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SMX Double Double Quantum Fuel Filter Change..Thought I would Share
This topic has 0 replies, has 1 voices, and was last updated by 1 week ago
April 15, 2024 at 3:32 pm Sharing with the forum the importance of keeping any crud or water out of the “last chance” fuel filter on the QSB.5.9 480. I cut the filters open to look over the filter media and inside the cannisters. OK, I’m running a QSB 5.9 480…just turned 305 hrs over 2.5Ā summer seasons. I use Biobor JF as preventive maintenance dose. Full disclosure I do not rountinely or at allĀ drain the bottom of the filters to check for water…
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in: General Discussion
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6CTA Air Filters – 2 part question
This topic has 5 replies, has 5 voices, and was last updated by
2 weeks ago
April 5, 2024 at 9:32 am Looking to either service or replace my air filters… SN 46309849 SBMar store states S&B Air Filters DO NOT replace Walker Air-Sep filter elements. I don’t know what a Walker Air Sep filter is.Ā Current one has a metal end cap and some holder springs..Ā Second part – I highly doubt the air filter has ever been changed in the life of the boat.Ā How much of a service item is this really for people?Ā Is this a regular se…
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in: Cummins Marine Engines
5 RepliesApril 8, 2024 at 2:40 pm The Walker Air Sep is intended to separate the oily vapour ejected from the crankcase from the actual air flow so the oil can be discarded without fouling the air filters s0Ā quickly. Seaboards’Ā crankcase venting is another way to do the same thing.Ā Ā Look it up.Last Post by:
posted: 2 weeks ago
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Sharing QSB 5.9 Freshwater Flush Zincs
This topic has 3 replies, has 3 voices, and was last updated by
3 weeks ago April 3, 2024 at 11:17 am Hello forum members, I figured I’d share the pictures of the three zincs removed from the QSB 5.9 480 after a five month summer season up here in Kittery Maine. I was diligent in freshwater flushing the engine after each use. Total hours on the season was +- 150 hrs. burning 4 gal/hr on the season. From L to Right: Bottom of after cooler…..Top of aftercooler….Heat exchanger. Note the degradation in the bottom aftercooler zinc&#…
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in: Cummins Marine Engines
3 RepliesApril 5, 2024 at 8:36 am 100% freshwater hose blasting away through the T adaptor with engine seacock “closed in the video” and engine running. About halfway through the season I flushed with seacock “open”. It was a bugger reaching down and closing the 2″ seacock and then re-opening. I also think the zincs look normal. Prop shaft & rudder zincs (Godfrey brand, not cheap Camps) about 70% consumed, no complaints. The proof of the results…Last Post by:
posted: 3 weeks ago
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Sudden loss of oil pressure
This topic has 4 replies, has 4 voices, and was last updated by
4 months ago December 11, 2023 at 6:20 am I have a 97 Pursuit with twin 370 hp 6bta engines with approximately 1350 hours. I was running it yesterday and slowed to go through the wake of a large motor yacht (intracoastal in Florida). When I went to accelerate I heard a loud pop and lost oil pressure in the port engine. I shut it down and limped home. When at the dock I turned on the electric pump I installed to pressurize the system before I start them and it had its normal 30psi, so th…
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in: Cummins Marine Engines
4 RepliesDecember 21, 2023 at 6:32 am Start with a solid installation of a quality liquid filled 0-200 PSIĀ mechanical oil gauge on a hose whip that you can monitor when running the engineLast Post by:
posted: 4 months ago
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Cummins Aftercooler Servicing
This topic has 5 replies, has 4 voices, and was last updated by
5 months ago September 12, 2023 at 6:56 am Hello, Just started servicing my aftercoolers (Tony’s way of course) and found pitted corrosion inside the housing. Ā The surface area where the end caps join are fine but just inside the lip there is pretty significant pitted corrosion. Ā Is my housing toast? Ā Where does the o-ring seal the seawater from airside? Ā Will the pitted corrosion result in seawater leaks to airside? Ā Thanks!
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in: Cummins Marine Engines
5 RepliesNovember 17, 2023 at 10:47 am Tom, I’ve serviced the same after cooler as yours on my engines for the past 15 years the Seaboard way. I service the coolers every three years. This is after making sure the cooler is greased up the Seaboard way to begin with. The more grease the better IMO. I pressure tested the first one serviced with my own made up pressure test contraption. Since the first one serviced,Ā I have not pressure tested since. And have not had any issue wit…Last Post by:
posted: 5 months ago
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Qsb6.7 engine throttle sensor fault.
