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- Cummins Marine Forum Topics
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Possible Exhaust Leak
This topic has 4 replies, has 3 voices, and was last updated by
7 years ago January 29, 2017 at 3:44 pm Tony, I have new QSM11 with 70 hours that was put into service Sept 2016. Ā On a recent visual inspection I noticed a little soot near the manifold. Ā Does the attached photo tell you anything or look like a Leak? Ā Best one I could get and only place a saw some soot.
4 RepliesJanuary 30, 2017 at 10:07 am Scott, Is she Ā still covered under warranty? Ā Yes or no, this appears to be a common enough issue that some assistance from Cummins may be worth an attempt…Last Post by:
posted: 7 years ago
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6bta starter issue and removal
This topic has 3 replies, has 2 voices, and was last updated by
7 years ago
January 29, 2017 at 11:39 am Hello all. I’ve got a new issue with one of myĀ 6Bta’s, When I turn the ignition to engage the starter there is about a 1 second delay before engagement. Motor starts up just fine but I want to correct this issue before it gets worse and leaves me stranded.Ā So far I’ve removed and cleaned off all of the corrosion on the relays and solunoid and that didn’t help. The research I’ve done leads me to believe I need to re…
3 RepliesJanuary 30, 2017 at 7:03 am Tony- any tips/tricks to access that third hidden bolt that holds the starter on?Last Post by:
posted: 7 years ago
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Starting issues with both engines
This topic has 7 replies, has 3 voices, and was last updated by
7 years ago
November 20, 2016 at 10:15 pm We are having starting issues with both engines, You can hear the master soleniod engage but the starter motor doesnāt turn. I have replaced the master soleniod and things were good for 12 months, however the problem has returned. There are 3 soleniods and Iām not sure what the other two do, other than the fuel shut off. Can anyone shed some light on my problem. Thanks, Kevin
7 RepliesJanuary 28, 2017 at 9:39 pm Hi All, After getting an electricial down to the boat, to check out the starting system, both engines started first time.Ā He did however check the starting current , which was fine. So I decided to remove the starters and have them serviced, by AES, Henderson, Auckland, NZ.Ā These guys rock, the tech was supprised the slave soleniod was intermittently starting the engines, they were in that bad a condition.Ā They replaced the soleniods and serv…Last Post by:
posted: 7 years ago
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Proper steps of cleaning heat exchanger
This topic has 2 replies, has 2 voices, and was last updated by
7 years ago January 24, 2017 at 7:55 am Ā Gentlemen. Ā I just purchased a heat exchanger maintenance kit, Ā through Seaboard Marine. Ā If possible please, give me the guidelines on properly cleaning the exchanger with the supplied maintenance kit.Ā Ā The only reason I purchased it was the pencil zinc,is broken off inside the exchange. It’s a 1999 Cummins 6BT 5.9 motor/ there is no after cooler….. thanks charlie
2 RepliesJanuary 25, 2017 at 3:33 am And check those caps too: Heat Exchanger Flat End Cap FixLast Post by:
posted: 7 years ago
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Salt in after cooler
This topic has 14 replies, has 3 voices, and was last updated by
7 years ago
January 17, 2017 at 8:14 am Ā My mechanic is servicing the cooling system on my QSC 540’s.Ā Boat has 5,300 hours.Ā I have owned the boat since new and serviced the cooling system regularly every two years.Ā Service is by the book, complete disassembly, removal of deposits, grease all parts and re assembly with new gaskets.Ā Engine zincs are replaced at every routine service. The port after cooler and heat exchanger came apart normally.Ā There was very little salt and …
14 RepliesJanuary 22, 2017 at 4:27 pm Here are photos showing air cleaners.Ā Picture isĀ under exposed but there is no rust on the air cleaners.Ā They were replaced three years ago, no special reason as the originals were in good shape.Ā I ordered a full kit from Walker Air Sep not knowing I could just order the mist filters. There is a photo of air vent on starboard side.Ā It is bone stock and has never been damaged. I took a couple of photos of inside the engine room from up above.…Last Post by:
posted: 7 years ago
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Advice re Fuel Lines
This topic has 8 replies, has 3 voices, and was last updated by
7 years ago
December 30, 2016 at 1:45 pm I recently disconnected the fuel cooler plumbing on my 6CTAs and replaced with the SBmar raw water hose modification. For now the coolers are still in place with fuel lines attached just zip tied up out of the way. When I disconnect the fuel lines in and out of the cooling Ā pipe and connect them together to re-establish the flow path, what can I expect? 1) Will much fuel flow out of either line considering it is the return flow and engine is off…
8 RepliesJanuary 22, 2017 at 5:59 am Boy, don’t I know it. I have no idea what Sea Ray was thinking with this design. I’m a raw rookie at all this but have Ā discovered enough to know it’s better to do the work myself than find out the guy I paid only went half way because it was too uncomfortable. Thanks for the support.Last Post by:
posted: 7 years ago
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White smoke, black soot
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This topic has 33 replies, has 4 voices, and was last updated by
7 years ago November 21, 2016 at 9:04 am Heres’ what going on with my 6CTA 8.3s, CPL 2172 with about 1280 hours. I am hoping to get some answers and instructions on what to do. I posted my questions on another forum, but no specific answers there yet. My engines have always been rather smokey since IĀ“ve owned the boat (for just over two years now). As of late, however, they have gotten ridiculously smokey at startup. When I say smokey, I mean my dock neighborsĀ flee, wildlife disp…
January 18, 2017 at 5:46 am Well that is a positive sign that you did not have an rpm/performance drop, you may come out without piston/ring/bore damage. You need to get an experienced tech down there to pinpoint that oil leak and a full diagnosis before pulling anything apart. Too many variable such as travel time, labor rates, engine room access, etc and too many unknowns to start to ballparking numbers. Ā Plus if the head comes off you’ll be doing further inspectio…
33 Replies
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posted: 7 years ago
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Boost numbers
This topic has 11 replies, has 4 voices, and was last updated by
7 years ago
December 13, 2016 at 2:27 am My own 6bta 250hp Cpl 1322 has been causing me some headaches lately. I am suspecting lack of boost from the turbo as it used to run a lot cleaner out the back (black soot from the exhaust). Full throttle rpmsĀ are 1900 to 2000 at best which I know is way too low. The boat is clean underneath and the prop is clean also. What I would like to know is what sort of figures for boost should I see when I check and will a QSB 5.9 turbo swap with the on…
11 RepliesJanuary 16, 2017 at 1:25 pm Thanks Tony, I appreciate the input.Last Post by:
posted: 7 years ago
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Advice on Coolant for 6CTA 450 Mechanical
This topic has 2 replies, has 2 voices, and was last updated by
January 9, 2017 at 7:23 pm I’ve read a lot on boatdiesel.com about the need to put DCA into the coolant and monitor the levels regularly, making adjustments as needed. I was talking to one of the fellows at SBmar (not sure of a name) a month or so ago and the topic of DCA came up and he suggested plain green Prestone (ethylene glycol) was just fine for coolant in my engines. I know the last time a mechanic did the maintenance they used Prestone. So, who do I follow?…
2 RepliesJanuary 11, 2017 at 8:17 am Thanks so much for this advice Tony. I can just keep doing what I am already by the sounds of it. That was my gut instinct as well. JeromeLast Post by:
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ok , I have a few issues going on
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This topic has 39 replies, has 8 voices, and was last updated by 7 years ago
