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- Cummins Marine Forum Topics
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Water heater loop cap-off?
This topic has 3 replies, has 4 voices, and was last updated by
11 months ago
June 1, 2023 at 6:48 am I have a domestic hot water heater with a heat exchanger loop connected to my QSB 8.3.Ā The water tank is leaking; I have to remove the water tank to send it for a warranty claim.Ā Therefore, I won’t have a water heater for a while and need to rig the engine to run.Ā Ā <br /><br />My question is:Ā how should I handle the coolant loop hoses out of the engine? Option 1:Ā Cap off the input and output hoses for the coolant loop.Ā Op…
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in: General Discussion
3 RepliesJune 20, 2023 at 3:06 pm Just bought a maxum 4600 with twin 8.3s.Ā Ā Rusted out water heater had the coolant lines barbed together. I installed a new heater and reconnected the water and coolant lines.Ā When you pull the barb, coolant will want to drain all over the space.Ā It is not under pressure so doesn’t take much to stop.Ā I put the heater in place, attached the water lines, made sure I had clamps ready to go, and I pulled the barb and put both lines on their…Last Post by:
posted: 11 months ago
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Cummins QSC 8.3 runs rough at idle speed in gear, clears above idle.
This topic has 10 replies, has 6 voices, and was last updated by
1 year ago September 1, 2022 at 12:23 pm My 2014 Back Cove 37 single QSC 8.3-600 HO with 458 hours runs very rough when in gear at idle speed, enough to cause the boat interior to shake. Ā Advancing the throttle slightly stops the problem. Here are some particulars: When started (ZF 286A 0.91 gear not engaged), the engine idles smoothly @600 rpm. Ā Varying engine speed while in Warm Mode is also smooth with no sign of rough operation. Ā When the ZF is engaged, the engine speed remains st…
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in: Cummins Marine Engines
10 RepliesApril 30, 2023 at 6:04 pm Linear vibration (when your instruments hanging from the ceiling vibrate ,your boat rails move,Ā or you “feel it” on the back deck or in the seat of your pants) is totally different from “gear rattle” which can be very annoying sound wise. Gear rattle is typically related to a worn out torsional coupling or mis-match at lower /idle RPM’s and goes typically away when the RPM is raised a tad,.Ā I guess some boats coul…Last Post by:
posted: 1 year ago
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Post-pump FW flush QSC 8.3
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago February 14, 2023 at 12:50 pm I have a QSC 8.3 600 and am considering a different FW flush arrangement. Ā I currently am using a flush cap, but I think leaving the sea cock open when flushing is not as effective as I would like. Iād like some advice if what Iām thinking is feasible.Ā <br /><br /> Iām considering cutting the stainless tube between the raw water pump and the oil/fuel cooler and inserting a bronze tee adapter with a flush valve. Ā The tee adapter woul…
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in: General Discussion
2 RepliesFebruary 19, 2023 at 10:19 am I’ve read the SB article and watched the video on the subject.Ā Based on those materials, its not accurate that Tony “does not like what I’m suggesting”.Ā Ā <br /><br />Both the article and the video state that a post-pump flush setup is an acceptable option, so long as the exhaust has a natural gravity drain through a straight, non-lift muffler.Ā The caveat is that this won’t flush the strainer or pump.Ā Ā …Last Post by:
posted: 1 year ago
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Wolverines
This topic has 14 replies, has 7 voices, and was last updated by
1 year ago June 29, 2022 at 1:31 pm Love my wolverines but after a year and a half it seems one has failed.Doesnāt seem like there is any trouble shooting to do as basically there is just a plug and a pad.Anybody have to take one off and replace. Seems like a pain to remove.I was hoping for more than a year and a half.outlet is fine.Bill
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in: General Discussion
14 RepliesOctober 20, 2022 at 3:18 pm Tjborro I found those on Amazon. I was considering them also but the reviews werenāt great.About 100 bucks each.One reviewer said he got about a year and a half on his in the marine environment.But if you read all the reviews itās hard to buy anything.They would seem to be a perfect solution if they last.Let us know.BillLast Post by:
posted: 1 year ago
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QSC air filter wonāt resemble
This topic has 3 replies, has 3 voices, and was last updated by
1 year ago October 9, 2022 at 7:04 am I have a QSC 600 with the standard walker airsep filter. Ā Recently I removed the filter element and silencer lid for inspection and maintenance. The silencer was a bit hard to get off. Ā Normally it pops right off.Ā When reassembling, the silencer lid will not fully insert and seat into the housing. Ā There is a good 3/8-1/2ā gap that prevents the v-band clamp from locking. Iāve tried pressing hard, wiggling, rotating. Ā Itās almost like the housin…
