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- Cummins Marine Forum Topics
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Single diesel displacement trawler repower
This topic has 2 replies, has 3 voices, and was last updated by
7 months ago September 7, 2023 at 10:08 am Hi folks, I’ve got a 42 ft, 36,000 lb trawler with a Cat 3208TA and a TD507 2.54:1 in her.Ā It’s a Sunnfjord 42, they mostly build commercial boats and fishing boats but ours was built as a yacht. It’s go an 8″ wet exhaust going into a shower can style riser. Injection point is 48″ above DWL so they got that right. The Cat has 9000 hours, we plan to keep the boat long term so want to repower now rather than after it…
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in: Boats & Repowers
2 RepliesSeptember 9, 2023 at 7:18 pm What RPM and vessel speed do travel at when going from Point A to Point B?Ā Ā That will be a start as to whetherĀ “much less engine” will be suitable. Your hull is probably a 6-8K easy to move WINE & CHEESEĀ cruiser..Last Post by:
posted: 7 months ago
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Feedback on 6BTA CPL 1975
This topic has 10 replies, has 3 voices, and was last updated by
8 months ago June 25, 2021 at 9:17 pm I’m assisting a friend looking at a 33 Riveria with a pair of year 2000 built 6BTA with CPL 1975. 280hp rating @ 2600. I’m no stranger to 6B’s, but looking for any feedback that this particular spec warrants looking at. All the usual suspects check out well, they achieve 100rpm over rated at full throttle, and thankfully the exhaust mixer design is well laid out. Still has the original (albeit rebuilt) Sherwood seawater pumps …
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in: Cummins Marine Engines
10 RepliesSeptember 7, 2023 at 6:50 pm Idler upgrades and 160* stats, TICK. <br />All they need now is fresh water flush setup.Last Post by:
posted: 8 months ago
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HELP! Cummins 555 fuel pump leak
This topic has 1 reply, has 1 voices, and was last updated by
8 months ago August 24, 2023 at 8:25 pm G’day team. Helping my neighbor here with one of his glorious old 555 naturals. I think this is just a coincidence, but this occurred right after changing all fuel filters. Symptom is; Starts and runs fine, then after a couple of minutes running, engine stall regardless of throttle opening. Will restart quite well immediately, possibly a little bit of fuel starve type misfire. Starts perfectly after sitting for 5 minutes. Have checked all …
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in: Cummins Marine Engines
1 ReplySeptember 7, 2023 at 6:49 pm Solved. <br />Bad fuel solenoid intermittently dropping the coil. <br />The leak is unrelated, bad o-ring.Last Post by:
posted: 8 months ago
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Low Oil Pressure Alarm and Defective Panels
This topic has 2 replies, has 3 voices, and was last updated by
10 months ago
June 26, 2023 at 11:20 am After purchasing two remanufactured Cummins 6BTA engines, wiring harnesses, exhaust risers, engine isolators, and panelsā¦.nothing but problems.Ā Worse yet, Cummins refused to honor their 2 year warranty, despite 7 independent and timely claims.Ā Ā Even the Cummins dealer, Carolina Marine, falsely certified the engines BEFORE the sea trial. The most serious problem was false low oil pressure alarms at low RPM.Ā Apparently, this condition is…
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in: Cummins Marine Engines
2 RepliesJuly 3, 2023 at 11:40 am WOO asks a good and validĀ question. Where do you maintain the oil levels?Ā Ā Ā Ā You should have two marks, one for full and one for add.Ā Ā Which one do you maintain the level at. I ask because these engines often have a shallow pan.Ā Ā If the oil level is maintained at the high level and you haveĀ much of a tilt to the engine mounting the level can be whipped into a froth by the crankshaft,Ā bubblesĀ can whichĀ can cause this problem.Ā Ā Ā They…Last Post by:
posted: 10 months ago
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ReCon 12 valve 6BTA Air Filter (upgrade?)
