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- Cummins Marine Forum Topics
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6B5.9 Belt Guard Bolt Oil Leak
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago December 4, 2022 at 3:25 pm One of my 2, 370 HP diamonds (CPL 2208) leaks (heavily) from the belt guard lower right attachment bolt (viewed from engine front). <br />Belt guard has different length bolts (3 bolts total)). Which length goes here?<br />Is there some sealing procedure for this bolt?
1 ReplyDecember 5, 2022 at 11:41 am Check out this link: Oil Leak 6bta 330Last Post by:
posted: 1 year ago
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Barry Mount install on 6BTA5.9 210HP
This topic has 3 replies, has 3 voices, and was last updated by
1 year ago
August 29, 2022 at 10:23 am Hi, On this 1992 Mediterranean 38, with two 6BTA5.9 210HP, the vibration isolators (engine mounts) seem to be shot, at least that is my guess.<br />Boat is vibrating/rattling like crazy when in idle, and rattles even more when idling in gear.<br />When raising the RPMs to 1100 and above, in gear or not, rattling and vibration subsides. Pretty sure these are the original OEM ones and engines have 1500h on each. See pics. Questions:…
3 RepliesDecember 4, 2022 at 9:19 pm I have the same boat w/ same engines and same symptoms. Did you replace with the bushings inc or go with the Barry/SMX mount?Last Post by:
posted: 1 year ago
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6bt5.9m SBMAR tensioner bouncing
This topic has 10 replies, has 4 voices, and was last updated by
1 year ago
December 2, 2022 at 10:09 am The tensioner is 7 years old. Probably 2000 hrs. Both engines do the same thing. Is this normal? Thanks, Dave
10 RepliesDecember 4, 2022 at 10:46 am I bought it of you guys as part of the belt mod you recommend.Last Post by:
posted: 1 year ago
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2011 Cabo 40 WOT
This topic has 6 replies, has 3 voices, and was last updated by
1 year ago
November 28, 2022 at 7:15 pm Hello I have a 2011 Cabo 40 that just underwent full service including a top end rebuild on the stbd QSC600 and two new turbos. We have sea trialed the boat 3 times and we are constantly getting just under 3000 rpm at WOT. Fuel burn and load look pretty good etc. wondering if these 600hp 8.3s with Zeus pods should be turning up over 3000. Attached are the screen shots of WOT today. <br /><br />
6 RepliesDecember 4, 2022 at 8:08 am Thanks for that information. The boat is running great so we will probably make the trip savannah to st Mary’s and schedule a haul out to grease the wheels etc. if I interpret what you are saying correctly, it may not be worth spending the money on a prop shop. Perhaps I just need a slightly different prop? Attached is the vessel view from yesterday.Last Post by:
posted: 1 year ago
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4BT cooling upgrades input
This topic has 2 replies, has 3 voices, and was last updated by
1 year ago December 2, 2022 at 10:10 am I am finally beginning the process of upgrading my 4BT cooling to match the 6BT 210hp. I wanted to get some input on the direction I am going. I purchased expansion tanks that I believe are made for a 6bt used for a generator. These seem to be the best I can find that will work in the limited space my boat offers. These tanks came with a bracket that I am modifying to fit my 4bt’s. I attached a picture and circled the holes that I am…
2 RepliesDecember 2, 2022 at 7:56 pm The 4BT “shakes” vigorously to put it mildly at low RPM / Idle speed. I had problems with a similar expansion tank that I modified and mounted with brackets. I had a weld crack and leak coolant. The reason for this crack is possibly from me not being a professional welder. After that I mounted both my expansion tanks “remotely” on the bulkhead wall and could not be happier with the performance. The problems I had are in…Last Post by:
posted: 1 year ago
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QSC 8.3 600 HO saltwater side capacity
This topic has 4 replies, has 4 voices, and was last updated by
1 year ago
December 1, 2022 at 10:17 am I own a 2010 3900 Tiara with twin Cummins QSC 8.3 600 HO diesels. I’m searching for, and cannot find anywhere, what the saltwater cooling side capacity is. I’ve called Cummins and Tiara – they both told me to call the other. I can’t believe Cummins doesn’t know this. Does anyone know the saltwater cooling site capacity. The engines have the typical marine gear cooler, turbo after cooler, and engine heat exchanger. …
4 RepliesDecember 1, 2022 at 7:11 pm I’ll chime in with 11 gallons. Use that and you’ll see it come out the exhaust no problem. I use -100 just in case there’s some residual SW diluting it but 11 gallons will sort you NP.Last Post by:
posted: 1 year ago
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4BT Exhaust Minimum Diameter
This topic has 4 replies, has 3 voices, and was last updated by
