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- Cummins Marine Forum Topics
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Prop shaft seal options for super tight space?
This topic has 8 replies, has 3 voices, and was last updated by
2 years ago
October 29, 2021 at 10:09 am Hi. I’m still battling with “what should I do about the dripless?” My gears are so close to the shaft log that only about 2 inches or less on Stb of shaft are showing between the Tides Marine seal flange and the shaft coupler (solid). Which means that the only way to change the seals is to lift the rear of the engine/gear about 8 inches and work under that load to remove the shaft coupling with a puller etc, impossible. Which I…
8 RepliesNovember 4, 2021 at 6:10 am Hi, Im back with more measurements. These are the ones noted as “Pending” in my previous post. Rear of silicone hose on stern tube to rear of shaft coupling: Port 9 Starboard 8 Overall Tides Dripless assembly length: from rear/end of silicone hose at stern tube to front face of seal housing/carrier. Port and Starboard 6 – 3/4 Seal housing/carrier alone length: based on what I could feel under the silicone hose attached. This is…Last Post by:
posted: 2 years ago
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6BTA Air intake heater grid relays and control box removal
This topic has 10 replies, has 3 voices, and was last updated by
September 19, 2021 at 7:04 pm Hi everyone, I have been troubleshooting a no start issue and noticed that under the starter there’s a bunch of connections to relays and a box with a large plug on it. My guess its all related to the Air Heater Grid, which have no idea if it works or not as some cables are loose. Do I need this in the tropics? How do I disconnect all this and eliminate it? Does the “box” and large plug on it control any engine start and run e…
10 RepliesNovember 3, 2021 at 9:15 am J, Exactly what I did. Removed the whole bracket under the starter with the two heater mag switches, the control box and all the wiring related to that and going around the back to the heater grid. Still in the process of pulling the engines for other maintenance but that’s basically it on the heater. The other step related to starter maintenance would be to find a location that is more accessible for the starter mag switch. I would like t…Last 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
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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450 diamond not making WOT RPM intermittently
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago
November 2, 2021 at 8:41 am Hello, nice to be part of the forum. I have a pair of 450 diamonds, the have 1000hrs and Tonyās double filter set up with gauges. Recently purchased the boat and floated her 2500miles from Ohio to key west. When we departed I briefly hit WOT and saw 2625rpm. During the later parts of the trip I noticed intermittent hesitation to get over the hump. It always got there, then ran flawless at 2250rpm making 21knots. More recently the problem is hap…
1 ReplyNovember 2, 2021 at 10:15 am You may be battling with contaminated fuel tanks. Are there vacuum gauges on the filters? What are they reading? Pull the fuel supply hoses ahead of the filters and take a sample, and observe flow rate. If itās slow, blow some air back through the tank (remove the filler cap!) And see if flow improves. Also look at the fuel tank vents for obstructions.Last Post by:
posted: 2 years ago
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hydraulic pump on a cummins qsb
This topic has 11 replies, has 2 voices, and was last updated by
2 years ago June 11, 2021 at 2:34 pm I have a 6.9 qsb with a zF63a gear box. I am looking into installing stabilizers and am looking for suggestions on connecting the pump. It looks like it may need to be shaft driven but have been unable to find information. Ideas? Thanks
11 RepliesNovember 1, 2021 at 6:16 pm Rob, Thanks for posting this pics, common Vicker V-10 seems to fit well on a 6.7 and the ports are accessible.. You saved us all a lot of time. This looks like a standard 6.7 not the SL model, correct? If not sure, post a serial number or get back a few feet and post a pic of the engine side of the engine ( actually better for me) . TonyLast 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 …
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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CTA Blow By
This topic has 5 replies, has 3 voices, and was last updated by
2 years ago
October 17, 2021 at 11:24 am I am under contract to purchase a 2006 Meridian 411 with CTA 8.3 diamonds. Engines have 2400 Hours. Up until one year ago boat was owned by a charter operator who took passengers around San Diego Bay at 8 to 10 knots for 13 years. He said to me he Performed all scheduled maintenance and never āstressedā The engines. He said he probably only Ran at planning speeds about three times he could remember. During the last year the boat was owned by ano…
5 RepliesOctober 30, 2021 at 9:45 am Sounds like a neat trick, I will do it. I also am pulling the Aftercoolers and sending to you for service. Regarding supplements I have always felt the same as you so that’s why I am floundering a bit. The interesting thing about this one is some Aerospace Lab Guys tested the chemistry of the active ingredient which is apparently commonly used in Spacecraft bearings. The results are surprising. Here is the link: /bobistheoilguy.com/forums…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
2 years ago
October 17, 2021 at 4:10 pm 250 Cummins CPL 953 FWJAC Any comments on numbers are appreciated.
