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Viewing 20 topics - 1 through 20 (of 964 total)
    • Cummins Marine Forum Topics
    • Sheared bolt inside C450 Turbo

      This topic has 17 replies, has 7 voices, and was last updated by kknoth007 2 hours ago

      January 30, 2017 at 8:54 pm Hi SB crew I have a Riviera 4000 offshore express on Gold Coast, Queensland which features 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 was not hard and last couple of runs before this discovery we were only doing a leisurely 10 knots or 1100rpm…

      Started by:  Mark Theyer in: Cummins Marine Engines


      17 Replies
      Reply #17 August 16, 2018 at 11:01 am We had our turbos done by a local guy who has a cnc machine. he cuts out old crap in housing and presses a sleave into housing. like new. He even closed the gap between the wheel and housing increasing boost for free power (there is some gap needed for expansion)! This is in south florida but maybe somebody local can do same?

      Last Post by:  kknoth007 posted: 2 hours ago

    • How much blow-by is excessive?

      This topic has 0 replies, has 1 voices, and was last updated by Jen Wren 5 hours ago

      August 16, 2018 at 7:43 am I have a pair of QSB 380 motors with 11,000 hours on them. We service them EVERY 100 hrs. using Fleetguard fislters and Delo 400 15-40 oil. EVERY season the heat exchangers and after-coolers are removed and service on the bench per Tony’s protocol. This winter I removed the Airsep air filters, plugged the lines and ran a hose from the vent on top of the valve cover to a vented gallon bottle. All was well and the motors seemed to run gre…

      Started by:  Jen Wren in: Cummins Marine Engines


      0 Replies
      Reply #0 August 16, 2018 at 7:43 am I have a pair of QSB 380 motors with 11,000 hours on them. We service them EVERY 100 hrs. using Fleetguard fislters and Delo 400 15-40 oil. EVERY season the heat exchangers and after-coolers are removed and service on the bench per Tony’s protocol. This winter I removed the Airsep air filters, plugged the lines and ran a hose from the vent on top of the valve cover to a vented gallon bottle. All was well and the motors seemed to run gre…

      Last Post by:  Jen Wren posted: 5 hours ago

    • 6bta overheat issue- with an interesting caveat

      This topic has 2 replies, has 2 voices, and was last updated by Jeffrey Melhauser 6 hours ago

      August 15, 2018 at 11:35 am My 2001 6bta has developed an interesting ‘overheat’ issue and I’m pulling my hair out. When I get in the boat and it’s cold, meaning hasn’t run in a day or two, I can jump in, fast idle until temps come up to operating, get on plane and run ( including WOT) and temps are right where they should be on both the gauge and when taking an IR to the thermostat housing -between 185-190 and are within a couple of degrees of the other engine. …

      Started by:  Jeffrey Melhauser in: Cummins Marine Engines


      2 Replies
      Reply #2 August 16, 2018 at 6:28 am Thanks Rob I appreciate the response. Where physically on the engine do you usually find the wiring harness cannon plug depicted on the schematics? I’ve found various similar looking plugs in various locations. I want to make sure there’s a good connection on that plug and specifically the tan wire isn’t compromised. Grounding wire on the starter has been checked and cleaned up on both engines. I’m going to run some new ‘clean’ tempo…

      Last Post by:  Jeffrey Melhauser posted: 6 hours ago

    • 6BTA overheating 1 2

      This topic has 25 replies, has 5 voices, and was last updated by Robert Epsten 15 hours ago

      March 2, 2018 at 9:23 am Good morning, I have an issue with one of my 5.9 6BTA 370 hp. motors. If I go to cruise speed, my port engine wants to overheat to about 200 degrees for 5 to 10 secs, then come right back to 185 to 190. The alarm starts to chirp but then goes off. No problem for the rest of the day. Here is what I have done to try and figure it out. 1-belched the system twice at full temp, a few bubbles not much . Also bleed it through the petcock. 2- changed …

      Started by:  Robert Epsten in: Cummins Marine Engines


      25 Replies
      Reply #25 August 15, 2018 at 9:30 pm Now that the after-cooler is no longer a potential issue, it seems your salt water side from the through hull to the heat-exchanger has been addressed and functioning properly. If you have an IR gun shoot the sender housing and see if it correlates with the gauge.

