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- Cummins Marine Forum Topics
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QSC 8.3 Coupling Bolts
This topic has 8 replies, has 5 voices, and was last updated by
2 months ago March 6, 2024 at 11:04 am Hi everybody! I have a QSC 8.3 500 HO driving a ZF 305 3A transmission. I’m trying to find 12 couplings bolts (and nuts). 5/8″ fine thread (18) x 2″ long – 12 point “extra hard”. Impossible to find (on this planet). Any help locating these would be appreciated. Thanks everyone! Bobby
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in: Cummins Marine Engines
8 RepliesMarch 14, 2024 at 6:28 pm Thanks Gene. Very helpful information. I will go with this.ĀLast Post by:
posted: 2 months ago
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12v or 24v Alternator For QSC 8.3L with a 24V starter bank
This topic has 5 replies, has 5 voices, and was last updated by
2 months ago
March 9, 2024 at 3:23 pm New to forum. Hope this question falls within the bounds. Have recently acquired a Nordic 44 with a 24v starter battery bank (two 12s in series) for a 600 HP, Cummins QSC 8.3L. Ā Recently, had an alternator failure while on a trip. Ā Replacement alternator (that a dockside mechanic put it in) was labelled 12V. Ā Was this an error? Ā Don’t I need a 24V alternator to charge my battery bank? Ā Thanks, Michae
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in: Cummins Marine Engines
5 RepliesMarch 14, 2024 at 6:51 am The standard configuration for the Nordic Tug 44 has been 100% 24 volt since its inception about 10 years ago. (Update from the previous Nordic Tug 42). Of course these are highly custom boats so anything is possible. However, it is very likely to be a completely 24 volt system, including all engine and battery related items as well as lighting, appliances, etc.Last Post by:
posted: 2 months ago
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Correct cummins paint
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This topic has 26 replies, has 14 voices, and was last updated by
2 months ago January 1, 2017 at 9:05 pm for a cummins QSC8.3-540 with a CPL8017 is the correct cummins white paint part number 3885912?
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in: Cummins Marine Engines
March 9, 2024 at 9:51 am My long term Rattle Can Experience. 1–Heating the can in hot water to 100-140F makes for a superior spray experience– 2– you cannot over shake 3–keep some real lacquer thinner in a baby food jar–Soak your spray tips in it and then blow them backwards to clean them using an air nozzle Hope this helps the frustration level some
26 Replies
Last Post by:
posted: 2 months ago
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Fresh Water Flush, SMX1730 pump
This topic has 9 replies, has 5 voices, and was last updated by
3 months ago February 6, 2024 at 1:55 pm I just bought a 33 tiara with cummins 330 cpl 1975 engines. They have a lot of seaboard parts including the SMX1730 raw water pumps. There is what appears to be a connection to a high pressure port on the pump. The seller said he used it to fresh water flush the system but without running the engine. This was process was used after the sea trial. They left the seacock open, attached the dock water line to a hose with a plastic valve on it, energ…
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in: Cummins Marine Engines
9 RepliesFebruary 8, 2024 at 7:56 am It’s not high and low pressure.Ā It’s intake and output or suction and pressure.Ā See attached.Ā The suction port is “before” the impeller and the pressure port is “after” the impeller.Ā for the purpose of flushing, think of the impeller as a door that is closed when the engine is off.Last Post by:
posted: 3 months ago
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QSB 5.9 425 HO
This topic has 11 replies, has 6 voices, and was last updated by
4 months ago
July 11, 2022 at 5:10 am HiĀ We have a 2006 Sea Ray MY with QSB 5.9 425 HO.Ā I am trying to determine if we have a prop pitch issue.Ā I confirmed with Cummins technical assistance that the power curve that I have is correct.Ā We are able to achieve the correct RPMs at WOT and fuel burn is within the curve.Ā However, at 2000, 2200 and 2400 fuel burn is above the curve as shown below: C&S Ā Ā Ā Ā Ā Ā Ā Ā Cummins Spec Sheet Actual Ā Ā DifferenceĀ Ā Ā RPM …
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in: Cummins Marine Engines
11 RepliesJanuary 9, 2024 at 9:39 am Chris was wondering how you made out with tuning the props where did you wind up?ĀLast Post by:
posted: 4 months ago
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SMX EGT Probe Install
This topic has 2 replies, has 3 voices, and was last updated by
4 months ago January 7, 2024 at 8:45 pm Have 2- qsb 5.9 with year old De Angelo risers they have a 1/4″ square nut where probe goes into exhaust,Ā no room for wrench would 6 point socket be my best bet? Not looking to mess the head up with wrong toolĀ
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2 RepliesJanuary 8, 2024 at 1:35 pm Yup, on Amazon search for Pipe Plug SocketLast Post by:
posted: 4 months ago
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Fresh water supply flow rate for Sherwood pump on CAT 3126 TA
This topic has 8 replies, has 5 voices, and was last updated by
4 months ago
December 13, 2023 at 4:08 pm I subscribe to the value of fresh water flushing my CAT 3126 TA engines every time I return to port (the boat lives in a Salt Water environment). I have purchased and installed 3 of Tony’s bronze fresh water flush caps for Groco ARG series strainers (one for each engine and one for the generator). I consider my fresh water supply volume and pressure at the boat house to be strong (sorry no objective water flow rate data available) &…
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in: General Discussion
8 RepliesDecember 26, 2023 at 3:34 pm Thanks Gene.Ā Ā Upon reflection what you say makes perfect sense.ĀLast Post by:
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6BTA Starter/Mag Switch questions
This topic has 8 replies, has 4 voices, and was last updated by
November 24, 2023 at 12:51 pm Hello all, I have a recently rebuit 6BTA and just have a couple question about the wiring of my starter. I read all about the Mag switches and can’t seem to find one on my 6BTA. I’m wondering if the starter I have needs one or is it built in? Any help is appreciated.Ā ThanksĀ
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in: Cummins Marine Engines
8 RepliesNovember 28, 2023 at 6:06 pm Sorry, I was not trying to correct anyone’s terminology. Just pointing out that the starters discussed here are not the same as in an old Ford Fairlane. Those really did have a genuine bendix starter, which is a cheap alternative for relatively low-end use. Because of the extra electrical power needed to push the pinion in a Cummins starter the mag switch is quite important.Last Post by:
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Prime/fuel issue – 2004 Cummins 480CE’s
This topic has 10 replies, has 4 voices, and was last updated by
6 months ago
October 23, 2023 at 4:01 pm Hi Everyone. Ā Changed all 4 engine RACORS + generator. Ā Went to start up both engines, port engine started up with no issue, starboard not so lucky. Ā Ā Primed it and fired up no problem. Ā Ā Fast forward, took the boat on a trip 30 miles, parked it and got back to boat — starboard started up for about 30 seconds and died. Ā Ā After further investigation, it looks like the prime valve is leaking a little. Ā Ā Ā I ended up limping the boat b…
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in: Cummins Marine Engines
10 RepliesNovember 14, 2023 at 12:04 pm More troubleshooting today. I hooked up a sucker pump with additional line via the RACOR to simulate the boat trying to get fuel. Interesting enough, I got a lot of girlge (air) noises when doing so and then about 5-10 seconds later after the air purged, poof… fuel was flowing through there very steady. <br /><br />Is it possible that I got all the air out of there? Is there some other kind of pump associated with/near the Bosc…Last Post by:
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Perplexed! Performance/Propping my 6CTA’s
This topic has 10 replies, has 6 voices, and was last updated by
6 months ago
November 7, 2023 at 10:12 am Hey guys, I purchased my Formula 41PC with twin 6CTA’s a little over 2 years ago now and I have been absolutely struggling to get my RPM’s and props dialed in. The boat had a set of 5 blade’s on her that were only reaching 2400 RPM’s and after reading all of Tony’s Tips related to propping and revs I knew this was nowhere even close. My spare set of Michigan 4 blades got me a bit closer at 2500 rpms and after giving…
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in: General Discussion
10 RepliesNovember 10, 2023 at 4:03 am From this site, boost port: https://www.sbmar.com/articles/boost-fitting-locations-for-b-c-series-marine-diesels/ I see 28 to 31 PSI on our boost gauges (6CTA8.3-M3)Last Post by:
posted: 6 months ago
