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- Cummins Marine Forum Topics
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Hose clamps on coolant/exhaust connection
This topic has 1 reply, has 2 voices, and was last updated by
7 years ago May 2, 2017 at 10:24 am Should the hose clamps on the hose from the exhaust manifold to the block be a constant torque type or is a quality all stainless ok?Ā
1 ReplyMay 9, 2017 at 7:45 pm Single hose clamps on any coolant connections need to be very high quality, especially on any high performance diesel engine.. The constant torque ones that Ā Cummins uses fit that description……………………….We prefer them along with using Rectorseal #5 on all barb/beaded connections Ā and then re-tightening after one or two cold hot cycles..Ā TonyLast Post by:
posted: 7 years ago
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QSC Always On Power Studs
This topic has 16 replies, has 4 voices, and was last updated by
7 years ago April 25, 2017 at 6:55 pm Feeling foolish with the predicament that I find myself in. Bought my boat 3 years ago. Raw water pump was leaking at survey and seller replaced with new. I went to do an impeller service this spring and found the leads going to the always on power studs/terminals for the ECM short and tight and in the way of being able to remove the raw water impeller. Removing the wires from the studs was going smooth thenĀ the nut on the + stud tightened up. I…
16 RepliesMay 5, 2017 at 4:11 am Good job “parts sourcing” and it literally cost you 1% of what Cummins NE wanted to sell you, and a whole lot less work too. Ā Proves that this is the wrong hobby to be in if you are not a DIY with a working brain..Last Post by:
posted: 7 years ago
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Envirovent for QSC?
This topic has 3 replies, has 2 voices, and was last updated by
7 years ago April 24, 2017 at 3:28 pm Tony et al – Installed and used the envirovent system on my QSB’s and was a big fan of them. Ā Is there an Envirovent system for the QSC’s? Tom
3 RepliesMay 4, 2017 at 7:39 pm This a the “factory” system but it’s really not a CCV system.. It’s “idea” is to vent the Ā “crankcase blowby gases to a low pressure areas” near the air cleaner……………………….We have done a few custom Envirovent systems for the QSC, but until you have a “messy” issue that your want to mitigate, I’d let it be.. TonyĀLast Post by:
posted: 7 years ago
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QSM11 intermittent shutdown and fails to restart
This topic has 3 replies, has 3 voices, and was last updated by
7 years ago May 1, 2017 at 2:04 am I have been watching your site for the last couple of years. You helped a good friend of mine with a problem on his Riviera 40 . So here’s hoping I could get some guidance from you. I have a Riviera 47 with Cummins QSM11 @700 hrs. The problem is the starboard engine shuts down randomly anywhere between 0-15 minutes after initial engine start. It mostly would shut down when using the bowthruster when manoeuvring out of the marina. The gauge…
3 RepliesMay 3, 2017 at 8:28 am Yes those systems can be tricky as they’re looped into the engines “ECM Power” circuit… if the syste triggers, the engine will shutdown completely…Ā Do you have an override feature at the helm station in case of emergency?Last Post by:
posted: 7 years ago
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Recurring fuel system issues
This topic has 3 replies, has 4 voices, and was last updated by
7 years ago May 1, 2017 at 12:53 am Hi All, these issues is starting to drive me a little bonkers so I was hoping someone on here could help Changed the fuel lines as the existing ones had worn out and it was time. Ā I had both tanks professionallyĀ cleaned about 6 months ago. Ā Racor housing has been cleaned entirely, multiple times, and I replace the RacorĀ filter every fuel up and it’s usually dirty. Ā I was running about 80% throttle of the port tank, and the engine began …
3 RepliesMay 1, 2017 at 4:24 pm #1——————You need to install a vacuum gauge ( o-30″ Hg) on a hose long enough hose (1/4″ ID fuel line) Ā to get to where you can monitor it..The gauge needs to connect after the on-engine filter and before the pump pump.. Ā You will also need to install one Between the tank and the RACOR so it can monitor the vacuum there right to the tank–Both would be best #2–Most likely things th…Last Post by:
posted: 7 years ago
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What kind of batteries do I need
This topic has 4 replies, has 4 voices, and was last updated by
7 years ago April 30, 2017 at 1:46 pm Hi,Ā My batteries are dying, charge them up and the hold a charge for less than 24 hours before needing the charger again. Ā I’ve checked the alternator and it’s working fine. Ā What kind of marine batteries should I replace these with ?Ā Ā And what kind are they ?Ā I operate a 5.9 liter 330hp cumminngs,Ā run usual electronics, lights, VHF, stero,Ā GPS and fish finderĀ
