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- Cummins Marine Forum Topics
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What is this additional plug for?
This topic has 3 replies, has 2 voices, and was last updated by
1 year ago April 24, 2023 at 1:55 pm Received an aftermarket same as OEM starter from SB Mar and there is an additional plug not on my original starter. 2004 6cta 8.3 480CE. Picture below.Ā Bottom at rear of starter, black around 7 o’clock. Thanks
3 RepliesMay 5, 2023 at 12:36 pm If you are talking about the plastic plus beneath the Main POS connection, ignore it. It’s a thingee for a smart start feature in on-highway applicationsLast Post by:
posted: 1 year ago
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Throttle flat spot
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago May 2, 2023 at 4:46 pm My QSC 8.3 has developed a intermitant flat spot when rolling power on.Ā Suddenly rpm stops climbing. Advancing throttel further has no effect and suddenly an explosive rush of power. Happened three times in 600nm trip. Engine has 1320 hours , uses no oil and tempatures all in range. Boost pressure however varies up to 10# at constant RPM. No obvious boost leaks but suspect condensation drain might be stuck open. Could it effect boost pressure b…
1 ReplyMay 4, 2023 at 8:43 pm A bad condensation drain could do that if indeed you are getting a 10PSI drop from the leak — Cap it for a few trips and see if that solves the issue–Remember pressures in there can beĀ 20PSI ++Last Post by:
posted: 1 year ago
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6BTA Oil Pan Leak
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago May 2, 2023 at 8:23 am Hello Forum, I recently discovered oil under my engine.Ā I noticed it after a 5 hours of running across 2 days. (none there previously – as I was inspecting engine prior to trip).Ā I believe it is coming from the pan connection. My best guess is that it leaks a tablespoon over an hour (maybe less). Questions: Does anyone think it is not the pan interface after seeing my photos? Is it safe to retorque the bolts to spec (I believe the spec …
1 ReplyMay 4, 2023 at 8:03 pm If it was me, I’d pull each bolt one at a time remove what ever oil you can (make the bolt dry) coat the thread and the shoulder with Rectorseal #5 and tighten to spec — chart attached–On bolt this size, IMO and good “feel” is better that a measure bolt torque.Last Post by:
posted: 1 year ago
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MDL4 gene fuel filter swap
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago May 1, 2023 at 6:23 pm Hello Everyone, I finally gave up on the mechanical transfer pump, II just cant get it to stop leaking. I decided to go with an electric seachoice 4-7 psi fuel pump. While changing it I decided maybe it would be worth changing out the rectangle fuel filter for a regular spin on. Any reason why not to do this? thanks , Paul
1 ReplyMay 4, 2023 at 7:29 pm If you can do it practically /100% reliableĀ and it makes maintenance easier, then go for it.Ā Use something less that 10 Mic if this is a “last chance” fuel filter.Last Post by:
posted: 1 year ago
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Bubbles in coolant in coolant
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago April 28, 2023 at 12:05 am I have had small bubbles in my coolant expansion tank for the past month this past week they have gotten so bad it is now displacing a significant amount of coolant about a full expansion tanks worth. I have done a coolant compression test and. Coolant compression gas test both indicated that I do not have leaks in the head or combustion gasses in my coolant. Radiator cap is brand new, all heat exchangers were serviced within 200 hours and turbo…
1 ReplyMay 4, 2023 at 7:26 pm What EXACT model engine do you have?Last Post by:
posted: 1 year ago
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power to kill
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago April 11, 2023 at 11:47 pm 6bta 5.9Ā 970 CPL is there a cummins system that used a powerto kill the engine if so there can I find a diagram
1 ReplyMay 4, 2023 at 6:57 pm All you have to do is LEARN how the lever works that the externalĀ solenoid operates.Ā Basically you have an “true diesel” that needs NO power to run, only to start.. Your solenoid defeats that.Ā Learn how it works and then be cleverĀ using “mechanics 101Ā — There is no kit or diagram..Ā Ā The solenoid you are dealing with should be similar to the pics attachedĀ but will not be easy to deal with.. It’s kinda buried.Last Post by:
posted: 1 year ago
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DJ Pumps 1730C Pump – Issues
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago April 2, 2023 at 3:24 am Hi Guys While I have the aftercooler and HX etc off the engine its far easier to pull the impeller (its actually the only way on the port engine being so crammed in cose to the fuel tanks) On pulling the impeller out a chrome ‘cup’ and spring came out.Ā Now I understand that the DJ pumps pump is similar to the SBmar pump however i have no doubt that it has some Tony tweaks to it.Ā Looking at the exploded diagram of the pump I found o…
1 ReplyMay 4, 2023 at 6:42 pm It’s been a month or so.. How is your DJ pump doing?Ā When you expect to see 1000 hours of use?Last Post by:
posted: 1 year ago
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QSM11 Dry to Wet Exhaust Replacement
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago March 29, 2023 at 6:01 pm I’m considering purchasing a boat with QSM11 engines that have already had both turbos replaced due to the heat issues discussed at length in this forum. I see that members have discussed the Wet Exhaust manifold mod that apparently Cummins produced as a modification to these engines to better resolve the excess heat problem (after you’ve ensured the engines are not over-propped) and resultant cracking.Ā But I can’t find any di…
1 ReplyMay 4, 2023 at 6:38 pm Converting from Dry to wet is not really practical……… You’d be better of propping downĀ to keep you GPH at 2000 RPM under 20 GPH cruise load as you use the boat and maintain the aftercooler in pristine condition.Last Post by:
posted: 1 year ago
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Envirovent ccv kit install issue 6cta
This topic has 3 replies, has 2 voices, and was last updated by
1 year ago May 2, 2023 at 4:04 pm Have a 1997 Cummings 6cta 450 diamond series. I recently purchased a enviro vent kit. Reading the directions it says to tap off valve cover. Looking at my motor it looks like the crankcase breather tube comes off the block and goes to a filter before running through a dump hose to the bilge. Can someone please clarify if you remove the factory crankcase filter or connect the Envirovent hose direct to it. Pics are attached to help paint a picture…
3 RepliesMay 4, 2023 at 6:28 pm You have a very late build 6CTA 8.3 CPL 1929 450 (rated 430BHP 2600 RPM–same as a later “450 Diamond) ).. I was not even aware that the engine was still being made.. Very good engine but technically itĀ is not a “450 Diamond” as it’s a M2 using the Nippon Denso EP9 injection pump system.Ā Ā Like all the earlier C’s, prop them to reach a solid 2700+ RPM and reach it easy when fully loaded.Ā Notice the actual ser…Last Post by:
posted: 1 year ago
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QSC500 grid heater
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago May 4, 2023 at 7:58 am New issue with my Cummins diesels – puff of white smoke at startup only – port engine last year, now both engines this year.Ā Cool spring climate (48-degree water temp) in the Great Lakes region, QSC500’s with 1200 hours, 44DA 2006.Ā Engines run great otherwise, and very little white smoke at startup in summer.Ā Unable to locate grid heater to test.Ā Provided s/n to Cummins factory and local svs but unable to help, factory unab…
1 ReplyMay 4, 2023 at 8:52 am I would just use the Wolverines.Ā You get quite a few additional benefits with them.Ā Warmer, drier engine compartment…..Ā Warmer oil at start up… Here is a Tony’s Tips article that gives you some pointers on where to look on your QSC for the grid connections. Boost Fitting Locations for B & C Series Marine DieselsLast Post by:
posted: 1 year ago
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Fuel Pressure 2014 Qsb 5.9 480hp
This topic has 8 replies, has 2 voices, and was last updated by
1 year ago
August 29, 2022 at 11:12 am Hello, I have twin QSB 5.9LĀ 480hp Im getting a low fuel pressure code on my Console. I have changed the lift pump, both fuel filters one on engine and the racor. Lift pump also have been relocated off the engine. Is there a additional pump and screen? Thanks, Caw Today Im installing a fuel pressure gauge.
8 RepliesMay 2, 2023 at 2:20 pm After back tracking and tracing 12v vs 24v lift pumps. Found out my engines require the 24v pumps, not the 12v pumps that superceded the origanl pumps.Ā Was able to find 2 at Cummins and installed them ,Problem Solved!Last Post by:
posted: 1 year ago
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Stbd. Engine Running Rich?
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago May 2, 2023 at 3:27 am I’ve installed new fuel filters and new air filters. Ā I’ve cleaned the compressor wheels and cleaned up the aftercoolers (as per Seaboard Marine kit). When she’s running, the Starboard side runs rich compared to the port side. Ā The starboard is original to the boat at 1994 with 570 hours, the port is a 2017 with about the same number of hours (on the hour meters at least). Ā Since I am unfamiliar with how much these engines shou…
1 ReplyMay 2, 2023 at 4:52 am What engines?Ā Mechanical 6BTA’s? That would be normal at startup if they have not been taken out and put under load and brought up to normal running temps, especially if you’re pumping up the rpm’s at the dock.Last Post by:
posted: 1 year ago
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sbmar o ring kits
This topic has 3 replies, has 2 voices, and was last updated by
1 year ago
April 30, 2023 at 10:00 pm Hi I hope as a newbie I get one dumb question if so this is it i ordered the o ring kit for a cummins 6bta 5.9 with the old tube after coooler why have I got 2 sets of O rings and which ones do I use Fat or thin thanks Brendon
3 RepliesMay 1, 2023 at 2:08 pm Hi John It just came thru was exactly what I needed thanks for your help regards BrendonLast Post by:
posted: 1 year ago
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Cummins QSC 8.3 runs rough at idle speed in gear, clears above idle.
