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- Cummins Marine Forum Topics
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Sheared bolt inside C450 Turbo
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This topic has 22 replies, has 9 voices, and was last updated by
1 year ago January 30, 2017 at 8:54 pm Hi SB crew I have a Riviera 4000 offshore express on Gold Coast, Queensland which featuresĀ 2 x 1997 6CTA8.3 aka C450 Diamond Series with around 1000 hours on the tachourmeters. The other morning I found a bolt in the engine room and it is from the turbo where the exhaust bolts to the turbo. Please refer attached photos. Recent running wasĀ not hard and last couple of runs before this discovery we were only doing aĀ leisurely 10 knots or 1100rpm.Ā …
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in: Cummins Marine Engines
October 27, 2022 at 2:49 am Hi SB Crew After almost 8 years to the day we sold our beloved Riviera. In due diligence we pointed the new owner, Rodney to your awesome site, this forum and these specific topics. In those 8 years we never had the rocker covers off … not saying that is a good thing… but lucky for us we never had a failure. Also never got to install my new SMX sea water pumps. The best thing we did was to plumb fresh water input after the sea cocks.…
22 Replies
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posted: 1 year 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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Fleetguard Fuel Filters
This topic has 12 replies, has 6 voices, and was last updated by
4 years ago March 11, 2017 at 1:22 pm I use the Seaboard Double Double system for my fuel filtration. Ā My vacuum gauges are reading about 2″-3″ mm HG. Still in the green zone. A friend who is a powerplant generator operator said the filters need to be changed out every 2 years regardless of the reading because the paper elements break down. Ā I have never heard that. Ā Is that something to be concerned with or should the vacuum gauge be the determining factor. Thanks in ad…
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in: General Discussion
12 RepliesDecember 7, 2019 at 6:30 am On a Cummins electronic engine ( can’t speak for others as I do not know there “fuel system”), max fuel flow occurs only under load, plus on an average, total fuel flow is measurably less with the common rail engines. As a comparison– Max fuel flow with any QSB 5.9 is about 50 GPH at full engine load/RPM Max Fuel flow with a 6BTA 5.9 370 is about 73 GPH and occurs at approx 1800- 2000 RPM in neutral or under load. Lowe…Last Post by:
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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Temperature creep
This topic has 12 replies, has 3 voices, and was last updated by
5 years ago
August 8, 2017 at 1:02 pm Engines are 1994 cummins 6cta 8.3’s rated 400 hp with denso pumps. Work completed in the last 1.5 years: Two new aftercoolers, Rebuild of seawater pumps, replace serpantine belts, new injector tips, Valve lash adjusted, two new turbo chargers, descaling of HX exchangers, addition of Fresh water flushing (used all the time since new coolers put on). This weekend while boating, when we put the boat on plane, 2150 rpm, 20 PSI boost, 19.5 …
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in: Cummins Marine Engines
12 RepliesJanuary 27, 2019 at 10:10 am We have our boat in contract, and thus doing sea trial and survey. As part of the Survey, we did a 1 minute WOT run, RPM’s on both engines stabilized at 2675, we were pretty well loaded up with people, fuel and water. Thought I’d give the community an update on this old thread. The mechanic who was aboard was very pleased with the RPM, he said most setup’s he see’s struggle to get past 2550. I attribute that to boat m…Last Post by:
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raw water coolant flow rate at idle??
