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- Cummins Marine Forum Topics
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6cta aftercooling Trashed?
This topic has 9 replies, has 7 voices, and was last updated by
2 months ago February 13, 2024 at 8:09 am Hey guys, Im working on serving my aftercooler, after pulling core I found heavy corrosion located on the airside of housing. Looks like the ends and caps do not have as much but my concern is the inside. Attached are pics of all the sides.
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in: Cummins Marine Engines
9 RepliesMarch 2, 2024 at 8:22 am The thin wall PVC tubing was not to be part of the final repair .Ā I was simply an aid in forming a thin smooth layer inside to reduce the amount of sanding later.Ā Also, the same piece once removed can be used as a curved base for the PSA sandpaper toĀ help uniformly sand the curved surface.Ā Think of it as a temporary mold for the epoxy.Ā This epoxy is especially made for this type of purpose – either initial coating for new units as a p…Last Post by:
posted: 2 months ago
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6 CTA Aftercooler housing repair while I wait for a new one…
This topic has 13 replies, has 7 voices, and was last updated by
1 year ago March 29, 2023 at 5:30 pm Took my aftercooler in for testing at Niemic my local Cummins dealer and the core bundle had pinholes and there is pitting in the housing right up to the oring seals. Bought the boat last year, it and the engine are 1998, so time for a new one. Niemic tells me these are out 100 days. So I called Seaboard and the helpful parts guy told me they have the core, but similar bad news on the housing. He also told me that Seaboard is working on its own …
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in: Cummins Marine Engines
13 RepliesApril 8, 2023 at 3:14 am I have used an Italian product called Belzona 1391T for such an issue before with good results.Ā The trick is to blast and clean the surface and have all oils and grease gone.Ā Apply a thin coat with a fine wide artist’s camel hair brush.Ā On curved surfaces like the inside of the AC I like to use something like a piece of the wall from a 4 inch PVC pipe with stick-on PSA sand paper (various grits) to finish it down. The curved backing hel…Last Post by:
posted: 1 year ago
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QSC 8.3 -Do these symptoms suggest clogged fuel injectors
This topic has 15 replies, has 5 voices, and was last updated by
1 year ago
February 10, 2021 at 1:22 pm Thanks in advance for any help on this issue. This forum has been an invaluable resource for a newer Captain like me. I’d love to buy beers to all of you who have helped out. Huge thanks! My boat runs twin QSC 8.3. I have been trying to resolve a boat vibration for the last year, and after a long list of ‘do this first’, am now contemplating injector replacement. I have owned the boat for 3 years. I noticed an advancing vibrati…
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in: Cummins Marine Engines
15 RepliesDecember 7, 2022 at 9:19 am Thanks Tony. I have 540āsLast 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?Ā Thanks in advance.Ā <br /><br /> Mike
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3 RepliesNovember 21, 2022 at 3:36 am I had 2 x turbos have a crackĀ 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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Cummins QSC 8.3 maintenance
This topic has 11 replies, has 7 voices, and was last updated by
July 18, 2018 at 9:57 pm Hello everyone, this is my first time as I’m in the process of buying a new (to me) boat. I have some concerns and they may be unwarranted but I’m seeking advice and information. The boat is a 2008 and has the Cummins QSC 8.3 engines with approx 450 hours on them. I don’t know much about diesel engines but have quickly learned a lot because of this awesome site. I have an offer on the boat that is contingent on everything getti…
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in: Cummins Marine Engines
11 RepliesNovember 16, 2022 at 9:07 am that is somewhat normal on the qsc.Ā I have them as well.Ā just need to make sure you are properly loaded and within the fuel curve.Ā read up about it on this site. they are great engines and super easy to self maintain.Last Post by:
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AirSep Coalescing filter
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago
October 31, 2022 at 8:10 am Good Morning There has to be a way to clean these! $300 to replace seems insane to me especially if youāre Ā racking up yearly hours. Please let me know if anyone had attempted and the results. I can photo document and post if we can come together and get it done Ā Thanks Mike
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1 ReplyOctober 31, 2022 at 1:57 pm The Airsep is a big PITA, you can buy the Envirovent for a little more than a new Walker canister, and never mess with it again. Ā Overfilling the sump can result in blowby symptoms, make sure you have not overfilled it. ĀLast Post by:
posted: 1 year ago
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Tiara 32 open cummins 5.9 SMX display conversion
This topic has 2 replies, has 3 voices, and was last updated by
July 19, 2022 at 6:52 pm anyone try this conversion?Ā
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in: Cummins Marine Engines
2 RepliesSeptember 5, 2022 at 8:33 pm Easy as it gets. Literally plug and play. So much easier to see the data. I donāt get gear data as I used to one the dieselview. I was going to ask Corey what was needed to get the gear data.Ā <br /><br />Last Post by:
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Rattle in Starboard engine
This topic has 1 reply, has 2 voices, and was last updated by
July 17, 2022 at 12:14 pm I went to do my freshwater flush on my twin Cummins Marine 6BTA 5.9 330’s (4788 Bayliner) and upon start up (no fresh water yet and engines still warm) I heard this rattle in the starboard engine.Ā I’ll try to attach a video which pretty clearly has the rattle.Ā Does this sound like a bearing in the transmission or something in the flex plate or something else?Ā Any ideas where I should start in pinpointing the source of this “…
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in: Cummins Marine Engines
1 ReplyJuly 21, 2022 at 8:34 am Report back once you bump the rpm’s.Ā if it goes away its most likely gear rattle.Ā i have it on a previous boat.Last Post by:
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Cummins QSC 8.3 540 ā Heat Exchanger Core Removal
This topic has 1 reply, has 2 voices, and was last updated by
July 17, 2022 at 4:35 pm Finally got around to doing my HX and thought I’d doc in case helps anyone. It’s all pretty easy overall.Ā Close seacock, drain coolant, remove the 2 zincs, remove alternator & bracket (Easy), remove three bolts each end cap, loosen raw water pipe on the afterooler (Raw Water will pour out) that feeds the HX, remove the hose barb that the 1″ hose in front goes into in front of front cap, then you can slide core out for clea…
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in: Cummins Marine Engines
1 ReplyJuly 21, 2022 at 8:31 am thanks.Ā on my list this winter….Last Post by:
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2007 QSC 8.3 do I have to remove raw water pump to change impeller?
