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- Cummins Marine Forum Topics
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Motor temp – 450 CTA 8.3
This topic has 5 replies, has 5 voices, and was last updated by
10 months ago
July 10, 2019 at 2:34 pm Iām new to diesels , notably the 450C. Purchased and sea trialed the boat (sea Ray 420 DB) in Dec. At the sea trial and engine survey the motors ran in the mid 170ās at cruise and 160-162 at idle. Now As I compare to other 450 C they seem to run about 160 at idle and at cruise. Fast forward 7 months both motors run 175-180F. At cruise Could it be that I have 180 thermostats? Nothing was noted as out of the ordinary with temps at survey and they …
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in: Cummins Marine Engines
5 RepliesJuly 11, 2023 at 2:18 pm Old topic but figured it may be better than starting a new thread. 6CTA’s I did my aftercoolers last winter and was running at 160 on both at cruise. One was horrible corroded ended up getting a new one from you guys.Ā Only at WOT would they go to 170ish. A few days ago my gauge was spiking to 180 for a split second and then dropping back down. Almost looked like a gauge electrical issue because of the speed of the up and down. Then I star…Last Post by:
posted: 10 months ago
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6cta engine survey
This topic has 4 replies, has 3 voices, and was last updated by
1 year ago November 11, 2022 at 10:33 am New to the site and have been looking around and see some great things, there is nothing better then having a great forum group to learn more. I’m getting close to signing a purchase agreement on a boat with a 1996 Cummings 6cta 450hp diesel with 3200 hours. Having owned a few boat in the past with 4 stroke outboards, I’m new to the diesel marine engines and honestly do not know where to start as far as looking for visual potential p…
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in: Cummins Marine Engines
4 RepliesNovember 11, 2022 at 12:00 pm Here are a couple pics of engineĀLast Post by:
posted: 1 year ago
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Rag went through the engine
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This topic has 23 replies, has 9 voices, and was last updated by
1 year ago
September 9, 2022 at 6:10 am Hi All,Ā Ā Boat is a ’99 Searay 450 express bridge with twin 6CTA’s with 2,400 hours. They are v-drives. Due to shaft alignment issues, I bought 8 new motor mounts from SBMar and paid a mechanic to install them.Ā In that process, the SW pumps had to be removed.Ā On the strb side, SW pump is outboard.Ā The motor mount under the SW pumps had to be cut out, so SW pump was removed.Ā They shoved a rag in the SW pump hole to keep debris fro…
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in: Cummins Marine Engines
October 10, 2022 at 8:16 am Dan, I did, and that hose is less than a year old.Ā Then I disconnected both intake hoses from the pump, then opened both engine’s seacocks to check water flow into the boat.Ā Both were equal.Ā Also, obviously I cleaned out the sea strainer and through hull. However, I am thinking about replacing that intake hose.Ā As mentioned above, they had to used grinders to remove the motor mounts.Ā I’m wondering is some of the hot sparks from …
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Fuel Additive/Fuel Tank Polishing
This topic has 4 replies, has 4 voices, and was last updated by
2 years ago April 4, 2022 at 8:25 pm Just did my annual maintenance and my 10 micron filters were BLACK.Ā Obviously I’ve got some algae in the tank.Ā Any recommendations on an additive?Ā A biocide like Bioguard? Anyone ever do the fuel polishing?Ā I’m assuming they just run the fuel through a filter and not really clean the tank.Ā Any thoughts would be appreciated.Ā
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in: Cummins Marine Engines
