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- Cummins Marine Forum Topics
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Picture Request: 6CTA Oil Pump
This topic has 3 replies, has 2 voices, and was last updated by
1 week ago May 7, 2024 at 4:37 am Chasing down a lower oil pressure on port motor – SN#46309849 – 1200 hours. Doing routine maintenance this weekend and also changing out the oil pressure relief valve and was recco’d to do the oil pump as well. Does anyone have a picture of its location? I can’t seem to find a good one online and I have searched for a while. (Forum search function still down).
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in: Cummins Marine Engines
3 RepliesMay 7, 2024 at 5:36 am I guess the REALLY good news is that there is reasonable access to it as well.Last Post by:
posted: 1 week ago
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Aneriod Adjustment?
This topic has 12 replies, has 5 voices, and was last updated by
1 month ago
February 27, 2024 at 7:05 am I have a pair of ’99 6CTA’s with 2,400 hours. I’ve owned the boat for 13 years and these engines have been great. But, on takeoff, the srtb engine shows some black smoke and needs a little more throttle than port to get the turbo to kick in. It has always done this. Once on plane, all good. Just when getting on plane does this happen. I remember a “lazy Aneroid” discussion here, and thought this might be the ca…
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in: Cummins Marine Engines
12 RepliesApril 4, 2024 at 11:01 am Finally figured it. Turbo – leaking oil and sent out to Turbo Dave for new cartridge – result – brought boost up 10 lbs Turbo pipe gasket leaking after rebuild – found that and got a little more boost going where it was supposed to go. Rebuilt fuel pump was in the equation also – after confirming boost was back up, had to adjust the AFC a few more clicks to get it just right. Results – engines spool evenly and…Last Post by:
posted: 1 month ago
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Which Coolant Filter?
This topic has 2 replies, has 2 voices, and was last updated by
2 months ago
February 25, 2024 at 7:11 am Hi All, Engines are 1999 6CTA’s with 2,400 hours. I’m using Fleetguard Compleat coolant. Which coolant filter do I need? Thanks Larry
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2 RepliesFebruary 26, 2024 at 11:25 am Thanks Tony!Last Post by:
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6cta tachs bouncing
This topic has 2 replies, has 3 voices, and was last updated by
3 months ago February 8, 2024 at 2:04 pm right before I winterized I was coming in and my tachs starting bouncing up and down, sometimes they were reading zero, then come back up and just fluctuate. The engines are running perfectly (6CTA-8.3M), I do have a Glendenning synchronizer, people are saying “bad grounds”, well, I cleaned all the ground connections from the battery, and behind the console (its a Tiara 3800). Other folks say metal on the pickups, I ordered two ne…
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in: Cummins Marine Engines
2 RepliesFebruary 8, 2024 at 6:24 pm The symptom you explain is typical the the magnetic pick-up needing to be pulled, the tip cleaned and then re-installed and set properly.Last Post by:
posted: 3 months ago
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6CTA83-M3
This topic has 2 replies, has 3 voices, and was last updated by
November 28, 2023 at 7:18 am Hello…I am buying a Bertram 36 Moppie, equipped with 2 Cummins 6CTA83-M3 (450 hp). Is it possible to know (approximately) the consumption of the engines? thank you in advance
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in: Cummins Marine Engines
2 RepliesNovember 28, 2023 at 2:20 pm Should burn. It could burn a lot more if over propped.Last Post by:
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Different fuel burn rates on twin Cummins QSB 5.9 480hp
This topic has 2 replies, has 3 voices, and was last updated by
October 24, 2023 at 1:17 am Hi there. I recently bought a 2001 Topaz 32 Express in Australia. It has twin 2012 Cummins QSB 5.9 480hp. The boat runs great and been very reliable so far but I notice the starboard motor burns 10% more fuel than port. Could this be a prop or alignment issue or something with the engine? Thanks Rob
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in: Cummins Marine Engines
2 RepliesOctober 25, 2023 at 5:10 am Also to note, the gear ratios in the trans might be different port to strb. One might be running in “reverse” to go forward and the reverse ratio could be slightly different than forward.Last Post by:
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Aftercooler condensation drain install?
