Cummins Marine Diesel Repower Specialists Forums Cummins Marine Engines

This forum contains 667 topics and 4,135 replies, and was last updated by  Johan 51 minutes ago.

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    • 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


      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


      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 7 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


      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: 7 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


      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


      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


      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

    • 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


      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


      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

    • 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


      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


      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

    • 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


      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


      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


      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


      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


      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


      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

    • Cummins 6CTA 450,8.3,8m

      This topic has 14 replies, has 6 voices, and was last updated by Tony Athens 3 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


      14 Replies
      Reply #14 August 12, 2018 at 3:25 pm Per engine.. Less per engine is OK. 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

    • 480 CE Head Replacement

      This topic has 2 replies, has 3 voices, and was last updated by Dave Carlson 3 days ago

      August 10, 2018 at 11:16 am I have finally decided to get the monkey off my back and replace the cylinder heads on my 480 CE’s. We have a 2005 SeaRay 420 Sundancer, and are the second owners of the boat. I know it was overloaded before we owned it, and I ran it overloaded for a year or so prior to finding Tony’s information here. I attached an estimate. I have been so paranoid about this issue that I have been reluctant to use the boat, especially since I lea…

      Started by:  Matt


      2 Replies
      Reply #2 August 12, 2018 at 1:52 pm Mat Very interesting post. I had a 420 like yours and was always concerned as my boat was over propped by 2 inches also, I knew of another 420 that dropped a valve seat and his bill was 14K since it took the piston and turbo so you are under the money for just one blown engine! Good luck with your upgrade.

      Last Post by:  Dave Carlson posted: 3 days ago

    • 6BT5.9M210 Fails to Start

      This topic has 9 replies, has 3 voices, and was last updated by Orin Guidry 4 days ago

      April 5, 2018 at 6:30 am 1989 6BT5.9M210. CPL 0742. Fuel pump Lucas CAV DPA. Engine has never failed to start. Small fuel leak two months ago, thought to be from the solenoid. It is difficult to see pump, outside of port engine in tight engine room. Very respected local fuel pump shop rebuilt and reinstalled pump. Ran great. Two weeks later ran great again in slip. On Saturday engine started for a few minutes before guests arrived and then shut down. When guests arrived…

      Started by:  Orin Guidry


      9 Replies
      Reply #9 August 12, 2018 at 5:58 am The end of the story and thank you for the previous helpful comments. Fuel pump was perfect on the test stand twice. New fuel lift (transfer pump) installed. New solenoid and adequate voltage to the solenoid. Injectors pulled and all good. Good compression in all cylinders. The fuel return line on this boat is in two parts – blue flexible hose connected to the engine and copper tubing connected to a manifold that directs the flow to the ta…

      Last Post by:  Orin Guidry posted: 4 days ago

    • CUMMINS 6cta 8.3 black smoke

      This topic has 6 replies, has 4 voices, and was last updated by Tony Athens 5 days ago

      August 4, 2018 at 2:18 pm I just purchased a 1997 TIARA 3500 express with CUMMINS 6cta. We noticed that that there was a lot of black smoke coming out mainly when the boat goes to plane. After a 4 hours trip both sides of the hull was black!! Engines have 1200 hours and they have only 50 hours after a big service (the port one did a major repair, and the starboard a big service) two years ago. The boat was in the dock for the last 2 years and we find that aftercoolers ha…

      Started by:  Kyriakos Kostarelos


      6 Replies
      Reply #6 August 11, 2018 at 9:31 am I want to SEE both aftercoolers along good pics of the engines -Mechanic made aftercooler ???? –NEED Pictures from all around the engine room, all clear & in-focus…….. As to propping–These engines needs to see an accurate 2700+ RPM and see it EASY.. 110% for sure—- if you have the factory sized props you are GROSSLY over propped. Your vessel is 20 years HEAVIER with multiple layers of bottom paint, water a…

      Last Post by:  Tony Athens posted: 5 days ago

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