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- Cummins Marine Forum Topics
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Bleeding 6BTA
This topic has 10 replies, has 6 voices, and was last updated by
2 years ago October 20, 2021 at 12:06 am I recently changed the fuel cooler fuel lines and separator and engine fuel filters on my Cummins 6BTA 5.9 (330hp). On my old Yanmar, all I had to do after this kind of work was activate the lift pump on the filter assembly and keep pumping until the pump went hard to ensure the system was bled properly. I tried this using the lift pump built in to the fuel system adjacent to the fuel pump on the Cummins 6BTA, but after a couple hundred strokes …
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in: Cummins Marine Engines
10 RepliesOctober 21, 2021 at 5:47 pm Might see or hear you out there mate. We usually fish the ‘shelf off Cape Moreton. Can’t wait to get stuck into them and hopefully get a run at Fraser this year too! All the best, BenLast Post by:
posted: 2 years ago
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First Time Start-up for BTA 370 Fuel Bleeding
This topic has 4 replies, has 3 voices, and was last updated by
3 years ago March 6, 2019 at 6:43 am About to finish up my twin 370 BTA repower and need to prime the fuel lines. Best place to start. The engines were running right before install so the on engine filter should be full, the lines to the injectors should be full as well. I did remove and replace the fittings at the fuel intake manifold on the bottom of the block and lost some fuel during the changeover. However the all new fuel lines and fittings between the tank(s) and engine …
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in: Cummins Marine Engines
4 RepliesMay 11, 2021 at 4:13 pm I finally got it bled. I loosened the line into the fuel filter at the motor. Lots of air released. I pumped the manual primer. Reopened that line again. More air. The manual primer got tight and got the sqeak Rob mentioned. But she wouldnt start. I cracked open an injector, that same line into the filter, topped off the racor. Pumped again. Gave her some throttle and she fired over.Last Post by:
posted: 3 years ago
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1994 & 2016 6BTA5.9-M2 Help
This topic has 5 replies, has 3 voices, and was last updated by
3 years ago
May 8, 2021 at 9:55 pm I recently purchased a 1994 boat with twin cummins diesels. Both engine hour meters read around 455 hours. The engines look identical but have the following number plates. (look at pictures attached) STBD: serial 4483T453, 6BTA5.9.M2, 300HP @ 2800RPM (I believe to be original 1994) PORT: serial 2LB021894 6B manufactured 07/2016 with little to no other information. A couple of questions for this greenhorn with diesel engines (I’ve been …
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in: Cummins Marine Engines
5 RepliesMay 9, 2021 at 11:56 am I’ll start on that. Thank you both!Last Post by:
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1st time seawater impeller change
This topic has 7 replies, has 7 voices, and was last updated by
3 years ago April 6, 2017 at 10:49 am Ā Newbie on the site with a still new to us boat. Ā This weekend I plan to change the seawater impeller on our 6BTA5.9 M3. Ā I understand the basic concepts but would appreciate any suggestions. I noticed that the bore of the new impeller is threaded on one end. Ā “Assuming” that the installed impeller is the same will a bolt to match those threads work as a puller? Thanks in advance for all replies.
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in: General Discussion
7 RepliesMay 5, 2021 at 7:08 pm Couple tips to add: If the keyway is at 12 o’clock when you pull the impeller, the key should stay in the pump housing and not fall out. You can turn the ignition key briefly and spin the pump until you get it facing the right direction. For pulling, snap-on part CJ83-3 (around $30) fits the threads and is an excellent puller. I used a hacksaw to cut the unthreaded 1/4″ section off right where the threads start so it can easily threa…Last Post by:
posted: 3 years ago
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Burning to much fuel ?
This topic has 6 replies, has 3 voices, and was last updated by
3 years ago
July 23, 2020 at 2:37 pm I have a set of Cummins Diamond Series 6BT5.9 M3 inline six 330hp each. the motors have 670 hours each on them there 1998 year model. Are boat is a Maxum 4100scr 18,000lb gross weight. We filled up twice on the way home and recorded a fuel burn of 26 gallons per hour at a average 2300rpm at 20kts. In my mind this burn seems a little heavy. The engines seem to run good.They are Coupled to ZP marine HSW 800 VI 1.6 V drive model 1.64:1 ratio r…
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in: Cummins Marine Engines
6 RepliesAugust 2, 2020 at 10:39 am Also the fuel burn on last fill up was 21 GPH. And both engines are burning same amount of fuel gages are off a littleLast Post by:
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Looking at diesels for the first time – Help!
This topic has 6 replies, has 4 voices, and was last updated by
3 years ago July 20, 2020 at 10:24 am Hello all, I have learned a ton on the short amount of time reviewing posts on this site, so thank you! I have always had gas engines in our boats and have finally made the decision to move up to a 40+ footer with diesels. Admittedly, I have no idea what to look for in these engines which is how I ended up on here. I looked at a 2005 420 Sea Ray yesterday and took a few pics of the engine room. Is this a case of overheated turbos likely due …
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in: General Discussion
6 RepliesJuly 21, 2020 at 4:18 pm Ryan, Now that Tony has given me more G2(TY Tony) on how to visually identify the engine, a highly contingent offer sounds like the way to go. You can always ask for things in the offer and see how the seller responds. Aftercooler service is a must. Even though fresh water, we are still talking marine age. 1000 hour service is another item. On the fuel burn, yes you still need to chart the fuel burn as the only way to know what it is, is to …Last Post by:
posted: 3 years ago
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1999 6BTA-5.9M in 31 Bertram
This topic has 16 replies, has 6 voices, and was last updated by
3 years ago May 1, 2020 at 2:41 pm Hey guys, I’m still looking for a 31 Bertram with Cummins 6 cylinder and came across one that has 1999 270 hp motors with about 850 hrs. The boat has been up on land since November 2018 covered in shrink wrap since. The boat has see little use in 5 years prior. The trapped moisture is evident as some miles/mold is evident on many surfaces. I’m thinking that is not an issue as long is it is just surface mold and should be easily c…
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in: Cummins Marine Engines
16 RepliesJune 20, 2020 at 5:05 pm I agree with Julian 100 percent .There is no way to paint an engine or bilge perfectly once engines are in .Doing touch up is a tough job and after working on my bilge this spring I credit anyone who makes that effort.As far as paint overs go I really donāt think it happens too often because anyone that has a crappy bilge never cared about it from day 1 anyway.BillLast Post by:
posted: 3 years ago
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Smoke at higher RPM – 6BTA5.9 M3
This topic has 3 replies, has 3 voices, and was last updated by
3 years ago June 11, 2020 at 2:51 pm Cruising at 2400 RPM running smooth. Temp on gauge 192, Oil 45 PSI. Notice brownish smoke. Boat is a smoker at idle and underway but usually white to gray. Any ideas?
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in: Cummins Marine Engines
3 RepliesJune 12, 2020 at 6:30 am Black smoke at cruise – 6BTA M3 -370 hpLast Post by:
posted: 3 years ago
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6BTA preheater was working, now it’s not
This topic has 6 replies, has 3 voices, and was last updated by
3 years ago May 30, 2020 at 3:10 pm The preheaters on my 6BTA were working fine until I removed and re-installed the aftercooler. I can’t figure out what I might have done to damage the system. All wires are reconnected, the fuse is good, the temp sensor is good. I’m stumped. I get a lot more exhaust smoke from the cold engine now. I know one recommendation is to install a manual switch, but I’d sure like to figure out what happened!
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in: Cummins Marine Engines
6 RepliesJune 9, 2020 at 8:51 am No problem Richard, glad you fixed it. I love my “control switch” to stop the heater from cycling. I suggest you install one, not expensive, and following Tony’s info, it was fairly simple.Last Post by:
posted: 3 years ago
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6CTA 8.3-M4 480CE Sea Trial Data (How much Pitch Reduction?)
This topic has 5 replies, has 6 voices, and was last updated by
3 years ago
June 4, 2020 at 11:30 am Tony, I surveyed a 2005 42′ Searay Sundancer with a pair of 6CTA 8.3-M CPL 2960 with 1400 hours which I understand are 450 CE engines advertised at 417 h.p (not sure if that is correct) as they can be 460? During sea trial both engines at approx. 2000 RPM were burning 15.1 gph. at 2600 were burning 24.7/25 gph. I have read the article about dropping valves as a result of over propping resulting in an overloaded condition. The boat is runni…
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in: Cummins Marine Engines
5 RepliesJune 6, 2020 at 8:41 am I have a 2005 420 dancer as well with the 480’s. I am down to 24.5″ inch pitch with a light cup. At 2000 rpm my last look at the fuel flows were showing 10.3 and 11.0 That was about 3/4 fuel and just me on board. The prop shop told me the most they could take out of a prop was 2 inches of pitch. I got down to 25″ on the original props, but was still concerned about the flows. I was very fortunate to find a pair of 25 inc…Last Post by:
posted: 3 years ago
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2006 Sea Ray 40 Sundancer with QSB 380ās
This topic has 5 replies, has 4 voices, and was last updated by
3 years ago
June 1, 2020 at 5:30 am I understand this may be very limited info and please let me know if this isn’t sufficient. I’m wanting some insight to see if I should even consider to peruse this boat. I only have a few pics of the starboard engine but am somewhat alarmed with the pictures and lack of maintenance at this point. I am depending on the owner for pictures at this point. The engines have 465 hours.The boat was kept in salt water until 2012 and has bee…
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in: Cummins Marine Engines
5 RepliesJune 1, 2020 at 8:24 am Thanks guys. The info youāve provided on this boat has been excellent. I had an idea of what to expect but youāve given it clarity and depth. I had a hunch I needed to walk and keep looking and youāve absolutely helped me understand why. Thanks again for the input and look forward to being part of this board as my journey continues.Last Post by:
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Grid heater fuse removal
This topic has 6 replies, has 6 voices, and was last updated by
3 years ago May 25, 2020 at 4:12 pm I have a pair of 2001 6CTAs in my 35 Carolina classic. Iāve noticed that after starting both engines Iām watching my volt meter fluxuate up and down like something is being turned on and off. Iāve been told by friends itās probably my grid heaters cycling on and off and I may need a relay? As outside temps have risen…is it safe to just pull the fuse to the heater? Or do I have to remove all of the components in order to shut it down.? M…
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in: Cummins Marine Engines
6 RepliesMay 29, 2020 at 8:22 am Personally, I installed a “control switch” as per Tony’s instructions on this site. In this way, after sitting at anchor for a few days, I can preheat prior to starting, and then turn it off so it does not go through the automatic cycling until warm up is complete. I also installed a Wolverine oil pan heater that I use when at dock on shore power. With the switch, you have control, but you have to remember to use it. So, we hav…Last Post by:
posted: 3 years ago
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Exhaust sensor options
This topic has 1 reply, has 2 voices, and was last updated by
3 years ago May 21, 2020 at 6:19 pm I would like to install an exhaust temperature sensor for my 6bts. I’ve seen the borel band sensors and the smx one. I am completely new to doing this. What would you recommend and where should I mount it? If better photos are needed, please let me know. Thank you
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in: Instrumentation & Electronics
1 ReplyMay 25, 2020 at 6:05 am Look at these two options – Way faster response than a Borel unit that needs to sense thru the hose.The top one (hose mount) looks idealLast Post by:
posted: 3 years ago
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B series heat exchanger failure
This topic has 15 replies, has 5 voices, and was last updated by
3 years ago April 26, 2020 at 3:17 pm When recently starting my motor, I noticed a decent amount of what looked like zinc discharged out my exhaust. This surprised me as I had replaced the zincs in December and the boat has seen very little use. Upon warming the engine and oil, I changed fluids as part of routine maintenance. This is when I noticed the expansion tank level was a bit low (330 hp b series). At the time I didn’t think much of it as I have not needed to add wat…
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in: Cummins Marine Engines
15 RepliesMay 18, 2020 at 4:13 am Eliminate the easy stuff – use a 110 tester on a twist lock adapter and test the dock tower. I keep this handy on the boat and whenever we are traveling I make it a habit of testing the tower before even bothering to drag out my cord….Last Post by:
posted: 3 years ago
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Exhaust Design Question
This topic has 12 replies, has 5 voices, and was last updated by
4 years ago May 1, 2020 at 2:40 pm Making an inquiry as to exhaust system designs. I have a 40′ sportfish with 450 Diamonds. Recently had a turbo failure on the stbd side at around 1,250 hours. Questioning why and after much study of Tony’s excellent articles on the subject I suspect a design issue. The current set up is a factory 90 degree wet elbow out of the turbo going into a series of 6 inch fiberglass curves and hose, then thru a muffler and then out the bac…
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in: Cummins Marine Engines
12 RepliesMay 9, 2020 at 4:34 am An older 40ft sportfish should have the room needed. Looking at your pics you’d need to get rid of that light fixture hanger/shelf and clean up some wiring and fuel lines and you should be totally fine to do something like what Douglas posted ā¦ up, over & back down to that FRP 90 at the hull side. Once it’s all wrapped with a quality properly fitted wrap like those from ATP that Seaboard uses it will be 100% safe even with any t…Last Post by:
posted: 4 years ago
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NO FUEL TO INJECTORS 6bta
This topic has 7 replies, has 5 voices, and was last updated by
4 years ago
April 30, 2020 at 5:24 pm Hello all, I am new to the forum I appreciate everyoneās help in advanced. I recently purchased an old Chris craft that I plan on restoring powered with two 1988 Cummins 6bta 250hp engines. I have been trying to start them and for the life of me they wonāt start. I have checked the fuel solenoid and pulled out itās guts for testing. I have a new battery with great voltage. I have bled the fuel pump (Lucas Cav rotary pump) all the way to the lift…
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in: Cummins Marine Engines
7 RepliesMay 1, 2020 at 6:28 am I thank you very much Tony I will try that here in a little while and report back with the results. Do I need to change anything on the tank setup looking at the picture I posted?Last Post by:
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Proper Racor Prefilter for Cummins 330 6BTA
This topic has 7 replies, has 4 voices, and was last updated by
4 years ago March 2, 2020 at 8:55 pm I have a pair of 2000 Cummins 330 6BTA engines, which have on-engine Fleetguard FF5285 screw-on fuel filters. Each engine also has a single Racor 900 pre-filter. The engines are currently running 10 micron pre-filters in the Racor (2040TM), and from what I have read the on-engine FF5285 appears to be a 20 micron filter. It seems backwards to me to have the pre-filter finer than the “last chance” on-engine filter; at the same time, I …
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in: Cummins Marine Engines
7 RepliesMarch 11, 2020 at 5:02 pm DeWayne, the thread size is the same but that filter is several inches taller. Shop here: https://www.sbmar.com/product-category/fuel-systems/fuel-oil-coolant-filters/fuel-filters/on-engine-fuel-filters/Last Post by:
posted: 4 years ago
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1995 6BTA5.9 (315hp) in a 32′ Ellis
This topic has 6 replies, has 5 voices, and was last updated by
4 years ago
February 20, 2020 at 5:06 pm Hi – I’m new to the forum. I’m going to look at a 32 Ellis paired with a single 315 6BTA5.9 (1100hrs). Is this a good pairing? What would be noticeably bad signs to look for with this motor? What are best questions to ask outside of trying to get maintenance records etc…this will also be my first diesel powered vessel so pretty green here. thanks JPR Engine Brand: Cummins Year Built: 1995 Engine Model: 6BTA5.9 Engine Type…
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in: Cummins Marine Engines
6 RepliesFebruary 21, 2020 at 4:40 pm “Diamond 330” is 315 bhp. (330 was the marketing number)Last Post by:
posted: 4 years ago
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6BT Rusty Water Pump
This topic has 2 replies, has 2 voices, and was last updated by
5 years ago March 10, 2019 at 11:02 am Hi all, Im replacing the front seal on my 6bt. Im getting everything off and cleaned up then gonna have the boatyard reseal it so I know its done right. Got a small leak. I noticed rust on a pulley, looked at the tech stuff on the site and I guess its the water pump. Im thinking I should replace it?
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in: Cummins Marine Engines
2 RepliesMarch 11, 2019 at 6:01 pm For now, that’s what I would do, including the rest of that general area,……………Then, watch it carefully.. TonyLast Post by:
posted: 5 years ago
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Limited access to bottom of oil pan, best alternative to pad heaters
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This topic has 25 replies, has 9 voices, and was last updated by
5 years ago December 10, 2018 at 8:12 am Hi all, My 6bts take awhile to start. I know the wolverine heaters are ideal, but access to the bottom of my oil pan is just not there for them. What is the best alternative? Thank you
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in: Cummins Marine Engines
January 27, 2019 at 12:56 pm That’s just over $50 A month. Not too bad to protects all that expensive iron.
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posted: 5 years ago
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Bleeding 6BTA
