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- Cummins Marine Forum Topics
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QSB Man Overboard Killswitch Wiring
This topic has 17 replies, has 5 voices, and was last updated by
5 months ago February 4, 2019 at 4:50 pm Hi, I bought a Fell Marine MOB+ wireless man overboard system for my Meridian w twin QSBs. The goal is to kill the motors if I go in the drink, and have an alarm go off if the Admiral or the dogs go in. The system seems to be built for outboard boats primarily……but I gotta think it can be wired in to my existing start stop switches. Iāve been in touch w Fell tech support but am not getting all the answers I need. Iāve seen t…
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in: Cummins Marine Engines
17 RepliesDecember 18, 2023 at 8:15 am I found this tread regarding the same question I have so I pull it up again. I bought the Fell Marine MOB+ for my actual 30ft single engine RIB for the same reason OP Robert wrote, but in my case as I boat often alone and I guess its a uncomfortable situation falling over word and see the boat leaving. Any else who managed to install the Fell Marine MOB+ (or any other similar wireless kill switch as the ACR Olas Guardian)?<br />If so, how …Last Post by:
posted: 5 months ago
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Have these 6BTAs been upgraded to 370hp?
This topic has 8 replies, has 6 voices, and was last updated by
1 year ago
August 5, 2020 at 5:41 pm Buddy bought a boat. Tag on the motor says 6bta 330hp. But in neutral we got around 3100rpms. Spec for a 6bta 330 shows 2800. Assuming the tachs are ānearā correct. Is there a sure fire way to tell if these motors have been upgraded?
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8 RepliesJanuary 18, 2023 at 4:11 am Hi there, so been trying to research the question of if somebody was to recalibrate from 330 HP to 370 HP for what ever reason.Ā <br />Iāve bought the Cummins marine CPL1975 /2208 Manuel from SBMar (thank you guys) and started to compile a list of parts and jobs to complete the conversion?? it seems like this is a common question but no one out there gives a straight answer Ā so can the SBMar experts please come to the rescue on this?Last Post by:
posted: 1 year ago
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Aftercooler protocol progress
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This topic has 39 replies, has 10 voices, and was last updated by
3 years ago April 26, 2019 at 1:13 pm Iāve sent Tony Athens these same pictures for review, but wanted to get a thread going with my progress for all to see. Twin QSBs. ACs have been serviced 1x by a previous owner (there were 4). I donāt believe they removed the AC and bench serviced. Iāve only done my stbd AC at the moment. Slight green corrosion on both caps. No performance issues pointing me to any problems. Caps came off easily as expected. Top zinc was mostly intact …
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April 26, 2021 at 11:57 am Roky, you could always give distilled white vinegar a try too. My last aftercooler service interval was rather short so tubes weren’t bad and the vinegar cleaned them up nice.
39 Replies
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posted: 3 years ago
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Freshwater flushing, worth the effort?
This topic has 16 replies, has 10 voices, and was last updated by
3 years ago February 23, 2021 at 5:11 am For those sitting on the fence about doing it, I thought I should share this. I just pulled one of my aftercoolers, 16 years old, 3.5 years since last serviced,100% salt water use, freshwater flushed after every use – been flushing since they where new. Pulled the caps and the core slid out without any effort, not one tube was blocked. Pics 1 to 4 taken as it was disassembled, everything still covered in metalube, pics 5 to 9 taken after c…
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in: Cummins Marine Engines
16 RepliesMarch 6, 2021 at 10:10 am And there are still those that do not believe in fresh water flushing & using the proper assembly practices & grease starting from DAY 1 .. Compliments of Bill Fuller ( Yanmar 4LHA 230’S) .. He listened to me 21 yrs ago.Last Post by:
posted: 3 years ago
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Fuel cooler leak, a cautionary tale
This topic has 5 replies, has 4 voices, and was last updated by
3 years ago
February 10, 2021 at 2:40 pm Just wanted to share a piggyback story to my other post about flushing my seawater circuit. I did that this weekend. Ran the boat yesterday and got a few water in fuel warnings on the smartcraft. Racor was full of water on 3 occasions. Long story short…..I pulled my seawater hose off the fuel cooler and there were red diesel droplets in the water. I guess I can only attribute this to the acid flush loosening up some corrosion on t…
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5 RepliesFebruary 10, 2021 at 6:02 pm Thanks Tony, New coolers already on the way. How does one test for a restriction?Last Post by:
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QSB HX zincs broke off, acid flush HX?
This topic has 7 replies, has 4 voices, and was last updated by
3 years ago February 5, 2021 at 1:12 pm Twin QSBs. Freshwater flush installed and used religiously (installed Spring 2020, after the sbmar seawater protocol which I did Summer 2019) I was changing out pencil zincs and both the HX zincs broke off, and thereās some clogging of the HX tubes at the bottom, with the built up zinc material. Canāt get to the tubes with a rod, should I just do an acid flush of the seawater circuit to clean that up? Or leave it be? Temps have been rock s…
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7 RepliesFebruary 8, 2021 at 8:17 pm Sounds good.Last Post by:
posted: 3 years ago
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Why does my diesel boat have bilge blowers?