This topic has 10 replies, has 7 voices, and was last updated by
5 years ago July 30, 2018 at 11:27 am This is a question which may cause me to modify my fresh water flushing approach. First, if anyone can check my calculation, that would be great. Per a spec sheet I have for a C series 400 engine, raw water flow is 63 gpm (assuming that number is at rated rpm. So, doing the math, I calculate a flow of 14.5 gpm 18.7 gpm at an idle of 750 rpm. A calculator I found online indicates that my city water connection via 5/8th’s 50 foot hose…
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10 RepliesNovember 22, 2018 at 8:06 am Rob, This is my first winter with this boat and Cummins engines. I’ll try flushing both ways next season and see what happens. Thanks!Last Post by:
posted: 5 years ago
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Marine Age…Age Is Just a Number
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This topic has 21 replies, has 9 voices, and was last updated by
5 years ago October 19, 2016 at 5:51 pm Don’t let marine age get the best of your engine room. Ā Here’s an example of a pair of 330B’s installed in 2002 and a genset from 2005. Ā That’s 15 seasons for the engines and 12 for the genny. Ā Dry engine rooms vents, Ā dry overhead environment or proper drainage of above decks, Wolverine pan heaters and periodic checks and spraying and wiping down with anti-corrosion products. Ā That’s some of the key ingredients whi…
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November 2, 2018 at 1:10 pm Thanks. I have looked at those a lot, and will add them to my winter list. 21 Replies
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posted: 5 years ago
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Thru hulls
This topic has 13 replies, has 5 voices, and was last updated by
March 14, 2018 at 5:40 am I was going to lube up all my thru hulls while the boat was out..the engine thru hulls need an extension handle to get going .i usually use white lithium grease but was wondering if someone had a good way of freeing them up that last over time.
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in: General Discussion
13 RepliesApril 25, 2018 at 4:41 pm My starboard main closed with an extension for engine flushing, then stuck solid afterwards. I finally was able to get it opened by putting a wrench on and working it pretty hard. I picked up a zerc fitting, but it on the drain, pumped in some grease and exercised it about 20 times and can now move it by hand with out the extension. When time permits, I’m going to pull the hose off, close the valve and pour barnacle buster in it to help …Last Post by:
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Battery Question
This topic has 6 replies, has 6 voices, and was last updated by
6 years ago
April 16, 2018 at 11:04 am Hi Guy’s I am looking at changing my 8D batteries. They are in a bad spot and to heavy for me to be dragging around. I was thinking about 4D’s or wiring two group 31’s together? The motors are QSC 8.3. Does anyone have any suggestions on what is the better way to go. The generator and battery charger are on the whole time the boat is away from the dock. Thanks George
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in: Cummins Marine Engines
6 RepliesApril 17, 2018 at 7:34 am Thanks guys for all the input. I think I will be going with the group 31 setup. I think I can manage those the best.Last Post by:
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Electrolysis eating fuel coolers
This topic has 5 replies, has 4 voices, and was last updated by
April 16, 2018 at 3:16 pm I own a 2005 Searay 39 Dancer with cummins 5.9 qsb’s. The starboard fuel cooler let go & racor water alarm goes off. I have owned the boat since new. 1st cooler let go in 2011 at 600 hours. Replaced cooler ran ok for 2 years (200 hrs) then let go again. I have replaced every 2 years since. All my zincs on starboard side( lower after cooler, trim tabs, water strainer pick ups for starboard engine, a/c all only last 3 months. The starboa…
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in: General Discussion
5 RepliesApril 17, 2018 at 4:21 am I was having trouble with exessive zinc consumption and had a galvanic survey performed. The system was entirely intact and we were puzzled. We then did a check of the power post on the dock. What we found is the power post was sending .005 volts back to the boat, causing all my issues. We installed a galvanic isolator and zinc consumption became consistent with my neighbors.Last Post by:
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Coolant valves risk?????
This topic has 1 reply, has 2 voices, and was last updated by
6 years ago April 13, 2018 at 3:58 pm I was in my engine room and doing some cleaning and painting, general checking for leaks. Recently we had to take the starboard Turbo off for replacement of exhaust elbow, that described in a different thread. While looking around, I noticed that the valves which controlled coolant flow to my coolant filter were closed. That had been done I expect to lower the coolant (Not done by me, done by my mechanic). My question is; if I’d run th…
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1 ReplyApril 13, 2018 at 5:47 pm The two small coolant valves only allow a slow flow thru the Coolant filter.. Closed or open, will not affect anything to do with engine temps.. If it makes you feel better, they eliminated the filter all together on the QSC.. Personally, and from 25+ years of dealing the the 6CTA, I’d have no issue eliminating it as long as you check coolant makeup every few years/ 2000 hours ( which you should do anyway) .. With the mid-stop liners in…Last Post by:
posted: 6 years ago
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Coolant recovery bottles?