This topic has 10 replies, has 6 voices, and was last updated by
1 year ago September 1, 2022 at 12:23 pm My 2014 Back Cove 37 single QSC 8.3-600 HO with 458 hours runs very rough when in gear at idle speed, enough to cause the boat interior to shake. Ā Advancing the throttle slightly stops the problem. Here are some particulars: When started (ZF 286A 0.91 gear not engaged), the engine idles smoothly @600 rpm. Ā Varying engine speed while in Warm Mode is also smooth with no sign of rough operation. Ā When the ZF is engaged, the engine speed remains st…
10 RepliesApril 30, 2023 at 6:04 pm Linear vibration (when your instruments hanging from the ceiling vibrate ,your boat rails move,Ā or you “feel it” on the back deck or in the seat of your pants) is totally different from “gear rattle” which can be very annoying sound wise. Gear rattle is typically related to a worn out torsional coupling or mis-match at lower /idle RPM’s and goes typically away when the RPM is raised a tad,.Ā I guess some boats coul…Last Post by:
posted: 1 year ago
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Alternator tension adjuster
This topic has 4 replies, has 3 voices, and was last updated by
1 year ago April 27, 2023 at 8:56 pm Which direction does the alternator tension adjuster bolt loosen? Is it left or right to loosen it? Or is there some other trick to loosen the alternator to get the belt off?I even used a 15″ breaker bar after spraying with PB Blaster penetrant. This is on a Back Cove 34 with a Cummings QSB 6.7.
4 RepliesApril 30, 2023 at 5:11 pm Besides the tension bolt, loosen to lower pivot bolt so you can push on the alternator to loosen the belt.. The system seems to work, but I have my doubts as to the overall engineering behind it…….. It has room for error. Ā BTW, the actually belt used here is made by Hutchison Aerospace in the UK — It is one of the stretchy series and we call it our silver belt ————-Ā 8PK1474Ā stretchyĀ Ā Ā Ā You should s…Last Post by:
posted: 1 year ago
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Found this under my QSC 8.3
This topic has 4 replies, has 2 voices, and was last updated by
1 year ago
April 30, 2023 at 10:09 am I found this bolt under my QSC 8.3. I guess it must have vibrated out. Ā What is it? Ā Should I just screw it back in? Ā Use Loctite? Ā
4 RepliesApril 30, 2023 at 12:57 pm Thanks, looks like something I will have to check regularly in case it come out again.Last Post by:
posted: 1 year ago
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QSM11 engine light module availability
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago April 25, 2023 at 11:29 am Good afternoon, Iām curious if I can still get my hand in these older QSM11 engine alarm light modules are still available? Ā Iām in the process of refurbishing an old Hatteras that has them but the old ones look like hell and would like them to be fresh and new. Ā I believe they are the old C style gauges. Ā Any help is appreciated. Ā
1 ReplyApril 30, 2023 at 12:32 pm Everything we have is here: https://www.sbmar.com/product-category/instrumentation/qsm11-instrumentation/Last Post by:
posted: 1 year ago
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Raw water pump not pumping.
This topic has 6 replies, has 4 voices, and was last updated by
1 year ago April 27, 2023 at 3:15 pm I just replaced the impeller and put it back together and no water is coming out the exhaust. Iāve taken the cover off to make sure the impeller is spinning. Iāve tried pouring water down the hose after the pump. Not sure how to prime pump if I need to?
6 RepliesApril 29, 2023 at 6:24 am Good points about the new vs. old impeller priming and that restrictions that may be downstream having an effect…Last Post by:
posted: 1 year ago
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Cummins ETS control valve change
This topic has 3 replies, has 2 voices, and was last updated by
1 year ago
April 21, 2023 at 10:55 pm HI After some advice. recently had a problem with the starboard engine gear shift, turned out to be a a faulty solenoid valve replaced both valves that came with new standard din plug connectors , As the old led connectors had disintegrated we replaced them also. We now cant get a signal to the valve to work , valve Ā works fine when connected to port engine and original din connectors. looks to be more to the original din connectors than just l…
3 RepliesApril 28, 2023 at 8:52 pm Hi TonyĀ thanks for the tip , we look to have no voltage output to the starboard solenoidsĀ Port side and everything else working fine is there something inside the ETS that may of blow a fuse or trip ??Ā our ETS model is 4929690Ā thanks for your helpĀ OwenĀLast Post by:
posted: 1 year ago
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Best plan of action post sinking?
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago April 27, 2023 at 3:28 pm I’m back on here looking for some advice.Ā <br /><br />I last posted about my boat back in October 2019 looking for advice on rebuilding my 6BTAs. They were not in great condition but would still start up and run for a short time. Unfortunately, the pandemic hit and the mechanic I had lined up passed away in the middle of all of it before starting the project. In the mean time, I got a job overseas for 2 years and left my boat w…
1 ReplyApril 28, 2023 at 5:17 am Until you have the time to pull the head on the “suspect engine” and assess rust damage, you need to protect the engine as best you can with lots of #2 in the cylinders.Ā As to the engine that is running, fresh oil and a start up every week or so using fresh water on the seawater side.. If the engines have milky oil, you need to address that. Pull the valve covers and look for water /rust?Last Post by:
posted: 1 year ago
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What is this additional plug for?
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