4 RepliesApril 13, 2022 at 8:31 pm Years ago, I had a Riviera 43 (99 model) and set up a fuel polishing system as per the attached photo.Ā Basically two 3-way valves and a circulating pump.Ā Also, I once had the opportunity to see inside the fuel tank of a 43 (someone else had cut one open to make it larger) and I noticed the fuel supply came from the forward bottom of the tank and the fuel returns had internal pipes leading from the forward top of the tank to the aft of the tank…Last Post by:
posted: 2 years ago
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6CTA 450hp Diamond runs hot
This topic has 7 replies, has 5 voices, and was last updated by
2 years ago August 9, 2021 at 1:40 pm Twin engine, 2001 38′ Tiara open approx 1600hrs. Purchased boat 9/2019 with 1400+/- hours. All temps & readings good. Now intermittent running a bit warm. On a short run (25-30min) in the bay with some no wake zones all temps good 180-185degrees. On a bit longer run (40+min) at 2100rpm temps begin to creep to approx 200degrees & alarm starts to buzz, if I back off to 1900-1950 rpm no more buzzer, temps return to 185degrees. Stra…
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in: Cummins Marine Engines
7 RepliesAugust 10, 2021 at 6:38 pm AFTERCOOLERS—————–NOT Heat exchangers Cummins Marine Aftercooler Maintenance Cummins Marine Aftercooler MaintenanceLast Post by:
posted: 2 years ago
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6CTA 8.3
This topic has 5 replies, has 3 voices, and was last updated by
2 years ago
August 2, 2021 at 9:22 am Hello. Looking at a new boat with 6CTA. Been researching on this website but looking for advice. (I have a 5.9 6bta, not familiar with 6CTA). Looking on Quickserve some numbers donāt match. Concerned about valve/valve seat. Any help appreciated. SN 46353945 Cpl 8089 Thanks in advance Brian
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in: General Discussion
5 RepliesAugust 3, 2021 at 5:35 pm I have the same motors. Treat them well and they’ll out live you. Arguably the best mechanical motors Cummins has made. I lost a transmission because my Hynautics we’re slipping but solved the problem with new Glendinning electronic controls. Good luck.Last Post by:
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Airsep Breather Kit
This topic has 2 replies, has 2 voices, and was last updated by
June 26, 2021 at 1:34 pm Have put about 20 hours on the motors (6CTA) since the breather kits were installed and only noticing a very small amount of oil in the jugs. Essentially the same amount on both engines. I’m told this is completely normal but wanted to run it by the forum. Thanks.
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2 RepliesJune 26, 2021 at 4:00 pm Iāll be back at the boat in a few days Tony and will get them uploaded.Last Post by:
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Blow By in 1993 Cummins 400 HP 6C 8.3 TA
This topic has 3 replies, has 3 voices, and was last updated by
June 8, 2021 at 4:58 am I am under contract to purchase a 1994 Tiara 4000 Express with 1250 hours on the engines. As part of my due diligence I received copies of invoices for two recent service/repair jobs that were paid by the owner of the boat. The first one (October 2020) was for doing a 1,000 hour service in which included changing the fluids and cleaning the aftercoolers and heat exchangers for a total of $7393.00. The second service (January 2021) was done becau…
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in: Cummins Marine Engines
3 RepliesJune 8, 2021 at 10:24 am It’s interesting that the company that did the work on the motor told you it would need “major” work. You’d think they would have fixed it the first time? And i have the same motors and have Airsep breather kits and never had an issue at all. Good luck.Last Post by:
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Air Sep Breather Kit
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3 years ago May 3, 2021 at 9:23 am A friend of mine with the same engines as me said he needs an Air Sep Breather kit. Can someone explain what that is and why it would be needed? Thanks!!