This topic has 4 replies, has 2 voices, and was last updated by
April 6, 2018 at 11:34 am I’ve noticed that I never have coolant in the recovery bottles. Could this be a sign that I need to new caps, that something isn’t operating correctly? The recovery bottles are mounted on a bulkhead at least 1.5 feet higher than the main coolant tank, and they are 4 feet away from the tank. Perhaps the hose is performing the function of the recovery bottle?
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4 RepliesApril 8, 2018 at 1:56 pm I’m a bit embarrassed, as I’ve already with my own hands pulled off and replaced aftercoolers and Turbo’s and exhaust elbows… Should I be adding coolant in the recovery bottle, or into the main tank on the engine??? Thanks The recovery bottles became very difficult to access when cockpit airconditioning was added to the boat (Previous owner), a duct runs directly above the recovery bottle which makes access a pickle even …Last Post by:
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CCV???
This topic has 1 reply, has 2 voices, and was last updated by
6 years ago April 5, 2018 at 5:03 am I’ve got 6cta cpl 1282 engines circa 1994, rated 400HP. I’ve sorted most of the issues/deferred maintenance out over the last several years, and am getting to the point of buffing up the last of it. The CCV system on the engine has some type of filter which appears to be non serviceable. On my boat, it connects to a hose which simply points straight down, and is showing no oil/puke coming from it or below it. That makes me think p…
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1 ReplyApril 5, 2018 at 6:26 am Hello James, Pics of YOUR engines and setups are always super important to understand exactly what you are dealing with. But to answer your question, yes there is an Envirovent setup for the 6CTA…simple and affordable. See these links below: https://www.sbmar.com/wp-content/uploads/2015/10/C-Series-Envirovent-Installation.pdf https://www.sbmar.com/product/envirovent-ccv-kit-6cta-8-3-qsl-9-series/Last Post by:
posted: 6 years ago
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Block heaters in Florida?
This topic has 9 replies, has 2 voices, and was last updated by
6 years ago March 29, 2018 at 9:33 am Is anybody using the block heaters in Florida, and are you finding a positive impact during the summer? My engines are 6cta 400’s with nippon denso pump. They fire on the first revolution, but do smoke a little bit. Given they are 27 years old, I intend to do anything I can to make their lives easier. thanks Jim
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9 RepliesMarch 30, 2018 at 2:48 pm Keep it safe and leave the Christmas crap in the attic….. should run 24/7 anyway, that’s how you get by with low wattage..Last Post by:
posted: 6 years ago
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Turbo's
This topic has 12 replies, has 4 voices, and was last updated by
March 5, 2018 at 4:19 pm Sorry, no pictures right now due to computer frustration and access issues on the boat. I’ve pulled the exhaust elbows off of my 6cta 8.3 400 nippon denso 1994 era engines. Inspection of the Turbo’s show zero signs of corrosion and zero tip erosions. There is a nice healthy coating of carbon, which is what I expected to see. My simple question is, should I use this as a chance to clear the carbon off and do a quick cleaning with B…
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12 RepliesMarch 10, 2018 at 3:43 pm Tony – I’ll cut an order with you folks with expedited shipping for the graphite gaskets. We are planning to put the new elbows on Wednesday or Thursday depending on shipping. My new mechanic, who is terrific, laid into me about the condition of those bolts, and I had to plead, I didn’t do it!. Due to your guidance on BD and this new forum, I’ve become a much more knowledgeable, owner and obsessive about engine room c…Last Post by:
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9KW Onan Generator 1996
This topic has 8 replies, has 5 voices, and was last updated by
6 years ago June 19, 2017 at 5:18 pm Has anyone had a issue with a 9KW Onan Rotor? If so did find the part? My local Cummings/Onan service shop say they discontinued the part. Not sure if they make one yet under a different part number, but it’s not looking promising. Does anyone know if the engine, which is a 3 cylinder Kubota can be adapted to a different Stator/rotar assembly? Any help would be appreciated.