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in: Cummins Marine Engines
3 RepliesOctober 14, 2022 at 4:49 pm I got it sorted. Ā The o-ring was I the wrong position. When the lid was removed, the smaller o-ring was on the smaller shaft of the lid. Ā It LOOKS like it should fit at the base of the lid. Ā It actually belongs on outer lip of the lid receiver. Reinstalled it and all fit properly. Ā ĀLast Post by:
posted: 1 year ago
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Strainer Flush Fitting Questions
This topic has 10 replies, has 6 voices, and was last updated by
2 years ago
April 5, 2022 at 12:55 pm My set up: twin QSB6.7 380 with SB flush fittings mounted to engine intake strainers. Sherwood pump P2708 w/ 27000K impeller. Flush fittings just installed. To be tested shortly. I have watched the SeaBoard video on ‘How to Perform an Engine Flush’ and have a question regarding the recommended method of leaving the seacock open and running fresh water into the strainer with engine running. The video states that I will get 80-85% fres…
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in: General Discussion
10 RepliesApril 24, 2022 at 6:24 pm Simple test of dock water supply is to start the motor and watch the hose. Ā Ā Ā Ā Ā <br />If it collapses, your supply is probably marginal, but if the hose stays round, youāre good to go.Last Post by:
posted: 2 years ago
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What is this filter?
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago March 14, 2022 at 10:06 am Found this filter in the spares left by the previous owner. Ā Doesnāt seem to fit any of my gear which includes a QSC 600 and a Cummins Onan 9lw generator. Ā <br /><br /> Any idea what it would be for? The top is pretty rusted so I wouldnāt want to use it anyway. Ā Is model FS19526.Ā <br /><br />
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2 RepliesMarch 26, 2022 at 12:20 pm Thanks. Ā Seems like a random piece of gear. Ā I tossed it, just wondered what it would be used on. ĀLast Post by:
posted: 2 years ago
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Fresh water flush and pencil zincs
This topic has 4 replies, has 3 voices, and was last updated by
2 years ago December 6, 2021 at 1:38 pm Quick question… As an adherent to Tony’s fresh water flush regime on our 6BTA… What effect, good or bad, does this have on the three pencil zincs in the engine cooling system. It appears the bottom zinc in the aftercooler is the only one that sits in water when the engine is off. Thanks much… John
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in: Cummins Marine Engines
4 RepliesDecember 7, 2021 at 6:05 pm I operate in salt water, and proactively fresh flush, engines off. Pencils last longer for sure, however, are still doing their job for the hours the engines are run. Pic of one of my aftercooler’s end caps attached. Pick which one lays in fresh water The bottom aftercooler cap (the brown tinged), immersed zinc was fairing a little better, however, not so good that it would go say, another year. I easily got 3 years from my pencils but you…Last Post by:
posted: 2 years ago
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QSC 8.3 Turbo soot, aftercooler cap grease leak
This topic has 4 replies, has 3 voices, and was last updated by
3 years ago
April 29, 2021 at 7:18 am I have a new-to-me 2019 Back Cove 37 with a QSC 8.3 600 engine. 157 hours. Recently picked it up in Charlestown, SC and drove it 981 miles up the ICW to Long Island. Pleased to say the fuel burn was a spot-on match to the Cummins fuel demand chart. Checking things out post-trip, I noticed 2 things I’d like to understand: 1) There is some sooty-type material on the turbo near the wastegate. There is what looks like a heat shield over…
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in: General Discussion
4 RepliesMay 3, 2021 at 3:29 pm I wouldn’t wait to do the AC, though very unlikely there’s any issue but it’s a relatively easy item to do given all that room and a small price to pay to get the peace of mind. There’s no grease or other lubricants in that area, other than what was used to assemble the AC when new. Maybe, possibly, being pushed out due to some beginning corrosion taking place, but being so new, unlikely in a terrible state at all. Get it…Last Post by:
posted: 3 years ago
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Cost of RE powering a 41ā Back Cove
This topic has 6 replies, has 6 voices, and was last updated by
3 years ago January 17, 2021 at 1:56 pm I am looking to purchase a 2017 41ā Back Cove unfortunately it has the 600hp Cummins ( grossly underpowered) the other option is the QSM-11 715hp . Which has the Exhaust Manifold issue ! What would be a good substitute HP reliability, and mounting consideration for a ā swap out ā and the approximate cost involved . Thanks Elliot
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in: Cummins Marine Engines
6 RepliesJanuary 19, 2021 at 5:08 pm Yes , I was thinking Sabre. Stand corrected.Last Post by:
posted: 3 years ago
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MAN Marine Good/ Bad?
