Cummins Marine Diesel Repower Specialists Forums All Other Marine Diesels

This forum contains 58 topics and 312 replies, and was last updated by  Tony Athens 1 week ago.

Viewing 20 topics - 1 through 20 (of 58 total)
    • Cummins Marine Forum Topics
    • Yanmar 6LY main heat exchanger color

      This topic has 9 replies, has 5 voices, and was last updated by Tony Athens 1 week ago

      February 4, 2019 at 9:04 am Please look at the attached photo. I am helping a friend who is considering buying a 2006 Mainship Pilot 34 with a Yanmar 6LY 370 hp engine. A “Yanmar Certified Technician” who was present at the seatrial said that the main heat exchanger, which is very visible in this pic, is discolored and is a sign of severe overheating. Well the color is certainly not the Yanmar silver grey, but it is entirely uniform and doesn’t look like…

      Started by:  David Marchand


      9 Replies
      February 4, 2019 at 7:31 pm I wish I had a much better picture so I could really “SEE”, but even a “fuzzy” view tells me that this engine, when it ran or did run, is being squeezed to the max, plus the signs of a loss of coolant in the combo exhaust manifold/coolant tank are more than obvious…………..Walk away unless someone gets a $25-30K concession on the $$.. The 6LYA is a very good engine, and IMO, is as good as a 370 …

      Last Post by:  Tony Athens posted: 1 week ago

    • Help me out here…

      This topic has 4 replies, has 3 voices, and was last updated by cale domek 3 weeks ago

      January 13, 2019 at 3:03 pm Cummins 6BTA. 380ish hours Running perfectly with no issues. Racor 1000s had some gunk in the bottom so I pull it apart, clean it, change filter and replace filter. Fill the racor, and go to prime and she doesn’t seem to prime. Fire her up and she doesn’t like it. Runs for a few then sputters out. Only thing I touched was the filter. I took the below vlinked video cause it shows the sound I’m getting when I’m priming…

      Started by:  Mike Pettee


      4 Replies
      January 21, 2019 at 8:17 pm I had a cracked 5 cent oring on the t handle that had me stumped for hours, she would prime and start but would sputter out after a while. sea ray 440eb

      Last Post by:  cale domek posted: 3 weeks ago

    • Onan 5MDKBH Generator

      This topic has 9 replies, has 4 voices, and was last updated by Patrick 1 month ago

      January 11, 2019 at 7:25 pm Hello All, Can anyone tell me if this 2006 5KW generator has a replaceable zinc? Can’t find any obvious sign of one. Thanks.

      Started by:  Patrick


      9 Replies
      January 13, 2019 at 1:55 pm That is a slick set up. Well done. Dan wrote: Patrick wrote: Did you plumb a permanent adapter to hook a garden hose too? Through a tee on the intake side of the raw water strainer (blue valve in picture attached) that is connected to a distribution manifold that both engines, air con, live well pumps, wash down pumps and the generator are fed through a water hookup on deck, I can flush all with the garden hose or the onboard freshwater suppl…

      Last Post by:  Patrick posted: 1 month ago

    • 6LYA-STP Turbo exhaust question

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

      December 22, 2018 at 4:19 pm I took off the turbo exhaust riser and mixer to replace a stringer and I noticed some discoloration on the exterior of the turbo exhaust. Was curious if this is normal or something that needs to be looked into further. Attachments:You must be logged in to access attached files.

      Started by:  Collin4350


      1 Reply
      December 22, 2018 at 7:44 pm Send me those pics direct in High Res.. Also stand back 2-5 ft , (or what is needed).. I want to “see” your exhaust mixer/riser or what ever you have as installed in your boat.. tony@sbmar.com 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

    • 99 cat 3208ta raw water pump impeller

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

      December 18, 2018 at 9:23 pm I’m trying to find impellers for a cat 3208 raw water pump. Browsing around the internet it looks like a 17000p impeller is the right one. Anyone know if that will work? I put it on here rather than call so it might help someone else out.

      Started by:  john


      4 Replies
      December 19, 2018 at 9:20 am I’m not up on exactly when Cat used which pump but the 3208 could take a Sherwood or a Jabsco so check the pump cover carefully for pump ID… Rob "Luck is the residue of good design."

