanks for such a great site and for all of the info. I have spent many hours researching here since we purchased our first diesel just over a year ago. I learned what I needed to winterize everything last fall as well as much about diesel engines in general. Boat info: 2001 Mainship Pilot 30 Hardtop (1) 6BT5.9-M, manufacturer date 7/7/2000 600 hours, she had about 560 on her when we purchased last August Engine serial number …
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in: Cummins Marine Engines
9 RepliesOctober 7, 2019 at 11:23 am Eric, I hope you having more luck keeping your 6BT running. I high recommend installing a permanent vacuum gauge. I had a similar issue to you this season and like you my boat has fairly low hours which essentially means your not polishing your fuel enough. These engines pump a ton more fuel though the return than they use so they are always cleaning the fuel. This was my first full season and had no issues till I ran the boat in a 3′ to …Last Post by:
posted: 4 years ago
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Fuel Cooler Removal on 6BTA 5.9 M3
This topic has 15 replies, has 6 voices, and was last updated by
4 years ago July 31, 2019 at 10:34 am I just purchased the Seaboard Marine Fuel Cooler removal kit and found that there is a conflict/interference that does not allow me to install the fittings provided for the fuel supply. There is a banjo fittings from the starboard mounted fuel filter to the fuel injector that interferes with the new fitting installation. Is there a fix or different combination of fittings that will allow me to install the kit? Thank you.
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in: Cummins Marine Engines
15 RepliesAugust 12, 2019 at 7:56 am Douglas wrote: The new routing of the fuel supply line I HAVE ACCESS to the impeller with no interferences. Sorry for the confusion. I fixed the typo in your last post.Last Post by:
posted: 4 years ago
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Fresh water flush design
This topic has 7 replies, has 4 voices, and was last updated by
4 years ago
July 29, 2019 at 2:30 pm I’m considering how to install a fresh water flush system on my boat to both flush the system, as well as help winterize. I made up a draft diagram – are there any obvious errors? Some details: Designed so I can simply attach the fresh water hose and run the engines to flush. Engines would be flushed regularly; AC included mainly for winterization purposes. Want to flush 3 systems: Main engine (QSB 6.7 480), Cummins Onan 7.5 kWh G…
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in: General Discussion
7 RepliesAugust 1, 2019 at 8:29 am Hi Brad I remember seeing one on youtube a guy did on a 6bta, really neat but simple design. Just search 6bta fresh water flush and you should see it. If I recall correctly he removed a plug on the sea water pump and piped up his inlet with valve in to the pump. Good LuckLast Post by:
posted: 4 years ago
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Fresh water flush, 6bta
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This topic has 23 replies, has 11 voices, and was last updated by
4 years ago September 10, 2018 at 10:14 am Any reason why I couldn’t install a fresh water flush input at the bung on the SMX water pump. I seems to me that this would allow the fresh water (engine is off) to circulate past the impeller, through the entire system, and then down the exhaust. I do have the right elevations so that the exit water wouldn’t back up the wrong direction…
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in: Cummins Marine Engines
July 23, 2019 at 3:11 pm Frank wrote: Would not just closing off the raw water sea cock opening up the strainer and putting a fresh water hose from the dock and running the engine for 5 or 10 minutes do it? Frank that certainly does work if you have good strainer access with a garden hose. 23 Replies
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posted: 4 years ago
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Is fresh water flushing worthwhile?
