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    • Cummins Marine Forum Topics
    • 160 degree thermostat doesn’t work

      This topic has 3 replies, has 3 voices, and was last updated bydonald roth 1 day ago

      May 9, 2024 at 3:32 pm I have 6BTAs that ran 195-200 degrees. They were always within a few degrees of each other. Higher when FL water temps are elevated in the summer. For safety, I replaced my 180 degree stats with SMX 160 degree stats. Now one engine runs cold @ 140-150 and other hot @ 195-200. Impellers are new. Fuel coolers clean.  After coolers and trans oil coolers spotless. Just did heat X maintenance on engine running hot. Replaced antifreeze. Did exact same…

      Started by: Thomas whittemore in: Cummins Marine Engines

      3 Replies
      May 16, 2024 at 9:37 am “Ghost” pieces of impeller can hide in the raw water works, and even on the pump intake side.  <br />Have you looked inside the heat exchanger?  Broken off zincs can block flow there, and while there check the condition of the tubes.                                       Go through the entire raw water circuit from intake fitting to exhaust mixer.

      Last Post by: donald roth posted: 1 day ago

    • Smokey 6BT

      This topic has 2 replies, has 3 voices, and was last updated bydonald roth 1 week ago

      May 6, 2024 at 8:32 am I have an early 6BT (CPL 742) in my 1987 Albin 36 trawler.  It’s been going through a refit for the past two years.  My wife and I just completed a 1,100-mile shakedown cruise to FL and back to our home in NC.  It’s always been a little smokey so I researched some possible causes.  The smoking is both on a cold start and after a day of cruising. I replaced all the old (probably original) 9mm injectors with new Cummins injectors (CPN …

      Started by: browntw.79 in: Cummins Marine Engines

      2 Replies
      May 10, 2024 at 2:58 pm Have you considered that you may be overpropped?  <br />Fuel burn seems high for a low hp B motor, and black smoke is another indicator.  

      Last Post by: donald roth posted: 1 week ago

    • Rust in Coolant pipe

      This topic has 2 replies, has 3 voices, and was last updated byClark Leighs 1 month ago

      April 4, 2024 at 10:12 am Took the heat exchanger off my 6bta to get cleaned. Going to reinstall it with all new hoses and found the pipe leading to the thermostat to be extremely rusted. Anything I should do for this issue? Or just flush remaining coolant as much as possible and fill with new?  

      Started by: Blake H in: Cummins Marine Engines

      2 Replies
      April 8, 2024 at 11:57 am If you can, take a sample of the so called coolant and send it to an oil testing  lab.  Yes, they do coolant testing also. Heavy rust like that says you have had seawater enter the engine which could do interior damage. Pressure test the system for leaks. Remove as much rust as you can.    Then use a product such as Cummins cleaner,  RESTORE, following directions for treatment AND removal/flushing.   Be prepared to do it a couple of times.     R…

      Last Post by: Clark Leighs posted: 1 month ago

    • Constant Torque Hose Clamps

      This topic has 7 replies, has 6 voices, and was last updated bySteve Lewis 1 month ago

      March 27, 2024 at 9:14 am Curious if there is any specification or guidance on tightening these hose clamps.  My impression is that the spring needs to have some give both to tighten and loosen to allow expansion.   Anyone have any advice vs just tightening them ‘tight’ like normal hose clamps.

      Started by: Zac Schramm in: Cummins Marine Engines

      7 Replies
      April 3, 2024 at 4:53 am The tool that FireIsland1 indicated shows a torque of 60 inch pounds( as pictured on amazon) which is in range favoring the higher end.  I will add that tool to my kit.  Thank you all for some good ole learning.

      Last Post by: Steve Lewis posted: 1 month ago

    • New Boat, and Propping 1 2

      This topic has 31 replies, has 6 voices, and was last updated byShannon Ritzert 1 month ago

      October 19, 2023 at 9:18 am I recently purchased a new boat to me. Its a 31′ Bertram FBC. It has 2003 Yanmars 6LYA-STP 365 H.P. Each engine has right at 700 hrs on them. The gears are zf models 220A, ratio is 1.75:1 and she is propped at blade 22 x 24 x 1.75. I was told when lifted at the yard, that she weighs 18k pounds. It also refit by Cabrera Yachts in 2003. They tunneled the hull as well. This boat reminds me of Shooter that Seaboard refit. The old owne…

      Started by: Shannon Ritzert in: All Other Marine Diesels

      31 Replies
      April 2, 2024 at 8:15 am Any thoughts or suggestions?

      Last Post by: Shannon Ritzert posted: 1 month ago

    • Low power low rpm

      This topic has 19 replies, has 6 voices, and was last updated byFrank Unsicker 1 month ago