This topic has 4 replies, has 4 voices, and was last updated by
11 months ago May 9, 2023 at 12:43 pm I have twin 6BTA ReCons (315hp).Ā The boat had been on land for several years prior to my purchase 2 seasons ago.Ā when I bought it I simply replaced the oem duralast air filters that were on it. One of my transmission oil tubes sprouted a leak and soaked one of the filters.Ā Needless to say the filters cost 2x what they did in 2020. Questions Ā Ā Ā Can I run the engine with an oil soaked OEM air filter? Ā Ā Ā Can I clean the filter? Ā Ā Ā Has an…
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in: Cummins Marine Engines
4 RepliesMay 11, 2023 at 5:46 am My EnviroVent w/S&B’s was first installed on my 330B’s 15 years ago.Ā Always easily makes 100+ over rated rpm, engine room stays super clean and no noticeable turbo whine (but that depends on your engine room configuration). I’ve changed the filters a couple times and changed out the corrugated hose once.Ā ĀLast Post by:
posted: 11 months ago
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Wwhat engine to replace 6bta 370?
This topic has 5 replies, has 5 voices, and was last updated by
1 year ago March 28, 2023 at 5:19 pm Well, the State says it’s time so I have to replace my excellent 6bta 370 with a tier 3 engine. What engine would be the correct replacement. I have plenty of height but not much width in the engine room. The 370 pushes the boat at 15 knots at 2400 rpm.Ā
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in: Cummins Marine Engines
5 RepliesMarch 31, 2023 at 5:57 am There must be thousands of boats on the water that will need to upgrade from Tier I to Tier III. There will be a bonanza in engine sales and replacements.Last Post by:
posted: 1 year ago
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Fuel Sheen
This topic has 14 replies, has 6 voices, and was last updated by
1 year ago March 19, 2023 at 4:46 pm Hi there. I just got my aftercoolers back from SBMAR, and put them back on, I was told they were cleaned and pressure tested. I also just finished installing SBMAR CCV kit (thanks Justin). My question is Starboard engine seems to have lots of fuel coming out exhaust and making sheen on the water. Didn’t really have that prob before, and port Engine not doing it? 98 6BTA 330 aprox 2300 hours , new injectors about 3 years ago. Thx for info- …
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in: Cummins Marine Engines
14 RepliesMarch 30, 2023 at 2:52 pm thx for infoLast Post by:
posted: 1 year ago
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Aftercooler Leak 6BTA
This topic has 4 replies, has 3 voices, and was last updated by
1 year ago March 20, 2023 at 4:29 pm This past weekend I found out my heat exchanger was leaking from the end cap gasket.Ā Saltwater was spraying on the engine.Ā I took the end cap off and noticed the 2 surfaces were smooth.Ā New gaskets on order.Ā What is the best way to clean and protect the engine surface where the water was spraying.Ā This is for a 6BTA 370hp engine. Thanks Ron
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in: Cummins Marine Engines
4 RepliesMarch 22, 2023 at 9:38 am Tony, Thanks for your help.Ā Ā My mistake for saying aftercooler. RonLast Post by:
posted: 1 year ago
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Is 1 1/4 Raw water pick up enough for 6BTA 370’s?
This topic has 3 replies, has 3 voices, and was last updated by
1 year ago
March 20, 2023 at 6:08 pm I’m sure this will be the first of many questions as I go down the road of repowering my 1974 35 Bertram convertible. Basic overview is the boat originally came withĀ big blocks. then at some point she was repowered with Cat 3208 NAs with aftermarket M&W turbos…. IĀ run the boat forĀ charter fishing…but it has come to the point whereĀ Ā I need a little upgrade in speed, fuel economy and Technology. I am repowering Her with t…
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in: Boats & Repowers
3 RepliesMarch 21, 2023 at 9:14 am Thank You Guys.. nice to confirm what i was thinking…..ĀLast Post by:
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Oil from raw water pump?
This topic has 3 replies, has 3 voices, and was last updated by
1 year ago January 21, 2023 at 12:45 pm See pics.Ā I’ve got a very small amount of oil coming from two spots on my raw water pump housing. Would this be shot, or an issue with the seals? Never had this before, so any input or advice is appreciated! This is on a QSC 8.3 BTW.Ā Thank you!