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This topic has 55 replies, has 22 voices, and was last updated by
4 years ago January 19, 2017 at 8:08 am Years ago, following Tony’s recommendation, I hooked up fresh water flush fittings to my engine’s strainer and started flushing religiously. Within less than a year I noticed that the engine zincs were holding up much better; in fact after three years they are still going strong. I also believed that I was reducing corrosion on my raw water metal components, particularly the after cooler. Tony has implied that you can double the inte…
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in: General Discussion
July 18, 2019 at 6:33 am Leander Landrum wrote: Hi all, first post. Apologies for reviving an old thread, but Iāve tried multiple searches and cannot find the Tonyās Tips article on fresh water flushing. Itās referenced in the āmarine ageā article but no link and I have had zero luck finding it. Are you looking for a “how-to” ? There is no such instruction as one size does not fit all. Many many variables with some of the key components being your seawa… 55 Replies
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posted: 4 years ago
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New boat, new to diesels
This topic has 19 replies, has 7 voices, and was last updated by
4 years ago April 17, 2019 at 12:16 pm Hi all, I’ve put in an offer on a new boat and am getting ready to see it for the first time. Coming from a freshwater cooled Mercruiser outdrive setup, the transition to a straight shaft diesel is quite a change. I’ve been doing some research but still feel very much the newbie. What kinds of things should I look for upon my initial viewing of the boat? Assuming all goes well, what kinds of things are important that I should do re…
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in: General Discussion
19 RepliesJuly 1, 2019 at 7:58 am Tony, I defer to your expertise. I can say that the oil has just been changed. The sea trial was performed on commission so it had not been run. There was almost zero time on the new oil. The boat had not been idled dockside on the changed oil. It was at near idle speed for 10-15 minutes each way in a no-wake zone to and from the sea trial area. During the sea trial the engine was at temp and run at a variety of speeds for about 30 minute…Last Post by:
posted: 4 years ago
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Racor filter model for a 6BTA 370
This topic has 10 replies, has 4 voices, and was last updated by
4 years ago May 21, 2019 at 10:10 am I am helping a friend move a boat he has just bought from Baltimore to LI. The boat has no spares onboard so we wanted to get everything before we went down to it. Can anyone tell me what model Racor filter is used for the Cummins 6BTA 370? David
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10 RepliesMay 26, 2019 at 7:21 am The 6BTA 370s in my former 31 Blackfin had Racor 900s. 10 mic filters used, never a problem. The 6BTA 370 in my lobster boat has a single FS1000 with an SMX filter head with squeeze bulb setup.Last Post by:
posted: 4 years ago
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Envirovent install- help
This topic has 10 replies, has 4 voices, and was last updated by
5 years ago April 20, 2019 at 3:55 pm Hi guys, 6bta Cummins, i am installing Envirovent to stop my air breathers from puking oil… see the amount of oil that poured out upon removing air filter. Not sure how these engines were breathing. The walker sep had a small oil line On the very back, i believe it is an oil line draining back into the oil pan through a small filter. This kit came with no instructions. Just parts, I never like to see that but it seems pretty self expla…
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in: General Discussion
10 RepliesMay 14, 2019 at 11:25 am It’s a few weeks late but maybe someone looking for the information may come across it. The plug size to remove the entire drain back line is 9/16 SAE or know as a -6 ORB plug. I bought one from my local hose and clamp shop but you can find them on Amazon or Ebay. Remove the line when you do an oil change and pan is empty. Asking for a -6 ORB plug is probably the simplest way to describe it.Last Post by:
posted: 5 years ago
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Distribution block removal – oil sensors
This topic has 5 replies, has 4 voices, and was last updated by
5 years ago May 13, 2019 at 11:05 am I want to remove my oil/fuel distribution block from a 6BTA, but I have 2 oil sensors… I think one would be referred to as a oil sensor and the other an oil sender? Anyway, I guess it doesn’t matter what they are, but how can I go about removing the distribution block and then adequately reinstalling both of these sensors with a decent way to attach to the motor that would be better than the distribution block?
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5 RepliesMay 14, 2019 at 10:53 am That works Brian as to leaving the oil connections but eliminating the fuel connections because it’s the fuel leak that are the real PITA with the block.Last Post by:
posted: 5 years ago
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Prop load vs fuel burn vs overloaded.