      Last Post by:  Rob Schepis posted: 2 months ago

    • Hose clamps

      This topic has 5 replies, has 4 voices, and was last updated by Rob Schepis 2 months ago

      October 11, 2018 at 8:36 am I’m about to buy all new hoses for my 6btas but I have a question about the spring loaded hose clamps. Many of the old hoses on my boat leak unless I cinch the clamps all the way tight… which seems to me defeats the point of the spring loaded feature. With new hoses and clamps, how tight to you make them?

      Started by:  Mike Schmidt


      5 Replies
      December 4, 2018 at 6:00 am Not to fancy but might be worth a try, the price of admission is certainly not too steep… https://www.lowes.com/pd/AMERICAN-VALVE-Torque-Wrench/1244081?cm_mmc=SCE_BINGPLA_ONLY-_-RoughPlumbingElectrical-_-PlumbingConnectionsAndSupport-_-1244081:AMERICAN_VALVE&CAWELAID=&kpid=1244081&CAGPSPN=pla{ifdyn:dyn}&k_clickID=bi_264334745_5481216628_13814743298_pla-1100008777698_c_&msclkid=7a224af549211116d06c16f330e2b7be Rob "Luck …

      Last Post by:  Rob Schepis posted: 2 months ago

    • Yanmar 6lya-stp black smoke 1 2

      This topic has 40 replies, has 4 voices, and was last updated by Tony Athens 3 months 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


      40 Replies
      October 28, 2018 at 6:12 am Let’s SEE your engines entire Crank Case Ventilation System…………..Just a factory hose going to ?? Not over filled in the crank case/oil pan ? More IS NEVER better on very shallow sump HIGH-RPM Engines in a planing boat. Usually the opposite works better (running on the low mark or even a tad below) when you have possible blow-by or oil whipping issues. Tony Athens Seaboard Founder Go here for the latest stuff we pu…

      Last Post by:  Tony Athens posted: 3 months ago

    • Yanmar 6LYA 370 Boost Question

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

      October 20, 2018 at 7:32 am Hi Tony/Corey, Thanks for all of the great information that you post online. It’s a huge help for us. We are working through a prop issue on a straight inboard center console (29′) with a 6LYA 370 that we bought used recently and have been refitting and had a question regarding boost. Some background: – ’04 6LYA 370; 1.96 gear ratio – Boat had A LOT of black smoke when powering up to cruise and when powering on …

      Started by:  michael sanchez


      4 Replies
      October 27, 2018 at 11:15 am Boost is what it is…..If it were me, I shoot for an accurate 3400-3450 at WOT and use a AMCE prop.. IMO, way better technology ……………. 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

    • Yanmar 6cxm-gte2

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

      October 24, 2018 at 7:01 am Looking at a Luhrs that has Yanmar 6CXM-GTE2 motors. Boat is freshwater and low hours..Any input on these motors? Currently run C series Cummins with the Denso pump in a Tiara. 36 Tiara Cummins CTA M2 420

      Started by:  Shawn Keulen


      4 Replies
      October 27, 2018 at 10:05 am Good /strong base engine with a very complex Yanmar aftercooler/cooling system.. If it was a saltwater boat, I would walk as the parts in the cooling system are crazy $$.. If I remember correctly, the engine has like 12 zincs and all are proprietary Yanmar? Dry turbo (don’y really like that like) and the seawater pump drive has had issues to where the most of the front of the engine needs to tore down to get to it. I know of 2 of these t…

      Last Post by:  Tony Athens posted: 3 months ago

    • 180hp cummins to 210 hp cummins

      This topic has 2 replies, has 2 voices, and was last updated by michael semien 4 months ago

      October 12, 2018 at 3:31 pm Hi Tony I have a 31 Bertram with 2 180hp cummins diesels that are old but run just great with no major issues. My top end speed is about 16 knots at max rpm on both engines. I am running 20 x 20 props behind twin disc 2:1 running gear. I heard from the local gallery change the props, change the gear, change the injector pump etc. I would like to keep these engines until they die. What can I do to increase the hp to at least 210hp and get more s…

      Started by:  michael semien


      2 Replies
      October 15, 2018 at 12:31 pm Excellent response. Would changing from these twin disc to 1.56 ZF 63a’s be almost seamless as far as size or would I need more modifications. Thanks. Capt. Mike

      Last Post by:  michael semien posted: 4 months ago

    • Re-power MerCruiser 5.7 Horizon MPI to a Yanmar 4LHA-STE 230hp

      This topic has 4 replies, has 3 voices, and was last updated by Tony Athens 5 months ago