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in: Cummins Marine Engines
3 RepliesJanuary 22, 2023 at 10:17 pm Wait Watch and Monitor is my suggestion.Last Post by:
posted: 1 year ago
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FW Flushing Options
This topic has 8 replies, has 6 voices, and was last updated by
1 year ago
November 22, 2022 at 11:47 am I removed my fuel coolers when I installed SMX pumps.Ā Looking to start freshwater flushing after each use.Ā Can I add a bronze T adapter/ball valve in the hose replacing the fuel cooler between the output of the raw water pump and bottom of the aftercooler? From the t-adapter/ball valve I would have water lines going up to quick connects under the port and stbd gunnel for easy access. I have Southbay strainers (external wedge style).Ā No intern…
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in: Cummins Marine Engines
8 RepliesDecember 16, 2022 at 6:16 am āSeaboard is working on some new risers/mixers for me now so they will be rightā āIāve confirmed I have horizontal water lift mufflers so Iāll need to flush with the engine onā Its unlikely but you may still be able to flush with the engines off if there is enough height over the mufflers and the exhaust outlet is above the waterline. As Seaboard are involved with redesigning your risers/mixers they would know if you have supplied drawings/measu…Last Post by:
posted: 1 year ago
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Turbo to Exhaust Elbow bolts QSB 5.9 380hp
This topic has 16 replies, has 8 voices, and was last updated by
1 year ago
October 12, 2022 at 12:36 pm We’ve had boat for 4 years. Getting around to short list on maintenance. Last item- replacing bolts on turbo outlet to exhaust elbow.Ā I’ve soaked the bolts for 4 days now with PB Blaster. Bought a Proto 6 point 10mm “long” combination wrench. Tried with modest force double wrenching the easiest bolt (11 o’clock position) with no movement.Ā I’m a little disappointed in the wrench “fit” on the hex h…
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in: Cummins Marine Engines
16 RepliesNovember 9, 2022 at 1:42 pm I had trouble getting the same bolts out a few years ago.Ā My bolts were a little rounded.Ā I ended up ordering these: Ā Ā https://www.zoro.com/ken-tool-low-profile-twist-socket-set-10-pcs-30271/i/G2926443/?utm_source=google&utm_medium=surfaces&utm_campaign=shopping%20feed&utm_content=free%20google%20shopping%20clicks&gclid=CjwKCAiAvK2bBhB8EiwAZUbP1KpaCXfrc2p_PbC6durD9VsV85upeoxmZjOFqq45nunjChOsSU02rBoCsqQQAvD_BwE I was…Last Post by:
posted: 1 year ago
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Remote Coolant Tank – 6BTA 330
This topic has 10 replies, has 5 voices, and was last updated by
1 year ago August 25, 2022 at 6:45 am Saw some photos on the Seaboard site showing custom remote coolant tanks.Ā I’m interested in doing the same.Ā Currently have the “L” shaped coolant tank that sits over the heat exchanger on the right side of the engine.Ā Ā Thinking of moving the tanks to the front bulkhead (I have access up to the front via a hatch) and running all new coolant hoses.Ā I could move the overflow bottle if needed. Engine room is tight.Ā My reasonin…
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10 RepliesSeptember 30, 2022 at 4:28 am The smallĀ bleeder lines to the top of the tank need to be max ID of 3/16″ to the various spots on the engine. 1/8″ ID will work.Ā Ā Bigger than that and the engine will /may overheat–WHY?Ā Because all bleed water by-passes the HX.. The make-up line on the bottom on the tank = 5/8″ minimum ID,Ā Ā 3/4″ ID preferred.ĀLast Post by:
posted: 1 year ago
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Tax Payer Hot Rodding
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago April 16, 2022 at 10:13 am This is what you can get for $350K these days when you need a bunch of them Ā Based on the QSB 5.9 ( 480??) You get 400 Hours and then you send it back yo the “upfitter” in Florida for a complete go-thru redo ( of course on your dime) 2-Speed gear box ( the main case is a Velvet Drive for sure) with a 2-speed tail shaft?Ā Ā Drives a 36Ft military rib with,Ā Ā probably w/ twin Mercury racing division out-drivesĀ The more you look at the…
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in: General Discussion
1 ReplyApril 20, 2022 at 6:35 pm Wow Tony, that’s fascinating. They’ve certainly left nothing to the imagination there!Last Post by:
posted: 2 years ago
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Qsb 5.9 480 Recon
This topic has 17 replies, has 4 voices, and was last updated by
2 years ago March 22, 2022 at 9:44 pm I run a 38ā buddy Davis with twin qsb 5.9 480 Recons. previous motors were Detroit 671s then previous owner repowered with the qsbās. Every since repower there has been bad vibration at 1400-1800 rpms with the right props which were 24×24 4 blade Veems. When I first got the boat we hauled out for a dry dock and noticed the shafts were hard to spin then we noticed wear on both rear cutlass bearrings which were changed. Then we figured…
