Cummins Marine Diesel Repower Specialists Forums Cummins Marine Engines

This forum contains 997 topics and 6,141 replies, and was last updated by  siwicki 2 hours ago.

Viewing 20 topics - 1 through 20 (of 997 total)
    • Cummins Marine Forum Topics
    • 6BTA Spool Up Issue 1 2

      This topic has 23 replies, has 6 voices, and was last updated by siwicki 2 hours ago

      February 23, 2019 at 5:54 pm Dear Tony, Carolina Classic 28 with a pair of 6BTA5.9 M3 330HP. Roughly 2200 hours on the engines with no major problems. Cummins did a full service at 2000 hours which included adjusting the values. I generally put about 60-80 hours a year on the engines. I also have your water pumps on for the last three years. I had a strange problem with my starboard engine that happened on my last trip in December, the afternoon before I had to haul and wi…

      Started by:  siwicki


      23 Replies
      April 24, 2019 at 3:36 pm All, Just back from an expected 3 week trip to Afghanistan. The boat is now in the water. Still working on the turbo exhaust bolts. Got one bolt off so far. Hopefully another period coated in PB Blaster will loosen the other ones. In the mean time, new after cooler core and new gear cooler installed. New water pipe below turbo (between gear cooler and heat exchanger) installed. Only problem, this engine (starboard) won’t start, whi…

      Last Post by:  siwicki posted: 2 hours ago

    • Cummins QSM 11 Smartcraft fault 422 coolant level sensor

      This topic has 0 replies, has 1 voices, and was last updated by Jeremy Gavin 9 hours ago

      April 24, 2019 at 8:32 am I have a 2011 searay sedan bridge with QSM11s. I am getting a fault code 422 sensor coolant level. Looks like this is a Cummins ECM code and not a smartcraft code. Do these motors have coolant level sensors? If so where is it located? If there are no coolant level sensor then how do I clear this code? Can it be done through smartcraft or does it need to be done through Cummins ECM? Thanks for your time. Jeremy Gavin Attachments:You mus…

      Started by:  Jeremy Gavin


      0 Replies - Can you Help? ...be the First to Respond!

    • QSB 6.7 Heat exchanger corrosion

      This topic has 3 replies, has 3 voices, and was last updated by Barry 9 hours ago

      April 19, 2019 at 5:19 am At 2000 hour service heat exchanger badly corroded. Radiator shop supporting large diesel shop could not get core out. Have owned boat for 2 years. Zincs in heat exchanger have shown little wear during that time. Corrosion and little zinc wear seem inconsistent. Thanks to previous advice from Seaboard, I learned the QSB 6.7 after cooler had plastic caps. (Discovered when unable to remove zincs.) When changing out plastic after cooler cap…

      Started by:  ciscokid69


      3 Replies
      April 24, 2019 at 8:13 am I have the same issue. Poor design. My zincs look almost new- bad. Looking for a solution too.

      Last Post by:  Barry posted: 9 hours ago

    • Alternator Overheating

      This topic has 10 replies, has 4 voices, and was last updated by Rob Schepis 13 hours ago

      April 19, 2019 at 12:08 am G’day Out cruising today and smelt a weird smell on my Cummins 6BTA 5.9, had closer look and it was coming from the alternator. Took a temp reading and it was 109c the port was 87c………. Any ideas or am I in for a new alternator Thanks

      Started by:  Pierre


      10 Replies
      April 24, 2019 at 3:52 am Pierre, DVM = digital voltage meters. Here’s the article I was referencing. Looks like you have a nice setup. Just need to be 100% aware as to how it works, how’s it’s wired in and what it can (and cannot tell you). https://www.sbmar.com/articles/installing-digital-volt-meters-dvm-boat/ How about some more pics and info on the boat …. it looks like a beauty. Rob "Luck is the residue of good design."