4 RepliesMay 1, 2017 at 6:57 am No battery will do what it’s supposed to do with cables and connections looking like that. Ā Get everything spic & span & shiny new and reinstall with dielectricLast Post by:
posted: 7 years ago
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Tough decision ahead
This topic has 1 reply, has 2 voices, and was last updated by
7 years ago April 30, 2017 at 3:54 pm Coming up on survey day and still a bit concerned… What I know:The boat in question is a 1998 Maxum 4100 SCA (30,000# semi-V) and has a pair of 6BTA 5.9 M3 at 330 hp each are showing just over 1700 hours on the meter. the boat is 3 hours away so I’ve had limited opportunity to inspect. Both engines started quickly after short preheat (80 F ambient). Both briefly produced puff of steam, a little soot in the water but no sheen.Ā The st…
1 ReplyApril 30, 2017 at 7:25 pm Gary,Ā This is what you need to understand———–Think of Me, Ā Rob , and Corey as a surveyor with “eyes” that miss nothing if you provide good pictures of all and info to boot… Do you really think a picture of an Ā injector pump will do what we need?…………………..You are working with a group of people here that will help you,but YOU have t0 Ā put in the effort to help us&#…Last Post by:
posted: 7 years ago
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How to fix a common oil seep
This topic has 1 reply, has 1 voices, and was last updated by
7 years ago April 29, 2017 at 8:37 pm I had a small leak or seep from a vent return line at the engine block that I understand is a common thing. Ā I disassembled the whole thing and clean,it all up. Then I used rector seal #5 with a fresh square o-ring. I’m hoping it doesn’t leak anymore. Ā
1 ReplyApril 29, 2017 at 8:43 pm More picturesLast Post by:
posted: 7 years ago
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Steam/Running hot
This topic has 16 replies, has 4 voices, and was last updated by
7 years ago February 13, 2017 at 6:27 pm Hi all. Port engine started running warm today. Never set off any alarms. Never topped 200. But i noticed what i first throught was smoke from exhaust. It dissipated almost immediately, Ā which leads me to believe it was steam. This occurred at speed cruise rpm of 2600.Ā No loss of power. No adverse running issues. Ā When i get to dock, Ā i put it on the hose (fresh water flush setup), and the hose, which normally flattens due to suction from the p…
16 RepliesApril 29, 2017 at 7:08 pm Was a finally quit and pay someone to do it deal…..Last Post by:
posted: 7 years ago
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Cummins aftercooler service intervals
This topic has 2 replies, has 3 voices, and was last updated by
7 years ago April 24, 2017 at 7:25 pm Looking to fine out how often I can expect to service the aftercoolers on 6 BTA 5.9 Ā Ā 330 hp. I would assume that this interval would be different for salt and fresh water. I plan on running 200 + hours in the coarse of a 3 month period.
2 RepliesApril 29, 2017 at 6:32 pm CT? Ā Are you up the CT Rvr? Ā If they were never done the Seaboard Way then they are already overdue. Ā Scott’s link and timeframes are good.Last Post by:
posted: 7 years ago
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Fresh water flush – help me decide
This topic has 4 replies, has 4 voices, and was last updated by
7 years ago April 19, 2017 at 12:02 pm So I am committed to installing a fresh water flush system, but am trying to decide if I install on the suction side before the sea water pump or between the sea water pump and the oil cooler. Pros and cons for both setups as I see them: Ā suction on side before the sea water pump: pro – flushes the sea water pump, no pressure on ball valve when running con – need engine running, not 100% fresh water, extra hose clamps (double clampe…
4 RepliesApril 29, 2017 at 1:05 pm I run groco SSC on top of the strainer. I use a section of hose run to a hose shut off at the end of the regular hose.Ā Close through hulls. Put flush on. Turn on hose with shut off closed. Start motor and turn on water from shut off at same time so it doesn’t run dry. When I am done, I turn hose off and engine at same time. Disconnect flush and leave through hulls closed. Ā All water left in system from the pump on is fresh.ĀLast Post by:
posted: 7 years ago
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Max Allowable Crankcase Pressure
This topic has 4 replies, has 2 voices, and was last updated by
7 years ago
April 25, 2017 at 6:38 pm What RPM is best for blow by measurement? What crankcase pressures are consistent with a healthy engine?Ā At what pressures is blow by suspected?Ā Engine is a 6BTA 5.9 330.