      Last Post by:  Robert Epsten posted: 15 hours ago

    • QSM11 Dry Exhaust Slip Joint

      This topic has 5 replies, has 3 voices, and was last updated by Tony Athens 16 hours ago

      April 16, 2018 at 8:22 am What seals the slip joint in the QSM11 Dry Exhaust system, it looks like in the Cummins manual on quickserve they show some type of insert/seal, but its no where to be found in the parts diagrams? Is it sealed immediately when the manifold is installed, or does it have to run a few hours and blow a little soot to seal up? Can you use something like Fuchs 762 / Silkalene on the slip joint?

      Started by:  Will in: Cummins Marine Engines


      5 Replies
      Reply #5 August 15, 2018 at 8:45 pm Steve, Initial testing done on a vessel in Alabama failed.. ……………….Back to BETA II with no projected time line as to when…. Tony Tony Athens Seaboard Founder Go here for the latest stuff we put together and share for all to see: https://www.sbmar.com/tonys-tips/

      Last Post by:  Tony Athens posted: 16 hours ago

    • QSM11 Ceramic Coating of Exhaust Manifold

      This topic has 4 replies, has 3 voices, and was last updated by Steve 1 day ago

      April 16, 2018 at 8:16 am On the QSM11 Dry Exhaust manifold, is there any reason not to have the exterior portions of the exhaust manifold and exhaust side of the turbo coated w/ JetHot’s extreme heat 2500 degree ceramic coating to help push that heat on out of the exhaust system into the mixer instead of so much heat staying in the engine compartment?

      Started by:  Will in: Cummins Marine Engines


      4 Replies
      Reply #4 August 15, 2018 at 5:43 am I wonder why this wasn’t thought of initially? Money, perhaps? Ceramic coating exhaust systems is very common in the motorcycle world when trying to manage heat. Especially on air cooled engines like those found in Harley Davidson’s. But ceramic coating is also used in automobile exhausts, too. The thing these two applications have in common with the QSM11 is that they are all dry exhausts. I can’t imagine that ceramic coatin…

      Last Post by:  Steve posted: 1 day ago

    • Fleetguard on-engine filter – 6 CTA-M3

      This topic has 0 replies, has 1 voices, and was last updated by kullboys boys 1 day ago

      August 14, 2018 at 9:10 pm Hello everyone I have fuel filtration as per Tony’s recommendation, FS19513 – FS1000 on engine fs1280. is there a finer micron filter that is plug and play onto the existing 1280filter head spud threads ? Is it necessary to go finer micron on that last chance filter? i have had this filtration since 60 hours, 2010 with 1800hrs currently and she runs sweet as a nut, no smoke. ive always wondered if having the bulk kn… Thanks.

      Started by:  kullboys boys in: General Discussion


      0 Replies
      Reply #0 August 14, 2018 at 9:10 pm Hello everyone I have fuel filtration as per Tony’s recommendation, FS19513 – FS1000 on engine fs1280. is there a finer micron filter that is plug and play onto the existing 1280filter head spud threads ? Is it necessary to go finer micron on that last chance filter? i have had this filtration since 60 hours, 2010 with 1800hrs currently and she runs sweet as a nut, no smoke. ive always wondered if having the bulk kn… Thanks.

      Last Post by:  kullboys boys posted: 1 day ago

    • Qsb 380 problem sort of.

      This topic has 7 replies, has 4 voices, and was last updated by john 1 day ago

      August 3, 2018 at 3:11 pm Ok so I get a call today from the owner of a boat I work on. Said he had lost power lots of black smoke and shut the starboard engine down because of the problem. I’m not around so he had someone look at the engine. Seemed like the turbo looked a little oily is how he described it. Turbo was free and turned free. Took the boat out and it ran great and 2900 rpm with no smoke. Any ideas?