      September 8, 2023 at 12:48 pm I have a 40ft vessel with twin Cummins 6bta engines.    My port engine low power/low rpm compared to Starboard.     Port takes a while to get up to 2600 rpm while putting out black smoke, white starboard gets up to 3100 rpm almost as fast as you push the throttle.  (The props were lowered from 22×22 down to 22×20 which allowed 3100+ rpm on both engines at the time.) Before I read Tony’s article on low power Idid the following: 1. Disas…

      Started by: Frank Unsicker in: Cummins Marine Engines

      19 Replies
      April 2, 2024 at 7:43 am After all the items I tried, it turns out to be a simple fuel supply issue.  The fuel hose from the Racor to the fuel transfer pump had a major kink.  I’m sure this was self inflicted.  When I removed the fuel coolers I rerouted the fuel lines to make access to the water pump ect.. easier and created a sharp bend in the fuel line.  Oh well live and learn!

      Last Post by: Frank Unsicker posted: 1 month ago

    • Engine Room Corrosion Inhibitor

      This topic has 8 replies, has 6 voices, and was last updated byRichard Dodson 1 month ago

      March 9, 2024 at 6:36 pm Can anyone recommend a good product to use for wiping down the engines/gears to prevent corrosion?  Battling some spot rust here and there with these big temperature changes this time of year in the south.   Maybe a good wipe down with some WD40 would help?  

      Started by: Patrick Mangum in: General Discussion

      8 Replies
      March 28, 2024 at 11:28 am The WD in WD40 stands for water displacing. It leaves very little corrosion prevention once it has dried. It was not certified for use in the Navy for that reason. 

      Last Post by: Richard Dodson posted: 1 month ago

    • 12v or 24v Alternator For QSC 8.3L with a 24V starter bank

      This topic has 5 replies, has 5 voices, and was last updated byGene Fuller 2 months ago

      March 9, 2024 at 3:23 pm New to forum. Hope this question falls within the bounds. Have recently acquired a Nordic 44 with a 24v starter battery bank (two 12s in series) for a 600 HP, Cummins QSC 8.3L.  Recently, had an alternator failure while on a trip.  Replacement alternator (that a dockside mechanic put it in) was labelled 12V.  Was this an error?  Don’t I need a 24V alternator to charge my battery bank?     Thanks,   Michae

      Started by: Michael Cunningham in: Cummins Marine Engines

      5 Replies
      March 14, 2024 at 6:51 am The standard configuration for the Nordic Tug 44 has been 100% 24 volt since its inception about 10 years ago. (Update from the previous Nordic Tug 42). Of course these are highly custom boats so anything is possible. However, it is very likely to be a completely 24 volt system, including all engine and battery related items as well as lighting, appliances, etc.

      Last Post by: Gene Fuller posted: 2 months ago

    • overheated 4bt

      This topic has 14 replies, has 4 voices, and was last updated byShannon Ritzert 2 months ago

      January 27, 2024 at 10:47 am Late last summer, I had an idler pully bearing seized up, slung a belt, then I had a major overheat.   I pulled the exhaust manifold, turbo, and head.  I bared the head, and block, and didn’t have any warpage.  As you can see, the pistons were not melted down.  There was some surface rust, and cylinder scaring.  Against my judgement, my partner on the boat just wanted to put everything back together so he could use the boat. I installed a …

      Started by: Shannon Ritzert in: Cummins Marine Engines

      14 Replies
      February 29, 2024 at 3:32 pm My machine shop told me: Block is the same Crank is the same Rods are the same Heads could be different Cam could be different Pistons are different

      Last Post by: Shannon Ritzert posted: 2 months ago

    • 6BTA Identification

      This topic has 1 reply, has 2 voices, and was last updated bydonald roth 3 months ago

      February 2, 2024 at 8:58 am First off hello to all and thank you for the help in adavance. We have recently purchased a 1995 Luhrs 350 with 6BTA’s that where “rebuilt” about 300hrs ago. The person we purchased from only had for about 5 months before life circumstances required them to sell. All of the work done was prior to there purchase (was done about 1.5-2 years ago) but I have lots of recipts showing work done. Eninge parts,labor receipts,soft goods,…

      Started by: Mike Newsome in: Cummins Marine Engines

      1 Reply
      February 4, 2024 at 3:23 pm I’d be worried about that loose motor mount, old swollen hoses, and crushed up air filter as well.  