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Cummins QSB 5.9 230HP Oil Change
This topic has 4 replies, has 4 voices, and was last updated by
6 months ago November 3, 2023 at 5:46 am Good Morning, Am hoping that someone can point me in the direction of a good video that shows how to change the oil on a QSB 5.9.Ā Will be my first one so I would like to do it right. Thanks in advance, Craig
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in: Cummins Marine Engines
4 RepliesNovember 4, 2023 at 5:09 pm Further to my post Oil Pan Capacities for Cummins Marine EnginesLast Post by:
posted: 6 months ago
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House Batteries Not Charging
This topic has 18 replies, has 8 voices, and was last updated by
6 months ago
September 29, 2023 at 2:17 pm Engine is a single 6BTA.Ā Looks like the alternator is not charging the house batteries.Ā Here is the scenario:Ā When I am running on the generator and the battery charger is running, there are no electronics issues.Ā If the generator is shut off and the engine is running, after a couple hours, the house batteries appear to start to go down and the first symptom is that I start to lose my troll function on my Glendinning controls, likely due to …
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in: General Discussion
18 RepliesOctober 27, 2023 at 4:28 pm Glad you found it an it was simple.Last Post by:
posted: 6 months ago
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QSB 5.9 425 Engine Mounts
This topic has 2 replies, has 3 voices, and was last updated by
7 months ago October 6, 2023 at 11:13 am Hello.Ā I believe I have some mounts that are in need of replacement and just wanted to confirm the proper replacements.Ā Based on the Seaboard Store it appears the mount I would use for my QSB 5.9’s are the 4931364 / 5301975.Ā My motor physically has the 3349230, pictured.Ā It looks like the SMX purple is a alternate replacement for the 3349230. Are the SMX purple or 3349230’s the way to go ?Ā Should the motors have had the 4931364 …
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in: Cummins Marine Engines
2 RepliesOctober 7, 2023 at 7:44 am Based on the pictures, use our SMX Purple 70’s—————-Totally “Plug & Play”Last Post by:
posted: 7 months ago
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How to change Racor filter
This topic has 1 reply, has 2 voices, and was last updated by
October 6, 2023 at 11:22 am When I change the Racor filter only and some fuel is lost in the process (no longer filled to the top of the Racor), do I need to refill it to the top?Ā I have installed the squeeze bulb priming kit between the last chance filter and the Racor, but I’m guessing just squeezing the bulb to prime the Racor in this case won’t work since the last chance filter will remain in place (nowhere for the fuel/air to go to when squeezing the bulb…
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in: Cummins Marine Engines
1 ReplyOctober 6, 2023 at 3:02 pm I have always refilled mine, but I do not believe a small gap will hurt. I think it will fill itself over time. The simple solution is to fill with the squeeze bulb before you put the top back on the Racor. Carefully, of course.Last Post by:
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QSB 5.9 Operating Temp 210Ā°
This topic has 10 replies, has 9 voices, and was last updated by
7 months ago
September 11, 2023 at 12:55 pm A guy I know has a 39 SeaRay with QSB 5.9 380 motors. Ā At speeds above 18 knots he gets an overheat alarm. Ā Engines are at 210Ā° at 18 knots cruise speed (verified with laser therm). Ā His mechanic tells him 210Ā° is normal for that motor and he thinks the overheat alarm is due to a bad sender. Ā The local Cummins dealer says trucks are running that motor at 210Ā° all day long. Ā Is an operating temp of 210Ā° normal for this motor? Ā 210Ā° seems high to…
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in: Cummins Marine Engines
10 RepliesSeptember 27, 2023 at 7:23 am He is crazy. I had that same boat, if itĀ is a Sundancer, and after servicing everything, as mentioned by Steve, I ran that boat at 25-26 mph all day long and never saw temps above 180. I bet his EGT is off the charts.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
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. …
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in: General Discussion
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:
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yanmar 4lha-ste engine temp.