4 RepliesApril 29, 2017 at 11:48 am One thing I don’t see in the article is an indication of the vent tube ID.Ā Typically those reading the article will haveĀ the engines handy for measurement and the ID may vary by production year.Ā I am not near the boat but wantĀ to have the plumbingĀ prepared.Ā Can any one tell me tell me what vent tube ID I can expect on 6BTA 5.9 M3Ā engines (S/Ns 4560 1896 and 4560 2659)?Last Post by:
posted: 7 years ago
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QSC shaft seal water outlet
This topic has 5 replies, has 4 voices, and was last updated by
7 years ago April 25, 2017 at 4:02 am Hi All, Ā I am looking for a suitable place to get some water to feed my shaft seals. At quick look today pointed to a 1/4 plug on the rear of the heat exchanger cap? I didn’t check which side of the cooling system it was. Ā Is there a better place? Ā Thanks Luke
5 RepliesApril 27, 2017 at 2:17 am Thanks Tony and Kevin you have given me what I was after.Last Post by:
posted: 7 years ago
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QSB 5.9 Alarm code
This topic has 2 replies, has 2 voices, and was last updated by
7 years ago
April 24, 2017 at 9:15 am Hello everyone. Ā I’m a newbie on this forum. Looking forward to using this forum as a info seeker and learning experience.Ā This morning I had an alarm code 132 “Low sensor throttle”. I have no idea where to look for any issues. Boat seems to perform fine with no issues. I’m stomped! Lol. Hopefully nothing too serious. Any info or help greatly appreciated!
2 RepliesApril 25, 2017 at 4:48 am Thanks Corey. Stands to reason. Two days ago I had to remove transmission. Ā Prior to doing this I disconnected the power to ECU gear junction and a few other things. This could have been a result of.Ā The alarm has not surfaced again.Ā ThanksLast Post by:
posted: 7 years ago
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Exhaust Gas Temperature QSB 6.7
This topic has 2 replies, has 2 voices, and was last updated by
7 years ago
April 23, 2017 at 2:51 am I note from the specification sheet that the EGT at the turbo outlet for my QSB 6.7 550s is 970F. Ā When running at my normal “easy” cruise of 2600 rpms and around 50% load, I see an EGT reading of about 660F. Ā Is this telling me anything apart from it being very unlikely that the engine is overloaded? Ā The EGT does not seem to change a whole lot unless running at displacement speed. Ā It never gets up near the 970 reading even at WOT,…
2 RepliesApril 24, 2017 at 11:25 pm Thanks Tony. Ā I did map the actual fuel curve against the published Cummins curve back when testing props. Ā I am within 5% from planing speed on up to WOT, being slightly above at the lower end and slightly below from 2600 approaching WOT of 3360, where I see about 95%.Ā By the way, the Cummins folks are still unable to diagnose the source of the knocking noise I asked about a few weeks ago. Ā They tried plugging the injectors one at a time and a…Last Post by:
posted: 7 years ago
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Coolant replacement steps.