      Started by:  john in: General Discussion


      7 Replies
      Reply #7 August 14, 2018 at 4:32 pm Take a pic of the ecm and that is about all you Will get. You cannot see the pump. The pump sits right behind the computer. The older vintage qsb pumps were not that good. If you have one from what I understand it’s only a matter of time. Very good job of making it in usable and hard to get att to replace. About as hard as you could think of. Brilliant

      Last Post by:  john posted: 1 day ago

    • Water in 3. Cylinder 6bta

      This topic has 9 replies, has 5 voices, and was last updated by Fireisland1 1 day ago

      June 10, 2018 at 2:15 am Hello together, i buyed in april 2018 this boat and did maintance. The aftercooler in Tony´s way include pressure test, it was dry and good. Then inspecting the turbo, he has seen water, inside and outside ! The heatexchanger, I figured out, had an break inside. The hose had 5 mm rust inside. I did a trip, ½ hour, the engine was running fine. Now I was back and had a mechanic. He opened the cap near serialnr and it has a bit water. Then he …

      Started by:  Rainer Schöttler in: Cummins Marine Engines


      9 Replies
      Reply #9 August 14, 2018 at 2:56 pm Reman time

      Last Post by:  Fireisland1 posted: 1 day ago

    • 6BTA 5.9 Black smoke with power.

      This topic has 1 reply, has 2 voices, and was last updated by Rob Schepis 1 day ago

      August 14, 2018 at 6:57 am I have a pair of 2007 Cummins 6BTA 5.9 330hp engines. Anytime I give it fuel I have black smoke. I have changed the air filters, checked the turbo, all air hoses for leaks, cleaned the aftercoolers and I still can not find the problem. On the starboard engine I can see black smoke coming out somewhere closer to back of engine somewhere around the belt . The port RPM’s comes up faster then the starboard. I had it out of the water to have the se…

      Started by:  bigpage2 in: Cummins Marine Engines


      1 Replies
      Reply #1 August 14, 2018 at 2:22 pm The CC 28’s and 32’s are infamous for there poor exhaust design issues allowing water back into the turbos and the tight overhead engine room space that prevents the install of safe risers. Post some good pictures of your engines and exhaust. Post your full history of the boat, any prior issues, maintenance and exactly how you use it. What does “cleaning the aftercoolers” mean? Be specific. And who did this work? yo…

      Last Post by:  Rob Schepis posted: 1 day ago

    • QSM11 issues

      This topic has 9 replies, has 5 voices, and was last updated by Tom Mann 2 days ago

      October 16, 2017 at 8:34 am Hello all, I have a pair of 2004 QSM11’s recently the starboard side engine is burning a little more fuel and running 3-5 degrees hotter and 50-70 RPM’S behind the port engine. Subsequently I cannot hit 2340 at WOT. Previously both engine had no problem hitting 2340. My fuel filters, both the Racors (900’s) and the FS1009 were changed at 1180 hr, currently the engines have 1293 hrs. The bottom cleaned and props checked in th…

      Started by:  Tom Mann in: General Discussion


      9 Replies
      Reply #9 August 14, 2018 at 8:18 am Hi, After propping down from 35” to 33” and retuning and balancing the props I have experienced some changes which I’ll post here. The port and starboard engines are running closer temps at 1820 RPM cruise and 23 MPH speed: Temps @ 163p / 165s GPH 17.6p / 18.9s The engines are running better than before at all RPMs and make rated RPM of 2300 on both with WOT of 2360p / 2330s. Tony, in answering your response. Yes, I did repitch my props an…

      Last Post by:  Tom Mann posted: 2 days ago

    • Prop pitch 38 Tiara open 1 2

      This topic has 21 replies, has 4 voices, and was last updated by William Walter 2 days ago

      November 15, 2016 at 2:23 pm read Corey’s article about ovever propping on 480 ce engine .i have 3 bladed 24 by 30 props which register right on the power curve or slightly higher .i have some browning on my turbo and aftercooler. Was planning to have props reconditioned this winter as it’s my first with boat and one prop has a slight nick.what conversation should I be having with my prop guy to get me under the curve Attachments:You must be logged in to access …

      Started by:  William Walter in: Cummins Marine Engines


      21 Replies
      Reply #21 August 14, 2018 at 6:42 am Rob no vacuum gauges on the filtration.i have that on to do list.never monitored boost before because old gauges were hard to read .i just installed the new gauges as you know so I can see the boost now but have no numbers to compare to.fuel filters have about 75 hours on them but it’s an easy place to start.boat is burning slightly higher than when I brought up from Florida with a full crew ,full full,and a somewhat fouled bottom.i though…

      Last Post by:  William Walter posted: 2 days ago

    • Cummins QSB 480 – Raw Water Pump

      This topic has 1 reply, has 2 voices, and was last updated by Tony Athens 2 days ago