This topic has 2 replies, has 3 voices, and was last updated by
3 years ago January 10, 2021 at 1:14 pm Looking at a boat that has twin 1050 HP Man Marine. I have been trying to stick with Cummins but id is a nice boat. My uneducated guess would be that parts and finding a service guy would be more expensive but are they reliable?
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in: General Discussion
2 RepliesJanuary 11, 2021 at 8:15 am My understanding from reading posts of a guy who owns a pair in a Sea Ray is that having a good tech is really important. He has what he refers to as his “Man-man”. He seems to like his engines very much, but are expensive to maintain. This both from parts and from service. The service network seems to be pretty thin, so I’d think it would be important to find out who can service them and if they have a good reputation.Last Post by:
posted: 3 years ago
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Why does my diesel boat have bilge blowers?
This topic has 6 replies, has 6 voices, and was last updated by
3 years ago January 7, 2021 at 10:21 pm My Cummins powered Meridian has 2 bilge blowers in between the engine room and lazarette on the stbd side. They are failing. Why are these used on a diesel boat, and when should I use them? (Iām fully aware of the reason and usage for gas boats). Is it for engine room cooling? While running or back at the dock?
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in: Cummins Marine Engines
6 RepliesJanuary 10, 2021 at 7:37 am Underway during a looooong no wake zone when heading back to the slip and then continued after engine shutdown.Last Post by:
posted: 3 years ago
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Questions About Discoloration of Aftercooler/Turbo
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This topic has 21 replies, has 10 voices, and was last updated by
3 years ago November 29, 2020 at 9:48 am I am new to the forum and new to diesel engines. Let me start by saying what a great resource this is. I am currently in the market for a Sea Ray 460 Sundancer between the years 1999 and 2004, and am just starting to look at some different boats. Most of the boats I have seen have either the 450 Diamond Star or 480 CE engines depending on the year. I have been doing research on the forum about discoloration of the aftercoolers/turbo as a sign th…
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in: Cummins Marine Engines
January 2, 2021 at 8:47 pm Harry Karaoglanian wrote: For a new boat or a new used boat? Haha. My broker keeps telling me thereās no way they would add that to a policy for a 2001/2002. Maybe I need to find a new brokerā¦ā¦ Used. But itās a 2019 model.
21 Replies
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posted: 3 years ago
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QSC 8.3 600 coolant overflow bottle level
This topic has 2 replies, has 3 voices, and was last updated by
November 11, 2020 at 2:29 pm What should be the normal level on a coolant overflow bottle for a QSC 8.3 600? I took a test ride on a boat recently. After the run and checking the engine space, I observed the plastic remote overflow bottle mounted on the bulkhead was empty. The engine was still hot so I didn’t want to open the coolant cap and check the level. There was also a few drips of oil coming from under the crankcase cover gasket after a run. The run for …
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in: General Discussion
2 RepliesNovember 11, 2020 at 6:41 pm That grease has most likely has been there since new and a good thing. Is it greenish? Regardless, if you buy it, first thing you should do is to service them as well replace all the zincs, etc. Drips of oil is not normal but may not be a huge issue to fix either. Needs to be investigated though. No coolant in overflow bottle not desirable as there really should be some in there, as Tony mentions. Good luck.Last Post by:
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QSC 8.3 600 vs. Volvo D8 600
This topic has 6 replies, has 5 voices, and was last updated by
3 years ago
October 22, 2020 at 7:03 am I’m looking at a boat that has the option of 2 engine packages: a Cummins QSB 8.6 600hp, or a Volvo D8 600hp. Any thoughts on the differences between these packages in terms of overall performance, service requirements, longevity, and ease of owner-performed maintenance? I’m somewhat familiar with Cummins from having owned and worked on a QSB 6.7 480. The Volvo is new to me so I have no reference. Unfortunately I can’t co…
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6 RepliesOctober 23, 2020 at 1:50 am I believe the Cummins engine you are referencing is the QSC 8.3 600. I will not be able to offer a ātechnicalā reply comparing the Cummins vs Volvo. while Volvo Penta engines excel with their unique marine torque. High torque at low rpm gives rapid acceleration to the plane and massive maneuvering power fishing equipment stores in dubai. Even at high load and high rpm, the torque remains strong to provide efficient cruising speed in all conditio…Last Post by:
posted: 3 years ago
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Starting my freshwater flush setup
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This topic has 28 replies, has 10 voices, and was last updated by
3 years ago April 2, 2020 at 4:27 pm Starting my fwf finally after talking about it for too long. My system is ok for an engine off system and will tap into the OUT port on my seawater pump. Manifold is all Home Depot stuff and will be installed in my transom locker with a quick disconnect for the dockside garden hose. I used 3/4ā braided hose from Amazon to run to my engines, and it will reduce down to 5/8ā hose and then into the 1/4ā NPT fitting on the pump. The goal is …
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September 29, 2020 at 11:34 am Thanks Rob for the quick reply. 28 Replies
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posted: 3 years ago
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Fault diagnostics
This topic has 11 replies, has 5 voices, and was last updated by
3 years ago July 1, 2020 at 2:51 pm My boat has twin qsb 380 With mercury Smartcraft Getting a check engine message ā troll control not availableā What is the best diagnostic computer?