This topic has 1 reply, has 2 voices, and was last updated by
7 years ago April 23, 2017 at 5:38 pm Hello, I will need to replace the coolant on my 1990 6BTA 5.9 Cummins engines and I was wondering if you have any “best practices” and/or steps that I should follow. Much appreciated. Sam
1 ReplyApril 24, 2017 at 5:38 am Hello Sam, Here are some links as to coolant type, tips on refill, plumbing/drain. Ā Read through these then report back with anything specific. https://www.sbmar.com/community/topic/venting-coolant-systen-on-6bta-370-diamond/ https://www.sbmar.com/community/topic/best-coolant-for-cummins-6-bta/ https://www.sbmar.com/articles/cummins-b-series-coolant-plumbing/Last Post by:
posted: 7 years ago
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Pulling all coolers from my QSC
This topic has 11 replies, has 4 voices, and was last updated by
7 years ago March 26, 2017 at 8:00 am Spent the day pulling all my coolers – heat exchanger, aftercooler, and fuel/gear cooler. Not a fun job and I have decent access. I have owned the boat for a year now and these were serviced Jan15, and at the time of purchase I spoke with the mechanic and had him describe the process he used to service. Even with the right answers I felt it time to make sure all was up to snuff, so off it all comes. I have seen a few ask how much fuel and …
11 RepliesApril 22, 2017 at 10:09 pm Spent the day painting the new aftercoolers. Figured I would throw a fresh coat of paint on the gear/oil and heat exchanger while I was at it. While prepping the gear/oil cooler I found a crack in the brazing at the gear oil fitting. Come to find out the gear/oil cooler doesn’t customarily get pressure tested as the oil is at 350 psi would leak out and the fuel would show a leak in the water in fuel alarm. I wish I knew that and I would ha…Last Post by:
posted: 7 years ago
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Raw Water Leak
This topic has 1 reply, has 2 voices, and was last updated by
7 years ago April 21, 2017 at 3:03 pm I have twin QSB 5.9 440s on my 2008 36′ Norstar with about 1,000 hours. I have been doing most of the engine maintenance myself. I have followed the manual but have added additional work on theĀ sea water side. Last year I pulled the aftercoolers and cleaned the cores per recommendations on this site. The aftercoolers were pretty clean with very little corrosion. After reinstalling the aftercoolers I could not stop a raw water leak on the i…
1 ReplyApril 22, 2017 at 6:29 am Pictures of the leak and of the entire /or overall installation would really help.. Just like you can see what is going on, we need to also “see” it.. Ā Also, what seems confusing to me it that you said you serviced the aftercoolers last year, but then you sent out the gear coolers to have them cleaned. Ā Cleaning the aftercoolers is way more challenging than cleaning a gear cooler? What do you mean by “flushing the aftercooler?…Last Post by:
posted: 7 years ago
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Starter battery
This topic has 4 replies, has 3 voices, and was last updated by
7 years ago
April 19, 2017 at 10:06 am Hi, my starter batteries (6-bta 370hp diamond) are almost dead. Currently I have one Varta LFD230 amp, CCA 1150 on each engine + separate battery for consumption. I am hoping these are overkill so I can save weight and money. Can anyone recommend a good starter battery, alternatively advise whether one of below batteries would be adequate: Varta LFD140 amp, CCA 800 Varta AGM 105 amp, CCA 950Ā
4 RepliesApril 20, 2017 at 10:05 pm Hi Rob, Thanks. I guess that settles the matter. Now the “only” challenge is getting the old 125 lbs batteries out, which are “conviniently” located aft of the engines with the generator in the middle and behind the engine hatch opening…Last Post by:
posted: 7 years ago
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QSC540s showing different load %
This topic has 4 replies, has 3 voices, and was last updated by
7 years ago April 19, 2017 at 12:43 am Hi, I was hoping that someone might be able to help with where to look to solve an issue Iāve got with the port QSC540 showing higher fuel burn & load percentages at the same RPMs. Late last year I had the props re-pitched and a full salt water service. Aftercoolers and everything removed and cleaned. The before scan of the props showed that the port prop had Ā½ā less pitch than the starboard, whether it left the factory like this or has been…
4 RepliesApril 19, 2017 at 8:02 pm Tony, Thank you for taking the time to reply. 1. I’m OK with this and had the props repitched last time the boat was out of the water. If both engines were showing the results that the starboard engine is I would be 6L/hr below the Cummins fuel graph at 2300rpm where I cruise. This was admittedly with new anti-foul but otherwise as heavy as it will ever be. 2. Noted. It looks like I’ll take the port prop back and get them to take ano…Last Post by:
posted: 7 years ago
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Hose clamps on coolant/exhaust connection
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