      August 13, 2018 at 7:24 pm Found that I am experiencing a raw water leak from the pump on my port Cummins QSB 480 engine (570-hrs). At low RPM there isn’t any leak however as I raise the RPM I can see the dripping from somewhere on the pump – I do see about a 1-2 gallons of water in my bilge following a 2-3 hour run and now realize it’s from this pump. I took off the black fan belt cover and noticed water hanging from the bottom of the pump housing. I…

      Started by:  Kevin French in: Cummins Marine Engines


      1 Replies
      Reply #1 August 14, 2018 at 4:39 am This is the factory Sherwood QSB pump and the water seal design have a dismal history of acceptable life.. Solution: It’s a new pump or a rebuild………… In the mean time, mitigate the saltwater damage to the engine mount, etc below the pump.. Damage is happening as I write. Below is what will happens if you do not address the issue.. UGLY! Have you serviced your aftercoolers? Do you know what “Marine Age”…

      Last Post by:  Tony Athens posted: 2 days ago

    • Repower Question

      This topic has 4 replies, has 4 voices, and was last updated by Stephen Oliver 2 days ago

      August 10, 2018 at 10:03 am I’m a new registered user, and I’d like to ask you a few questions and hopefully anyone can be of some help. sbmar website is great btw. I am interested in a purchase of a 1998 Maxum 4100 SCB, but it has 330hp Cummins 6BTA’s, and I think that is not enough engine for that weight boat. I could be wrong, but while I know some may say buy an express boat if you want something that does around 22knots, but I am leaning towards a Se…

      Started by:  Carmen L Spagnolo in: Boats & Repowers


      4 Replies
      Reply #4 August 13, 2018 at 10:40 pm Are they 330’s I just had a quick look and most I could find are 370? There was also an Aussie review of the boat with 370hp’s and they reckon close to 30knts top speed and 22-24 cruise.. so doesnt seem too under powered. As a comparison I have a 40 (45ft overall) locally built flybridge weighing in at arounds 11,5 metric tons so similar weight, with a higher (18deg) deadrise and narrower beam by around 1ft – so in theory mine…

      Last Post by:  Stephen Oliver posted: 2 days ago

    • Crankcase Pressure – T-Zues QSB 6.7 480HO (T-459PHP) DSL

      This topic has 1 reply, has 2 voices, and was last updated by Tony Athens 2 days ago

      August 13, 2018 at 12:31 pm Good afternoon Everyone! I just joined the forum. Appreciate you assistance as it comes. 2 Problems… 1. Crankcase Pressure – Main Issue – Can someone recommend what the solution would be? 2. I have no idea how one engine has the 94 hrs. which is correct, and the other has 555 hrs which is impossible. Are you guys able to help? Steve R - Attachments:You must be logged in to access attached files.

      Started by:  Steve R in: Cummins Marine Engines


      1 Replies
      Reply #1 August 13, 2018 at 5:37 pm I need a tad more to help: 1) Engine serial numbers 2) History of the engines per your use–Did you buy the boat new or? 3) Engine hours–SmartCrap Glitch– A Master Reset may help that 4) If you did not “see” the alarm, any other symptoms 5)I need good pictures of your engines from all around showing all 6) Any service history for “other things” 7) You have just one display but is “split screen”…

      Last Post by:  Tony Athens posted: 2 days ago

    • When should Turbos kick in?

      This topic has 12 replies, has 3 voices, and was last updated by Rob Schepis 2 days ago

      July 23, 2018 at 6:53 am HI All, I have been a boater a long time but new to diesels. I recently purchased a 2000 3100 Tiara Open with 6BTA59 Cummins engines with 950 hours . Before hauling from Florida to Wisconsin I had a diesel mechanic friend of mine go through the boat and we did the following: New Turbos All new Hoses New Injectors Changed all fluids and filters On a side note my Tachometers work sporadically so please excuse the lack of info on that side. …

      Started by:  Bill Karmis in: Cummins Marine Engines


      12 Replies
      Reply #12 August 13, 2018 at 2:32 pm When coming out of the harbor bring her up to 1,000, 1,200, etc for some light load and get the temps to settle in for a bit at thermostat opening temperature before pushing the throttles forward.. Salt air/mist in engine room = air side of turbo damage Poor exhaust design = exhaust outlet side turbo damage There’s more to it but that covers the lion’s share…. Rob "Luck is the residue of good design."