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This topic has 23 replies, has 4 voices, and was last updated by
8 months ago August 3, 2020 at 10:08 am Starboard is burning more fuel, higher temp, slightly higher oil pressure and minor darker exhaust vs the portside. (only happens when 2500+ rpms / cruising out) Any ideas? heat exchanger? too much fuel/burning rich? Thanks! Engines: twin turbo diesel yanmar 4lha-ste
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in: All Other Marine Diesels
September 20, 2023 at 11:49 am If it were me, I would go with the following https://www.sbmar.com/product/bronze-tee-adapter-for-freshwater-flush-system/ The valve is only for safety.Ā It will always be open as well the sea cock. And then this https://www.sbmar.com/product/stainless-freshwater-flush-thru-hull/ and a Ā¾ inch hose barb to fit the thru-hull fitting and one to fit the top of the valve. And Ā¾ inch reinforced tubing All bronze, no plastic. Or if you have Groc… 23 Replies
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posted: 8 months ago
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QSB 6.7, 480 INT, 1 blown engine, 1 cracked valve at 4400 hours
This topic has 4 replies, has 3 voices, and was last updated by
8 months ago
September 8, 2023 at 12:05 pm Hello Tony, First off, I’d like to give a shout out to Ben in your parts department. He helped us with getting a head gasket, after Cummins dropped the ball, and saved me $4,000 in business. I operate a tour business in Washington State and have been running Cummins engines for the last 20 years. My current vessel operates on twin QSB 6.7, 480 HP (3000 RPM) with an Intermittent Duty rating. These are pushing Hamilton Jet 292s. The engines …
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in: Cummins Marine Engines
4 RepliesSeptember 11, 2023 at 8:37 am Here is a better formatted version of our typical tour: 1000 RPMs for 5-10 min 2600-2800 RPMS for 30-45 min 600-1000 RPMs for 10 min 2600-2800 RPMS for 15-30 min 600-1400 RPMs for 45-60 min 2600-2800 RPMS for 30-60 min 1000 RPMS for 5-10 minLast Post by:
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Can any identify this knocking sound
This topic has 13 replies, has 4 voices, and was last updated by
8 months ago August 30, 2023 at 5:36 pm Can anyone identify the knocking sound coming from the 6BT 210 CPL742? I adjusted the valves — did not make any difference. I loosened injectors 1 at a time and none of them made the knocking go away. It is louder on the exhaust manifold side. When idling, sprayed soapy water where the exhaust manifold connects to head and could not find any leaks. I have not tried that under load. CAV pump has 3000 hours since rebuild. Injectors both hav…
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in: Cummins Marine Engines
13 RepliesSeptember 7, 2023 at 6:15 am I just realized ( I think) this this was the engine that br0ke the the rocker pedestal in another threadĀ If so, things makeĀ even less sense now, especially theĀ few 1000-ths less valve clearance seemingly fixing the noiseĀ ?? IMO, engine out, fully inspected,Ā and rebuilt as needed.Ā Wonder what is inside the oil filter?Last Post by:
posted: 8 months ago
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QSC 8.3 Aftercooler Question
This topic has 6 replies, has 3 voices, and was last updated by
8 months ago August 29, 2023 at 4:16 pm I took off my Aftercooler cap on one engine and this rubber washer was on the inside. The cap on the other engine did not have one when I took it off. There was not one of these included in the Aftercooler and Heat Exchanger repair kit (pre-2021) that I ordered from Seaboard so I figured it must not be necessary or critical. But I don’t know. Is this an important component for this Aftercooler? Does it need to be there? It has been running…
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in: Cummins Marine Engines
6 RepliesSeptember 5, 2023 at 12:31 pm You know what I did. I went to a marine service shop that services these types of aftercoolers and they have aĀ pile of aftercooler parts (unbelievable, not very encouraging). They were kind enough to let me scrounge out a couple of pretty good ones from there for free. I buy a lot of stuff there. Not the best solution but at least I didn’t have to purchase another whole expensive repair kit from Cummins just for those. Thats the only way …Last Post by:
posted: 8 months ago
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QSC 8.3 Coupling Bolts
