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- Cummins Marine Forum Topics
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Aftercooler condensation drain install?
This topic has 5 replies, has 3 voices, and was last updated by
7 months ago September 21, 2023 at 10:19 pm Hello i have a 450 6cta with the older style aftercooler that has no kind of condensation drain on it, and living in the great humid state of florida it likes to build up the condensation in the aftercooler. I was thinking about adding a drain of sort and was reading around and was wondering if just drilling a small weep hole like 1/16ā low on the housing would work for this similar to what Tony said the older Detroits had on their set ups? Or i…
5 RepliesSeptember 23, 2023 at 2:06 pm Go fishing and continue your current program–you are head &Ā shoulders above the majority of most All is good.Last Post by:
posted: 7 months ago
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Fuel burn says Iām over loading the motors..
This topic has 15 replies, has 6 voices, and was last updated by
7 months ago
February 28, 2021 at 8:41 am CAT 3126 420 HP 2800 WOT. Purchased new 3 blade ACME props 2 seasons ago and it made a big performance difference and the boat is running great. But… hereās the rest of the story. Finally got fuel flow info. RPM CAT spec. GPH My burn 2850. 23.0 23.1 2500. 15.0 15.5 2400. 13.2. …
15 RepliesSeptember 21, 2023 at 6:18 am The standard power requirement curve says that the power (and fuel burn) needed is directly related to the RPM raised to some exponential factor. Cummins uses 2.7 for the exponential factor. I analyzed the Cat specs in your first post, and it is clear in that case the exponential factor is 3.0. So, yes, the factory specs are different. The Cat spec is a bit more restrictive at mid-range RPMs. However, that is irrelevant for either Cummins or Cat…Last Post by:
posted: 7 months ago
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QSM 11 Mysterious shutdowns
This topic has 12 replies, has 5 voices, and was last updated by
7 months ago
February 8, 2018 at 1:19 pm I have a pair of QSM 11s in a 2008, 50′ Altima trawler. I have owned the boat for 3 months and recently the starboard engine will shut down for no obvious reason. I am in south Florida with mild temps. The engine runs perfectly and suddenly turns off ( usually after operating for 30 minutes to an hour) as if I had pressed the shutdown switch and turned off the ignition. When this occurs the ignition to the starboard engine is dead i.e. no…
12 RepliesSeptember 19, 2023 at 8:44 am This thread was a lifesaver for me as my Maritimo with QSM11’s exhibited similar problems.Ā The engine would shutdown, the Smartcraft screen would go blank, and the engine would only restart after a rest period of thirty minutes or so.Ā The final shutdown occurred shortly after I cranked the boat, but I was still tied to the dock so I could do some trouble shooting.Ā Ā Thanks to this thread, I had a Power Probe set up in the engine room.Ā …Last Post by:
posted: 7 months ago
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SMX purple mounts for Volvo??
This topic has 1 reply, has 2 voices, and was last updated by
7 months ago September 13, 2023 at 2:41 pm I’ve has some Cummins 3349230 mounts on my Volvo TAMD 61a for 5 years now and I think it’s time to replace them. They appreat to be twisted in the aft set and the rubber is looking bad. I see that the SMX purple 70 or 75 Durometer mounts are a good replacement BUT which is best? Do I need to get the 70 or 75’s? I assume the 70 Durometer are softer but what’s the difference between the 70’s and 75’s?Ā Thanks in…
1 ReplySeptember 18, 2023 at 6:31 pm 75’s would be best………….Ā Hopefully you can control the saltwater spray in the futureLast Post by:
posted: 7 months ago
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FW flush… Doomed to fail exhaust? 5.9 QSB
This topic has 4 replies, has 4 voices, and was last updated by
7 months ago September 3, 2023 at 7:22 am See attached pictures.Ā Is my exhaust doomed to fail?Ā I’d like to install the freshwater flush, ideally AFTER the water pump so I can flush with engine off.Ā Think I’m ok?