This topic has 6 replies, has 6 voices, and was last updated by
3 years ago January 7, 2021 at 10:21 pm My Cummins powered Meridian has 2 bilge blowers in between the engine room and lazarette on the stbd side. They are failing. Why are these used on a diesel boat, and when should I use them? (Iām fully aware of the reason and usage for gas boats). Is it for engine room cooling? While running or back at the dock?
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6 RepliesJanuary 10, 2021 at 7:37 am Underway during a looooong no wake zone when heading back to the slip and then continued after engine shutdown.Last Post by:
posted: 3 years ago
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QSC 8.3 After cooler Test
This topic has 5 replies, has 5 voices, and was last updated by
3 years ago
December 24, 2020 at 11:31 am I have read the archives and used Rob’s pictures to build a copy of his after cooler test fixture to pressure test the after cooler on our 2008 QSC 8.3. I used 1/2″ aluminum plate & 3/8″ thick neoprene for the end seals and drilled a 7/16″ hole for the compressed air to enter the cooler core. I have attached a picture of my fixture. When I pressurize to 20psi, I get leakage between the gasket & the plate. I have…
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in: Cummins Marine Engines
5 RepliesDecember 26, 2020 at 3:49 pm Thanks for all the replies! This morning i went back to work on it and found that the schrader valve I used was leaking too after spraying soap water on it. I replace it and then snugged up on the nuts a bit more. It held 15psi for 6 hours so I called it good and will reinstall in the housing tomorrow.Last Post by:
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Do most QSBs have mufflers?
This topic has 13 replies, has 4 voices, and was last updated by
August 14, 2020 at 7:46 am Twin QSB 5.9s. Meridian 391. Underwater exhaust. Do most boats come with mufflers? Is it a cost thing as to why Meridians didn’t come with them from the factory? My boat is a little loud. I added Centek mufflers to my idle bypass line, thinking that was where most of the noise was, and they didn’t do a whole lot. (3″ in/out, 6″x11″). I have about a 6′ run of 6″ exhaust hose from the mixer with ro…
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13 RepliesNovember 19, 2020 at 10:57 am Thoughts on this, Tony?Last Post by:
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Starting my freshwater flush setup
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This topic has 28 replies, has 10 voices, and was last updated by
3 years ago April 2, 2020 at 4:27 pm Starting my fwf finally after talking about it for too long. My system is ok for an engine off system and will tap into the OUT port on my seawater pump. Manifold is all Home Depot stuff and will be installed in my transom locker with a quick disconnect for the dockside garden hose. I used 3/4ā braided hose from Amazon to run to my engines, and it will reduce down to 5/8ā hose and then into the 1/4ā NPT fitting on the pump. The goal is …
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September 29, 2020 at 11:34 am Thanks Rob for the quick reply. 28 Replies
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posted: 3 years ago
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Fresh water flush system for QSM-11 How To?
This topic has 6 replies, has 4 voices, and was last updated by
4 years ago
December 31, 2019 at 2:23 pm Just finished with bench service on all of my coolers and heat ex changers. $$$ Meet a guy with twin 3208’s and he showed me his design of his fresh water flush system. He said he was a maintenance engineer for NASA. When he pulls into his slip after a run he just connects his boat up to the fresh water supply at the dock with the hose. Inside the engine room he has connected two lines to the fresh water system that run to a solenoid …
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in: Cummins Marine Engines
6 RepliesJanuary 6, 2020 at 6:16 pm Robert/Clark, I did respond to your questions but the post failed to come up, will resend it when Im back on my computerLast Post by:
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Would this manifold work for FW flushing?
This topic has 2 replies, has 3 voices, and was last updated by
4 years ago January 1, 2020 at 10:49 am I found this on Facebook and it looks like a nice clean solution to flushing my mains, gen and AC. Problem is itās only got 1/2ā ports. Would 1/2ā ports allow enough water flow to flush in an engine-off flush setup? (Iāve verified my boat is a candidate for engine off flushing). My existing FW setup goes to my AC and gen, and is bigger hose…..more like 5/8 or 3/4 if I recall.
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2 RepliesJanuary 2, 2020 at 12:35 pm Rob, Two teenage daughters out on the boat with you and your wife?? You have my sympathies š Happy New Year to you and your family! Tom Robert, Sorry for the thread drift, but I just couldn’t help myself šLast Post by:
posted: 4 years ago
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Simultaneous freshwater flush twins?
This topic has 2 replies, has 3 voices, and was last updated by
4 years ago August 29, 2019 at 12:38 pm Iāve established already through this forum that my exhaust is all downhill, and I can hook up a FWF setup into the port on the seawater pump for engine off flushing. Can I flush 2 motors at the same time with dockside water pressure? It sure would make plumbing easier as I already have a single line running up to my AC seawater pump and genny that Iād like to tap off of. Also, sidebar, I just finished removing my entire seawater circuit…
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2 RepliesNovember 5, 2019 at 11:00 pm I flush the engines simultaneously. Dock water pressure is pretty decent. Since the very first time I tried it I make sure that there is adequate water flow out the exhaust. I also feel the back of the raw water pumps to make sure that neither are warm. They have never been warm. A am confident that there is plenty of water flow. I tend to let the flushing procedure go a bit longer (4-5 minutes) to ensure that there is nothing but fresh w…Last Post by:
posted: 4 years ago
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Exhaust blanket soot
This topic has 8 replies, has 3 voices, and was last updated by
July 12, 2019 at 1:56 pm My stbd QSB 5.9 exhaust blanket has some black soot on it. Hasnāt changed much since Iāve owned the boat. Iām away from her at the moment but plan on taking the blanket off and replacing the tabs as theyāve broken. Is this pretty indicative of an exhaust leak? Either on the riser or turbo flange? Or just normal?