      Last Post by:  Rob Schepis posted: 2 days ago

    • Impellers – Another stupid question!

      This topic has 3 replies, has 2 voices, and was last updated by Bob Neill 3 days ago

      August 13, 2018 at 5:03 am Hi Guys I’m about to replace the impellers on my 2x 6bta 330’s and have an old impeller that was given to me by the previous owner. It clearly says Sherwood 17000 on it, however it has a threaded end, but the keyway isnt a thru key (ie through the thread) all the new ones I can find are through keyway types – are they useable in place of the non thru keyway ones? Steve Steve - Perth - Australia

      Started by:  Stephen Oliver in: Cummins Marine Engines


      3 Replies
      Reply #3 August 13, 2018 at 11:23 am If memory serves me, the key does not go all the way to the end of the thread when installed. The threaded portion is just an aid in the removal of the impeller. You should be fine with the new thru thread key way. Also, doesn’t the impeller kit come with two different size keys a long and short. What current size key is on there now? I would use the key that gives you the most bite without extending past the threaded end. Hope this helps mayb…

      Last Post by:  Bob Neill posted: 3 days ago

    • Wet Exhaust elbow – 6BTA 5.9

      This topic has 3 replies, has 2 voices, and was last updated by Stephen Oliver 3 days ago

      August 12, 2018 at 8:18 pm Hello All, I have a 6BTA 5.9 270HP JWAC and am trying to identify the wet elbow part number to buy. The cummins quickserve site lists the part as 3914717. But here at Seaboard online store it lists the 6BTA elbow as part number 3919373.. Has one number been superceded by the other?? What is the correct number. IF the correct one is 3914717, I do not see it for sale? Any insight would be appreciated. Keith

      Started by:  Keith Callaghan in: Cummins Marine Engines


      3 Replies
      Reply #3 August 13, 2018 at 12:19 am HI Keith haha – yes I know what you mean – its not much better here in Aus! Gravity is good but how much height is between muffler water level / boat waterline / turbo? If you have enough height you could easily design something that fits where the cummins elbow is and exits at around the same place or close enough to connect to the exhaust? You could always ‘fabricate’ something out of plastic pipe and get the local fabr…

      Last Post by:  Stephen Oliver posted: 3 days ago

    • CAV pump timing

      This topic has 5 replies, has 3 voices, and was last updated by Clark Leighs 3 days ago

      August 8, 2018 at 4:17 am Need some help in determining if my CAV injection pump is set correctly. It does not match the descriptions in the manuals available on the Quickserve site. Engine symptoms are black smoke, light at idle to heavy after or near hull speed at 1300-1400 RPM. CPL 953 Inspection window on the pump shows the scribe H at the circ clip at TDC. Am I interpreting this correctly and what needs to be done to correct the issue. Thanks D Attachments:You must …

      Started by:  David Wesner in: Cummins Marine Engines


      5 Replies
      Reply #5 August 12, 2018 at 9:22 pm If you answer Tony’s questions straight up you will get help. Referring to a previous post without at least finding and highlighting it will not get his attention. Answer his questions. He is the most knowledgeable, about these engines, person you will run across.

      Last Post by:  Clark Leighs posted: 3 days ago

    • Same boat new prospected buyer 6cta 480CE

      This topic has 11 replies, has 3 voices, and was last updated by Tony Athens 3 days ago

      July 19, 2018 at 8:36 am Hello all, I have a deposit on a 2003 CC35 powered with 480CE bearing a solid sea trial. Kinda ironic thing here, so bear with me, but I think you’ll all enjoy this. Once i put deposit down and before for that matter i have done nothing but put time in researching these engines. I found this thread here. 2003 35 Carolina Classic with 480CE’s – Things to look for? And it is the same boat, I have actually spoken to Allen , the previous…

      Started by:  Greg Weaver in: Cummins Marine Engines


      11 Replies
      Reply #11 August 12, 2018 at 3:41 pm 110%. SAFE. Glad you went go it.. Tony Tony Athens Seaboard Founder Go here for the latest stuff we put together and share for all to see: https://www.sbmar.com/tonys-tips/

      Last Post by:  Tony Athens posted: 3 days ago

Viewing 20 topics - 1 through 20 (of 964 total)