Cummins Marine Diesel Repower Specialists Forums Cummins Marine Engines

This forum contains 883 topics and 5,575 replies, and was last updated by  Rob Schepis 1 hour ago.

Viewing 20 topics - 1 through 20 (of 883 total)
    • Cummins Marine Forum Topics
    • Another QSC Exchanger/Cooler thread

      This topic has 6 replies, has 3 voices, and was last updated by Rob Schepis 1 hour ago

      February 16, 2019 at 2:28 pm The motor is a 2007 QSC 8.3 500hp. About 1100hrs used in saltwater. No fresh water flush after use. So I finally got around to taking my cooler and exchanger apart. Pics below. I have a few questions. For the heat exchanger, the tubes seem pretty slimy on the anti freeze side. Is this normal? Will the acid bath take care of the crud in the second pic? I rodded the tubes and most of it was clean. the third pic shows what came out. In th…

      Started by:  Kyle G


      6 Replies
      February 20, 2019 at 8:04 am No need to replace. Once the cap is reinstalled the rubber will be captively held in place. You can use your glue of choice to hold it in place to aid in assembly if needed. Rob "Luck is the residue of good design."

      Last Post by:  Rob Schepis posted: 1 hour ago

    • Coalescing filter question

      This topic has 2 replies, has 2 voices, and was last updated by Kyle G 2 days ago

      February 17, 2019 at 10:34 am Did some searching on here and only found 1 thread that had limited info. I have a QSC 8.3 500hp. I took out the Coalescing filter for the first time. It has about 1100hrs on it. Are they serviceable? They are pretty expensive to replace. There is no indication on the gauge that it is pulling a vacuum. Should I wait until I notice that a vacuum is being drawn to replace? I have been cleaning the main filter once a year with the K&N f…

      Started by:  Kyle G


      2 Replies
      February 17, 2019 at 4:05 pm Do you / SBMAR offer any options to this setup? I don’t believe I saw any on the site but I could have missed it.

      Last Post by:  Kyle G posted: 2 days ago

    • Turbo’s,risers and HX’s

      This topic has 3 replies, has 3 voices, and was last updated by Dan 3 days ago

      February 15, 2019 at 6:43 pm In the lead up to hauling my boat Ive been chipping away at my riser to turbo bolts for six months,they have been on there since new in 06, with a bit of heat,lube some slight tapping , elbow grease and patience one by one they have come free except for one (on the bottom with very limited access) The boat came out of the water on Monday and I took both turbos and risers off, put a little heat on the last stuck bolt and it came free with some ch…

      Started by:  Dan


      3 Replies
      February 17, 2019 at 6:19 am Tony Athens wrote: I really hate to say this, but your turbo in the picture has eaten saltwater is the past for years.. It’s your call if you want to remove that possibility in the future,, Tony I knew that was coming…problem is what to do about it – the HX to riser raw water hose is touching the top of the hatch now on both engines (you can see the port engine HX to riser hose is flattened from this) and its all downhill to th…

      Last Post by:  Dan posted: 3 days ago

    • 6bta aftercoolers never serviced

      This topic has 2 replies, has 3 voices, and was last updated by Rob Schepis 3 days ago

      February 16, 2019 at 6:18 pm Can anyone share an opinion on exactly how far gone these aftercoolers appear to be. The motors are 2002 6bta 370s with 600 hrs each on them in saltwater. They push a 32 topaz owned by an older gentleman who wasnt big on maintenance. To me it looks like they have never been serviced. Maintenance records show just aftercooler zinc replacement. Owner suggested “they dont have enough hours on them” to need aftercoolers clean. I have re…

      Started by:  Doug franzoso


      2 Replies
      February 16, 2019 at 8:17 pm This is a pre-purchase inquiry? With that extended period of neglect they may even show signs of failure at the exteriors in the form of heavy corrosion or cracking of the housing, usually at the upper and lower areas where the end surfaces of the housing mate to the caps. That would prove to the seller he is dead wrong. Tell him you will pay to have them bench serviced and if they are servicable and pass pressure test all is good, if not his d…

      Last Post by:  Rob Schepis posted: 3 days ago

    • Aftercooler Seawater side scale- how clean is clean?

      This topic has 2 replies, has 3 voices, and was last updated by Rob Schepis 3 days ago

      February 16, 2019 at 9:39 am We have had the boat for one year. Bought it with 900 hours on 380hp QSB engines. Up to 1100 hrs now so we pulled starboard engine aftercooler to do clean and check, replace zincs, seals, etc. Found some scale on seawater outlet side(bottom) of tube core. We soaked core tubes for about an hour in 1:10 mix of CLR and water. Cleaned up and rodded tubes with an aluminum rod and copper brush (for a 9mm firearm). All tubes clear but there is stil…

      Started by:  Robert McManus


      2 Replies
      February 16, 2019 at 8:04 pm After you pour the solution in you can put a heavy weight on the core to help seal the base to the foam pad, a 5lb pound plate or similar.. Rob "Luck is the residue of good design."