      September 15, 2018 at 9:32 am Hi Guys, Has anyone had any experience re-powering a boat from a MerCruiser 5.7 MPI to a Yanmar 4LHA-STE 230hp? I was curious if there was any performance gains with the re-power… I have a 27′ H&H lobster boat with a MerCruiser 5.7 MPI with a 2.5:1 ZF63a gearbox, 1.5″ shaft, and a 20″x17″ 4-Blade propeller. Right now she cruises 14kts at 3400 RPM’s. Ideally, I would like a 17-18kt cruise. Any insight…

      Started by:  Patrick Presti


      4 Replies
      September 16, 2018 at 9:40 am Noting that matters–The 230 was an early rating with hotter fuel used in a test cell.. Later on, Yanmar rated the engine in a test cell using colder fuel, hence the engine could make 10 HP more at WOT/3300+ RPM… 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: 5 months ago

    • Winterizing Anti Freeze

      This topic has 3 replies, has 2 voices, and was last updated by Rob Schepis 5 months ago

      September 10, 2018 at 2:19 pm is it ok to use a winterizing anti freeze that has alcohol in it in a 6cta-8 engine Capt Jerry

      Started by:  JEROLD MARMER


      3 Replies
      September 12, 2018 at 4:22 am If you can drain the water from the coolers first (remove zincs and reinstall) and drain your mufflers then you don’t have to worry about any dilution issues and you will use less. Depending on you setup 6 gallons should be more than enough to ensure a solid pink out the back. Here’s 6 gallons ran through my 6BTA’s. I do pull the zincs to drain the seawater so the engine is getting straight pink as soon as she fires and pul…

      Last Post by:  Rob Schepis posted: 5 months ago

    • Priming bulb inline w/o valving

      This topic has 2 replies, has 2 voices, and was last updated by Will Giese 5 months ago

      September 6, 2018 at 1:02 pm I’m about to order up a double double filtration kit, but still debating on the squeeze bulb kit. I don’t mind the expense, but it won’t fit in my engine hold. There’s barely enough room for the double double kit. From what I’ve read of Tony’s posts, it seems like the only significant concern with priming bulbs is one of flow restriction – hence, the valving to bypass the bulb in the complete kit sold he…

      Started by:  Will Giese


      2 Replies
      September 6, 2018 at 4:52 pm Thanks, Rob. Can’t believe I didn’t think of that before. Basically, I’d just planned on swapping out the Racor 500 for the double double in the current engine hold location, assuming it was there for a reason. I could certainly remove the Racor completely, splicing the fuel line together. There is indeed, a ton more space by the tanks under the cockpit than in the engine hold. The double double would easily fit there and actua…

      Last Post by:  Will Giese posted: 5 months ago

    • Yanmar 4LH-TE – Proper Oil Filter?

      This topic has 3 replies, has 3 voices, and was last updated by Will Giese 5 months ago

      September 1, 2018 at 12:20 pm OK…on paper, this seems obvious. However in person and with products in hand, not so much. I’ve got two oil filters for a Yanmar 4LH-TE in hand, and they couldn’t be more different. Let’s start with the original filter. I have the original build sheet for my 1988 Nordic Tug which contains many details, including the Yanmar oil and filter part numbers. 119100-35100 is listed for the oil, and while there’s a WIX insta…

      Started by:  Will Giese


      3 Replies
      September 5, 2018 at 1:32 pm Well Tony…I gotta live with what I have, crap or otherwise. Engine runs beautifully and I can’t justify doing anything other than keeping it running while I own the boat. Now…when our upgrade to a Nordic 32/37 happens in a couple years, I’ll definitely bend your ear on those. All eras we are interested in are Cummins equipped. Rob – thanks much for the pointer to Bayshore Marine. Prompt response, very knowledgeable …

      Last Post by:  Will Giese posted: 5 months ago

    • Yanmar 6ly2 STE 420

      This topic has 1 reply, has 2 voices, and was last updated by Rob Schepis 5 months ago

      August 26, 2018 at 4:55 pm I am Looking at formula 40 Pc with this engine set up yanmar 420 about 500 hours ? The valve issue I have been reading about fall with in these motors what is the fix? I know you need get wot up til 3400 what are the issue beside not rebuild able is it recommended to stay clear these models thanks

      Started by:  John gill


      1 Reply
      August 27, 2018 at 3:59 am There is only one serial number “issue” for the 6LY2(A) that I am familiar with. Serial # M56928 circa 2005 when the heads on the 6LY2A were improved using inconel valves. But that’s when they were calling it the 440, no longer the 420. Your serial number is way earlier than that head upgrade era. A remanufactured head should be available with the Inconel valves. You would have to contact Mack Boring or Mastry to check o…