December 30, 2016 at 9:57 am So I decided to take a day and work on the boat. I set out to do a fresh water flush using (sea flush) which is like a funnel (which sits in the sea strainer) and hose that goes into a big bucket. I run the engines and generator and it sucks up the fresh water and I shut it down. 5 gallon bucket for each one. So….first up is starboard side. I get it all setup, goto flybridge and start it. Run down and water has barely moved. It’s mov…
January 10, 2017 at 1:18 pm Here’s a pic I just ran across. This shows the angle of the exhaust. Still not sure if thats acceptable, 15 degree or more but looks decent. The water line is about 4-5 inches above the bottom of the fuel tank. The exhaust “shower” is about 3 inches past the clamps on the very left. Yeah, they had plenty of room to make the riser even higher. Probably 8+ inches more room above it. 39 Replies
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posted: 7 years ago
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Need to check something I heard
This topic has 2 replies, has 2 voices, and was last updated by
7 years ago
January 8, 2017 at 12:41 pm My boat neighbor’s boat was getting service done on the power plants. He has QSB 5.9’s on Zues drives, I think they are putting out 480 HP. While chatting with the mechanic, I mentioned that I had 6cta 8.3’s and that I take the Aftercoolers off every 2 years to disassemble, clean, lube and reassemble. The mechanic said that with they waited for engine temps to rise, then would take care of the process above. That seemed ve…
2 RepliesJanuary 10, 2017 at 11:54 am Rob – You are correct, I believe in fixing things before they are broke and taking action at the first sign of trouble. I’ve got the aftercooler on and off thing down to about 30 minutes a side, that effort will end up saving me a fortune over time. Also, when detected black smoke at cruise speed (Faint, but noticible), we stopped running the boat on plane and spent a few months debugging. Turned out we had turbo’s which were…Last Post by:
posted: 7 years ago
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Qsl9 crankcase blow by
This topic has 18 replies, has 3 voices, and was last updated by
7 years ago December 16, 2016 at 5:52 pm First post here. I’m a commercial crabber out of the sf Bay Area. I have a 35rp lobsterboat that I just repowered with a qsl9 405. Engines running great and I’m just getting ready for my second oil change. My question concerns the breather tube off the crank case. I’m getting a good amount of smoke from the tube when at low rpms. A slight bit of oil, not enough to drip. The field tech said it may be from too much oil but we adj…
18 RepliesJanuary 4, 2017 at 9:15 pm Good on you! Let us know how the 180 t-stats work and whatever else you end up doing. Us recreational guys learn A LOT from the commercial high time guys. Cheers, philLast Post by:
posted: 7 years ago
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Timing pin
This topic has 2 replies, has 2 voices, and was last updated by
7 years ago January 2, 2017 at 11:45 am Rainy day so a good one to start some mechanicals. Going to start with valve lash checks, then new injectors, then thermostats. Can someone direct me to finding the timing pin on my C series engines? Thanks, Justin
2 RepliesJanuary 2, 2017 at 1:48 pm Awesome, thanks!Last Post by:
posted: 7 years ago
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engine temperature guage
This topic has 2 replies, has 2 voices, and was last updated by
December 30, 2016 at 9:16 am Somehow during the installation of remote oil kite, the engine temperature gauge on Port side became non functional. Ā Has to be a wire bumped loose during the crawling around. Ā Can someone point me to the location of the temperature sending unit and save me some time hunting around. thanks
2 RepliesDecember 30, 2016 at 2:55 pm Hey Rob – Yep, it was right where you said it would be, I could see the one wire hanging loose. Ā Of course, I couldn’t fit my hand in to reattach it with out some component removal. Ā At times I think the guys who design the service points on these engines need to spend a good year in the field. My favorite is the bolts holding the stock exhaust elbow to the turbo. Ā The configuration is such that you can’t get a socket on it, an…Last Post by:
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Oil sample results, worried.
