Cummins Marine Diesel Repower Specialists Forums All Other Marine Diesels

This forum contains 24 topics and 137 replies, and was last updated by  Michael Black 1 week ago.

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    • Cummins Marine Forum Topics
    • Northern Lights M673 blowing black smoke

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

      February 11, 2018 at 4:14 pm My 2001 M673 with 550 hrs is blowing a lot of black smoke and it seems the oil level is high…. Not foamy, could it be diesel fuel in the oil? I changed the oil and the problem continued? I changed the fuel filters and impeller with no change in the problem – smells and seems hot? and lots of soot in the water. Never had soot before and not sure if hotter than usual – the high temp switch did not shut it down Could it be a t…

      Started by:  Michael Black


      3 Replies
      Reply #3 February 12, 2018 at 1:47 pm Attached are some pictures of the generator…. The last picture is the soot on the water. I ran the generator with the air cleaner out and the top off, no smoke with no load, as soon as I added a load it began to puff black smoke. The filters were crumbling when removed, intact while installed. Let me know what you think. Mike Attachments:You must be logged in to access attached files.

      Last Post by:  Michael Black posted: 1 week ago

    • Detroit 60 series 825 Hp research/issues/

      This topic has 2 replies, has 2 voices, and was last updated by Toolate 4 weeks ago

      January 20, 2018 at 11:33 am I have a friend considering the purchase of a 48 Sportfish express which has twin 825hp rated Detroit 60 series engines- 1700hrs on one and 2800+ on the other. 2003 Vintage dont know S/N’s. I have read a number of posts online in various forums back in ‘03-05 regarding concerns for their longevity in installations over say 500 hp and also some commentary on faulty aftercoolers backflooding (and severely damaging) engines as well as some ru…

      Started by:  Toolate


      2 Replies
      Reply #2 January 24, 2018 at 3:04 am This is good news (I think) and will obviusly have to do some research on the boat. Can anyone recommend a surveyor to look them over if he decides to go ahead with it?

      Last Post by:  Toolate posted: 4 weeks ago

    • Yanmar 6lya-stp black smoke 1 2

      This topic has 37 replies, has 4 voices, and was last updated by Tony Athens 1 month ago

      July 29, 2017 at 2:14 pm Hi everyone …I am new on this forum…i would really appreciate a lot if i could get some suggestions in order to solve problem with my Yanmar 6lya-stp 370hp. I am owner of 33ft semi displacement boat located in Europe-Croatia. Recently i installed used yanmar engine with 1100 working hours. Proppeler size is 21×26 and according to calculation it should not be to big to cause over-propping problem. Black smoke starts at about 1…

      Started by:  Antonio micula


      37 Replies
      Reply #37 January 19, 2018 at 5:52 am By-pass your muffler–Your exhaust pressure is crazy………. As to you engine and the way your vessel loads it in the 2500-2600 RPM range, that sound more like it’s a vessel vs. ” its Climbing over the hump” speed and the engine may just way overloaded at that speed. 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: 1 month ago

    • Transmission locks when rotated by hand

      This topic has 13 replies, has 4 voices, and was last updated by Tony Athens 1 month ago

      January 14, 2018 at 9:08 am Have twin 6btas 330 with ZF transmission. When having the bottom painted and the props repitched noticed that the transmission will lock when you rotate prop shaft slowly and will unlock if you reverse it and Turn again. Turns freely otherwise until it locks again after more rotations. Transmission is in neutral when this is done. Does not seem to be a problem when the engines are running and I’m driving the boat. However, several mo…

      Started by:  Dave sonksen


      13 Replies
      Reply #13 January 16, 2018 at 7:01 pm Not sure where I came up that you had a ZF220A — Sorry for the goose chase…. Does your data tag on the gear tag say ZF63A, or it that a guess, or from a survey………………………………..That would not be a normal OEM supplied gear for that engine.. Regardless, we’ll need to all re-think this issue as now things are way diffenent Tony Tony Athens Seaboard Founder Go …

      Last Post by:  Tony Athens posted: 1 month ago

    • Yanmar engine 464 hp

      This topic has 2 replies, has 3 voices, and was last updated by Tony Athens 1 month ago

      January 8, 2018 at 2:48 am Hi Everyone we have launched a new 53 ft boat with twin 464 , 6 cylinder commercial duty Yanmar diesel engines The engines are meant to have a maximum rpm of 2700 when at full speed. Unfortunately , they only go up to 2200 RPM ( Its not the propellers , since even with engines out of gear , engines dont exceed 2200 RPM) Any tips as to possible causes for this problem ? Thanks beforehand G Gerald

      Started by:  Gerald Wiehe


      2 Replies
      Reply #2 January 8, 2018 at 6:12 pm Tell us what the EXACT model of the engine.. 464 HP tells me nothing.. Better yet, maybe a very clear and in-focus picture of the data tag.. 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/ Attachments:You must be logged in to access attached files.