This topic has 4 replies, has 3 voices, and was last updated by
5 months ago October 12, 2023 at 4:15 pm It’s on a commercial 29 ft h&h . Install was done around 2017. Cummins west did the final setup and install. Ā fault comes on with alarm very consistent. Controls work. Engine runs Perfect shifts and rpm goes up and down with no issues. Smart craft controls. Ā any help and direction would be great.Ā
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in: Cummins Marine Engines
4 RepliesNovember 17, 2023 at 10:29 am Certainly can’t complain about the 6.7 though. Plus 5,000 hrs.Ā I have the 27 H&H, smaller bro of the 29, with a QSB 5.9 480…. The H&H line of downeast boats are very good keel boatsĀ Good luck with fixing your engine control issue.Ā Regards,Ā Bill DLast Post by:
posted: 5 months ago
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Freshwater Flush Winterization of QSB 5.9 480 with raw Water Alarm
This topic has 1 reply, has 2 voices, and was last updated by
5 months ago October 8, 2023 at 7:39 am Informational post: I’ve made a habit of freshwater flushing the engine @ the dock after each use. I don’t use a bucket at the dock, just a quick disconnect on the freshwater hose and hose under the washrail. Boat is hauled for the season. First video is the 6th of five gallon buckets of freshwater flush thru the Cummins. Second video is seven gallons of non-tox for winterization. Note how quickly five gallons of liquid pumps through…
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in: Cummins Marine Engines
1 ReplyNovember 17, 2023 at 7:11 am good job!Last Post by:
posted: 5 months ago
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House Batteries Not Charging
This topic has 18 replies, has 8 voices, and was last updated by
September 29, 2023 at 2:17 pm Engine is a single 6BTA.Ā Looks like the alternator is not charging the house batteries.Ā Here is the scenario:Ā When I am running on the generator and the battery charger is running, there are no electronics issues.Ā If the generator is shut off and the engine is running, after a couple hours, the house batteries appear to start to go down and the first symptom is that I start to lose my troll function on my Glendinning controls, likely due to …
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in: General Discussion
18 RepliesOctober 27, 2023 at 4:28 pm Glad you found it an it was simple.Last Post by:
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QSB 5.9 Operating Temp 210Ā°
This topic has 10 replies, has 9 voices, and was last updated by
7 months ago
September 11, 2023 at 12:55 pm A guy I know has a 39 SeaRay with QSB 5.9 380 motors. Ā At speeds above 18 knots he gets an overheat alarm. Ā Engines are at 210Ā° at 18 knots cruise speed (verified with laser therm). Ā His mechanic tells him 210Ā° is normal for that motor and he thinks the overheat alarm is due to a bad sender. Ā The local Cummins dealer says trucks are running that motor at 210Ā° all day long. Ā Is an operating temp of 210Ā° normal for this motor? Ā 210Ā° seems high to…
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in: Cummins Marine Engines
10 RepliesSeptember 27, 2023 at 7:23 am He is crazy. I had that same boat, if itĀ is a Sundancer, and after servicing everything, as mentioned by Steve, I ran that boat at 25-26 mph all day long and never saw temps above 180. I bet his EGT is off the charts.Last Post by:
posted: 7 months ago
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6BTA fuel filter change out vacuum pressure
This topic has 9 replies, has 4 voices, and was last updated by
7 months ago September 11, 2023 at 8:28 am Iāve got a pair of 6BTAās each with SMX Double Double fuel filters plus the stock on engine fuel filter. Iāve had the system for about 6 years. I happened to read an article about fuel systems having too much pressure drop. The Cummins specs for my engines refer to a max dirty pressure drop of 4āhg. That seems very low. I donāt think my filter pressure drop is that low with clean filters. The gauges donāt go into the red until 10ā. What is the a…
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in: Cummins Marine Engines
9 RepliesSeptember 18, 2023 at 5:12 pm Quantum Double/Double between the twin fuel tanks and the QSB 5.9 480. From launch of boat after repower with the QSB. Clean tanksĀLast Post by:
posted: 7 months ago
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Heat Exchanger Kit QSB5.9
This topic has 4 replies, has 4 voices, and was last updated by
7 months ago
September 10, 2023 at 12:19 pm Hello, I am going to change the exchanger kit https://www.sbmar.com/product/6-cummins-qsb-5-9-425-480-hp-heat-exchanger-kit/ for the first time, could you tell me how to proceed? I couldn’t find any video on the net. Thank you so much JohnĀ
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in: Cummins Marine Engines
4 RepliesSeptember 16, 2023 at 4:10 am Some might disagree with me on this but I believe scale removal is at least just as important as crud removal(within limits).Ā I would consider a flow set up thru the raw water side of HX with a continuous flow of barnacle buster for a couple of hours to remove any scale build up.Last Post by:
posted: 7 months ago
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FW flush… Doomed to fail exhaust? 5.9 QSB
This topic has 4 replies, has 4 voices, and was last updated by
7 months ago September 3, 2023 at 7:22 am See attached pictures.Ā Is my exhaust doomed to fail?Ā I’d like to install the freshwater flush, ideally AFTER the water pump so I can flush with engine off.Ā Think I’m ok?