      Last Post by:  Rob Schepis posted: 3 days ago

    • Exhaust insulation

      This topic has 6 replies, has 4 voices, and was last updated by Rob Schepis 3 days ago

      February 13, 2019 at 4:55 pm After learning (from this site) that my wet exhaust was configured incorrectly I built my own for my 370 6bta. I had a shop way up North do the insulation. They used fiberglass with sewn covers. After three years the stitching on the covers is coming loose and the fiberglass insulation is beginning to leak out. I temporarily wrapped it with fiberglass exhaust tape but I want something that is permanent. Any suggestions? This would only be the dr…

      Started by:  Tim Klassen


      6 Replies
      February 16, 2019 at 6:44 pm Here’s my port riser pics and wrap Rob "Luck is the residue of good design." Attachments:You must be logged in to access attached files.

      Last Post by:  Rob Schepis posted: 3 days ago

    • Oil Behind Water Filter

      This topic has 14 replies, has 4 voices, and was last updated by Mike Steward 4 days ago

      February 11, 2019 at 9:36 am I changed oil and filters this weekend ( A pair of Cummins 6CTA(s) in a 2001 Sea Ray 400 Sedan Bridge. On the portside motor I noticed there is some oil coming out behind the water filter. There seems to be a plate of some sort and oil had been coming out and landing on the top of the filter. I will try to get a photo. I also noticed after the oil change that the port motor is dropping to what looks like @10psi at idle. I plan on checking the ma…

      Started by:  Mike Steward


      14 Replies
      February 15, 2019 at 1:33 pm Yes. Thank you Rob. Mike Steward Sea Ray 400 Cummins 6CTA

      Last Post by:  Mike Steward posted: 4 days ago

    • 1999 6bta 315

      This topic has 11 replies, has 4 voices, and was last updated by Tony Athens 5 days ago

      February 9, 2019 at 2:17 pm I just purchased a 1999 6bta 315 for my boat. I am trying to find the serial number but am lost since there is not data plate. I need some help identifying where the sensors are and how to install the harness. It has a brand new set of Cummins gauges. Any help is appreciated. I have a video of it running. Will get some pictures of the sensors that are on it tomorrow. Thanks Attachments:You must be logged in to access attached files.

      Started by:  Andrew Piipponen


      11 Replies
      February 14, 2019 at 7:41 pm THIS has until wait until I look very close at a new sender: VDO 805/1/4 Max 120° ( I’m assuming Celsius?) 6-24v Made in Germany 288 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Your current wiring harness–Only YOU can answer that question–It all comes down to your capabilities as to following the Cummins wiring diagram and how good you are at cutting, splicing, etc etc wires as needed that need to work in a damp marine environment and on a boa…

      Last Post by:  Tony Athens posted: 5 days ago

    • 6bta Date Code

      This topic has 8 replies, has 3 voices, and was last updated by Tony Athens 6 days ago

      February 12, 2019 at 8:26 pm I assume this is a date code and serial number? Is it a 2008?? The boats a 2002 so the million dollar question…is it original? Attachments:You must be logged in to access attached files.

      Started by:  Brian Katz


      8 Replies
      February 13, 2019 at 6:11 pm Overall, your aftercooler looks really good, but for sure, it is related to the last water they saw before shut down and then, sitting at the dock for days, weeks & months on end… Use lots of grease during the assembly, and FRESH WATER FLUSH religiously if you are not parking the boat in water that you could use to water your lawn with.. Tony . Tony Athens Seaboard Founder Go here for the latest stuff we put together and share for…

      Last Post by:  Tony Athens posted: 6 days ago

    • Cummins 6CTA 450,8.3,8m 1 2 3

      This topic has 41 replies, has 8 voices, and was last updated by George Samaha 6 days ago

      October 24, 2017 at 4:15 am Morning, need some assistance. 2002, 1000 hours, 5 bladed prop, diameter and pitch unknown. Inter cooler serviced and gear cooler serviced in 2012, at 750 hours, report said seriously corroded, flushing and replacement of antifreeze done 2 years ago. WOT rpm unknown or at least that is what I am being told. Hot end of turbo and pipe and small part of inter cooler discolored light brown from heat, impeller ,oil , filters ,serviced regularly since…

      Started by:  Bill kosky


      41 Replies
      February 13, 2019 at 10:15 am Thank you Rob.

      Last Post by:  George Samaha posted: 6 days ago

    • Cummins 6CTA Synchronizer Instructions

      This topic has 1 reply, has 2 voices, and was last updated by Corey Schmidt 1 week ago