This topic has 3 replies, has 4 voices, and was last updated by
May 2, 2022 at 10:23 am It appears the distance from the raw water pump to the electronic control panel is not far enough to get the impeller out of its housing. I have not yet replaced the impellers and want to. Just making sure before I get into it that I do not, or have to remove the raw water pump. Looks like poor engineering regardless. thanksĀ Ā
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in: Cummins Marine Engines
3 RepliesMay 22, 2022 at 9:58 pm Nope. You can get the impeller out without removing the pump or ecmĀ just did 2 thanksĀLast Post by:
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Voltage surge QSC 540ās
This topic has 5 replies, has 3 voices, and was last updated by
May 15, 2022 at 6:57 pm Volts sit constant around 13.2-13.7. I noticed while running at times the volts will spike in the 14-15 range then settle back to the 13.2-13.7 range. Sounds like something is cycling like a heater? Ā Happening on both engines at the same time while running.Ā <br /><br /> any idea on what could be cycling or cause if the spike in voltage? Thanks in advance.Ā <br /><br /> mike
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5 RepliesMay 22, 2022 at 9:55 pm Alternator tested bad. Replaced and all good. Thanks.ĀLast Post by:
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Cummins overheat and prop question
This topic has 1 reply, has 2 voices, and was last updated by
May 22, 2022 at 7:01 pm Hello everyone we are looking at buying a new to us boat home, we’ve lived aboard 9!years and have decided to go to a trawler. It’s a 40′ full displacement tug style wit edeh a 6BTA5-9M2Ā 300hp. My question is I have a sneaking suspicion it was overheated . All of the injectors and fittings near them are rusty and reddish as of the paint was cooked off from high heat. Is this possibly normal on this version? 300 hp?Also the mec…
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in: Cummins Marine Engines
1 ReplyMay 22, 2022 at 9:43 pm Well the HX has not been serviced. That I can see. Ā Can you take more pics from further back so we can see the entire engine bay. Thanks.ĀLast Post by:
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HEAT EXCHANGER looks good or bad?
This topic has 10 replies, has 4 voices, and was last updated by
2 years ago March 18, 2022 at 4:57 pm So I decided to do a full service in my qsc engines. Started as just after coolers, then found a leak in my coolant on heat exchangers so decided to do the same pull and clean process for them. lots of work but well worth it I think. Anyways just want to know how these look to you guys. Iām looking at the cores and am unsure if this like gap in the metal is normal? It looks like itās Mwant to be that way. Also the pipes I am wondering why they l…
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in: Cummins Marine Engines
10 RepliesApril 23, 2022 at 9:54 am If that’s the water divider then the gap is fine. Mine have the same gap.Last Post by:
posted: 2 years ago
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Debris in algae in fuel?