This topic has 5 replies, has 4 voices, and was last updated by
5 years ago April 30, 2019 at 11:37 am I was rereading props move boats engines just turn them. I understand itās possible to load an engine rated at say 500 HP @ 2800 WOT rpm to produce 500 HP at say 2000 WOT RPM (overpropped) and the fuel burn in both cases should be the same as published on the manufacturers charts, correct? There is damage being done even if the engine is maintaining a proper temperature, I get that. Iām trying to understand what actually is damaging the engine…
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in: General Discussion
5 RepliesMay 3, 2019 at 9:25 am Anybody ever here of this company and itās fuel flow options? https://shop.interactio.co/collections/frontpage/products/4-optio-fuel-wireless-flow-sensors-twin-diesel-bundleLast Post by:
posted: 5 years ago
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Oil Drain Hoses
This topic has 3 replies, has 3 voices, and was last updated by
5 years ago April 9, 2019 at 8:59 pm Hey Guys, Just read my insurance and value survey and one recommendation is to replace my “blue” engine oil drain lines. I have a 1996 6bta5.9 250 HP engines, seems odd that this was suggested. The hoses look fine to me, has anyone had these hoses fail from engine heat? If I do go ahead and replace, are they simply hydraulic lines? Tony, I see you sell two types but none for my model, is this something I could fabricate locally? T…
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in: Cummins Marine Engines
3 RepliesApril 10, 2019 at 7:30 pm How recent was the survey? I would expect the surveyor to give you a verbal run down of any issue post inspection. Maybe you should call him for clarification.Last Post by:
posted: 5 years ago
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Interesting finds
This topic has 2 replies, has 3 voices, and was last updated by
5 years ago April 4, 2019 at 6:55 am First, I want to say thanks to the SBMar team for their help as I’m going through completing a significant number of maintenance items while the boat is laid up for the winter. Nearing the end of the project, but had a couple interesting finds along the way. The boat is a 2007 Sea Ray Sundancer with QSB5.9 425 motors. Approximately 1300 hours on the mains, the last 200 of which have been on a freshwater lake. Prior to that the boat was kep…
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in: Cummins Marine Engines
2 RepliesApril 4, 2019 at 5:55 pm Wow. That’s quite restriction. Thanks for sharing.Last Post by:
posted: 5 years ago
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Coolant Drain Plug Size
This topic has 2 replies, has 2 voices, and was last updated by
5 years ago
April 2, 2019 at 8:07 am What is the coolant drain plug size on a 370B? It looks to be a 1/4″ or 1/8″ NPT. I want to install a small drain valve to make coolant draining easier, especially on the starboard engine where I have limited access. Thanks! Philip
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in: Cummins Marine Engines
2 RepliesApril 2, 2019 at 9:40 am Thanks Brian! PhilipLast Post by:
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Oil pan plug
This topic has 7 replies, has 3 voices, and was last updated by
5 years ago March 11, 2019 at 6:20 pm Good evening fellas, In the process removing old airseps and installing my new Envirovents on my 330 Diamonds. I’m going to remove the drain back hoses to the pans and need to plug the aft most drain bung in the pan. Looks to be M18x1.5 from the Cummins part diagram. Can anyone confirm that? The coolant plug is npt as well as the combiner block(which is next to go.) I guess it’s just a mixed bag of fasteners. On a side note cleaned …
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in: Cummins Marine Engines
7 RepliesMarch 14, 2019 at 11:41 am That’s what I was thinking too. Access to that plug is difficult in my setup, so I may just stick a bolt in the walker hose and clamp it.Last Post by:
posted: 5 years ago
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Head Gasket Leak 6bta
This topic has 11 replies, has 5 voices, and was last updated by
5 years ago
December 10, 2018 at 7:50 am I have a 370hp version of the 6bta, it has 130 hours, it was a factory rebuild installed a couple years ago. I recently had the head gasket replaced due to an overheat issue (raw water intake left closed). It got hot for just a minute and was shut down on alarm, but apparently that was enough to blow the gasket and bend the exhaust rod on number 4. Head was decked and 7/1000 removed, magnafluxed for leaks and new valve seats installed. I was …
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in: Cummins Marine Engines
11 RepliesMarch 13, 2019 at 10:35 pm Love the albin’sLast Post by:
posted: 5 years ago
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Heat exchanger gasket part number
This topic has 2 replies, has 3 voices, and was last updated by
5 years ago February 24, 2019 at 8:00 am On the Cummins QuickServe site parts list for my 5.9 -380HP engine, (engine serial number 46892137) it list the part number for item “40- heat exchanger gasket” as 3975187. On your site it shows as (https://www.sbmar.com/product/5-cummins-qsb-5-9-380-hp-and-below-heat-exchanger-kit/) 3910343. Are these numbers effectively for the same part?
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in: Cummins Marine Engines
2 RepliesMarch 3, 2019 at 8:04 pm The Seaboard gaskets are tan so dont be alarmed that there not black.Last Post by:
posted: 5 years ago
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6BTA 5.9 coolant drain procedure