      February 12, 2019 at 12:24 pm Hi, I’m looking for the operating instructions for the circa 1997 Cummins 6CTA synchronizer. My shop manual does not discuss and I did not get an owner’s manual when I purchased the boat. Cummins did not have a manual. The installation manual calls it “C Cruise” . I have twin 6CTA-480CE engines with electronic engine controls. Thanks for any help Erik Sea Cottage

      Started by:  Erik Strasel


      1 Reply
      February 12, 2019 at 2:55 pm This is the closest thing I have, probably not exactly what you’re looking for but it’s better than nothing. Corey Schmidt | VP, Operations | Seaboard Marine, Inc. Attachments:You must be logged in to access attached files.

      Last Post by:  Corey Schmidt posted: 1 week ago

    • Cummins QSC 8.3 Aftercoolers 1 2

      This topic has 30 replies, has 6 voices, and was last updated by bdunigan 1 week ago

      February 20, 2018 at 8:07 pm Hi everyone. I’ve been reading some great information on this forum regarding the recommended aftercooler maintenance procedures for the Cummins 8.3. During my boat survey today of a 2012 Sabre 48 with 1400 hours on the QSC 8.3 engines I was told by the broker he does not believe the aftercoolers on this boat have ever been serviced. Today’s survey was just what we could complete with boat out of the water. I have my engine survey scheduled …

      Started by:  Bruce Van Fleet


      30 Replies
      February 11, 2019 at 11:29 am Tom: Best wishes for a speedy recovery. I did finally speak to a Sabre engineer about prop load on my 42SE. Here was his response: “Concerning propeller loading for your 42 Sedan with Cummins 6.7L 380’s, here’s what is best to strive for: Wide Open Throttle (WOT) underway should achieve rated rpm (3,000rpm), and preferably higher (3,050 +/- 25rpm) At rated rpm (3,000rpm), % engine load should be approximately 95% +/- 2% At 300…

      Last Post by:  bdunigan posted: 1 week ago

    • QSB Hose Replacement

      This topic has 3 replies, has 3 voices, and was last updated by Rob Schepis 1 week ago

      February 9, 2019 at 9:56 am The boat is a 2007 Sundancer 40 with QSB 5.9 425HP motors. Looking to replace hoses, particularly the intake/aftercooler/turbo hoses. (#2 in this picture: https://www.sbmar.com/qsb-5-9-engine-hoses/) as Ive noticed one hose starting to fray with apparent dry rot. Also thinking about replacing the cooling hoses as well, but not sure i want to tackle it yet as there is no visible cracking or dryness apparent and they feel good when squeezed. The j…

      Started by:  Eric


      3 Replies
      February 10, 2019 at 5:00 am QSB Coolant Drain. Photos like this and hundreds more like this are on the website and “searchable” Rob "Luck is the residue of good design." Attachments:You must be logged in to access attached files.

      Last Post by:  Rob Schepis posted: 1 week ago

    • 6CTA 480 secondary fuel filter install

      This topic has 10 replies, has 3 voices, and was last updated by Greg Weaver 1 week ago

      February 8, 2019 at 7:25 pm Hi all. So I have had my boat since early September, the previous owner was not running her much so I have been working on cleaning up the crap in the tanks. After purchasing the boat ” 35 Carolina Classic ” I purchased 12 primary filters because i knew i’d blow through them, and I have. 1st thing I did was have my main tank polished, we removed a fair amount of crud, pumped tank out and inspected with scope and look really g…

      Started by:  Greg Weaver


      10 Replies
      February 9, 2019 at 7:44 pm Just came from the boat. 33 degrees out now Engine room right at 58 degrees with Wolverine 250’s running 24/7 Disconnected POS and NEG from heater grid at manifold Key to on position and zero faults like Tony said. Fired engine up and smoked no more than it usually does. Voltage running was 13.80 If this is the wrong way to temporarily disable the heater grid Please, please chime in. Once my fingers heal and it warms up some, I will comple…

      Last Post by:  Greg Weaver posted: 1 week ago

    • AirSep / Turbo Concerns

      This topic has 2 replies, has 3 voices, and was last updated by Mike Pettee 1 week ago

      January 20, 2019 at 6:10 pm I bought a 2004 Meridian 411 with Cummins 370 6bta motors that are now showing around 1300 hours in the summer of 2018. The boat seems to run good however i have begun cleaning it up and making it mine by doing following suggestions and upgrading/fixing apparent problems. Now bare with me, this is my first diesel and I am learning as much as i can while often asking silly questions. I started doing some maintenance work yesterday and during th…