This topic has 5 replies, has 4 voices, and was last updated by
2 years ago
April 13, 2021 at 4:25 pm New to this forum. Have twin VP IPS D6 435 hp engines. Primary racor to the “last chance” engine mounted oem VP fuel filter. Had a rougher cruise back to winter storage in the fall – a bit over an hour run. Had to come off plane for a no wake and then back up on plane and had my stbd engine cut when going up on plane. Limped to the marina at <1500 rpm. Have a racor before the engine mounted filter as the primary filter…
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in: All Other Marine Diesels
5 RepliesApril 13, 2022 at 7:47 am I missed the boatĀ Should have suggested better filtering also. If you add another filter, mud fltr,Ā add the telltale vacuum guages.Ā Ā They will help tip you off to the filters gathering stuff rather than waiting for a power loss or shutdown.Ā Ā The telltales will tip you off even without watching as the one needle will stay at the highest reading untillĀ YOU reset it. Ā Check Seaboard’s listings.Last Post by:
posted: 2 years ago
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New Diesel Engine owner (sorry, it's a yanmar)
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This topic has 126 replies, has 6 voices, and was last updated by
2 years ago April 29, 2017 at 5:55 am I just wanted to greet everyone. I just bought my first Diesel. An Albin 28 2005 model flush deck powered with a 315 yanmar. I wish I could have gotten a cummins B series, but that just isn’t available in the flush deck design I wanted. That said, I will be reading and researching as much as possible to keep this engine working well for as long as possible. It is the original engine, and had about 900 hours on it. It was in fresh water mos…
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in: General Discussion
March 3, 2022 at 5:34 am Hi all ā Long post warningā¦ š Just wanted to document what modifications I have done so far with my exhaust. I am a novice, and learning, so critical comments are welcome. I removed the exhaust elbows off the engine and inspected the turbo. It looked similar to my previous inspection in late 2017, with some rust present, but the flan blades and such still looked in good shape. Of more concern was the unevenness where the elbow bolts onto. I did …
126 Replies
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posted: 2 years ago
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QSC 500 Aftercooler Service
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This topic has 24 replies, has 6 voices, and was last updated by
2 years ago January 15, 2022 at 1:20 pm Started on the aftercooler service today in conjunction with the raw water pump leaks from a previous post. Attached are pictures of the upstream side of the FUEL/OIL cooler, and the aftercooler core. The aftercoolers were last serviced in January 2018 by a reputable Cummins mechanic but I don’t think the FUEL/OIL cooler was serviced. Question 1: The lower bolt on the downstream FUEL/OIL cooler was damaged and I’m having a tough time…
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in: Cummins Marine Engines
February 4, 2022 at 9:19 am After reading through the forum material again, I realized I’d missed the step of dressing the aftercooler housing with 150 grit sandpaper. I finished doing that this morning and wonder if anyone has any observations on the condition of these housings. I have the aluminum rings from Seaboard headed this way and once here will be reassembling and reinstalling these. Don’t want to have anything go wrong at this point. Thanks. 24 Replies
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posted: 2 years ago
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Oil Mist
This topic has 6 replies, has 3 voices, and was last updated by
November 17, 2021 at 5:52 pm I am seeing an oil misting coming out of the black disk housing after the air filter. What is this coming from and what is the remedy? I have a diagram pic but do not see how to post it.
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in: Cummins Marine Engines
6 RepliesJanuary 5, 2022 at 5:45 am How do you send private messages from this forum? Ā Didnāt know this was an option. Thanks.ĀLast Post by:
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2007 QSC 8.3 slow start up
This topic has 3 replies, has 3 voices, and was last updated by
December 20, 2021 at 1:35 pm 2200 hours on both motors. Port side takes an extra 7 to 10 seconds to start and runs a little rough for about 10 seconds. it also runs a few degrees hotter than the starboard side. Both motors idle around 800 RPM. Not sure if that is high or normal. Any ideas where to look to correct the hard to start issue? Starboard motor starts and runs great.
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3 RepliesDecember 21, 2021 at 5:41 pm Idle should be 600 rpmLast Post by:
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QSC 540 expansion tank bubbles with video
This topic has 2 replies, has 3 voices, and was last updated by
2 years ago
December 18, 2021 at 2:00 pm To further a previous postā¦ Ran the boat in our annual Xmas parade. Boat ran fine an most of the night was spent at idle or under 1000 rpm. Upon return I found coolant leaking into the bilge from the coolant in pipe to HX after thermostat. The plastic overflow tank was full upon return and some of the coolant returned to the engine once cooled. I figured it was the leak that caused the plastic tank to fill. I fixed the leak by draining down …
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2 RepliesDecember 19, 2021 at 5:34 am We have a QSC500 and FWIW I can confirm that it takes quite a few engine hours after a coolant change before the level settles. Last time we did this I was actually about to take the turbo off as I suspected loosing coolant through the infamous exhaust to turbo gasket…when the “loss” of coolant finally stopped. However your initial problem seems more to have to do with building pressure in the cooling system. No experience with…Last Post by:
posted: 2 years ago
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Coolant expansion tank overflow QSC
This topic has 5 replies, has 4 voices, and was last updated by
December 12, 2021 at 1:49 pm Last night during our annual holiday parade I noticed my coolant expansion bottle was full and overflowing into the bilge. Boat was only run at 1000 rpm or less and temp never got over 165. Have never had this happen. Any ideas and where to start for correcting the issue. Never had an overheat. 1800 flawless hours. Thanks Mike
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5 RepliesDecember 18, 2021 at 6:55 pm JMO but when I have work to do on the coolant side I drain all of it. That way no surprises. Depending upon the engine and installation you may still have a small quantity escape. Actually I do the same on the raw water side although that is not quite as clear cut.Last Post by:
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6cta aftercooling Trashed?