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in: Cummins Marine Engines
11 RepliesAugust 18, 2020 at 10:16 am Try page 15…Last Post by:
posted: 3 years ago
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Aftercooler cap bolt broke
This topic has 5 replies, has 5 voices, and was last updated by
4 years ago
April 6, 2020 at 7:50 am Reinstalled the bronze aftercooler caps after servicing the my QSB 6.7 480 aftercooler and using plenty of Alco Metalube. Per the user manual I used a a torque wrench set to 33 ft lbs. A number of the bolts kept turning and didn’t hit the spec’d torque value. I felt one of them pop. Luckily it was only partially broken and the entire bolt came out easily. The bolt was deformed and stretched. It immediately snapped in half in my…
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in: General Discussion
5 RepliesApril 7, 2020 at 5:02 pm Those same bolts could be used in cast iron or steel, where the 33 ft-lb spec would be close to appropriate. I would check the calibration of the torque wrench. It sounds like a lot more torque may have been applied. I recently did the whole aftercooler thing on my QSB5.9. I used the spec in the Cummins manual (32 ft-lb) with no difficulty at all. I have done a bit of “wrenching” in my time, and this felt fairly tight, but not ridicu…Last Post by:
posted: 4 years ago
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QAB 6.7 Aftercooler servicing
This topic has 1 reply, has 1 voices, and was last updated by
4 years ago March 15, 2020 at 3:03 pm I started to take apart the aftercooler in my QSB 6.7 480 for servicing. I shredded an impeller and knew I needed to clean it out. This is my first foray into aftercoolers and Ihave some questions. – There is a rubber strip on the inside of each of the end caps. Upon disassembly the neither strip was attached to the cap, and they are both too long to fit back into the rib. Is this normal? – Can the core be removed from the ho…
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1 ReplyMarch 16, 2020 at 6:09 am Sorry, I mis-labeled. That’s not the exhaust tube; it’s the air crossover tube from the bottom of the turbo that feeds intake air to the aftercooler. Anyway, I do need to replace the o-ring since it was disassembled? The manuals I’ve looked at on QuickServer aren’t clear on this point and I can’t find a part number for the o-ring either.Last Post by:
posted: 4 years ago
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Engine flush fittings.
This topic has 10 replies, has 7 voices, and was last updated by
4 years ago
August 16, 2019 at 8:10 am I see Seaboard has bronze in line flush fittings for cummins engines. Is there any more sizes available? I’m looking for different barb end sizes. I have a few boats I work on that I would really like to add the ability to flush easier. Most of the boats are live aboards. 1 1/4 ,1 1/2 1 inch. I probably can cobble something together but those bronze fittings are real nice.
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10 RepliesFebruary 14, 2020 at 1:39 pm For some reason the forum won’t allow me to post direct links Try here http://www.marineeast.com/a_sch/sch_lst.asp?cid=1 and here http://www.marineeast.com/a_sch/sch_det.asp?cid=03&pid=03_02 The banjo fittings are bulletproof this where you looked? http://www.banjovalves.comLast Post by:
posted: 4 years ago
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Water heater loop cap-off?