      Last Post by:  Rob Schepis posted: 5 months ago

    • Diesel Soot

      This topic has 9 replies, has 4 voices, and was last updated by Tony Athens 6 months ago

      July 15, 2018 at 7:02 pm New member…Thank you for the add. 1988 Bayliner 38’ Hino 175s (N/A’s) with 21×19 4 blades. We cruise at 1850-1900 rpm 8.5-9 kts). If I am 2+ hours into an excursion, I will see soot off the port-side hull exhaust. The port side has house batteries, start batts and dinghy’ 25 hp outboard. Fuel consumption for both engines is great, temps fine, etc. K&N air filters-clean. RPM at max is about 2800. Mechanic checked inj…

      Started by:  cory shears


      9 Replies
      July 25, 2018 at 6:56 pm If it matters, I’m on Phil’s side as to additives……….. Remember, “There are some diesel additives that claim to help that??…………………………………CLAIM is a very big word when it comes to products along these lines.. Tony Tony Athens Seaboard Founder Go here for the latest stuff we put together and share for all to see: https://www.sbmar.com/t…

      Last Post by:  Tony Athens posted: 6 months ago

    • Exhaust Elbow Doomed?

      This topic has 9 replies, has 2 voices, and was last updated by Jerome Billett 7 months ago

      June 22, 2018 at 9:24 pm I’ve posted this question before about different boats/engines but this is another and I’m still not sure what to look for exactly. 1998 Jefferson 48. Volvo 72P-A motors. 430 HP. The raw water entrance to the elbow is high but sort of slopes down. Still doomed to fail? Also, anybody know what the P-A refers to on these engines? There is no throttle cable attached to the fuel pump lever arm so I presume there is an electronic control…

      Started by:  Jerome Billett


      9 Replies
      July 9, 2018 at 6:14 pm That sounds pretty reasonable. Certainly better than the jacketed doomed to fail ones that cost about $4500 from Cummins the last time I checked. Thanks again for all the good advice. JBB

      Last Post by:  Jerome Billett posted: 7 months ago

    • Pyro/boost install on Yanmar 6ly

      This topic has 12 replies, has 4 voices, and was last updated by Corey Schmidt 7 months ago

      June 24, 2018 at 7:05 am I am going to add a pyro/boost monitoring system on my 2006 Yanmar 6ly-stp (370hp) engines. Based on Tony’s advice, I know where to tap into the boost pressure and the pyro probe before the Turbo, however, I’d like the probe to go after the turbo. Is the cap seen on the mixer a possible pyro sensor install point or should I just put in before the turbo and not worry about sensor breaking off and blowing the turbo (if i put it before …

      Started by:  Eric


      12 Replies
      June 25, 2018 at 1:48 pm Read every article that we’ve created re: exhaust design and then construct a solid plan based on your available options (which includes available physical space)… that’s all you can do. You’ll have to think outside the box… https://www.sbmar.com/category/articles/exhaust-systems/ Re: your arduino… have you figured out how to read the milli-volt signal from the thermocouple? If not, I have a signal amplifier f…

      Last Post by:  Corey Schmidt posted: 7 months ago

    • EGT GUIDELINES FOR VOLVO PENTA TURBO DIESELS

      This topic has 3 replies, has 3 voices, and was last updated by Trevor Seal 8 months ago

      June 14, 2018 at 4:22 am I have pretty much typed my fingerprints off trying to find specific/generic guidelines for EGT readings…Volvo was no help….this is the first website/forum I have located that actually discusses specific EGT readings…I saw a data sheet on this website for a Cummins diesel that provided EGT readings…does anyone know if the same information is available for Volvo-Penta TMD 100As and if so, where ?? Any help would be apprec…

      Started by:  Trevor Seal


      3 Replies
      June 15, 2018 at 5:57 am Thanks David, appreciate the response….

      Last Post by:  Trevor Seal posted: 8 months ago

    • Replacement Tach for Yanmar

      This topic has 9 replies, has 3 voices, and was last updated by Bob Waters 8 months 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


      9 Replies
      June 6, 2018 at 3:06 pm Charles. I have the installation finished. I pig tailed the new sensor wire to the yanmar switch with a double spade. Works very good. Thanks, Bob

      Last Post by:  Bob Waters posted: 8 months ago

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