      Last Post by:  Rob Schepis posted: 13 hours ago

    • Hour counter counting backwards QSB 5.9 – 480

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

      April 23, 2019 at 6:46 am Hi there We have a pair of QSB 5.9 – 480’s in one of our boats, where the port engine is having some issues. Engines have done less than 500 hours, but hour counter on port engine is living its own life. Actual engine hours is approx 480, but SC1000 rev instrument is showing hours that vary uppwards and downwards from 280 hours. (i.e. running hours figure both increases and decreases…) Also, there are some synchronisation issue…

      Started by:  Ktranbe


      0 Replies - Can you Help? ...be the First to Respond!

    • Newbie Alert-Cummins SMX sensor info needed!!

      This topic has 6 replies, has 4 voices, and was last updated by Tony Athens 2 days ago

      April 16, 2019 at 8:24 am Guys, (this is my first diesel boat so sorry for the dumb questions)I have a Cummins 5.9 6BTA5.9 and just added the SMX digital gauges. I am trying to figure out what sensors I need and their placement on the motor. I bought the kit but just seeing if I should add anything else. 1st pic there is one sensor there and one next to it with nothing hooked up 2nd pic at the top there is 2 brass fitting coming out with nothing hooked up 3rd pic is the…

      Started by:  IslandStyle


      6 Replies
      April 22, 2019 at 5:07 pm I really want to help, but you need to be way better picture wise…………Take better pictures, hold the camera steady and level, and hold it in a position so I can’t see what there in to see. I cannot see around a corner. Send them to me direct.. tony@sbmar.com .But, from the little I can “see” your engine will have to be rewired–I see at least two things that are “boat builder mods” and…

      Last Post by:  Tony Athens posted: 2 days ago

    • Quick Question on HX End Caps and Gaskets

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

      April 22, 2019 at 6:49 am Getting ready to replace a leaking end cap and gasket on 6BTA heat exchanger. I’m using the Seaboard caps and gaskets. My question is whether any material or not should be applied to edge of HX tube, gaskets, or cap. After an exhausting search on this site, came up with several responses. 1. Nothing, Seaboard gasket is soft enough. 2. A little bit of grease on gasket edges. 3. Rectoseal on gasket edges. 4. Light coat of RTV …

      Started by:  John


      2 Replies
      April 22, 2019 at 8:21 am A little Rector Seal 5 is always good. Rob "Luck is the residue of good design." Attachments:You must be logged in to access attached files.

      Last Post by:  Rob Schepis posted: 2 days ago

    • Oil Change

      This topic has 17 replies, has 8 voices, and was last updated by John 3 days ago

      April 17, 2019 at 11:00 am Hello All, I would like to start performing my own oil changes. I am at the 75 hour mark since the last change. Engines: Cummins 6BTA 5.9 330hp @ 2800 Hours: 1,051 for each engine I have been trying to identify a step by step process for the oil change protocol, but have not had any luck. For example, what hardware are you using to extract the oil? I have located various oil change kits on West Marine and Amazon etc…, but I wanted to s…

      Started by:  John


      17 Replies
      April 21, 2019 at 3:27 pm Hi Paul, Thank you for the reply and suggestions. Appreciated… John

      Last Post by:  John posted: 3 days ago

    • Aftercooler bundle condition

      This topic has 2 replies, has 2 voices, and was last updated by Robert Vetrano 4 days ago

      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!!…

      Started by:  Robert Vetrano


      2 Replies
      April 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 it’s fine, so I’ll go with that upon successful pressure testing.

      Last Post by:  Robert Vetrano posted: 4 days ago

    • Fuel cooler article

      This topic has 0 replies, has 1 voices, and was last updated by Larry Backman 5 days ago

      April 19, 2019 at 3:25 pm Great fuel cooler removal article Brendan! https://www.sbmar.com/articles/understanding-marine-fuel-coolers/?mc_cid=b9945a9cb7&mc_eid=82c3806597 I have that massive QSM cooler which means it’s almost impossible to change the impeller. I’d love to remove it for both simplicities sake as well as adding the ability to change the impeller in an emergency. How would I go about analyzing whether I can or cannot remove the cooler? In simple …