      Last Post by:  Tony Athens posted: 1 month ago

    • yanmar 6lya stp

      This topic has 3 replies, has 3 voices, and was last updated by Bill kosky 2 months ago

      November 29, 2017 at 12:42 pm Buying a boat with a 440 yanmar 6ly2a with 650 hours. Going to have head and valves replaced because of problems that the 440 has had , this engine has not had tjat issue.Anything else I should be concerned about with this engine. 2006 engine. Thanks Bill 1220 mayflower ave

      Started by:  Bill kosky


      3 Replies
      Reply #3 November 30, 2017 at 7:09 am Thank you Tony, I am flying up to Maine Tuesday, and I will take pictures of the motor, exhaust, etc. and post. Seller was very conscientious, as I am with my 370, and he has had coolers serviced, anti freeze I will check and she is propped properly. He only cruised from 2200 to 2800 but mostly at lower rpms. Now I am having the seller replace the head and the valves , this will be done by Lyman -Morse an authorized Yanmar dealer. Do you hav…

      Last Post by:  Bill kosky posted: 2 months ago

    • Help replacing shaft seal

      This topic has 7 replies, has 4 voices, and was last updated by Rob Schepis 2 months ago

      November 22, 2017 at 11:00 pm New to the forum. I’m out of Biloxi, MS and I’m running a 25ft Whitewater center console straight shaft inboard. Not too many guys run this kind of setup here but as I have found it eats up the nasty weather we get so its a win for me. I’ve been an outboard guy before this and this is my first inboard boat so I’ve learned a lot over the past two years of ownership. Now on to the topic, I am currently going through a repo…

      Started by:  Matt Pickich


      7 Replies
      Reply #7 November 29, 2017 at 11:51 am Yes sir. See attached.. 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 months ago

    • QCB 5.9 Heat exchamgers

      This topic has 4 replies, has 2 voices, and was last updated by Marc Smoorenburg 3 months ago

      November 8, 2017 at 9:47 pm Hello, I have a Sea Ray boat with Cummins QSB 5.9 engines. 425hp. I noticed that there was some corrosion? on the side heat exchangers on both sides, but only at 1 end. Refer to photos.. Can someone please tell me what is happening here? There is no fluid leaking at the moment, but would like to resolve this issue before it becomes larger. Also, I know I’m asking alot, but possible remedy and parts required also would help heaps. If itR…

      Started by:  Marc Smoorenburg


      4 Replies
      Reply #4 November 9, 2017 at 2:28 pm Hi Rob, To answer your question, NO. not any real reliable service history. I have owned the boat for 14 mths and had a Cummins service 7 mths ago. Incl oils, filters, zincs. Now I am calling my mechanic, & those coolers etc will be on the top of my list. Thanks Smurf6425

      Last Post by:  Marc Smoorenburg posted: 3 months ago

    • 6BTA Water pump

      This topic has 3 replies, has 2 voices, and was last updated by Tony Athens 3 months ago

      October 29, 2017 at 10:20 am In Tony’s post about the raw water pump and removal / service nightmare there is mention of “upgrading to a better pump” where the removal and servicing is not so tedious…. Anyone know what pumps are easier to remove and service? Attached is the mess that is on my port motor with a leaking raw water pump with signs of prolonged leaking…. Second photo is starboard motor’s pump and fuel cooler set up. Fuel h…

      Started by:  Grant Tankoos


      3 Replies
      Reply #3 October 29, 2017 at 12:23 pm It just takes time and a few bad words directed at Cummins and the builder–But you will prevail. .. You’ll figure out what will work best for you. 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 months ago

    • RPM Loss

      This topic has 4 replies, has 3 voices, and was last updated by Tony Athens 6 months ago

      August 2, 2017 at 9:08 am I have a 1999 Shamrock express with a Yanmar 4LH-DTE. Recently I have lost 4 rpm and about 4-5 mph. I have changed the fuel filters, air filter, and made sure the bottom and running gear is clean. Nothing has changed. The engine runs fun. no blue, black, or white smoke when running. I have no idea what it can be. The prop seems to be in good shape although I think its fairly old and has been reworked a few times. Is it possible that it’s p…

      Started by:  mike sylvestri


      4 Replies
      Reply #4 August 3, 2017 at 8:55 pm Mechanical throttle linkage issue? Post pictures of the engine as installed in the boat–All angles/all perspectives, Clear & in-focus 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: 6 months ago