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in: Cummins Marine Engines
17 RepliesMarch 28, 2022 at 7:29 am You are totaling missing the point.. It does not matter anymore what your boat actually weights.. It is what is is and you have to work with that Ā Ā Ā 2. You are not addressing my questions regardless of what you thinkLast Post by:
posted: 2 years ago
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New Diesel Engine owner (sorry, it's a yanmar)
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This topic has 126 replies, has 6 voices, and was last updated by
2 years ago April 29, 2017 at 5:55 am I just wanted to greet everyone. I just bought my first Diesel. An Albin 28 2005 model flush deck powered with a 315 yanmar. I wish I could have gotten a cummins B series, but that just isn’t available in the flush deck design I wanted. That said, I will be reading and researching as much as possible to keep this engine working well for as long as possible. It is the original engine, and had about 900 hours on it. It was in fresh water mos…
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in: General Discussion
March 3, 2022 at 5:34 am Hi all ā Long post warningā¦ š Just wanted to document what modifications I have done so far with my exhaust. I am a novice, and learning, so critical comments are welcome. I removed the exhaust elbows off the engine and inspected the turbo. It looked similar to my previous inspection in late 2017, with some rust present, but the flan blades and such still looked in good shape. Of more concern was the unevenness where the elbow bolts onto. I did …
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posted: 2 years ago
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Twin Disc MG5050A broken
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago February 2, 2022 at 10:21 pm Trying to assist a friend here with a Riviera 33 with 6BTA’s backed by MG5050A in a believe, 1.5:1 ratio. Diagnosis: Gearbox is in Fwd gear even when shifter is in Neutral. Move shift lever to Reverse instantly stalls engine. Oil filthy black with metal. Anyone had this issue before that can shed some light on it before we get the transmission out? Likely repairable or do we feel, likely a write off? If a replacement is needed, anyone wit…
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in: Marine Transmissions
2 RepliesFebruary 3, 2022 at 7:54 pm Might be best if I contact Corey for a price for 1 or a pair of 220A then.Last 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…
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in: Cummins Marine Engines
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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Prop clearances/distance. Two questions.
This topic has 4 replies, has 3 voices, and was last updated by
2 years ago
January 9, 2022 at 10:21 pm Ā Ā Can someone clear up these clearances/distances for me. Ā What is the recommended clearance from the prop to the underside of the hull.Ā Also. I have a transom mounted rudder. I understand the idea of having enough clearance from prop to rudder to change the prop without removing the rudder. What is the distance from the prop to the face of transom. Is there a Min. that should be observed?Ā Will there be cavitation issues if the prop is too c…
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in: Boats & Repowers
4 RepliesJanuary 11, 2022 at 10:00 pm Ā Ā Ā Ā Ventilation?Ā is this a condition where air can enter the prop wash/ prop from the end of transom into the prop? Looking at some drive examples where props on some boats appear to be close to the face of the transom, I have seen that the transom has been extended in the area above the prop. Is this a solution to prevent Ventilation? Ā Ā Thanks for your advice and knowledge.Last Post by:
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BT6 mid speed black smoke
This topic has 4 replies, has 3 voices, and was last updated by
2 years ago
December 19, 2021 at 9:18 pm In May I bought a Riviera 3300 with twin BT6 engilo o wanes. 1993 but only 10001000 hours on them. Had a pre purchase mech survey and oli analysis. Clean bills of health apart from corroded heat exchangers which were replaced with new. Covid arrived and we could not go to the boat for 4 months. On first use after the port engine would initially not rev past 1500 and blew clouds of black smoke at that speed. Cleared after a few minutes but since…
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in: Cummins Marine Engines
4 RepliesDecember 21, 2021 at 4:34 am First thing I did is slip the boat, clean and antifoul with propspeed apied to props and shafts. Same before and after slipping. So clean Properly cleanLast Post by:
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Single diesel displacement trawler repower