      Started by:  Larry Backman


      0 Replies - Can you Help? ...be the First to Respond!

    • '03 6CTA 480ce vs '06 QSC 540, which preferred

      This topic has 2 replies, has 2 voices, and was last updated by John 5 days ago

      April 19, 2019 at 5:17 am First, love the forum and thanks to everyone who participates. Such great reads and info. Looking at two boats, one with a 2003 480 550 hours and the other with a 2006 QSC with about 1,000 hrs. Both seem to have been maintained evenly and are clean. I know about the 480’s 23 gph rule at 2,200 RPM and the turbo and aftercooler don’t show the extreme discoloration you can see in some pics on this site. Don’t know much about the…

      Started by:  John


      2 Replies
      April 19, 2019 at 3:23 pm Thank you Rob… No pics, sorry. Both motors are generally clean and appear in good cond. The QSC is all orig. The 6CTA had the exhaust redone, adding a hump in it to prevent water ingestion and looks quite well done. J

      Last Post by:  John posted: 5 days ago

    • QSB Mystery Noise

      This topic has 3 replies, has 4 voices, and was last updated by Fireisland1 5 days ago

      April 17, 2019 at 9:26 pm Just finished a wave of spring maintenance on my QSB 5.9 380’s. After running her home from the boatyard this week I noticed a clicking/knocking noise while at the dock. I cannot isolate where it is coming from exactly other than it is on the front of the engines somewhere near the belts/alternator/fuel pump/water pump. I recently replaced the water pumps with SMX pumps, and I originally thought it was coming from the tensioner for the w…

      Started by:  roborr24


      3 Replies
      April 19, 2019 at 2:11 pm Did you take off both belts?

      Last Post by:  Fireisland1 posted: 5 days ago

    • After cooler set-up

      This topic has 3 replies, has 2 voices, and was last updated by Mark Tripi 5 days ago

      April 18, 2019 at 5:56 pm In addition to removing the Sherwood r/w pumps from my 4 BTAs, I had to replace the after coolers. After almost 20 years they started leaking and luckily I found it before the season and before I ate both engines. As the original after cooler is NLA, I went with the Bowman coolers. I mounted them on an aluminum angle, had a flange welded onto the discharge for the air heater and went to work mounting them. I will test run the engines on the shop…

      Started by:  Mark Tripi


      3 Replies
      April 19, 2019 at 12:19 pm this is the tool if you don’t have a machine Attachments:You must be logged in to access attached files.

      Last Post by:  Mark Tripi posted: 5 days ago

    • Oil analysis found coolant

      This topic has 4 replies, has 2 voices, and was last updated by Ron Kasel 5 days ago

      April 16, 2019 at 10:19 pm Hi, I have a 6CTA8.3-M3. My oil analysis came back showing high levels of sodium, silicone and potassium. The report says to check for source of coolant leak and repair. It also says inspection for source of wear may be warranted at this time. The oil analysis is attached. My questions are: Are these levels high enough to require immediate action? The Cummins troubleshooting and repair manual lists the oil cooler as the most likely cause. Is thi…

      Started by:  Ron Kasel


      4 Replies
      April 18, 2019 at 11:21 pm I’ll get my technician going on servicing the aftercooler per your protocol. Photos to come! Thanks again for your help! Ron Ron Kas

      Last Post by:  Ron Kasel posted: 5 days ago

    • Still on the hook, things not getting better

      This topic has 20 replies, has 4 voices, and was last updated by Paul Hoffman 6 days ago

      April 6, 2019 at 4:38 pm Think it’s time to call around and get a professional diesel mechanic out to the boat. If you were following my other thread you saw that my stbd 1999 330 HP 6BTA 5.9 M3 fried the fuel solenoid. Port engine working fine. My solenoid (original) was obsolete of course and the replacement I’ve gotten from the local Cummins distributor doesn’t fit. So I decided to cut my losses and tie wrap the fuel lever in the up position and …

      Started by:  Paul Hoffman


      20 Replies
      April 18, 2019 at 4:17 pm While we didn’t make it as far south as we had hope, we did find that (aside from the mechanical issue, that I can only hope/think is just something that couldn’t be prevented?) everything on the trip went well. Our year plus of local ‘practice’ and couple of months of voyage planning paid off. We had no navigational or other mechanical issues. No surprises at all. We’re ready to head south again after hurricane…