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1 ReplyMay 3, 2021 at 5:57 pm Type “Walker Airsep” in GOOGLE and read away……………….. Then go into “Tony’s Tips” and read my politics on CCV’s, when it comes to Cummins marine engines. Then, research some more.. ..Last Post by:
posted: 3 years ago
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oil in blige
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This topic has 23 replies, has 5 voices, and was last updated by
3 years ago
April 12, 2021 at 8:02 am So after getting both shaft seals replaced and driving back from the shop all was good. Started boat up a week later and all seemed good. Today I went to start up and at same time lifted hatch. I see my aft part of bilge black with oil. I noticed also it had bilged out some oil. I immediately stopped engine. I checked the oil and it is a little low but not a lot. I have spent 15k in winter time repairs that were needed. Any idea on where…
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in: Cummins Marine Engines
April 15, 2021 at 2:29 pm Yea my fault not mentioning that. When I felt the slack I was kind of pissed because I have paid the company 15k for everything they have done. New Aftercoolers and a bunch of other work. But this pump and belt was the latest work they did. Pure laziness not to take out that part and clean it up. The tension bolt I could not get to work. It was rusted up as was that whole part. i took it out cleaned it up and replaced it and tightened it … 23 Replies
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coolant loss over run time
This topic has 3 replies, has 2 voices, and was last updated by
April 13, 2021 at 6:02 am Hello all and Tony, i have a similar situation after several hours of running i lose all my coolant in the reservoir tank. the engine is a 1999 5.9BTA 370hp and was rebuilt 38 hours ago. I have no leaks in the engine room and all hoses and connections are new and fine. Im lost on what to look at, the heads and block are new and the engine never got overheated. Any ideas
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in: Cummins Marine Engines
3 RepliesApril 14, 2021 at 1:13 pm I’m not an expert by any stretch so hopefully someone who’s a hell of a lot smarter than me will chime in but IF coolant is coming out of your exhaust it means you might have a bad gasket seal between the cooling system and the intake/exhaust manifold, or the cylinder head/cylinder wall. If you open you coolant cap and smell exhaust that’s usually a sign of a blown gasket.Last Post by:
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New purchase
This topic has 4 replies, has 4 voices, and was last updated by
3 years ago
March 31, 2021 at 4:51 pm Just had a on land survey done today on a 2005 sea ray 42 sedan bridge with Cummins 450 diamond series, next week will be the sea trail I was wondering if I should hire an engine surveyor. Current owner purchased the boat at the end of 2018 and had the engines checked by Cummins I have a copy of the report. since then only 50 hours have been put on the boat and they had a Cummins dealer perform the ā1000 service ā . < See below invoice and p…
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in: Cummins Marine Engines
4 RepliesMarch 31, 2021 at 6:29 pm No reason not to. Nothing bad can come from it. Can’t hurt. Etc. Etc. Don’t let the broker, owner, etc. find you the surveyor. Find them yourself. Congrats and good luck.Last Post by:
posted: 3 years ago
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Cummins 6CTA8.3-M4-465 (CPL 2960 480CE engines) – infamous dropped valve
This topic has 7 replies, has 6 voices, and was last updated by
3 years ago March 9, 2021 at 12:28 pm I am purchasing a 420 Sedan Bridge with twin Cummins 6CTA8.3-M4-465 (CPL 2960 480CE engines) One engine already suffered the infamous dropped valve. It was repaired and the head was upgraded with different springs. The other engine also had the head springs upgraded. Does this upgrade make them bullet proof or should the prop sizing and fuel consumption still be the guideline?
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in: Cummins Marine Engines
7 RepliesMarch 11, 2021 at 4:56 am Get those tachs checked for accuracy (or inaccuracy).Last Post by:
posted: 3 years ago
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6bt 210 x2 – one engine getting warm
This topic has 6 replies, has 5 voices, and was last updated by
3 years ago
March 8, 2021 at 7:20 pm hi guys my first post of hopefully many š I have a riviera 34ft with twin 6bt’s (210hp) – the boat is newish to me and i am in the process of going through it front to back. When i bought it the starboard engine would run warmer than port (noting port also runs the hot water service) at 2300rpm and above, my concern that it would run warmer but also gradually increase so i would back off to prevent overheating- At 2300 and above star…
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in: Cummins Marine Engines
6 RepliesMarch 10, 2021 at 5:04 pm Hi Tony thanks for the reply, the seawater pumps were replaced with new units (not cheap here in Australia!) in November 2020, since then they have done ~10-15 hours work. The thermostats were not replaced but were checked at the time and was advised they did not need replacement – for what they cost it may be worth putting a new one in starboard cheersLast Post by:
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No Seawater strainer?
This topic has 7 replies, has 5 voices, and was last updated by
February 23, 2021 at 7:35 pm 2001 QSM11’s on a 42 convertible and I noticed today (pre-purchase) that there are no sea water strainers on the raw water system. This “feels” like a bad design, but i’d like to believe there was good rationale by the boat builder when built. Should I move adding strainers to the top of my must-do list if survey is successful? Picture on next post.
