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6bt5.9m SBMAR tensioner bouncing
This topic has 10 replies, has 4 voices, and was last updated by
1 year ago
December 2, 2022 at 10:09 am The tensioner is 7 years old. Probably 2000 hrs. Both engines do the same thing. Is this normal? Thanks, Dave
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in: Cummins Marine Engines
10 RepliesDecember 4, 2022 at 10:46 am I bought it of you guys as part of the belt mod you recommend.Last Post by:
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Proper 6bta heat exchanger cleaning
This topic has 4 replies, has 5 voices, and was last updated by
1 year ago November 13, 2022 at 2:12 pm Pulled my starboard heat exchanger off and it looks pretty good compared to some Iāve seen, but before I repaint and reinstall what is the best way to clean the tubes while itās out of the boat? Ā Is an hcl soak ok for the entire assembly or not needed? engines are 5.9 6bta m3ās 330hp.Ā
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in: Cummins Marine Engines
4 RepliesNovember 25, 2022 at 8:46 am Replacing with new is over the top in my opinion. The H Ex does not fail catastrophically. Sure proactive replacement of a gear cooler is recommended, especially on the motor oil gears that run full operating pressure on the cooling circuit but a heat exchanger can get a full service and testing on the bench. Ā I understand everyoneās spending habits are different as are their desires to turn wrenches but a blanket statement to simply replace a n…Last Post by:
posted: 1 year ago
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Cold Wx diesel treatment 6CTA
This topic has 7 replies, has 6 voices, and was last updated by
1 year ago
November 6, 2022 at 1:34 pm Leaving the boat in the water for the winter in Rhode Island Last time I did that in late Dec on another boat the diesel jelled and since the tanks were topped we had to spend a whole day warming up the entire boat to be able to get it to start. Good times. Power Service has a cetane boost/antigel product that claims is is endorsed by Cummins, https://powerservice.com/psp_product/diesel-fuel-supplement-cetane-boost/ Any experience on using it? a…
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in: Cummins Marine Engines
7 RepliesNovember 24, 2022 at 7:57 am Hi Todd, nothing really special that you need to change filter often.Ā This is simply a good additive.Ā I change my primary racor every time I fill up.Ā In my mind, it $10 on a $300 tank full of diesel.Ā Some people think I am nuts, which I am, but I have done this for years and never have a fuel issue. I also am religious about Power Service and it has worked very well for me. Maybe we see each other on the high seas.Ā Happy Thanksgiving. …Last Post by:
posted: 1 year ago
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6BT T stat housing & Coolant pump sealant?
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago January 16, 2022 at 9:08 am Just purchased the 160 degree T stat package from SB.Ā I will be doing work to my HX and coolant system in the spring.Ā No overheating issues, just 22 years old and a good time to change up.Ā I have a new coolant pump with O ring for the 6BT in the shop.Ā My question, what would be a good sealant to use on the metal to metal surface of the T stat housing and the coolant pump flange to the block?Ā Reto-seal, yellow or blue?Ā Or is there another p…
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1 ReplyJanuary 21, 2022 at 8:02 am Yellow RECTORSEAL #5Ā Ā on everything including the bolts,ĀLast Post by:
posted: 2 years ago
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Cummins 6BTA 1989, with Startmotor Delco Remy 28MT
This topic has 5 replies, has 3 voices, and was last updated by
2 years ago
January 3, 2022 at 5:38 am Hi. I have 2 Cummins 6BTA 1989, with Startmotor Delco Remy 28MT. Now i need to hammer on one of the startmotor to make inn crank/spinn, so guess I need a new one.. Anyone know if 31MT is ok? (sn 61005265) Its also seems to have inplace startrele, so guess the old one can be removed..Ā Looks like 29MT is the new 28MT…? And 31MT is even bether?Ā Regards Richard Meyer, Norway
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in: Cummins Marine Engines
5 RepliesJanuary 20, 2022 at 4:38 am A little update from Norway Just got the 31mt from US, and installed it.It startet so quick that I first thought is was something wrong (was is just start engine running?? But the engine startet like a hot knife in butterĀ (minus degress and no power on throttle..)So could not be more happier (It was no start rele on the starter.. ButĀ I reused my own. Its pretty new..)So conlusion is that the Upgrade starter is awesomeĀLast Post by:
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2 batteries, one selector switch
This topic has 4 replies, has 2 voices, and was last updated by
4 years ago
December 25, 2019 at 7:57 am Merry Xmas to all. I have a simple question, and one I am sure I know the answer but would love to hear it from others who are better suited to answer. I have a Cummins 6BT with two 4D batteries. I have a simple selector switch, battery 1, battery 2 and all. My question, with this set up, I assume there is no house and engine battery. When on 1, 1 does both. When on 2, battery 2 does both. Correct. And the opposite battery from which is …
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4 RepliesDecember 26, 2019 at 12:16 pm OK, Keep in mind my comments about the alternator output at engine idle speeds. I have seen people caught on that because they did not understand that the alternator MUST be run at a far higher engine rpm than idle to produce any appreciable current with the result the batteries don’t get charged, actually continue to discharge, even though the engine was run for many hours..Last Post by:
posted: 4 years ago
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Tony, you got a shout out!