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in: General Discussion
8 RepliesMarch 9, 2018 at 6:04 pm Sherlywang, You do now this is a “Marine Engine” forum 100% related to boats & marine applications centered around Mid-range Cummins Marine diesel engines, right??.. But it is nice to know, propane along with CNG are not all that practical in the big scheme of things……… LNG? Well, it still has along ways to go as to a marine applications like are discussed here .. Remember, LNG is a “use it or lose…Last Post by:
posted: 6 years ago
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Air preheat
This topic has 3 replies, has 4 voices, and was last updated by
6 years ago February 18, 2018 at 6:10 pm On my 38 Tiara with 480 ce engines I have an air preheat system. I have been hesitant to use it because I’ve heard negative remarks about wear on alternators and batteries. I do have some white smoke on start and would consider using it if it’s considered effective.The only information Tiara puts out is to turn on the switch then turn on the port ignition and battery voltage will drop to 11 volts .then after 10 seconds it will retu…
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in: Cummins Marine Engines
3 RepliesFebruary 22, 2018 at 10:05 am James, Yes pan heaters 24/7/365 will control keep engine room humidity. Search Wolverine and read my posts, I have written on this including real monitoring data. Get yourself a hygrometer that records min and max values and see what kind of high and low swings you’re getting, that all leads to moisture from condensation.. https://www.walmart.com/ip/ThermoPro-TP50-Hygrometer-Indoor-thermometer-Humidity-Monitor-Weather-Station-with-Temper…Last Post by:
posted: 6 years ago
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Easy question
This topic has 4 replies, has 3 voices, and was last updated by
December 7, 2017 at 2:52 pm I am about to change the oil on my 6cta engines. Typically I’ve had all the parts and oil on hand and have a mechanic I trust do the labor. A big yard bill for new bottom paint, cutlass bearings, engine alignment and prop tuning has really eaten up the budget, board of directors (my wife) is concerned. So, I’m going to change the fluids myself. Here comes the easy question. Should I pre-fill the filters with oil prior to start up…
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4 RepliesFebruary 21, 2018 at 5:58 am I did prefil the filters and was surprised by how much oil they held, close to 4 quarts, and how long it took to get fully saturated. Thanks for the tips!Last Post by:
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Installing New Elbows
This topic has 7 replies, has 5 voices, and was last updated by
February 16, 2018 at 2:41 pm We spotted some tiny weeping from one of the stock cummins elbows, and decided time to replace before big problems occur. We are going with a new design, but one that will fit pretty close to the existing foot print. The approach we are taking is a dry 90 elbow with insulating wrap, with a 4 inch long shower head at the end of the 90. That takes the injection point well below the turbo outlets, and ensures that gravity is always working on o…
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7 RepliesFebruary 18, 2018 at 3:30 pm Bill – I really appreciated and enjoyed your comments. My existing elbows completely drain, but a potential failure point in them is too close to the turbo’s for my comfort. What we are doing is taking the existing elbow geometry and constructing a dry section which is very similar. That is then extended another for inches for a shower head which is well below the turbo. The entire wet section is well below the turbo, so gravity i…Last Post by:
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Just bought first diesel (Cummins) boat, blue smoke
This topic has 19 replies, has 10 voices, and was last updated by
6 years ago
December 1, 2017 at 5:19 pm Hi guys, new member and first time poster here. First I want to say thank you for this awesome web site. Just purchased my first diesel boat, a very clean 2002 410 Sea Ray Express powered by twin Cummins 6CTA8.3-M3 450 Diamonds (Serial numbers 46177147 and 46176773, CPL 8089). Engines only have 750 hours on them but 15 years of marine age. Prior maintenance records were minimal when I got the boat so I am in the process of establishing new basel…
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19 RepliesFebruary 14, 2018 at 7:56 pm Thanks guys. That is why I came to this site, to keep the newbies like me from making a major mistake. I will have to print some more $ and get the new elbows made. Would anyone have any recommendations on where to get this done on the east coast, Annapolis, MD? Tony, I know you guys can handle this job, any idea on how much you would charge for 2 custom elbows? Thanks in advance, SteveLast Post by:
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Sheared bolt inside C450 Turbo
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