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- Cummins Marine Forum Topics
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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
2 years ago
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:
posted: 2 years ago
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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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6BTA Aftercooler caps, Paint or No Paint?
This topic has 4 replies, has 3 voices, and was last updated by
October 16, 2021 at 11:55 am Hi, I’m in the process of servicing and refreshing the aftercoolers and need to know if it is necessary to paint the bronze? caps. For some reason three of the caps had been painted and looked fine except for being dirty and needing a new coat of paint. The fourth cap was not painted (probably recently replaced) and had light green oxidation (fuss) over it. A quick scrub with a wire brush took it off and it looks like new. So the question …
4 RepliesOctober 17, 2021 at 6:11 pm Thanks Rob, I’m planning on adding fresh water flushing, in which case I will set my PM schedule for two years. Same for heat exchangers. I’ll gauge this starting when I’m back in service early 2022. Too much on the list before I get to crank my engines again.Last Post by:
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Engine shut down
This topic has 5 replies, has 3 voices, and was last updated by
2 years ago
October 15, 2021 at 2:45 pm So I’m getting ready to pull the boat for the year and I went out for one last run to get my wot numbers. On my formula 41pc with 6cta 8.3 450 diamonds my throttle clicks every advance. So click by click I move up in rpm . I get to 2570 and my motor instantly turns off. No power at ignition. I pull into a slip and I popped a 10 amp fuse in the motor harness in the bilge. The wire was orange. Y would this Happen. I replaced with anothe…
5 RepliesOctober 17, 2021 at 4:31 pm It is the inside that counts. That does not look like paint in the socket. GeneLast Post by:
posted: 2 years ago
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Oil change ????
This topic has 3 replies, has 2 voices, and was last updated by
2 years ago October 11, 2021 at 6:46 am Hello forum members, As Tony always says….paraphrasing “no need to throw out good oil” I have a new ReCon QSB 5.9 480 in my lobster boat. Great engine ! Jan 2020 Engine was filled with oil/anti freeze at the dealer for a “quick fire” before I moved the engine to the shop for installation. Engine was not run between Jan 2020 and Sept 2021 as I completed the repower/rebuild. Boat was launched Sept 2021 and I;ve been …
3 RepliesOctober 17, 2021 at 6:22 am Thanks Rob, I haven’t changed the oil. Hate to throw out good oil šLast Post by:
posted: 2 years ago
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CTA 450 cylinder head torque
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago October 9, 2021 at 3:39 am Hi, I have blown the head gasket on my 450 and am about to dive into removing the head, etc. I found the link under Tony’s tips for the head torque procedure and it lists the values for 26 bolts. The diagram shows 32 bolts. What is the procedure/torque values for the remaining 6 bolts? Thanks, Cam
2 RepliesOctober 16, 2021 at 2:39 pm Per my best mechanic that does this stuff quite often————-This is Accurate for the “C” 8.3 –26 bolts.. 12 x 80MM and 14 x 160 mm long————-Obviously my web site in wrong & I need to change it..Last Post by:
posted: 2 years ago
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Over propped – reduce pitch by 1 = +250 RPM?
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This topic has 31 replies, has 7 voices, and was last updated by
2 years ago
August 24, 2021 at 11:44 am I have a pair of 2001, 6BTA 330s, CPL 1975 When purchased, the boat hit 2800 RPM with full tank and 2 buddies on board. Would have preferred 2900, but had other issues to focus on. Stamp on prop said 20×22. Dinged a prop and took both in the be dynamically tuned and added a partial cup (probably not a good idea, given what I have learned since). Now boat can’t get past 2650 RPM They worked off of what was stamped on them, but now I&…
October 15, 2021 at 2:03 pm It might be all in my head but she even seemed to handle better at higher speeds. I did not have to mess with the trim tabs as much. Just filled her up with fuel. will get a couple of buddies on board. Might put the laser tach on the shaft and get the ratio first and then take her up and make the calculation from there as it is far more accessible. If at 2900, I might leave it alone. or I might fill up the water tanks (they are usually only abou…
31 Replies
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posted: 2 years ago
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Starting and breaker panel
This topic has 2 replies, has 2 voices, and was last updated by
September 29, 2021 at 9:58 am Inside my salon I have a panel of circuit breakers. Among them are two that say “Port Engine” and “Starboard Engine”. Ever since I bought the boat, if I wanted to start the Port engine, that port breaker would have to be on. Then I would need to go up top and the port start on/off rocker switch would have to be switched on (there is no key). Then immediately an alarm would sound. After that, I would push the start button …
2 RepliesOctober 15, 2021 at 1:51 pm Yes each can start and run independently. There are separate thick red positive wires going to the flybridge and straight to my port and starboard on/off switch. The bridge breaker can be off and both can run. The Cabin breakers can be off and both can run. However if everything is off, including the port engine breaker, the the port engine will not start, as expected. flip that breaker and the port starts right up. But if everything is off, in…Last Post by:
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CTA Blow By
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