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:
posted: 2 years ago
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2011 Cummins QSC 490
This topic has 6 replies, has 4 voices, and was last updated by
2 years ago October 21, 2021 at 5:32 am {content}Recently purchased a new to me Charter/Passenger boat with a QSC 490 4200 hours. Looks to be the original smart craft gauges. Not the same Vessel View 4 I have on my 2018 QSB 5.9 355. On sea trial with 5 people, and full fuel we weāre able to hit 2570, but engine was only showing 92 percent load. Iām in the process now of getting everything ready for when I begin to use the boat starting next April Aftercooler has bubbling on the…
6 RepliesOctober 29, 2021 at 9:33 am Kane, If you look at the Performance report that Tony attached you see that the 490 is rated at 2500 RPM with the gov kicking in somewhere in the 2565 to 2585 range to limit RPM. You can also look at the data plate that is on the engine and it will tell you the rated RPM. You reported 2570 which is spot on. Since you are seeing a load% that is below 100% at 2570 that bodes well for the life of the engine as it pertains to prop loading. Just …Last Post by:
posted: 2 years ago
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6BTA to 6BT wiring loom question
This topic has 3 replies, has 3 voices, and was last updated by
2 years ago October 29, 2021 at 3:32 am Replacing both my 6BTA 330ās with 6BT 210ās (long story), but the new Cummins supplied 6BTās come with an 8 pin engine wiring loom plug and my 20 year old 6BTAās have a 16 pin round plug (with 13 wires) running into the boats main wiring loom. Is there an adapter of some kind that takes it from an 16 pin round to an 8 pin flat plug to suit the new engines ?
3 RepliesOctober 29, 2021 at 7:18 am Separate temp/psi switches are aftermarket, boatbuilder, etc, not Cummins.Last Post by:
posted: 2 years ago
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VDO viewline 150 PSI gauge pegged
This topic has 3 replies, has 2 voices, and was last updated by
2 years ago October 26, 2021 at 2:04 pm Port gauge pegs past 150 psi as soon as I turn on the on switch. I don’t even have to press the start button to start the engine. Removed the sending unit and hooked up a manual gauge and it reads about 40 PSI at idle. Starboard gauge works fine. Swapped wires up top and ….. port gauge now works fine (reading the starboard sending unit) and starboard gauge pegs (reading the port sending unit). Assumed this meant both gauges were fine…
3 RepliesOctober 28, 2021 at 1:05 pm Your engine block is a common ground, or at least it should be. Plenty of factory wiring diagrams on this web siteLast Post by:
posted: 2 years ago
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Cummins 6bt 5.9 exhaust riser to turbocharger connection
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago
October 25, 2021 at 12:18 pm Have a new riser/ water mixer being made. Should the connection be dry or a a mastic used. Should the cap screws be replaced with studs (the screws were rusted to the point of no usable head left).
2 RepliesOctober 26, 2021 at 3:42 pm PO used jb weld on riser. Survey missed because blanket covered. All mechanics busy w/ existing customers. Thnks for your help.Last Post by:
posted: 2 years ago
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Two thruhulls in single rectangular hull strainer?