      Last Post by:  Paul Hoffman posted: 6 days ago

    • 6bta 330 Aftercooler Question

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

      April 17, 2019 at 8:36 am All Recently bought the maintenance kit and serviced one of my AC as per Tony’s instructions . My question is my raw water end cap seems to have a hair line gap and isn’t as flush against the AC block as the other side is . After completing the service I pressure tested the cooler with a garden hose set up letting it sit for about a 1/2 with no leaks . Will this be an issue down the road and would you suggest I pull the cap and use the s…

      Started by:  Greg insinga


      3 Replies
      April 17, 2019 at 12:09 pm I see no issues.. Rob "Luck is the residue of good design."

      Last Post by:  Rob Schepis posted: 1 week ago

    • 6bt high mount turbo question

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

      April 13, 2019 at 3:28 pm I have a 6bt with dry stack exhaust (mounted belt-end forward) and am about to redo my exhaust piping. I’d like to move my turbo to the high mount location, which would give me a straight shot aft to where the exhaust joins the muffler piping, but this would require the air filter side of the turbo to be forward. My question is can the turbo be mounted in that orientation? All the pictures I see have the exhaust side on the belt end of th…

      Started by:  Paul Schuyler


      2 Replies
      April 17, 2019 at 6:30 am Hey that’s my boat!! Tony did a great job building my system very happy 7 years later. Mike

      Last Post by:  Michael Starr posted: 1 week ago

    • Urgent Help – Ideas Please

      This topic has 17 replies, has 4 voices, and was last updated by Stephen Oliver 1 week ago

      April 11, 2019 at 2:02 am HI Guys So 3 of 4 engine mounts went on well – even though they had lag screws as fixing (buried about 3-4inches in the Engine mount turrets.) Number 4 – nuts and lag bolts turned out easily – and they have been cut down – presumably due to the shorter distance from the top of the mount pillar face to the hull bottom – On putting them back in they turn.. so the holes are stripped. it looks like oil or something has …

      Started by:  Stephen Oliver


      17 Replies
      April 16, 2019 at 4:28 am Ah yes the ubiquitous helper! My son is only 2 so not much help unless I want things chucking around, my son is only 2 so my wife is always running around after him if I’m in the bilge, family is overseas, and friends are at work when I’m working on the boat.. so have learned to cope by myself! I’m not a small bloke but can get in and out of tight spaces, can twist my arms in a way cirque de soliel would be proud of and pay for…

      Last Post by:  Stephen Oliver posted: 1 week ago

    • SMX Pump Install

      This topic has 5 replies, has 4 voices, and was last updated by Justin Riege 1 week ago

      April 3, 2019 at 11:24 am Hi, I am thinking of installing a couple SMX pumps on a pair of 6bta 370’s. Nothing ‘wrong’ with the sherwoods, just figured they were tired and rather than just rebuild them, I’d upgrade them. Have read tony’s tips on the subject. Still have a couple questions before I move forward. Who has slick ideas on how to jack up the front port corner of the engine? I was thinking of rather than trying to jack it up I mi…

      Started by:  JimmyK


      5 Replies
      April 15, 2019 at 9:14 am If the lower nut doesn’t move that tells you that the height of the engine hasn’t changed as a result of your work. As far as the engine moving laterally only if all of the studs on the isolators were installed vertical with the engine and not angled in or out or whichever way, only then will the motor probably stay put. If the isolators are angled, then as they were tightened up initially there could be some “Spring” i…

      Last Post by:  Justin Riege posted: 1 week ago

    • 2015 Cummins QSB 5.9 480 HP

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

      April 14, 2019 at 1:38 pm Good day , Anyone have any issues with these engines I have them in a Cabo 35 Express with about 280 Hours been in fresh water most of her life thanks for any reply’s Cabo Express with Cummins QSB 5.9

      Started by:  michael platzer


      1 Reply
      April 14, 2019 at 6:15 pm I takes care of at least 10 of the QSB 5.9 480’s———They are rock solid when set up right and I continue to recommend them as a great engine.. But like any engine in the power to displacement / weight range, setting it up right is the key along with proper maintenance of the seawater side of the engine… Being a fresh water boat is “way good”, but once in salt water, you need to be extra diligent as to af…

      Last Post by:  Tony Athens posted: 1 week ago

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