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- Cummins Marine Forum Topics
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Zero oil pressure on 6BTA
This topic has 3 replies, has 3 voices, and was last updated by
1 week ago
May 5, 2024 at 7:02 am I have a Meridian 408 with 6BTA Diamond Series engines (2004 year model). When I pulled into my slip six weeks ago, I had 20 PSI of oil pressure on my starboard engine at idle before I shut it down (I always keep records). When I started the engine for the first time yesterday, the gauge showed zero oil pressure and the alarm continued to sound so I shut it down. Since the oil pressure gauge and the alarm are on two separate senders, I have to a…
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in: Cummins Marine Engines
3 RepliesMay 10, 2024 at 2:43 am where are you pulling the oil pressure from (mechanical gauge). Try another gauge/verify?Last Post by:
posted: 1 week ago
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6cta8.3 pre heating
This topic has 4 replies, has 3 voices, and was last updated by
1 year ago
January 19, 2023 at 7:47 am I have a hydronic heat system onboard and want to pre hezt the motors via a heat exchanger circulation of engine coolant with a small 12v pump. The heater port connections that Tony has published are these suitable to circulate coolant while engine is cold? Are there better ports on the 6cta8.3 to use to preheat. The temp of the hydronic system is 143 to 165 F so should be good.
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in: Cummins Marine Engines
4 RepliesFebruary 25, 2023 at 8:06 am The hydronic pre-heat unit works great it takes 20 minutes to circulate the engine coolant through the heat exchanger and the engine is up at approximately 150 degrees F. no more smoke at start up! it took 2days for the install mounting the heat exchangers and installing mini valves and new hoses plus the electrical wiring and switches. I can post pics if anyone is interested. I had all the equipment purchased 10 years ago when we …Last Post by:
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Understanding exhaust hose & pipe dimensions, and making fiberglass tubing
This topic has 11 replies, has 5 voices, and was last updated by
2 years ago November 3, 2021 at 4:01 am I know Tony has a nice article which mentions some of this @ “https://www.sbmar.com/featured-article/everything-you-need-to-know-about-marine-exhaust-systems/” but I am still not 100% clear. I have a 4ā hose coming off my yanmar 316 6lpa mixing elbow (aftermarket cast 316 stainless, but identical to oem part in dimensions). So, this exhaust hose inside diameter is 4ā. If I install a lift muffler after this hose, therefore the ou…
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in: General Discussion
11 RepliesNovember 15, 2021 at 12:37 pm Right now the exhaust exits out the side of the boat, but close to the transom. I’m not sure that having a shorter run, if it doesn’t utilize any more height, can help the backflow situation. I have a couple ideas working with, which I will share, just didn’t get chance to do any work on it this last weekend.Last Post by:
posted: 2 years ago
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Marine diesel storage tank filtration
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago
November 12, 2021 at 1:35 pm Hey everyone! Was referred to here by SBMar for guidance on my question – This site has been a fantastic resource and helped me with taking care of our 1913 wooden motor yacht https://www.sbmar.com/articles/marine-fuel-filtration-the-seaboard-way/ I was wondering – has anyone performed this technique with diesel tank filtration on land? We have a 3000 gal diesel tank at our marina that’s approaching 20 years old and has never …
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in: General Discussion
2 RepliesNovember 15, 2021 at 8:35 am Thank you David! Our tank does hold fuel for a long time, our marine fuel tank exchanges 4-5k gallons a month, however in the diesel we consume maybe 200-300 gal a month Thank youLast Post by:
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Cummins 6bt black smoke debug process
This topic has 12 replies, has 9 voices, and was last updated by
2 years ago