This topic has 5 replies, has 3 voices, and was last updated by
7 months ago September 21, 2023 at 10:19 pm Hello i have a 450 6cta with the older style aftercooler that has no kind of condensation drain on it, and living in the great humid state of florida it likes to build up the condensation in the aftercooler. I was thinking about adding a drain of sort and was reading around and was wondering if just drilling a small weep hole like 1/16” low on the housing would work for this similar to what Tony said the older Detroits had on their set ups? Or i…
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in: General Discussion
5 RepliesSeptember 23, 2023 at 2:06 pm Go fishing and continue your current program–you are head & shoulders above the majority of most All is good.Last Post by:
posted: 7 months ago
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Fuel pressure
This topic has 6 replies, has 4 voices, and was last updated by
July 22, 2023 at 5:15 am Exiting a lock the other day, port motor died. 6CTA M2 ‘97 vintage. On engine filter was almost empty and Racor filter was very low. Changed primary and on engine filters, pumped up the system, engine started up and purred as usual for a couple minutes and died again. How do I test for fuel pressure at the injector pump?
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in: Cummins Marine Engines
6 RepliesJuly 24, 2023 at 8:40 am Be sure your fuel valves are 100% opened…..don’t ask me how I know……Last Post by:
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Thanks Tony and the Seaboard Cummins Forum!
This topic has 3 replies, has 4 voices, and was last updated by
10 months ago
July 5, 2023 at 12:17 pm I just wanted to say thanks to Tony and participants of this forum. After 15 years in a giant shrink wrap tent, I splashed my 1969 Chris Craft Roamer 46 and had a pretty much incident-free 108 mile run to my new home port. As part of the refit, I repowered from Super SeaMaster twin turbo and intercooled gas engines to Cummins 6CTA M2 420hp engines that light off immediately. They ran great the whole way. I discovered some diesel in the bilge at …
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in: Boats & Repowers
3 RepliesJuly 8, 2023 at 7:02 pm Congratulations on the successful trials. Followed this on another forum for years and it’s great to see it on the water. I can only imagine how satisfyingly that was.Last Post by:
posted: 10 months ago
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6CTA Primer Pump Leaks
This topic has 5 replies, has 3 voices, and was last updated by
June 6, 2023 at 10:36 am Hi, I have a ’99 6CTA with 2,400 hours. While changing the on-engine fuel filter last weekend, the primer pump on the Bosch injection pump leaks when pushed, nor does it seem to pump fuel. The engine seems to run normally, my question is can I run the boat this way for a while or is it “mission critical”. Thanks Larry
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5 RepliesJune 13, 2023 at 6:51 am Thanks Rob!….I will follow your advice.Last Post by:
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480 CE Coolant leak – not a hose
This topic has 10 replies, has 5 voices, and was last updated by
11 months ago February 15, 2023 at 12:33 pm Think I finally found source of coolant leak on 2005 480 CE. My question…if coolant leak source is the coolant pump, is it safe to go home 700 miles as long as I keep coolant topped off? Or is leak likely to get much worse? Leak is about 1/2 pint an hour. Once home, I can get my local mechanic to do the repair. <br /><br /> I put paper towels around hose just above circled area leak and they are dry, so leak is not coming …
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in: Cummins Marine Engines
10 RepliesJune 3, 2023 at 3:56 pm So before I started into changing my fresh water pump I sprayed the front end with wd .the squeal went away and stayed away after running for a while.This led me back to maybe a hose . I wrapped all the hoses in the area in paper to see if any blue antifreeze shows up.If nothing shows up there I’ll try to get something under the fresh water pump.This may be hard to do due to access.Any other suggestions appreciated.BillLast Post by:
posted: 11 months ago
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Cummins 480CE Props with New Heads?
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This topic has 24 replies, has 6 voices, and was last updated by
11 months ago February 26, 2023 at 8:46 am Good morning everyone, Good morning everyone, I have a 2005 Sea Ray 420 Sundancer with the Cummins 480CE engines. