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- Cummins Marine Forum Topics
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Balmar alternator
This topic has 4 replies, has 5 voices, and was last updated by
1 week ago
April 10, 2017 at 6:45 am Hello,I had my starboard alternator go out on me. I have a 2001 3500 Tiara Open with twin 370 6BTA engineĀs. I have 3 AGM 1000 MCA 800 CCA house batteries on the starĀboard side. The starĀboard alternator is missing it’s tag. The tag is still on the port alternator BaĀlmar (912-100) 100 amp and it’s charging two AGM starting baĀtteries . I have a external alternator voltage regulator. ShĀould they both the star and port be the exact …
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in: Cummins Marine Engines
4 RepliesApril 24, 2024 at 1:31 pm Balmar XT series high-output alternators (assuming 2:1 ratio AltRPM:CrankshaftRPM) are around 70% of max output at 1,000 engine rpms and over 80% by the time you get to 1,250 RPM.Ā Make sure to factor in the ‘gear ratio’ (pulley ratio) between crankshaft and alternator shaft RPMs when looking at alternator output curves. If I am not mistaken, other high-output alternators have similar if not better output vs. RPM curves these days. A…Last Post by:
posted: 1 week ago
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Multi-Stage filtration for small boat diesel 39hp Yanmar 3Jh5E Diesel
This topic has 3 replies, has 3 voices, and was last updated by
2 years ago
May 6, 2017 at 1:58 pm Hi there. I’ve just bought a sailboat with a new’ish 39hp Yanmar engine and a 20+ yr old tank. With diesel bug apparently becoming more prevalent, I’m looking around at ways of making sure the quality of the fuel getting to the engine is good, and that we avoid clogged filters as much as possible. While researching, I found the Fleetguard Multi-stage “The seaboard way” article hereĀ https://www.sbmar.com/articles/mar…
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in: General Discussion
3 RepliesApril 3, 2022 at 11:25 am I just didĀ a search on my engine (for a different reason)… I’m embarassed that I never replied to this post, I must not have clicked the “follow-up via email” / seen a reply at the time.Ā I know it’s (5 years) too late now, but thank you for replying. (BTW, I’ve been using the single Racor primary since without problems, but still think about doing this from time to time. So many boat projects to get to!.Last Post by:
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QSB 5.9 Maintenance Question
This topic has 13 replies, has 7 voices, and was last updated by
2 years ago
July 11, 2017 at 6:59 am Tony and others… Last fall we purchased a 2011 Grand Banks 41EU with Cummins QSB 5.9 425HP engines and Zeus pods. After bringing her home 2,300 trouble-free miles from Holland Michigan we needed to do some service. On a subsequent trip we had one minor issue that required a call to Cummins of Jacksonville. Their tech came to the boat and fixed the small issue, but I did take advantage of the time we had together to ask his input on an upco…
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in: Cummins Marine Engines
13 RepliesMarch 23, 2022 at 1:43 pm Darryl, I believe we are now the owners of your 41EU. We are chasing a steering actuator / trim leak now. I left you a message and would love to pick your memory. Small world!ĀLast Post by:
posted: 2 years ago
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American Tug 34 Exhaust
This topic has 14 replies, has 7 voices, and was last updated by
2 years ago April 7, 2017 at 8:55 am Pictures of 2004 install.Ā I suspect the original elbow is near end of life.Ā Pictures attached.
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in: Cummins Marine Engines
14 RepliesMarch 2, 2022 at 5:19 pm Donāt make this your Final decision, phone a friend. Why would you invest in a ā near exact ā replacement when the original was not right. This makes no sense to me. Get something built properly and forget about it. Ā Maybe $5k . If you ruin the engine itās $40k and you still will need a new exhaust.ĀLast Post by:
posted: 2 years ago
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C Series 6CTA – M3 Delco 28si alternator upgrade
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This topic has 25 replies, has 8 voices, and was last updated by
3 years ago
February 23, 2017 at 1:35 am Hi Guys I have a 2000 model 6CTA M3, at the moment it has a Delco 22si alternator, J hinge, 12v, with sense wire. I think its 130amp or 145amp I am looking at installing a 28si, preferably 180amp, 8600223,Ā or 160amp 8600312, to give me more charge at idle. I do a lot of drifting, engine idle or off and when wrecking idle & low rpm,s. on a night especially I have a a large load drawingĀ from the plotters, radar, lights, heater etc. I have 2 x …
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in: Cummins Marine Engines
January 27, 2021 at 8:10 am Tony, Thanks. I have quite a bit of experience in marine electrical matters, and I am completely hands-on. I have “home run” voltage meters on all my battery banks. I have a good idea of where the power is used. I have a pretty good understanding of alternators, one-wire vs. three-wire, internal vs. external regulation, etc. The issue I am addressing is the desire for charging the house bank when underway. We cruise a lot, with overn…
25 Replies
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posted: 3 years ago
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Hello again
This topic has 2 replies, has 2 voices, and was last updated by
4 years ago
February 12, 2020 at 8:39 am I have been away from this forum for a while, but since I am now helping a friend get his new to him Cummins powered trawler in shape for a 900 mile trip back home, I thought I would reintroduce myself and follow the forum more closely. The boat and engines I am working with is a 42′ Jefferson aft cabin powered by twin Cummins 6BT 210 hp engines. The boat is a 1987 model. He just purchased it and the surveyor noted a few problems/deferred …
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in: Cummins Marine Engines
2 RepliesFebruary 12, 2020 at 9:30 am Could be it. The boat did sit idle for some time before George bought it. Will grease the rudder bearings up and see how that works. Maybe also heat the shaft a little, not enough to affect the packing and see if that doesn’t also redistribute the grease. DavidLast Post by:
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Descale Heat Exchangers 2003 Cummins 5.9 bt
This topic has 1 reply, has 2 voices, and was last updated by
February 12, 2020 at 7:37 am Hi guys, I have twin Cummins in my boat and I am planning on removing the heat exchangers to descale. I bought a gallon of Hammerhead to do the job. I was at a local boat show this weekend and was told by an engine service vendor that Hammerhead was bad stuff and would damage the exchanger. Any thoughts? Also is there any reason that I canāt use neoprene gasket material and cut my own new gaskets to reseal the exchangers?
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in: Cummins Marine Engines
1 ReplyFebruary 12, 2020 at 8:52 am I am a retired chemical engineer who spent a few of his early years in the industrial chemical cleaning business. Hammerhead seems to be no different than any of the more popular ones like Rydlyme or Barnacle Buster. All of their claims are more or less BS- safe on aluminum is particularly BS, so is environmentally safe. I have tested BB and unlike the inhibited HCl we used in my former business, this has no inhibitor so will corrode metals a bi…Last Post by:
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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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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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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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Yanmar 6LY main heat exchanger color
This topic has 9 replies, has 5 voices, and was last updated by
5 years ago February 4, 2019 at 9:04 am Please look at the attached photo. I am helping a friend who is considering buying a 2006 Mainship Pilot 34 with a Yanmar 6LY 370 hp engine. A “Yanmar Certified Technician” who was present at the seatrial said that the main heat exchanger, which is very visible in this pic, is discolored and is a sign of severe overheating. Well the color is certainly not the Yanmar silver grey, but it is entirely uniform and doesn’t look like…
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9 RepliesFebruary 4, 2019 at 7:31 pm I wish I had a much better picture so I could really “SEE”, but even a “fuzzy” view tells me that this engine, when it ran or did run, is being squeezed to the max, plus the signs of a loss of coolant in the combo exhaust manifold/coolant tank are more than obvious…………..Walk away unless someone gets a $25-30K concession on the $$.. The 6LYA is a very good engine, and IMO, is as good as a 370 …Last Post by:
posted: 5 years ago
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6BTDA Cummins Aftercooler Condition
This topic has 4 replies, has 4 voices, and was last updated by
6 years ago June 27, 2017 at 6:23 am Our new to us 1997 Bayliner 4788 has twin 330’s with roughly 1300 hours. We know the boat sat for a year (yes, I know) and don’t have any maintenance records from either of the previous owners. We had a technician doing some work and he mentioned the aftercoolers should be looked at. In looking at them both P & S housings look a bit rough and I am wondering if I should just go ahead and replace the whole assembly ($ Ouch!)? Pic…
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in: Cummins Marine Engines
4 RepliesJune 27, 2017 at 3:51 pm Only way to really find out the condition of the aftercooler is to remove it from the engine, take the core out and post some really good pictures…Last Post by:
posted: 6 years ago
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Hydraulic steering helm pump
This topic has 6 replies, has 3 voices, and was last updated by
May 22, 2017 at 6:41 am A buddy just bought an old Mainship 34 flybridge trawler. The lower helm looks original and steers ok, about 6 turns lock to lock. The upper helm looks like it was replaced and steers at 10+ turns lock to locks which is unacceptable. It is a Seastar 1.7 cu in per rev pump. The lower helm pump has no identification.. The ram cylinder is about 1.5″ id x 9″ stroke giving it a volume of about 16 cu inches. Using Tony’s hydraulic si…
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6 RepliesMay 24, 2017 at 9:59 am Tony: I helped the owner move the boat 350 miles from Md to Ny and now someone else is helping him move it up the Erie and Oswego Canals. I will contact him to message me some pics. But the upper helm, the one with the excessive locks and some light binding, is definitely a Seastar 1.7 cu ft pump. The ram is a two hose pass throgh rod type with no labeling. DavidLast Post by:
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Seized aftercooler core
This topic has 14 replies, has 4 voices, and was last updated by
6 years ago
January 14, 2017 at 10:57 am I cannot free the after cooler core from the Ā casing. Ā I have soaked inside and outside of the core with PB blaster and another concoction of ATF oil and acetone Ā for two weeks now rotating the casing 180Ā° every few days. I have tried using a sledge hammer with a piece wood and plastic on top of the core as not to damage it.It will not break free. Could I take it to a machine shop with a Ā hydraulic press,and use some heat with the press. Ā Any id…
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in: Cummins Marine Engines
14 RepliesMay 16, 2017 at 4:12 am Sorry for the delay with aftercooler progress.I had a machinist take off about 25 thou total from top and bottom of the casing.The core itself needed repair,probably from all the pounding.Searched around for some o-rings and found a couple 5 inch diameter and .156 thick.Made up my own testing equipment for future use and reassembled with lots or lithium grease and tested.Held at 15 Ā lbs.psi for 6 hours.Thankyou for all your suggestions.Bob …Last Post by:
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Interpreting Yanmar EGT
This topic has 7 replies, has 4 voices, and was last updated by
March 27, 2017 at 6:48 pm I am struggling to draw the right conclusions from our RPM/EGT data and hoping you can help steer me in the right direction. I am pretty nerdy so please don’t hold back on the technical depth (eg math) of a reply. BACKGROUND: Our prop has a small defect, so I will be pulling the prop off for pre-season service this week. The question at hand is: are we propped right? My latest conclusion is YES, but I am confused by light soot. Was hoping …
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in: All Other Marine Diesels
7 RepliesMarch 31, 2017 at 6:23 am With the white smoke going away shortly after startup, you can be pretty sure that your injectors are fine. While I agree with Tony’s recent post, I still wonder if there might be some reason your engine isn’t making its 370 rated hp and that is why it is smoking. First confirm governor performance by opening the throttle to wot in neutral. You should hit 3,700 rpm, the high idle spec. If not then investigate your governor/fuel injec…Last Post by:
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Engine after seawater in oil pan
This topic has 3 replies, has 3 voices, and was last updated by
7 years ago
March 11, 2017 at 12:01 pm hey all first time poster. Ā i have twin cummins 6bta’s (1985 recons) with 700 hrs each. Ā both have been perfect and maintenance has been routine, but i had a catastrophic failure of the after cooler on my part engine and ended up with 2 quarts of seawater in my oil pan. Ā luckily it was discovered relatively quickly because it was hard to start and throttle up out of the slip. Ā After many oil changes and a new sbmar after cooler the engine …
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in: Cummins Marine Engines
3 RepliesMarch 13, 2017 at 8:41 pm thanks for the reply david. Ā i appreciate the thoughts. Ā i think it feels like a combination of things too. Ā i’ve attached several photos of the engines exhaust to see if that helps. the first four are starboard the last 4 portLast Post by:
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So, where does the spent zinc material go?