This topic has 10 replies, has 5 voices, and was last updated by
7 years ago December 21, 2016 at 3:48 pm I got a verbal update from my mechanic today, oil samples on both engines showed elevation in Chromium and Aluminum, which has me worried. Ā The engines are running flawlessly with no smoke at any RPM and good load carrying, producing correct boost etc. Ā I will get specific numbers on the readings when the report is delivered to me. Last year, I pulled apart and replaced badly worn after coolers. Ā Even though I’d hit the two year mark to th…
10 RepliesDecember 30, 2016 at 9:41 am If this is worth anything….when I bought my boat the oil sample failed in a few areas. A mechanic noticed the previous owners used the boat for 10 hours per year (really didn’t use it at all) and he said change the oil/filters etc and run the boat for 5 hours and retest. Ā They did and it passed. I could be wrong here but the theory was something like this. The boat sat, salt water air put a little deposit or rust on the walls, then w…Last Post by:
posted: 7 years ago
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Blue Fuel Cooler Hose
This topic has 2 replies, has 3 voices, and was last updated by
7 years ago December 28, 2016 at 2:19 pm so what is the consensus is this Blue Fuel Cooler Hose worth the additional cost?Ā do they last longer?Ā anyone using them, happy with them? http://www.ebay.com/itm/231472651848?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
2 RepliesDecember 29, 2016 at 5:53 am I took those pics that Tony posted. Ā Oddly enough those 370’s maintained 185 deg F at full load but the owner admitted he had no idea as to any seawater servicing whatsoever…..he simply said “hey if it ain’t broke why fix it.” —- What a shocker……..When I pointed out those hoses his eyes popped out more than the hoses! Ā So I asked him when was the last time he took a ride in his engine room at crui…Last Post by:
posted: 7 years ago
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Cummins Engines 6BTA 5.9 Info Needed
This topic has 8 replies, has 3 voices, and was last updated by
7 years ago
November 18, 2016 at 2:37 am Good Day All I am new to the forum and need some help. I just purchased a 1995 Sea Ray 440DA. I have twin cummins engines but don’t have any manual or info on them. Want to perform some maintenance and will need part numbers. Below is the info that I have on them ESN 45047068 ESN 45047143Ā HIN SERP23254495 CPL# 1928 Ā DR5043RXĀ Original Customer # 1092 Any info would be greatly appreciated
8 RepliesDecember 27, 2016 at 8:32 pm Don’t know if you are still here but you should be able to get manuals and parts book from Cummins. Ā Ā Have your engine serial numbers at hand. Ā You may have to wait a time for them but get them ordered.Last Post by:
posted: 7 years ago
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6BTA 370 setup the "Seaboard Way"
This topic has 2 replies, has 2 voices, and was last updated by
7 years ago December 24, 2016 at 2:06 pm 25 Terry Jason down east lobster boat: Project Oct 2013 through June 2016. #1 goal among many was a 22-23 knot cruise conditions permitting without beating on the engine ! Tony Athens engineered powertrain: Cummins 6BTA 370…..ZF63A 1.54:1 gear…..1.75″ shaft….5″ exhaust…..20X20 DQX prop…..engine “propped loaded for bear” @ 3250 WOT. SMX Aqualarm, 180F Temp switch on custom Seaboard exhaust sys…
2 RepliesDecember 27, 2016 at 8:08 am Bill Desmarais wrote: …ā¦consider a 160F SMX tstat and ALARM your engine to the teeth ! Great stuff, awesome boat, thanks for posting Bill. Ā I could not agree more with your above statement. Ā My first season with my B’s I had custom Borel panels made up and I put together a real nice alarm system with a total of 5 switches per engine (engine oil psi, gear oil psi, coolant temp x2, and exhaust mixer temp). Ā After reading all about your…Last Post by:
posted: 7 years ago
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QSC 540 derating
This topic has 5 replies, has 3 voices, and was last updated by
7 years ago December 22, 2016 at 3:31 am Hi All , Is it possible to derate a QSC 540 down to around 400hp on the ECU? I think I am asking something that is impossible but I can ask. I understand the engine sees the prop but the class surveyor sees the the plate on the engineĀ and works from that even if its a bit backwards.
5 RepliesDecember 24, 2016 at 4:59 pm Thanks for the input Tony, I agree with the engine sees the prop principle but the surveyor and the local authority says the shaft sees the engine HP not what is has to turn. Rob I am in the process of a insurance claim and looking to findĀ replacement engine options with the least amount of major refit if insurance leaves me holding the bag . In a ideal world I will re shaft and prop to around 500hp but it depends on what the numb…Last Post by:
posted: 7 years ago
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6bta 370 questions
This topic has 2 replies, has 2 voices, and was last updated by
7 years ago
December 23, 2016 at 11:40 am I have a 2001 Downeast style boat with a single 6bta 370. The boat has fiberglass fuel tanks. The warmest seawater temp we get here in Northern Cal is about 65 degrees. Would it be safe to remove the fuel cooling system to obtain better access to the raw water pump? How warm would the fuel going into the fuel tanks get?The boat idles for long periods sometimes while fishing. Ā Second question. Can I run the engine at idle with a garden hose hooke…
2 RepliesDecember 24, 2016 at 8:51 am Perfect! Exactly what I needed. Ā Thanks, TonyLast Post by:
posted: 7 years ago
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Possible Exhaust Leak
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