4 RepliesSeptember 10, 2023 at 4:05 pm Your exhaust looks well designed. Tony’s crew built the custom exhaust for my QSB 5.9 480 lobster boat install. All from 3,000 or so miles away !Ā 17″Ā above the static water line gravity drain at dockĀ ĀLast Post by:
posted: 7 months ago
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Update on faults / issues QSB 5.9 CMDs Zeus pods
This topic has 1 reply, has 2 voices, and was last updated by
7 months ago September 6, 2023 at 1:05 am I was just glancing through topics posted by me and thought may be helpful to update. CCM joystick fault – UK based – told no possibility of repair – so replaced with new. Kept old one in belief these things can surely be repaired as cannot be that complex – hard for something to go catastrophically wrong when its sat at inside helm bone dry. However Mercury did say no repair service available. Expensive – think cir…
1 ReplySeptember 7, 2023 at 6:35 am Nick, Lots of good input here as you are obviously a self-taught ZEUS tech.Ā I personally have close to ZERO hands- on experience the system, just reading thru tech manuals, etc.Ā Too bad the system is so complex and real support was never very good –My guess is that it is getting worse as time goes by.. You are in a good position to helping others and if you want, send me a direct email and I will forwardĀ you contact leadsĀ with “p…Last Post by:
posted: 7 months ago
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Barry controls engine mounts
This topic has 1 reply, has 2 voices, and was last updated by
8 months ago August 21, 2023 at 8:28 am Hello can anyone rate my barry controls motor mounts. are these broken? is bothered by vibrations. Ā best regardsĀ Arve Larssen
1 ReplyAugust 22, 2023 at 5:03 pm This particular mount design by Barry has hadĀ issues since released.Ā IMO they are “junk” and in your case, at least two have totally collapsed.Ā Iron castings should never be used in a application like this. Total couch engineering was involvedĀ here… The isolator mount that would and should replace them isĀ the Barry 27655-2Ā orĀ CumminsĀ 3349230Ā that we market as our “SMX Purple 75” mount.Last Post by:
posted: 8 months ago
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Breather tube leaking oil, no smoke,
This topic has 3 replies, has 3 voices, and was last updated by
8 months ago August 20, 2023 at 5:55 am 05 6bta 330hp. Engine is leaking oil out of breather tube, top of dipstick, last two valve cover gaskets. even some bolts on oil pan. About a quart every 5 hrs at cruising. There is little to no smoke coming out of breather tube. Engine runs perfect, no issues with performance. Change oil and stays very clean for a while, 20hrs or so before turning normal black. Guessing I am getting a lot of pressure in the engine. Donāt understand why thereās …
3 RepliesAugust 21, 2023 at 4:59 pm These are 40Kb thumbnail pics– Can see nothing of valueLast Post by:
posted: 8 months ago
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SMX Exhaust Thermal Alarm on a 1 9/16″ Centek fiberglass elbow?
This topic has 1 reply, has 2 voices, and was last updated by
8 months ago August 17, 2023 at 4:26 pm How do I achieve an adequately wide marriage between the sensor and the 40mm fiberglass tube?
1 ReplyAugust 18, 2023 at 10:24 am Post some pictures of your engine exhaust including dry riser to wet elbow and a pic of where you are referring to adding the switch.Last Post by:
posted: 8 months ago
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Stuffing Box getting hot
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This topic has 22 replies, has 7 voices, and was last updated by
8 months ago
July 28, 2023 at 9:11 am I recently had a major failure of my dripless so I had my local marina install a traditional stuffing box. I havenāt been able to run the boat above idle because the stuffing box is getting quite hot (canāt hold my fingers on it for more than a few seconds) even though there is plenty of water dripping. Brought it back to the yard and theyāre telling me it needs an alignmentā¦. obviously the alignment shouldāve been looked at before finishing the…
August 15, 2023 at 6:25 pm You could drill and tap the fiberglass tube behind the gland to accept a water feed fitting. Id recommend to remove the unknown packing and reinstall with a high quality product according to Tonyās Tips instructions. Polishing up the shaft where it goes through the packing might help too.