1 year ago November 28, 2022 at 8:55 pm I have twin Cummins 4BT’s (150hp) with the standard OEM exhaust elbows bolted directly to the turbo outlet flange. I plan to fabricate my own dry risers to increase the spill over height. The existing ID of the factory elbow is 58mm at the smallest part. The new dry riser will have 3 long radius bends and approx length of 500 – 700mm to where the wet mixer where the Dia will increases to 100NB. Will using 65NB pipe for the dry rise…
4 RepliesNovember 30, 2022 at 8:00 pm All is good..Last Post by:
posted: 1 year ago
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Alternator Fuse Location: QSB6.7
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago November 30, 2022 at 3:56 pm New-to-me boat and engines: 2019 QSB6.7 480s. Has the ‘factory standard’ 160A Delco alternators. How are these fused….is there an internal fuse or are they mounted on the engine? Or not fused at all? Right now, each alternator charges separate Start batteries. I want to combine the P & S Start batteries into a single Start ‘bank’, charged by the Port alternator only. I want to dedicate the Stb alt to the H…
1 ReplyNovember 30, 2022 at 6:37 pm Never seen a fuse on the alternator output on a QSB 6.7. But that does not mean you don’t have one as many boats have custom OEM wiring. BUT IMO, I’d never share batteries between house loads or engine to engine under normal operation with a electronic engine.. So many batter ways to have both alternators charge the house bank yet charge each start battery automatically yet keep them from talking to each other and not loose the safet…Last Post by:
posted: 1 year ago
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QSB 5.9 Gear Temp high
This topic has 5 replies, has 2 voices, and was last updated by
1 year ago
November 13, 2022 at 7:09 am Hello Smartcraft vesselview showing s/b ‘Gear Temp’ @ 55 on start up – port around 14 – firstly I do not know what this means and secondly what part (sensor) would i need to replace it with and where is it and what does gear temp refer to – is it oil temp for gearbox or coolant or something else please TIA Nick
5 RepliesNovember 30, 2022 at 1:52 am Part 15 is the temp sensor for transmission – so I just need to locate it now – not sue where guy got schematic from but if anyone recognises it could be useful with indexed part numbers attachedLast Post by:
posted: 1 year ago
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6CTA Aftercooler Maintenance
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago
November 27, 2022 at 2:58 pm I have twin 6CTA 480CE and I am i the process of cleaning and maintaining the aftercoolers. I noticed in the video provided, that the plastic strips on the corners of the core are removed, but I never see them replaced later in the video and they don’t appear to be in the rebuild kit. Are these necessary? Can I purchase them separately? Thank you, Dan
2 RepliesNovember 28, 2022 at 3:48 pm Thank you!Last Post by:
posted: 1 year ago
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Cummins 5.9 330hp aftercooler zinc stuck
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago
November 25, 2022 at 11:21 am Just serviced lower E2 zinc on aftercooler, piece is left in the passage upon removal. Is there space inside to bump that 1 inch long remnant into the inside with a wooden dowel and put in a new zinc? Thank you for your insights.
2 RepliesNovember 28, 2022 at 12:34 pm Thank you Rob for your prompt reply, I was on the road. I am familiar with Tony’s service approach on these aftercoolers, this one has 100 hours on it since new for a previous owner so I am not ready to do a complete teardown for the sbmar treatment just yet. The zinc piece is broken off so I will likely end up taking the cooler cap off to remove the small broken off piece. (Unless you happen to have a nifty method for broken zinc pieces i…Last Post by:
posted: 1 year ago
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QSL9 pto setup
This topic has 6 replies, has 2 voices, and was last updated by
1 year ago
November 23, 2022 at 8:48 pm Looking to do clutched 30gpm hydraulics in the most efficient way possible. My hydraulic guy is leery of harmonics associated with this engine and machining and bolting pitts clutch to the crank. I’ve looked over Tony’s previous installs. Have 2ft max in front of the main for the pump and to squeeze by, limiting options for much of a drive shaft, if any. Have looked at MER SeaDrive units as an option $$$. This is where I found out about getting …
6 RepliesNovember 27, 2022 at 9:05 pm Email sent.Last Post by:
posted: 1 year ago
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Cummins Thermo Switch
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago
November 26, 2022 at 9:25 am I removed a thermal switch from the upper port side of my engine (Early 6BT, CPL 742) this morning. (Cummins part # 194505) I did some searches but found very limited information on the part. Is this part just a thermal switch for the high-temperature alarm? Is this the best location for high temp readings? I had planned on placing my new coolant thermal switch closer to the thermostat on the top of the block.