      Last Post by: donald roth posted: 3 months ago

    • Metal in fuel

      This topic has 3 replies, has 3 voices, and was last updated bydonald roth 3 months ago

      February 2, 2024 at 12:36 pm I’m looking for some advice with a problem I’m having with my yanmars. I have a 2001 32 albemarle with twin yanmar 6lya-ste with approximately 1350 hours. For filtration each engine has a racor 900 with 10 micron filters and then the on engine yanmar filter which Im unsure of the micron rating. <br /><br />Over the summer I thought I may have gotten a tank of dirty fuel from one the marinas I travel to. The racors which normally last…

      Started by: Steven F in: All Other Marine Diesels

      3 Replies
      February 4, 2024 at 3:13 pm Metal in the return lines are probably debris that were in the lines when the system was installed.  If the HP pump was spitting metal, there would be other obvious symptoms.  If the debris were coming from the tanks, your filtration system has failed miserably, but those debris couldn’t pass through the pump without causing damages anyway.  

      Last Post by: donald roth posted: 3 months ago

    • 6BTA (270) Oil in the air cross over

      This topic has 7 replies, has 4 voices, and was last updated byTony Athens 3 months ago

      January 24, 2024 at 6:45 pm My boat is a 2000 Mon 36 trawler.  I pulled the air cross over for the first time since I have owned the boat  (2 years) to check the valve lash and discovered oily residence.  So after viewing the various posts on this site, checked the air filter and turbo intake.  Slight oil in the turbo intake.  Checked the turbo and not movement axially or radially.  Spins freely.  My current crankcase vent is to a container (been that why for the 20+ years…

      Started by: David Waugh in: Cummins Marine Engines

      7 Replies
      January 30, 2024 at 5:57 pm Rectorseal 5 on all

      Last Post by: Tony Athens posted: 3 months ago

    • Possible Dirty Injectors

      This topic has 3 replies, has 4 voices, and was last updated byFrancis Valerio 4 months ago

      December 22, 2023 at 5:59 pm Have a pair of 6BTA5.9M2 engines in our boat. Factory stock at 315 Hp/2800 rpm. I bought in late 2016 with 750 Hrs on each. Just ran NJ to Florida and they run great, currently about 1500 Hrs on both, no oil use (using 15-40), oil stays clean between 100-150 Hr changes (no notable blow-by), both make 2800 at WOT under load with no smoking. Coolant temps under load for both are 178-184 F. Oil temps under load for both are 190-205 F. Very minor li…

      Started by: Blair Bugher in: Cummins Marine Engines

      3 Replies
      January 10, 2024 at 7:12 pm I will agree with possibly the trans cooler and to at least give it a look. If you ran from NJ to Florida I would have to say you blew the carbon out of it on that ride but…with that said, these are old school engines (but they are awesome) and if carbon builds up on the piston tops it can cause a sheen in the water from some unburnt fuel getting spit out the exhaust.  This happens from excessive idling and/or running overloaded. It is ver…

      Last Post by: Francis Valerio posted: 4 months ago

    • Fresh water supply flow rate for Sherwood pump on CAT 3126 TA

      This topic has 8 replies, has 5 voices, and was last updated byMarcus Teipel 4 months ago

      December 13, 2023 at 4:08 pm I subscribe to the value of fresh water flushing my CAT 3126 TA engines every time I return to port (the boat lives in a Salt Water environment).   I have purchased and installed 3 of Tony’s bronze fresh water flush caps for Groco ARG series strainers (one for each engine and one for the generator). I consider my fresh water supply volume and pressure at the boat house to be strong (sorry no objective water flow rate data available) &…

      Started by: Marcus Teipel in: General Discussion

      8 Replies
      December 26, 2023 at 3:34 pm Thanks Gene.   Upon reflection what you say makes perfect sense. 

      Last Post by: Marcus Teipel posted: 4 months ago

    • Turbo/Manifold Coolant Leak

      This topic has 4 replies, has 3 voices, and was last updated byScott A 7 months ago

      September 19, 2023 at 12:19 pm Last year, had a new turbo installed on a 330 6BTA.  The guy who did it used black RTV instead of red.  Had a small leak last year that was fixed by tightening the nuts after a few hours of running.   This summer, the leak has come back.  Very small leak but it seems to be coming from the same area (turbo/manifold seal).  Coolant pools in the little depression on the engine block directly beneath the manifold/turbo connection.  Nuts are all tigh…

      Started by: Scott A in: Cummins Marine Engines

      4 Replies
      September 29, 2023 at 2:06 pm To followup on the leak issue.  When inspecting all nuts again, I found three nuts tight.  I then had to disassemble the raw water pipe running under the turbo/manifold bracket to get a good purchase on the “hard to reach” nut and got about a quarter turn on it with good leverage.  Leak stopped.  I’ll wait until the winter and likely to a full disassembly and fix. 