This topic has 6 replies, has 5 voices, and was last updated by
7 years ago January 17, 2017 at 10:50 pm I recently replaced each of the zincs in QSB’s in both engines.Ā Ā They really were not all that bad, but since they are not all that expensive I figure to just replace them when I pulled them.Ā None of them were broken off, but had that “buttery” look that they get. My question is what happens to the material that sluffs off the zinc pencils?Ā Ā Does the material collect somewhere in the RW circuit?Ā Does it just dissolve, small …
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in: General Discussion
6 RepliesFebruary 13, 2017 at 11:50 pm Thanks for all of the feedback and pictures!Last Post by:
posted: 7 years ago
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Genset Heat Exchanger Maintenance
This topic has 8 replies, has 4 voices, and was last updated by
7 years ago February 3, 2017 at 7:58 am Pulled the heat exchanger off my Kohler 5EOZ genny yesterday and pressure tested it last night. I looped the seawater ports with one of the seawater hoses to close off the seawater side and I used the zinc port for pressure test. It takes a 1/4″ zinc so I used a 1/4″M to 1/8″F adapter bushing and then connected my 1/8″ fittings, gauge and schrader valve. I put plastic bag material over the coolant ports this way if I did …
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in: All Other Marine Diesels
8 RepliesFebruary 5, 2017 at 3:20 pm Phil, In my reply to your inquiries I should have also mentioned that I flushed with fresh water after the acid and again at the end..Last Post by:
posted: 7 years ago
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Wrong Coolant
This topic has 3 replies, has 3 voices, and was last updated by
7 years ago
January 23, 2017 at 11:01 am While having my oil changed in Key West, tech also offered to change the coolant in my Yanmar 6LY3-UTP (in ’09 mainship 34T). Ā I usually have all supplies on hand so I know what we’re using but I only had 1 gallon of ELC coolant and he said no problem he’d bring what’s needed. I return back to the boat this week to find the left over/extra coolant used was Peak Fleet Charge SCA Precharged…it says good for all Heavy …
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in: All Other Marine Diesels
3 RepliesJanuary 24, 2017 at 9:57 am Rob and Dave, Thanks for the response/advise…I’m going to change this coolant out for the Dex-Cool when I get the boat back to North Palm Beach this weekend. As careful as I’ve been on all service items for this engine its not worth the risk to keep it. Cheers BryanLast Post by:
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taking off exhaust riser question
This topic has 7 replies, has 4 voices, and was last updated by
7 years ago December 10, 2016 at 2:34 pm I have to remove my turbo and exhaust riser (6bta) and have a riser made. Local company wants $3200 or more…its always more. So I’m doing it myself! I always get a price first to decide if its worth my time and this is worth my time. Anyway, see the attached picture. I’m told this hose is really tough to get off. I plan on taking the turbo and riser off as one unit and then bringing it home to separate. Getting a quote from DeA…
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in: Cummins Marine Engines
7 RepliesDecember 12, 2016 at 1:16 pm Nerf football…good idea. The port side exhaust hose has aĀ strap around it and screwed into the floor above for support. I wasn’t sure why one side had this and one didn’t but that riser was replaced last year so I’m guessing they supported it above the waterline with the strap and just left it there. I’ll do the same. A local mechanic wanted to charge me $2200 for the riser when I just ordered one for $1290. Not sur…Last Post by:
posted: 7 years ago
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Convert Fresh water cooling to keel cooling Cummins 6BTA
This topic has 2 replies, has 2 voices, and was last updated by
7 years ago
December 5, 2016 at 12:51 pm I run my boat in very silty and shallow sandy conditions and I cannot keep my raw water pump working so I would like to change to keel cooling. My current setup runs raw water through my aftercooler, gear oil cooler, heat exchanger and out the exhaust elbow. I am wondering if I can just use my raw water pump to circulate coolant through my aftercooler, gear oil cooler, engine and then through an over sized fernstrum keel cooler? I understand it …
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in: Cummins Marine Engines
2 RepliesDecember 5, 2016 at 7:09 pm Thank you David for the reply. Ā So it sounds like the coolant circulation pump should have enough power to push coolant through the engine, transmission oil cooler and keel cooler? And if that works than the aftercooler could be connected to a separate keel cooler and circulated with the raw water pump. I wish this site had a picture of the coolant routing with arrows drawn in showing the flow. I saw a picture like this but it was for fuel flow.…Last Post by:
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Balmar alternator