This topic has 9 replies, has 4 voices, and was last updated by
October 15, 2021 at 10:27 am Hi everyone, While looking for simplification options and thruhull relocations I have thought about the following: Can I mount two thruhulls within a single rectangular hull strainer given the mushrooms outside fit and the valves inside fit? 1st hull strainer with: 2″ port engine raw water intake thruhull and 3/4″ A/C raw water intake thruhull 2nd hull strainer with: 2″ starboard engine raw water intake thruhull and 3/4″ …
9 RepliesOctober 26, 2021 at 1:37 pm Thank you TonyLast Post by:
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Engine wonāt crank after losing fuel shut off solenoid
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago October 24, 2021 at 6:21 am After running a few hours yesterday we stopped at our destination and started to smell something burning. Opened the engine hatch and found smoke coming from the solenoid. Went to shut off the key but motor Stayed running so I lifted the lever on the solenoid to shut it down. Now the motor wonāt do anything at all, wonāt crank just completely dead. The motor is a 6bta 5.9 315 hp. Thanks for the help and figured I would ask first before I start r…
1 ReplyOctober 25, 2021 at 12:17 pm Really not something that can be “solved” over a forum. You need to do investigate all with a multimeter starting at the engine battery and working your way back to the engine and ignition/start circuit. Keep us posted…Last Post by:
posted: 2 years ago
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6BTA Raw Water Pump Inlet Elbow Issue
This topic has 2 replies, has 2 voices, and was last updated by
October 22, 2021 at 10:04 am Hi, Im trying to find solutions to not re-route the raw water hose under the engine pan-against the stringer into the inlet elbow of the raw water pump. My 6BTAs have the standard Sherwood 1730 pump and the stringer is so close to the inlet that the hose is basically unreachable unless the engine is lifted. Since I am getting ready to take the engines out for maintenance, might as well do something about the hose connection. Thought about adding…
2 RepliesOctober 25, 2021 at 10:55 am I agree with changing the pump when the engine is out if it needs to be. In regards to the elbow swap, I thought of curving it up and over the stringer, not only away from the stringer. If I rotate it by loosening the plate I could probably separate it from the stringer but it would still be running the hose under the engine and very hard to reach the hose clamps etc.Last Post by:
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Winterize QSB6.7
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago October 20, 2021 at 12:49 pm I have a new to me boat with 2015 Cummins QSB6.7 engines. How many gallons of antifreeze to get all the way out the exhaust? Thanks
1 ReplyOctober 25, 2021 at 6:37 am I have a 5.9 QSB, I run about 5 gallons thru. I suspect youāll need at least that. Basically youāll want a dark pink coming out of the exhaust and your dripless as well – if you have dripless. Best advice, run extra thru – $6 or $7 a gallon is cheap insurance against freezing.Last Post by:
posted: 2 years ago
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6BTA 330 sudden shutdown at 2100rpm
This topic has 3 replies, has 3 voices, and was last updated by
2 years ago October 18, 2021 at 5:36 pm 6BTA 330 (M3) 2000 model 857 hours in Riviera 3350 FB. Travelling along nicely at 2100rpm, temp good at 78 degrees, oil pressure good at around 50psi, port engine suddenly loses power and stops. Felt the boat starting to lose power so had already began to throttle back, looked at the port tach and she’s dead. Engine would not restart, cranks but wont even attempt to start. Limped back to port on one engine. Tech has now changed the Ra…
3 RepliesOctober 24, 2021 at 9:09 am Bummer on the cracked valve, but now you know what needs to be fixed – hopefully back underway after quick repair.Last Post by:
posted: 2 years ago
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Bleeding 6BTA
This topic has 10 replies, has 6 voices, and was last updated by
2 years ago October 20, 2021 at 12:06 am I recently changed the fuel cooler fuel lines and separator and engine fuel filters on my Cummins 6BTA 5.9 (330hp). On my old Yanmar, all I had to do after this kind of work was activate the lift pump on the filter assembly and keep pumping until the pump went hard to ensure the system was bled properly. I tried this using the lift pump built in to the fuel system adjacent to the fuel pump on the Cummins 6BTA, but after a couple hundred strokes …
10 RepliesOctober 21, 2021 at 5:47 pm Might see or hear you out there mate. We usually fish the ‘shelf off Cape Moreton. Can’t wait to get stuck into them and hopefully get a run at Fraser this year too! All the best, BenLast Post by:
posted: 2 years ago
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Blowby test results 14 H20 Excessive? (12 Worn)
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago
October 20, 2021 at 11:57 am Recently sea trialed a 2006 44 Sea Ray Sundancer with QSC 8.3 500ās with 1000 hours. The results for the blow by were 11.3 and 14.2. We do not know the maintenance history on the engines and know that the heat exchanges, aftercoolers & valve adjustments need to be serviced ā this has not been done at least in the last 3 years and 300 hours. The oil samples came back good but not a lot of history. There was no noticeable smoke coming from the…
2 RepliesOctober 21, 2021 at 9:21 am Dave, Thanks so much as this is very helpful and reassuring! They did use the correct .302 orifice according to the Cummins specs. HeatherLast Post by:
posted: 2 years ago
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Draining Coolant from my QSB 5.9 engine
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago October 18, 2021 at 1:36 pm Thanks for letting me ask this question…I have a Cummins QSB 5.9 and I am in the process of winterizing this engine. I emptied the raw water from the main cooler on the port side and emptied the exhaust silencer before adding the Antifreeze. Started up the engine and sucked the Antifreeze in until I saw the red coming out the silencer so I’m sure this is done properly. Because this is a new boat and I am not a pro winterizer, I…
1 ReplyOctober 19, 2021 at 6:55 am Yup, coolant check/change should have been done before decommissioning the boat. Only way I see it at this point is to remove the tstat from the housing and flush the higher protection coolant through from top down.Last Post by:
posted: 2 years ago
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Prop shaft seal options for super tight space?
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