    • Yanmar 4LHA STEs Black Smoke 1800-2000 Rpm — 2001 Albemarle Express

      This topic has 11 replies, has 4 voices, and was last updated by Bill Fuller 8 months ago

      June 19, 2017 at 1:42 pm I’m experiencing black smoke from both of my engines ONLY while trolling in the 1800-2000 rpm range. Boat seems to be plowing through the water and putting strain on engines. No smoke at idle or when the boat gets up on plane. My friend has the same engines and 2002 Albemarle 280 express. He has about 600 hours on his engines and just replaced the turbos. He is experiencing the same black smoke issue in that rpm range. I purchased the bo…

      Started by:  Kenneth Athans


      11 Replies
      Reply #11 June 23, 2017 at 10:40 am Ken, You don’t need to run the boat at WOT with a photo tach hooked up. I think you already had the info I was asking about. I am just a bit confused on your reading, probably all on my end. You already gave the info, but could you list Tach = 3300 Strobe = ? With 4 blades you may well be a bit over propped. If you look at the spec sheet Rob posted you will see that Yanmar would like to see these engines turn up 3450 to 3550 RPM under …

      Last Post by:  Bill Fuller posted: 8 months ago

    • Yanmar 4lh valve adjustment

      This topic has 2 replies, has 2 voices, and was last updated by Tony Athens 8 months ago

      June 1, 2017 at 5:10 am I’m going to attempt to adjust valves for the first time on a diesel engine, yanmar 4lha-stp.I will explain the procedure from what I have researched. Turn engine over by hand infill exhaust valve for #1 cylinder is fully open.Then adjust the exhaust valve for the #4 cylinder.Then turn engine over a little more infill the intake valve for the #1 cylinder is fully open and then adjust the intake valve for the #4 cylinder.Then turn over the …

      Started by:  brian sutton


      2 Replies
      Reply #2 June 1, 2017 at 5:53 pm Brian, Good post, IMO I personally prefer a different method for any diesel engine when adjusting valves.. I look at the firing order and label each cylinder.. Pull the valve cover and start barring over the engine (in the correct rotation).. I watch for any intake valve that is closing and when is stops moving, I adjust the EXH valve as I know it is now 100% closed.. I keep rotating while watching the next cylinder inline and feeling for TD…

      Last Post by:  Tony Athens posted: 8 months ago

    • 4LH raw water pump removal

      This topic has 1 reply, has 2 voices, and was last updated by Tony Athens 9 months ago

      April 5, 2017 at 4:57 pm Engine is a 4LH-DTE. Trying to remove the raw water pump and it won’t come. Am I missing something, I removed the supply hose, two nuts and two bolts. It wiggles, but won’t come. I tapped it with a piece of wood and a hammer, but I am hesitant to go much more than light taps. Also, I believe there are two o rings that seal this back up. one for the front gear case and the other for the discharge tube. Are they reusable? or is it best…

      Started by:  David Wesner


      1 Replies
      Reply #1 April 30, 2017 at 8:26 pm Look at the attached picture——-There are 4 of these bolts hold you pump in place, the rest should be obvious…….Yes, Yanmar did not make it easy.. 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/ Attachments:You must be logged in to access attached files.

      Last Post by:  Tony Athens posted: 9 months ago

    • Interpreting Yanmar EGT

      This topic has 7 replies, has 4 voices, and was last updated by David Marchand 10 months ago

      March 27, 2017 at 6:48 pm I am struggling to draw the right conclusions from our RPM/EGT data and hoping you can help steer me in the right direction. I am pretty nerdy so please don’t hold back on the technical depth (eg math) of a reply. BACKGROUND: Our prop has a small defect, so I will be pulling the prop off for pre-season service this week. The question at hand is: are we propped right? My latest conclusion is YES, but I am confused by light soot. Was hoping …

      Started by:  CG Weinert


      7 Replies
      Reply #7 March 31, 2017 at 6:23 am With the white smoke going away shortly after startup, you can be pretty sure that your injectors are fine. While I agree with Tony’s recent post, I still wonder if there might be some reason your engine isn’t making its 370 rated hp and that is why it is smoking. First confirm governor performance by opening the throttle to wot in neutral. You should hit 3,700 rpm, the high idle spec. If not then investigate your governor/fuel injec…

      Last Post by:  David Marchand posted: 10 months ago

    • Detroit 671TIB 485 Hp Head Replacement

      This topic has 1 reply, has 2 voices, and was last updated by Rob Schepis 11 months ago

      March 22, 2017 at 11:53 am Can anybody suggest supplier of DD 671 TIB head with J6 valves.  In need of 1 or 2 for rebuild.  Current heads have hairline crack and need to be replaced.  East Coast is preferred but any location is okay.  Please reply with contact info. 