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in: General Discussion
7 RepliesFebruary 25, 2021 at 4:56 pm I took my strainers out altogether, Riviera had a bad design to begin with, and opted for the design you’re referencing. Never had a problem.Last Post by:
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160 Degree Thermostats
This topic has 13 replies, has 4 voices, and was last updated by
3 years ago January 8, 2021 at 6:45 pm Probably a stupid question but here it goes….had my mechanic put in 160 degree thermostats for my 6CTA’s. So obviously when running the boat that’s where they stay. So my question is how would I know if the engine is overheating? Assuming if there was an issue my gauges would reflect a problem? Or my alarm I guess?
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13 RepliesFebruary 13, 2021 at 8:19 pm Rereading the original post I do now see where you are coming from. Interesting. I never read it that way. Either way heās got some good feedback from all to help him sort through his questions .. Thanks.Last Post by:
posted: 3 years ago
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2000 6CTA Aftercooler Service
This topic has 3 replies, has 3 voices, and was last updated by
3 years ago January 21, 2021 at 3:50 pm Hello – Performed my first aftercooler maintenance today – the aftercooler was purchased from Seaboard two years ago and the boat has been mostly in fresh water. I noticed water on the air side in the pipe coming from the turbo and upon disassembly I found the fins wet. As noted on the site the turbo side was black. Is this normal condensation from the hot turbo air or do I need to investigate the source of the water. I have sbm…
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in: Cummins Marine Engines
3 RepliesJanuary 22, 2021 at 5:52 pm Because of what they “looked like”.. I’ve seen New aftercoolers look worse because they were assembled DRY at the factory..Last Post by:
posted: 3 years ago
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Raw Water pump
This topic has 5 replies, has 3 voices, and was last updated by
January 19, 2021 at 3:23 pm Recently had a lot of work done on my engines that were needed. First time ever to change after coolers which lasted 14 years. They changed one of the raw water pumps as the belt had shredded. I thought at the time I should get the other changed but I had spent so much money at the time I passed. I did the work I could do but a lot I could not. I watched them change the water pump so may be able to do it. So I started the boat up today sinc…
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5 RepliesJanuary 19, 2021 at 7:02 pm I have to pull off the black cover and look again in the morning. But I beileve it is like the one on the right. I have a QSB 5.9 330 HP cummins. When I pull the black plastic cover off all i see is a belt like the one on the picture on the right. And it is not moving at all when my engine is running. Which is why i am assuming the pump is dead I guess i will call the cummins people out. The last time they charged me 900 for the pump and…Last Post by:
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Oil change interval low use 6CTA
This topic has 2 replies, has 3 voices, and was last updated by
3 years ago
January 10, 2021 at 7:33 pm I have a pair of 6CTA’s in a 2005 Searay. Engines have 944 hours on them. The boat had about 700 hours when I bought it about 3 years ago. I am putting 90-100 hours per year on it, mainly in short runs. The service manual specifies 250 hours between oil changes, but I am thinking that my low usage, with the boat sitting a lot and not having many long runs, may mean that I should change the oil more often. Is this correct, or am I good…
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in: Cummins Marine Engines
2 RepliesJanuary 10, 2021 at 10:12 pm Chevy vs MaseratiLast Post by:
posted: 3 years ago
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6CTA Coolant Question
This topic has 10 replies, has 5 voices, and was last updated by
January 5, 2021 at 3:40 pm Question, I have 6CTAās. Iāve noticed that after some trips my coolant expansion/overflow tanks are normal level. A week or two later when I come back they are almost empty and always have to put a cup or two in them before I head out again. Boat runs great, put in 160 thermostats, No leaks as far as I can see in the diapers, donāt see anything in the exhaust, and coolant checks are always full. Plan on doing a pressure test in the coming we…
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10 RepliesJanuary 10, 2021 at 12:36 pm I have diapers everywhere and nothing. My guess is the HXR’s.Last Post by:
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Motor temp – 450 CTA 8.3