2 RepliesNovember 27, 2022 at 4:28 pm Thanks, Tony. I have learned so much from your site. Thanks for sharing your knowledge and experience.Last Post by:
posted: 1 year ago
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Fuel Shutoff Solenoid Wiring on Early 6BT CAV Injection Pump
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago November 26, 2022 at 7:03 am I have an early 6BT (CPL 742) with the Delphi Lucas CAV Injection Pump. I am re-wiring my engine (old harness is gone) and am trying to figure out the wiring for the fuel shutoff solenoid. I have reviewed all the wiring schematics on the forum and in Tony’s Tips. It appears that my shutoff valve only uses the purple lead from the ignition and has no white lead from the mag switch. Is it correct that there is not a separate “suck-…
1 ReplyNovember 26, 2022 at 8:17 am The “purple” wire that will go to the CAV pump will get an ignition “on” 12 Volt signal. I am not sure about wiring it to the MAG switch tho. The MAG switch will get a 12 volt signal when “cranking” to activate the starter. I rewired my engines and kept it as simple as possible…we are in the “marine” environment and every less connection we have is one less that will corrode over time……Last Post by:
posted: 1 year ago
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Turbo Install Questions
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago November 25, 2022 at 3:40 pm A few questions about installing my repaired turbo on my 6BTA 330… I saw the article on the Turbo/Manifold gasket. Does RTV get applied to both sides of the gasket or only the turbo side? From the photos it looks like only the turbo side? 2. Does the exhaust elbow/turbo gasket get installed dry? I don’t have the graphite gasket. My turbo surface is clean/smooth and I’m assuming the flange on the new Seaboard custom rise…
1 ReplyNovember 25, 2022 at 4:30 pm Both sides Intended for dry install on perfect surfaces, some of that RTV can’t hurt. Yes pre-oil the turbo top down. Changing a Turbo to Exhaust Manifold Gasket on a Cummins Mid-Range EngineLast Post by:
posted: 1 year ago
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2005 cummins qsb 5.9 fuel pressure
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago November 21, 2022 at 5:24 pm port engine lost power recently after an outstanding summer of run time. error message on new SMX display popped up. I replaced fuel filters and racor filter elements. Port was slightly darker than stbd filter. Stbd engine runs fine, westerbeck gen runs fine. Port Fuel filter full. Bled injector lines fuel leaked out but did not spray out. looking for suggestions. got several opinions, bad injector causing lack of pressure injector pump soleno…
2 RepliesNovember 25, 2022 at 4:18 pm do you have a good cummins techLast Post by:
posted: 1 year ago
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Proper 6bta heat exchanger cleaning
This topic has 4 replies, has 5 voices, and was last updated by
1 year ago November 13, 2022 at 2:12 pm Pulled my starboard heat exchanger off and it looks pretty good compared to some I’ve seen, but before I repaint and reinstall what is the best way to clean the tubes while it’s out of the boat? Is an hcl soak ok for the entire assembly or not needed? engines are 5.9 6bta m3’s 330hp.
4 RepliesNovember 25, 2022 at 8:46 am Replacing with new is over the top in my opinion. The H Ex does not fail catastrophically. Sure proactive replacement of a gear cooler is recommended, especially on the motor oil gears that run full operating pressure on the cooling circuit but a heat exchanger can get a full service and testing on the bench. I understand everyone’s spending habits are different as are their desires to turn wrenches but a blanket statement to simply replace a n…Last Post by:
posted: 1 year ago
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Cold Wx diesel treatment 6CTA
This topic has 7 replies, has 6 voices, and was last updated by
1 year ago
November 6, 2022 at 1:34 pm Leaving the boat in the water for the winter in Rhode Island Last time I did that in late Dec on another boat the diesel jelled and since the tanks were topped we had to spend a whole day warming up the entire boat to be able to get it to start. Good times. Power Service has a cetane boost/antigel product that claims is is endorsed by Cummins, https://powerservice.com/psp_product/diesel-fuel-supplement-cetane-boost/ Any experience on using it? a…
7 RepliesNovember 24, 2022 at 7:57 am Hi Todd, nothing really special that you need to change filter often. This is simply a good additive. I change my primary racor every time I fill up. In my mind, it $10 on a $300 tank full of diesel. Some people think I am nuts, which I am, but I have done this for years and never have a fuel issue. I also am religious about Power Service and it has worked very well for me. Maybe we see each other on the high seas. Happy Thanksgiving. …Last Post by:
posted: 1 year ago
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ESN & CPl help
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago November 22, 2022 at 2:36 pm Hi,<br />Looking to identify an older 6BTA<br />See attached pic showing ESN & CPL.<br />Considering it for a repower on a <br />50’ displacement trawler style launch,<br />with a 4:1 reduction.<br />It has been marinised which suggests <br />it may have been manufactured as an i<br />industrial engine or generator?<br />Any help appreciated.<br />Thanks<br /><br /><…
1 ReplyNovember 23, 2022 at 7:38 pm The engine was built/ set up as a fire pump engine —close to “constant speed” once under load –You have a CAV injection pump/fuel system that is calibrated for 208 HP at 2100 RPM.. You also have a seawater system and or cooling system that I’d have to “see” to comment on how that is plumbed–Some can be quite odd. At this point, think of it a being able to do what a 6BT 5.9 210 can do with possib…Last Post by:
posted: 1 year ago
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Qsc Wastegate exhaust leak
This topic has 3 replies, has 3 voices, and was last updated by
1 year ago November 16, 2022 at 8:52 pm Noticed soot build up around turbo housing. Took heat shield off today and leak is where the linkage enters the turbo. Is there a fix for this? Thanks in advance. <br /><br /> Mike
3 RepliesNovember 21, 2022 at 3:36 am I had 2 x turbos have a crack in between bolt holes. Exactly the same place made me think it was a casting flaw.Last Post by:
posted: 1 year ago
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6B5.9 Belt Guard Bolt Oil Leak
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