      Started by:  Bradley


      1 Replies
      Reply #1 March 22, 2017 at 1:57 pm Try calling Joe or Rob at Atlantic Service in Far Rockaway (Queens), NY.  718-474-7467 Rob "Luck is the residue of good design."

      Last Post by:  Rob Schepis posted: 11 months ago

    • Motor Mounts

      This topic has 2 replies, has 2 voices, and was last updated by David Wesner 11 months ago

      March 15, 2017 at 6:39 pm I presently have Metalastic motor mounts (cushy float?) on my 4LH-DTE. One has had incident with saltwater, yes.. the one under the raw water pump. I’m thinking it may be good to get a replacement for it. Any suggestions on a good place to purchase. East coast, RI if that makes a difference. Thx  D Attachments:You must be logged in to access attached files.

      Started by:  David Wesner


      2 Replies
      Reply #2 March 16, 2017 at 4:07 am  so google, good place to purchase… Thanks.

      Last Post by:  David Wesner posted: 11 months ago

    • Replacement Tach for Yanmar

      This topic has 8 replies, has 3 voices, and was last updated by Charles Jourdan 1 year ago

      February 5, 2017 at 3:15 pm Hi Tony, I phototached my Yanmar tachs yesterday. The engines are 4LHA-DTE- 200 hp. At 3,000 rpm, port read 2846 and the Starboard was at 2853. I want to replace with accurate tachs. I have a tower that does not have tachs so I want to add 2 sets. One set for both stations. I need recommendations for tachs and sensors. I guess I need to replace the sensor on each engine, but can one sensor support two tachs? I also did the no load test and the W…

      Started by:  Bob Waters


      8 Replies
      Reply #8 February 11, 2017 at 12:11 pm Hi Bob  I  forgot to add that the Aetna manual shows that you can add  upper and lower tachs to the same  magnetic pick up.   You can go to their website and download all their installation instructions. Charles

      Last Post by:  Charles Jourdan posted: 1 year ago

    • Genset Heat Exchanger Maintenance

      This topic has 8 replies, has 4 voices, and was last updated by Rob Schepis 1 year ago

      February 3, 2017 at 7:58 am Pulled the heat exchanger off my Kohler 5EOZ genny yesterday and pressure tested it last night. I looped the seawater ports with one of the seawater hoses to close off the seawater side and I used the zinc port for pressure test. It takes a 1/4″ zinc so I used a 1/4″M to 1/8″F adapter bushing and then connected my 1/8″ fittings, gauge and schrader valve. I put plastic bag material over the coolant ports this way if I did …

      Started by:  Rob Schepis


      8 Replies
      Reply #8 February 5, 2017 at 3:20 pm Phil, In my reply to your inquiries I should have also mentioned that I flushed with fresh water after the acid and again at the end.. 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 year ago

    • Yanmar 6ly440 custom exhaust parts or water lock box recomendations

      This topic has 2 replies, has 3 voices, and was last updated by Tony Athens 1 year ago

      January 31, 2017 at 7:37 pm Trying to redo my custom dry exhaust and I can’t find turbo flange or 5 inch mixing end is there any place to buy that stuff? Also looking into using vetus water lock so maybe I can assemble a wet exhaust system if I can’t find stuff to make a dry one again. Any help would be appreciated thanks.

      Started by:  Darrel


      2 Replies
      Reply #2 February 1, 2017 at 8:31 pm Darrel,   You need to send and or post  some really good pics showing all of what you have now so one of us can assess what you are  trying to accomplish or what we need to deal with..  Without that, all of us are blind.     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: 1 year ago

    • Wrong Coolant

      This topic has 3 replies, has 3 voices, and was last updated by Bryan Dougherty 1 year ago

      January 23, 2017 at 11:01 am While having my oil changed in Key West, tech also offered to change the coolant in my Yanmar 6LY3-UTP (in ’09 mainship 34T).  I usually have all supplies on hand so I know what we’re using but I only had 1 gallon of ELC coolant and he said no problem he’d bring what’s needed. I return back to the boat this week to find the left over/extra coolant used was Peak Fleet Charge SCA Precharged…it says good for all Heavy…

      Started by:  Bryan Dougherty


      3 Replies
      Reply #3 January 24, 2017 at 9:57 am Rob and Dave, Thanks for the response/advise…I’m going to change this coolant out for the Dex-Cool when I get the boat back to North Palm Beach this weekend. As careful as I’ve been on all service items for this engine its not worth the risk to keep it. Cheers Bryan

      Last Post by:  Bryan Dougherty posted: 1 year ago

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