22 Replies
Last Post by:
posted: 8 months ago
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Bilge Blowers
This topic has 2 replies, has 2 voices, and was last updated by
8 months ago August 14, 2023 at 7:14 am Recently while speaking to a Cummins engine tech we got on the topic of blowers for diesel boats.Ā He said he recommends to all his customers to turn the blowers around and blow air into the bilge rather than exhaust.Ā His reasoning was that there is no need to exhaust gasses/fumes from diesel, so you want to provide the max amount of air into the bilge for the engine.Ā Is this sound logic/a good recommendation? 2000 Cummins 8.0 6CTAs For…
2 RepliesAugust 14, 2023 at 11:48 am Whether you are drawing hot air out with the blower in the original configuration or turning the flow around and drawing cooler air in, I would guess it is even up.Ā When you draw hot air out, cool air is drawn in to replace what is being drawn out.Ā If you turn the flow around you draw cool air in and then the existing hotter air will exit the compartment in various ways. I have not done an experiment but I would guess it to be close to even up…Last Post by:
posted: 8 months ago
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Onan Code 36 troubleshooting
This topic has 3 replies, has 3 voices, and was last updated by
8 months ago
July 18, 2023 at 10:49 am I have aĀ 13.5 kw Onan, model MDKBN ā 16100114 generator with 1280 hrs in a mikelson 50.Ā Boat is a 2018.Ā Purchased from original owner last year.Ā I continue to have intermittent shut down issues with the generator.Ā In most situations it shuts down after multiple hours of run time.Ā Experienced shut downs first at 4 hours and as long as 7.5 hours.Ā Code is always “36”.Ā Ā Tested in multiple ways.Ā Low demand, medium demand and high …
3 RepliesAugust 13, 2023 at 4:07 pm Do your best to describe what the shut down sounds and appears like. Does the engine shut down abruptly or fast with little or no bumbling. A fast shutdown with little or no stumbling is likely electrical. Check electrical connections from and back to the battery.Ā Don’t just look at them.Ā Ā Ā Use a DMM to help locate high resistance connections as they can heat up creating even more resistance, enough to cause a shut down A bumbling, or c…Last Post by:
posted: 8 months ago
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Please critique my freshwater flush setup!
This topic has 4 replies, has 3 voices, and was last updated by
9 months ago January 21, 2023 at 12:23 pm Hi Everyone. Just got my freshwater flush set up complete. It’s a little different from a lot of them I’ve seen on the SBMAR, so please, critique. Here’s the details: Because of my exhaust, the engines have to be on, and because I’m on a mooring, or at anchor, I don’t have access to a hose/dock water consistently, but I do have a water maker and a 150 gallon freshwater tank.Ā The setup is designed to pull water fro…
4 RepliesJuly 24, 2023 at 6:33 am Very nice work and a engine room that shows some serious passion..Ā GREAT WORK! If I was to question anything it would beĀ to add a simplier wayĀ to swaps sidesĀ ?–Can’t really tell how is comes apart unless the big bronzeĀ hex is a UNION?Ā Ā 7-10 gallons should be more that enoughLast Post by:
posted: 9 months ago
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SMX Redundant temp alarm dull sound and flickering light 6BTA
This topic has 7 replies, has 3 voices, and was last updated by
9 months ago July 16, 2021 at 4:29 pm Hello I installed the SMX alarm panel with gear pressure sensor, raw water exhaust sensor, oil pressure sensor, and engine temp sensor recently on my 37 Nordic Tug. Since install I have had an issue with the temp sensor very faintly flickering the light on the panel, which you can barely notice, and making a dull sound out of the alarm but not fully activating it. This starts occurring around 1600 rpm and above. I switched the sensor wires on…
7 RepliesJuly 24, 2023 at 6:06 am Thanks for the follow-up LeeLast Post by:
posted: 9 months ago
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6cta 8.3 Idle Adjustment
This topic has 2 replies, has 2 voices, and was last updated by
9 months ago July 17, 2023 at 8:36 am Hope everyone is having a great summer. I have 97 Carver 500 with pair of 6ctaās and the port engine is idling 150-170 above the starboard.Ā starboard at start up with run between 610-630rpm but the port is idling 715-740 which is making a hard shift for the trans.Ā when I turn the synchronization on it will idle down since the port is in āslaveā and the starboard is actually running them both.Ā is there an adjustment on the engine? Ā Ā
2 RepliesJuly 18, 2023 at 4:50 am I will check that first thing.ĀLast Post by:
posted: 9 months ago
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Fresh water Flush – water lift muffler
This topic has 3 replies, has 2 voices, and was last updated by
9 months ago July 10, 2023 at 5:11 pm Hey all, I know this topic has been beat to death but I just want to make sure I have it right. Ā My boat has a generator with a water lift muffler and itās rigged with the sbmar fresh water flush valve on top of the strainer. Ā If I leave the seacock open and connect my dock water hose and use that method to flush it, it wonāt cause any issues because any over pressurization would go out of the open seacock, correct?