October 6, 2021 at 11:38 am I’ve got a 1998 6bt that recently started to show black smoke at high rpm (at the dock and under way). There has been no change to prop or any other boat change and there has been about 3 weeks between a 150 mile trip and the first sign of this problem. The marine repairs guys in the area are booked out 5-8 weeks so I’d like to find out how to go about diagnosing the problem myself. Thanks Ron
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in: Cummins Marine Engines
12 RepliesNovember 2, 2021 at 7:25 pm It is a 1994 Cummins 6BT 210…… 1- it has run fine for years 2 On doc in neutral runs fine, brought it up to 2200 rpm, no issues. Turbo spins freely, had filter off and observed spin at @1800 rpm Under load (on the water) at @1500 rpm starts to black smoke cannot go above 1800 rpm, just smokes more. so at doc, with filter off and turbo spinning, runs o.k. under load does not. If it runs o.k. at doc at 2200 rpm does that rule out turbo…Last Post by:
posted: 2 years ago
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High coolant temp alarm
This topic has 3 replies, has 2 voices, and was last updated by
2 years ago October 17, 2021 at 4:41 pm cummins 250 CPL953 I get a high coolant alarm from my high temp switch on the exhaust manifold port. Engine alarm doesn’t sound from the original instrument panel. I will be installing the 1″ banjo at the turbo and line to the rear head coolant port. My question is…by increasing the flow out of the head to the turbo, what is done from the exhaust manifold to the circulation pump? I only see one outlet from the exhaust manifold …
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3 RepliesOctober 31, 2021 at 1:29 pm Discripive or not, your picture adds to my lack of understanding what you have.. I know the cooling system of a B very well but look as what you have posted:,, No clue as to what you have going on–Certainly nothing that I recogognize HX or keel cooled? Properly sized? Expansion tank location & size? De-aireartion or spitter lines to the expansion tank??? The one I see at the elbow at the thermostat outlet looks like it goes down or s…Last Post by:
posted: 2 years ago
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Sea Trial Numbers
This topic has 2 replies, has 2 voices, and was last updated by
October 17, 2021 at 4:10 pm 250 Cummins CPL 953 FWJAC Any comments on numbers are appreciated.
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2 RepliesOctober 29, 2021 at 9:37 am Thanks. Why do you point out 7-8kts? Curious, because at the point I’m only burning about 2+ gph. Is it the EGT, percent RPM, or something else. I do typically cruise at 8-9 kts. I do know the hull isn’t capable of higher speeds.Last Post by:
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6BTA max rpms under load
This topic has 10 replies, has 6 voices, and was last updated by
October 2, 2021 at 5:08 am 315 6bta, denso pump, 36′ downeast. I want to go from a 4 blade to a 5 blade prop to get more speed at cruise rpms. I understand that I want to be at 2925rpm fully loaded, WOT. I discovered yesterday with a strobe that, at cruise rpms between 1800-2400, my tach consistently reports 150 rpms higher than real engine rpms (ie, 2400 at gauge is 2250 by laser tach on harmonic balancer) My tach is showing 3200rpm at WOT (so assume 3050ish real r…
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in: Cummins Marine Engines
10 RepliesOctober 12, 2021 at 4:42 pm Thanks. But, I don’t think that is an adjustment. THat’s the set up for a mag pickup tach. DLast Post by:
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damper plate rubbing on gear
This topic has 4 replies, has 2 voices, and was last updated by
2 years ago
October 11, 2021 at 11:52 am IĀ“m having interference problems with a cummins 6bta and velvet drive. The damper plate (velvet drive) is rubbing against the gear (velvet drive 72C). Almost like there is supposed to be a gasket or shim between the adapter plate and the gear. Any help would be appreciated. D
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4 RepliesOctober 12, 2021 at 12:36 pm awesome, good luck to ya!Last Post by:
posted: 2 years ago
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Bleeding 1998 6BTA 5.9M1
This topic has 1 reply, has 2 voices, and was last updated by
October 11, 2021 at 12:18 pm I have struggled to locate the places to remove air after new fuel filters installed. Surely there is a pump somewhere on the engine to do this. Please help. Yes I should install the bulb system but my Bayliner 4087 has issues that preclude such a mod. Show me pictures if you can. Regards Bill.
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in: Cummins Marine Engines
1 ReplyOctober 12, 2021 at 5:58 am left side of engine, towards the after end. It’s the first thing the fuel hose goes to. After that, follow the line to filter housing, then IP. You should see points along the way where you can bleed air from. DLast Post by:
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reverse gear ideas
This topic has 1 reply, has 2 voices, and was last updated by
3 years ago April 26, 2021 at 8:25 am Presently running a 6BTA 250hp cummins in a workboat. It has a velvet drive 2.5:1 gear. I’m looking to upgrade the gear to something more robust. I’ve seen a few MG506/507s around. I’ve been advised that these might be a good candidate for replacement. Most likely the boat will need a new shaft to make up the different case measurements. I am also thinking of changing the gear ratio to 2:1 to bring a new prop to 23″ squar…
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1 ReplyMay 1, 2021 at 5:27 pm The MG506 & MG507 are both “good ol” gears, but both have been out of production for over 20 yrs now.. Lots on them still around and both are easy to rebuild as gears go as long as the gear is in “still working condition” and is not a total rust bucket. With that said, the MG507 would not be an easy gear to adapt to any B series Cummins ( clearance issues with the turbo and possibly other things). From experience, th…Last Post by:
posted: 3 years ago
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Bleeding Fuel System 6BTA 250 hp
This topic has 8 replies, has 4 voices, and was last updated by
3 years ago
August 2, 2018 at 6:12 am I guess my valve to switch between tanks was lose, in some rough seas last night the valve managed to move about 1/4 turn to where it ran my 6BTA out of fuel. My mission today afterwork is to get her started again. Any tips on bleeding the fuel system?
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in: Cummins Marine Engines
8 RepliesNovember 19, 2020 at 2:17 am Hi Jamie, I need help bleeding my 6BTA. I found the pump etc, but is there a bleed screw somewhere?? Thanks in advance. BillLast Post by:
posted: 3 years ago
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hydraulic pump install
This topic has 4 replies, has 3 voices, and was last updated by
3 years ago September 22, 2020 at 6:20 am Any advice on installing a 24gpm gresen hydraulic pump on the front end of my 250 6bta cummins. Presently have a 12gpm pump run off the dual pulley adapter on the front crankshaft. As anyone with a pulley driven accessory it is less than desirable. Engine is hard mounted. Does the small drive shaft need to be exactly square to the crankshaft or is a small angle needed for cv joint articulation/lubrication? Driveshaft guard needed? Special tool …
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4 RepliesSeptember 22, 2020 at 11:20 am I really don’t know why the offset to be honest. I used a digital protractor. pretty easy to set up. you can just change the rings in your pump and get 24 gpm. The drive shaft is the best way to go but a lot of work to convert over to it.Last Post by:
posted: 3 years ago
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Ground Wire
This topic has 5 replies, has 4 voices, and was last updated by
3 years ago June 10, 2020 at 5:26 am What is the “best” spot to attach the negative cable on the engine? Mine is on the rear head bolt and I suspect it isn’t the best spot. Thinking of starter bolt. Also, bolt size if know so I can order the correct lug for the cable. Thanks in advance. D
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5 RepliesSeptember 22, 2020 at 10:59 am David Wesner wrote: curious, why lithium grease? thx D Just an old school OEM protectant for cable connections and the like, if you have a non-conductive flavor of choice go ahead and use it.Last Post by:
posted: 3 years ago
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4LH sudden power loss
This topic has 1 reply, has 1 voices, and was last updated by
August 2, 2020 at 3:09 pm Last week ran the boat from the yard to the mooring. Ran it at cruise, 3000RPM for about an hour then the engine suddenly lost power and died. Immediately thought of fuel filters but was surprised at the abruptness. Bled lines, cracked injectors and got it running. Unable to power up again, idled to mooring which was pretty close. Next day, changed the RACOR and secondary. Racor was pretty clean, secondary was pretty dirty. No change, no power. …
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1 ReplyAugust 2, 2020 at 6:06 pm suspect check valve in lift pump on outlet? Thoughts?Last Post by:
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cummins 6BT 5.9 oil pan drain plug leak