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8 RepliesJuly 14, 2019 at 7:28 pm Interesting, i had no idea!Last Post by:
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Aftercooler bundle condition
This topic has 2 replies, has 2 voices, and was last updated by
April 20, 2019 at 3:40 pm Hi; just pulled my stbd AC to make them the sbmar way. Coolers came apart with between minimal and some effort. Not much grease that I could tell…..but they came out ok. Been through most of the cleaning steps so far and just wondering about 2 things at this point…. A) this slight pitting on the bundle? Normal? Concern? Sand some more? B) just sand and grease the housing where the black paint is missing on the inside? Thanks!!…
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2 RepliesApril 20, 2019 at 4:11 pm I found similar pictures (after I posted of course) and read the same. You also said in that thread lube it up and put it together and itās fine, so Iāll go with that upon successful pressure testing.Last Post by:
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Aftercooler bundle pressure test setup
This topic has 6 replies, has 4 voices, and was last updated by
5 years ago March 24, 2019 at 12:26 pm Quick one……would 1/2ā Starboard suffice on each end of the bundle w a gasket, and 4 threaded rods to tighten, for pressure test purposes…….or should that be a steel plate on each end?
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6 RepliesApril 11, 2019 at 2:43 pm Ah, very good point on the “stored energy” issue. How about if I fill the water side nearly to full with water first, then air pressurize to 15 psi and see if it holds overnight…, would that be a thorough test?Last Post by:
posted: 5 years ago
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Freshwater flush setup question
This topic has 10 replies, has 3 voices, and was last updated by
5 years ago March 6, 2019 at 1:54 pm After my upcoming raw water side servicing, I’d like to set up a FW flush for the motors. I have an existing setup for the Gen and AC. I’d like to use the sbmar tee that I see advertised for this setup. My question is, can regular hardware store brass items be used on the transom/freshwater side leading up to the sbmar tee? Or should all the plumbing be bronze (read…..expensive, lol) fittings? Thanks!
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10 RepliesMarch 17, 2019 at 1:52 pm Flushing Water has to enter the OUTSIDE of the pump for a “engine not running” system.. TonyLast Post by:
posted: 5 years ago
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HX and Gear oil cooler servicing….
This topic has 3 replies, has 2 voices, and was last updated by
5 years ago March 6, 2019 at 9:27 am I’ve read the aftercooler service article, forum posts, and watched the vid….I’m pretty set on that. Will someone direct me to literature for servicing the HX, gear, and fuel coolers? Or are those just basically rod them out, bathe them in 10:1 pool acid, and pressure test them? Thanks! Twin QSB 5.9, 380HO
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3 RepliesMarch 7, 2019 at 6:21 am Rod out the tubes as you can– a 1/8″ dia aluminum “TIG” rod works great.. Remove the zincs, Cap one end, and stand vertical, Fill the “tube side” with 10:1 for 30-60 minutes and rinse..You will see “bubbles” as it acid dissolves the calcium lime, old zinc, etc. TonyLast Post by:
posted: 5 years ago
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QSB 5.9 extended slow speed cruising…..
This topic has 5 replies, has 4 voices, and was last updated by
January 14, 2019 at 2:48 pm I have twin 5.9 380s. Some friends are doing a paddleboard charity this summer, paddling from Bimini to West Palm. 80nm. Yes, theyāre crazy. I will be their support vessel. Iām expecting this to take about 12-14hrs. Are there any concerns with going this slow for this long? Iāll likely have to be idling, or slightly above, for the whole crossing. Should I run up on plane 1x per hour or something like that? Thanks!
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5 RepliesJanuary 15, 2019 at 7:16 pm Can do! Thanks Tony!Last Post by:
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Above prop curve at some RPMS
This topic has 6 replies, has 5 voices, and was last updated by
5 years ago October 18, 2018 at 12:21 pm Hi, Been reading and educating myself a lot about overpropping and prop curves per articles and forum posts. I ran a GPH log on a trip this weekend on our 08 Meridian 391, 650hrs, 23×26 props, Full fuel, Full water, myself and the Admiral, 2 Golden Retreivers, and all our crap for a 4 day trip. I found that I was above the prop curve from 1600-2800rpms…..and then right on it at WOT. I made 3000rpm on the trip down, and slightly ab…
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6 RepliesOctober 20, 2018 at 4:09 am This is how I answer a difference between P&S engines and what the gauges tell you.. TonyLast Post by:
posted: 5 years ago
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QSB Man Overboard Killswitch Wiring