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in: General Discussion
4 RepliesSeptember 10, 2023 at 4:05 pm Your exhaust looks well designed. Tony’s crew built the custom exhaust for my QSB 5.9 480 lobster boat install. All from 3,000 or so miles away !Ā 17″Ā above the static water line gravity drain at dockĀ ĀLast Post by:
posted: 7 months ago
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QSB 6.7 aftercooler maintenance interval vs. 5.9
This topic has 12 replies, has 5 voices, and was last updated by
9 months ago
December 11, 2020 at 3:39 pm Any thoughts on whether there is any difference in the maintenance interval of the vertical 6.7 aftercooler, vs, the horizontal 5.9 aftercooler? In particular the maintenance Iām referring to is pulling it apart, cleaning, lubing, new prints, gaskets, etc. Thanks for your thoughts.
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in: Cummins Marine Engines
12 RepliesJuly 24, 2023 at 6:58 am Tony, Did you see the serial numbers?Last Post by:
posted: 9 months ago
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Turbo Coolant Feed Pipe: "slop" normal?
This topic has 4 replies, has 4 voices, and was last updated by
11 months ago
August 18, 2017 at 8:39 pm I’ve bought a set of new engine hoses from Brad for my 6BTA 370, including a turbo coolant return hose. On installing this, I found some ‘slop’ or wriggle in the “water transfer tube” (CN # 3897088) this hose slips onto at the engine end. Looking at a QuickServe diagram, I can see that this tube is held in with a clamp and O-ring. The clamp nut is tight-as and there is no sign of a leak. Can someone tell me if …
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in: Cummins Marine Engines
4 RepliesJune 1, 2023 at 11:21 am Hello , and thanks for this forum, Does Tony’s answer apply to my 6BTA 250HP? I changed Turbo coolant return hoses on both engines.Ā The Stbd was tight but no problems. The port hose was really tight, and even with heat and soap it took a lot of force. It Stull was only needed another 1/2 inch to be perfect when the return pipe moved and exhibits this slop.Ā The retainer bolt is tight. I am thinking of removing it and repla replacing the O…Last 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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QSB 5.9 oil change fitting type
This topic has 2 replies, has 3 voices, and was last updated by
1 year ago December 17, 2022 at 2:30 am Hi All, Does anyone know what the fitting type/size is on the oil drain hose on a QSB 5.9Ā – That is the one on the blue hydraulic line that comes out of the sump plug. The engines are in a Meridian 411. I am looking to set up an oil change kit and want to buy the female fitting for my change kit so I can just plug in to the existing line. Photo attached, please ignore the surface rust, it needs an appointment with the wire brush ! Cheers …
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in: Cummins Marine Engines
2 RepliesDecember 20, 2022 at 9:42 am “smart” on the heak shrink ideaLast Post by:
posted: 1 year ago
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QSB 5.9 Fuel Cooler Removal and SMX Kit..Anyone ??
This topic has 3 replies, has 3 voices, and was last updated by
1 year ago October 30, 2022 at 8:01 am Good day, Considering removing the fuel cooler on my QSB 5.9 480. Has anyone on this forum removed the fuel cooler off of their QSB 5.9? Any performance issues or any issues going forward after removal ? Thank you, Bill DĀ
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in: Cummins Marine Engines
3 RepliesNovember 5, 2022 at 6:23 pm I would think it would be as simple as taking the 2 lines off the cooler and connecting them together.ĀLast Post by:
posted: 1 year ago
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Engine Flush Question
This topic has 3 replies, has 3 voices, and was last updated by
1 year ago September 6, 2022 at 5:33 am I now flush my twin QSB6.7 425 units after each run…5-7 minutes each. SB flush caps on the sea strainers. I have noticed that the cool fresh water really cools the heat exchanger and after cooler.Ā Is there any chance this quick swing from hot to cold can stress/damage/crack these components?
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in: Cummins Marine Engines
3 RepliesSeptember 16, 2022 at 7:16 am I freshwater flush my QSB 5.9 480 after each use. The engine is generally shutdown 20-30 mins before flushing. I cannot see in my mind’s eye why a 30 degree difference in water temp coursing through the SWAC side of the engine could be create a thermal issue. I can’t sleep if I don’t freshwater flush after each use. šLast Post by:
posted: 1 year ago
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1st Oil Change QSB 5.9 480 Questions
This topic has 5 replies, has 3 voices, and was last updated by
1 year ago September 11, 2022 at 2:10 pm Questions Is the oil pan front drain plug/magnet removal going to take a considerable amount of oooomph? Think a 1/2″ hand rachet with a 3/8’s male suffice or will I need something more like a short breaker bar? Thanks Bill D
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in: Cummins Marine Engines
5 RepliesSeptember 15, 2022 at 2:21 pm Thanks for the replies gentlemen ! The QSB 5.9 in my boat has a Wolverine oil pan heater pad plugged in 24/7 when the boat is in the water. The engine also has a factory drain hose on the bottom aft of the oil pan. My engine install is about dead flat level at the dock. Very little oil came out of the front magnet plug as expected.Ā Ā I have used a Jabsco Water puppy with neoprene impeller for years pumping oil. Makes a real quick pump out…Last Post by:
posted: 1 year ago
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SMX Double Double Quantum Fuel Filter Change..Thought I would Share