This topic has 4 replies, has 3 voices, and was last updated by
3 years ago June 19, 2020 at 3:31 pm I have a pair of 1987 cummins 6BT 5.9M (210 hp)with the larger oil drain pan. Many years ago I added four sided brass drain plugs with outlets on each side and a hose from one of the outlets to an oil change pump. In all of those years the drain plug has wept small amounts of oil from the drain plug/oil pan interface. I have tried a number of different washers – copper, aluminum, fiber – but have not been able to stop the leaking…
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in: Cummins Marine Engines
4 RepliesJuly 19, 2020 at 4:54 pm I really have no clue what I an looking at other than it’s something that is not Cummins.. I can’t even tell what oil pan option I am looking at. A flat marine aluminum oil pan, or one of the truck type stamped steel oil pans.. Nor can I tell where this fitting is on what ever it is I am looking at.. I’m here to help, but before you post pics–Look at them and say to yourself what the other side of the post will “s…Last Post by:
posted: 3 years ago
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6bta coolant level
This topic has 6 replies, has 5 voices, and was last updated by
July 15, 2020 at 12:28 pm What level should the coolant be, in the expansion tank, cold? Should it be like 1″ below the cap to leave room for expansion, or totally full? I have searched the forum and see reference to keeping it below the “spitters” but not a specific recommendation. I run the 160 stats and IR gun shows 165 at the tank under warmed up load…just want to be sure my level is good. TY!
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6 RepliesJuly 19, 2020 at 8:27 am I use a murphy level switch tied to an audible alarm. Cummins 250 JWAC engine with keel pipes. DLast Post by:
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High coolant temp and low oil pressure alarm
This topic has 2 replies, has 2 voices, and was last updated by
March 28, 2020 at 6:58 am I’m getting a high coolant temp and a low oil pressure alarm when the engine warms up. I’ve confirmed this is not actually happening with a mechanical gauge and an IR temp gun. Also, I have a secondary set of alarms purchased here at Seaboard. I do believe this is ground issue. Any pointers on where to look? Using the voltage drop method with the DVMM is the best way to trace it out? I believe the panel ground goes into the harness …
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2 RepliesJuly 19, 2020 at 6:40 am So… looked through some schematics and saw how it was wired. Instead of chasing the wire loom, I jumped the ground from the negative bus to the ground connection on the IC board. Seems to have fixed the false alarms. Iāll take some voltage potential readings to confirm. The wire loom has some ground connections on the starter that look fine. Suspect connectors or…unused ground for the fuel stop solenoid. DLast Post by:
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waste gate purpose?
This topic has 1 reply, has 2 voices, and was last updated by
4 years ago March 29, 2020 at 4:54 am So, some engines have them, some don’t. I understand the principle, but am unclear “why”. My best….thoughts are that the air stream velocity could float the valves??? D
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1 ReplyMarch 29, 2020 at 8:02 am To allow more boost at lower engine output, gives a much fastest torque rise (like in the 1200-1800 RPM range ) when accelerating trying to get up on plane ( that also lowers dark smoke big time) but limit the boost at high power output/WOT where the waste gate can open to limit boost and limit compressor turbine RPM.. The linkage movement is very small and not easily seen.Last Post by:
posted: 4 years ago
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6BTA JWAC 250Hp
This topic has 4 replies, has 5 voices, and was last updated by
4 years ago March 2, 2020 at 8:46 am How often should the aftercooler be cleaned on this engine? Regards Joe Carp
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in: Cummins Marine Engines
4 RepliesMarch 8, 2020 at 11:00 am David, That’s the clean side.. It’s very difficult to really see the intake side and it can really get dirty, yet show not signs on the bottom.. Think of this design of aftercooler as an metal mesh air filter… Intake side (top) catches all the crud… As to cleaning–lots of ways–solvents, ultra-sonic, hot tanks, etc.. We tend to cap the intake side, turn it upside down and fill it up with a solvent ( although …Last Post by:
posted: 4 years ago
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Zero oil pressure on 6BTA