This topic has 2 replies, has 3 voices, and was last updated by
November 1, 2019 at 3:57 am Hey Tony, In On The Water magazine there was an article on preventive maintenance by Larry Backman. He gave you a great shout out, said “Tony is the internet God of diesels..” Thought you like to know. And I am sure many others feel the same way, I do for sure! Thanks for all the help. John Hobby Martha’s Vineyard, MA
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2 RepliesDecember 5, 2019 at 7:10 pm +2 I didn’t see the shout out but I agree.Last Post by:
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Fleetgaurd LF3894 oil filter capaciity
This topic has 6 replies, has 4 voices, and was last updated by
4 years ago November 24, 2019 at 6:35 am Hi guys, Does anyone know the capacity of the B series Fleetgaurd LF3894. Thanks in advance. John
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6 RepliesNovember 24, 2019 at 1:53 pm Oil Filter capacity is not related to OIL PAN CAPACITY and does not affect how your dip stick is marked, or “should be marked”.. Install 2 or 3 LF3894 filters in parallel on your engine and your oil pan capacity and dip stick markings will not change——————————————————-Only your SYSTEM capacity will increase. Oil Pan Capacit…Last Post by:
posted: 4 years ago
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Water Jacket Aftercooler Maintenance
This topic has 8 replies, has 3 voices, and was last updated by
4 years ago October 27, 2019 at 5:33 am I have 1989 Cummins 6BTA 250 HP engines (~1300 hours) with a water jacket aftercooler. The engines have been creeping up in temp over the past few years getting to 190 – 195 when they should be at 180. I’ve done all the routine things to address this: cleaned heat exchangers, replaced impellers, new raw water pump, new coolant, replaced themostats, and still no change. The last thing to check is the aftercooler, anything else? …
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in: Cummins Marine Engines
8 RepliesOctober 30, 2019 at 2:48 am “Amazing the modifications that can be made for improvements and why it wasnāt done better at the start.” Cummins is just like us —- there is always room for improvement.. TonyLast Post by:
posted: 4 years ago
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Black smoke
This topic has 2 replies, has 3 voices, and was last updated by
October 24, 2019 at 8:16 am Getting a lot of black smoke and low power on a Cummins 6BT5.9
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in: General Discussion
2 RepliesOctober 24, 2019 at 9:38 am Have you checked your turbo. Is it free spinning when you reach your hand in there and spin the turbine. Should be free. I sometimes had issue with a stuck one on a Yanmar. Little spin and she would be good to go. Always let the boat cool down before shut down. Helps with the turbo and oil in the bearing.Last Post by:
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Raw water impeller tool
This topic has 5 replies, has 4 voices, and was last updated by
4 years ago
October 14, 2019 at 5:03 am Hi to you all. Just was told about a impeller installation tool sold by impellertool.com. Guy said it was the bomb for install. Have not priced it yet but wonder if anyone has ever ordered and used this prior to me diving in. Cummins 6BT 5.9M. Sherwood 10615 impeller, key style. Thanks, John
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5 RepliesOctober 21, 2019 at 10:01 am I bit the bullet and bought the impellertool.com last year after wrestling with my port engine impeller (really difficult access = no leverage). Like everyone, I’ve tried hose clamps, zip ties, lube, and brute force… yeah, that works, but I always lost some skin on my knuckles and created a few new combinations of cuss words! Only caution is that it still takes a little effort to hold the impeller in place on the shaft as you pull th…Last Post by:
posted: 4 years ago
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6BT fuel lift pump
This topic has 1 reply, has 2 voices, and was last updated by
4 years ago October 20, 2019 at 6:49 am Good morning. Question on the fuel lift pump on my 6BT. I have no starting issues, starts right up. Run just fun, so no issues there. I will be changing the fuel filter. Last Friday I actuated the hand pump lever on the lift pump for the heck of it. Seemed to move very free with no pressure as I would of thought it would have. Up and down like nothing was restricting the movement. My question: Is this normal or is there something wrong…
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1 ReplyOctober 20, 2019 at 9:56 am The lift pump lever inside the engine rides on a CAM.. If the engine happened to stop with the “lever” on the cam, then the mechanical pump lever will feel totally limp–“NOTHING”.. Plus, if the vlever does work, than at best it’s pretty weak at best and slow to react or recover from the little bit it pumps.. An “outboard” type squeeze bulb does 3-4X the pumping with way less effort.. TonyLast Post by:
posted: 4 years ago
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Sherwood M71 on 6BT
This topic has 2 replies, has 2 voices, and was last updated by
October 19, 2019 at 1:28 pm Hey guys, Again, new to this boat and the 6BT 5.9M. Great motor! 440 hours. Preparing for spring. Just winterized yesterday. Check out the pic attached. Just want to hear it before I go there. Want to replace impeller. #1 Disconnect upper and lower hose. #2 Do I un-bolt entire unit from gear train and then remove the neck transition piece to replace impeller? No typical cover plate. #3 Then lash the gears back when replacing, all done?…
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2 RepliesOctober 19, 2019 at 2:01 pm Hey Bill, kinda felt the same. Jus wanted to get a handle on it. Only one engine, thank god, two would kill me!Last Post by:
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Zincs on 6BT 5.9M
This topic has 6 replies, has 3 voices, and was last updated by
4 years ago October 12, 2019 at 11:09 am Hi to all. New to the forum. Purchased a 1999 Eastern with 6BT 5.9M. My question, only one zinc in heat exchanger. That is what I have seemed to determine. Am I right? I have a PSS and I would assume they took the other zinc location and ran the cooling line. I am used to Yanmar ^LPA that had several zincs. Would appreciate any info. Love the Cummins, 392 hour when I bought the boat, got 440 now. Thanks
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6 RepliesOctober 12, 2019 at 3:15 pm John Hobby wrote: Hey Rob. One other thing. My parts guy has sold me a Camp 2E. Is that the correct length you think? Thanks. John Yes that would be “E2” John but will need to be trimmed to avoid bottoming out. See the second link I posted above, we talk about sizing and I posted a size chart.Last Post by:
posted: 4 years ago
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6bt5.9m SBMAR tensioner bouncing