      Started by:  Brad Fausett


      2 Replies
      February 9, 2019 at 3:49 pm My turbos on my 370s look about the same. I have no external leaks though. After reading on here my next upgrade is the CCV systems (and 160 thermostats). 1990 Blackfin 32 Combi. Cummins 370s 2006 Scout 190 Costa/Mercury 225 ProXS

      Last Post by:  Mike Pettee posted: 1 week ago

    • QSB Man Overboard Killswitch Wiring

      This topic has 14 replies, has 4 voices, and was last updated by Robert Vetrano 1 week 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. I’ve been in touch w Fell tech support but am not getting all the answers I need. I’ve se…

      Started by:  Robert Vetrano


      14 Replies
      February 8, 2019 at 3:02 pm Corey Schmidt wrote: Rob Schepis wrote: Why would you have to re-engineer the system…surely you are not the first twin engine user. Did you buy a single engine version and the twin engine version comes with a different control unit? I am not at all familiar with the product but just speaking as to what makes sense.. Any way to furnish a simple wiring schematic of the MOB system? It really should be very straight forward to wire this thing …

      Last Post by:  Robert Vetrano posted: 1 week ago

    • 6CTA Coolant leak on top of exhaust manifold 1 2

      This topic has 34 replies, has 7 voices, and was last updated by firehoser75 1 week ago

      January 23, 2019 at 9:07 pm Hello, I’m hoping to get some advice regarding a coolant leak that I noticed today while checking on my boat. I have a 1999 Formula 41pc fitted with twin Cummins 6CTA Diamonds. After the cold snap that we just had in Philadelphia I decided to check on the boat as it is on the hard for the winter. During my inspection in the engine room, I spotted engine coolant resting ontop of the port exhaust manifold. It appears to be coming from some typ…

      Started by:  Bob Foster


      34 Replies
      February 7, 2019 at 12:17 pm Tony, I too just serviced my aftercooler (and other items) thanks to all the info that you, Rob, and all of the members of this forum provide freely to us mechanical “newbies”. YOU GUYS ROCK! Thanks again, Tom

      Last Post by:  firehoser75 posted: 1 week ago

    • Fresh Water Cooler For Cummins 6CTA 8.3

      This topic has 2 replies, has 2 voices, and was last updated by Md. Dildar Alam 1 week ago

      February 6, 2019 at 6:44 pm Hi, I am new here and new in business. Our business is supplying spare parts. One of our clients required Fresh Water Cooler For Cummins 6CTA 8.3. But he did not give me accurate Part #. So anyone can help me what is the Part # of Fresh Water Cooler For Cummins 6CTA 8.3. He gives me a Part # 4029855, Engine Serial # 21297467. Anyone can help, please? Dildar

      Started by:  Md. Dildar Alam


      2 Replies
      February 7, 2019 at 11:03 am Hello Tony, Many thanks for your quick reply and suggestion. I am asking my client to give me the information. I am searching for the product for my online client from Bangladesh. Thanks again. Dildar

      Last Post by:  Md. Dildar Alam posted: 1 week ago

    • Cummins QSC 8.3 mechanic survey

      This topic has 5 replies, has 3 voices, and was last updated by jeff p vargas 2 weeks ago

      February 4, 2019 at 9:08 pm I just went into contract to purchase a 2008 – 50 ft Sea Ray with Cummins QSC 8.3 engines with 500 hours. The boat is in San Diego – Shelter Island. I’m looking for a reputable mechanic in the area to check out the engines and generator very thoroughly. Need to get this done in the next 2 weeks. You guys are the experts and I’d love to get one of you out to do it but if not, can you recommend someone that is trustworthy? …

      Started by:  jeff p vargas


      5 Replies
      February 5, 2019 at 8:54 pm Thanks Mike, I’ll give you a call in the morning.

      Last Post by:  jeff p vargas posted: 2 weeks ago

    • R/w pump location move?

      This topic has 15 replies, has 3 voices, and was last updated by Mark Tripi 2 weeks ago

      January 28, 2019 at 11:18 am Good day fellow diesel owners. My boat (1999 Pursuit 3000 Express) is powered by twin Cummins 4 BTA-250 engines with Sherwood r/w pumps. As you know these pumps have a bad reputation. getting to them in the boat is next to impossible if you are not 90 lbs and very short. Next spring my wife and I are going to do some longer distance cruising and I want to make the boat as reliable and easier to maintain as possible. Toward that end the engines a…

      Started by:  Mark Tripi


      15 Replies
      February 5, 2019 at 9:49 am I am close to solving this. But I need a crankshaft mounted pulley for an “A” v belt, 7-8 inch diameter that is 3-4 inches off the face of the balancer. I can mount a Jabsco facing backward and run it with a pulley. Any ideas on that?

      Last Post by:  Mark Tripi posted: 2 weeks ago

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