3 RepliesJuly 14, 2023 at 11:23 am Glad to help.Ā Nice boat J !Last Post by:
posted: 9 months ago
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VDO gauge indicates high temperature
This topic has 2 replies, has 2 voices, and was last updated by
9 months ago
July 12, 2023 at 3:22 am Good morning, I have a princess 35 with two cummins 6BTA 5.9 250 hp engines.<br />The port engine maintains a normal temperature of 180/190ĀŗF until 1,200 rpm. When we raise the RPM, the temperature rises to 230/239ĀŗF, however, with an IR gun in the different parts of the cooling circuit, the temperature indicates 180/190ĀŗF.<br />I have changed the thermostat, the temperature sensor and checked the proper functioning of the vdo guage …
2 RepliesJuly 13, 2023 at 4:53 am Thank you for your answer, I think I have already solved the problem.<br />From the exhaust manifold comes a hose to the coolant tank.<br />It had dirt which caused that when the rpm increased, it caused an increase in temperature in that section.<br />Thank youLast Post by:
posted: 9 months ago
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Double Double Vacuum guages?
This topic has 3 replies, has 4 voices, and was last updated by
9 months ago July 10, 2023 at 4:09 pm I installed two double-double fuel filtration systems on my 6BTA’s.Ā None of the 4 vacuum guages are reading at all….like the needles don’t move.Ā I’ve removed the yellow tab at the top and still nothing.Ā Any ideas?Ā
3 RepliesJuly 11, 2023 at 11:19 am Did you watch the Sbmar video on setting the needle sensitivity yet. If your Red needle is set too tight then nothing moves. The Red one keeps the Black from moving. watch the video and adjust the tiny flat point screw in the center of the dial. Righty Loosey and Lefty Tighty.ĀLast Post by:
posted: 9 months ago
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Seaboard Raw Water Alarm
This topic has 3 replies, has 3 voices, and was last updated by
9 months ago July 6, 2023 at 2:33 pm I’ve had the Seaboard Raw Water Alarms on my engines for about 5 years now.Ā Ā Ā I noticed last weekend the one failed to alarm before starting with I turned the ignition on.Ā Ā I gently tapped on the sensor in the ER a few times and it began working again.Ā Ā Later in the weekend, the same thing occurred.Ā Ā Ā Should I remove/replace (or clean?) the switch from the brass fitting to correct this?Ā Ā
3 RepliesJuly 11, 2023 at 7:47 am TheĀ switch just screws out but depending on the sealants age /Ā Ā condition, it may beĀ stuck. Use a rag and channel locks to grip.Ā Any Common silicone seems to work best as a sealantĀ Ā TheĀ electric switch itself is magnetically operated by the plastic paddle and is in a sealed mercury glass vial..Ā If it’s intermittent in operation, it is most likely related to something on the paddleĀ restricting its proper movement.Last Post by:
posted: 9 months ago
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Water flow alarm
This topic has 4 replies, has 3 voices, and was last updated by
9 months ago June 28, 2023 at 1:50 pm Hi, can someone recommend a simple to install water flow alarm or something to notify should my raw water pump fail underway? thxĀ
4 RepliesJuly 9, 2023 at 5:58 pm B series 330 hp, recreational application about 200 hours a year.Ā thx – LewisLast Post by:
posted: 9 months ago
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Aftercooler condensation drain install?
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