      Last Post by: Scott A posted: 7 months ago

    • New boat, Starboard engine overheating when pushed hard

      This topic has 5 replies, has 5 voices, and was last updated bypwrobert 9 months ago

      August 15, 2023 at 2:42 pm Hello, so I received my boat last week and it is a Viper 303 built in 2013 with twin Cummins 2.8l 216hp units. I am very happy with the performance and everything but noticed that the starboard engine is running hotter than the port-side engine, especially when pushed at more than 65% throttle. So port side engine runs at around 80 degrees Celsius (or 176 Fahrenheit) when pushed hard and does not exceed that generally and the starboard engine ru…

      Started by: Maximilian Haupt in: Cummins Marine Engines

      5 Replies
      August 20, 2023 at 3:49 pm Tony has a wealth of info about many of the common cummins Engines. Also a section titled getting to know your engine. Engine schematics and pictures of most of the most often parts requiring service or inspection.  this Forum has a wealth of info and hundreds of members who are knowledgeable and willing to help. But certain basic lingo and familiarity of what you hAve helps us all help you. 

      Last Post by: pwrobert posted: 9 months ago

    • Stuffing Box getting hot 1 2

      This topic has 22 replies, has 7 voices, and was last updated bydonald roth 9 months ago

      July 28, 2023 at 9:11 am I recently had a major failure of my dripless so I had my local marina install a traditional stuffing box. I haven’t been able to run the boat above idle because the stuffing box is getting quite hot (can’t hold my fingers on it for more than a few seconds) even though there is plenty of water dripping. Brought it back to the yard and they’re telling me it needs an alignment…. obviously the alignment should’ve been looked at before finishing the…

      Started by: Blake H in: General Discussion

      22 Replies
      August 15, 2023 at 6:25 pm You could drill and tap the fiberglass tube behind the gland to accept a water feed fitting. Id recommend to remove the unknown packing and reinstall with a high quality product according to Tony’s Tips instructions. Polishing up the shaft where it goes through the packing might help too.    

      Last Post by: donald roth posted: 9 months ago

    • Cummins 6BTA won’t start cold

      This topic has 10 replies, has 6 voices, and was last updated byTony Athens 10 months ago

      June 8, 2020 at 4:51 pm I’m having an issue with my 6BTA on my wellcraft, I got bad fuel last year and replaced all my primary and secondary fuel filters, for some reason the motor won’t start when it’s cold or will take forever to start unless I spray the turbo filter with ether. Once the motor is warm it starts on a dime and all the tempuratures and pressures are perfect and the motor tops out at correct RPM. I replaced the mechanical lift pump and I am still having …

      Started by: Erik Killen in: Cummins Marine Engines

      10 Replies
      July 11, 2023 at 5:17 pm That’s a basic start…… Looks clean as to paint and stuff, but  still leaves way to much out for me to add some real help..  A simple Dissecting of what you have below tells me the STB motor is missing “heat” during the cranking mode mode at this point.————————-So where do we go from here?  Let’s get a  250W oil pan heater on the oil pan of that engine and run it …

      Last Post by: Tony Athens posted: 10 months ago

    • Water flow alarm

      This topic has 4 replies, has 3 voices, and was last updated byLew 10 months ago

      June 28, 2023 at 1:50 pm Hi, can someone recommend a simple to install water flow alarm or something to notify should my raw water pump fail underway? thx 

      Started by: Lew in: General Discussion

      4 Replies
      July 9, 2023 at 5:58 pm B series 330 hp, recreational application about 200 hours a year.  thx – Lewis

      Last Post by: Lew posted: 10 months ago

    • 4bta low power and rpm 1 2

      This topic has 30 replies, has 10 voices, and was last updated byBrandon Cassady 10 months ago

      August 27, 2021 at 3:45 am Hey everyone, I’m having an issue with one of my engines. The boat is an ‘01 Carolina Classic with twin Cummins 4bta’s, Cpl 2197. The boat starts and idles fine and will rev fine in the slip with no load. When I try to get on plane the port rpms hang up around 1700 while the stb continue to rise. The first time this happened I pulled back immediately because I wasn’t sure if this would damage something. I had a local diesel mechanic take a look …

      Started by: Brandon Cassady in: Cummins Marine Engines

      30 Replies
      July 5, 2023 at 11:14 am A local place in Severn, MD called Arundel Diesel and Performance. 

      Last Post by: Brandon Cassady posted: 10 months ago

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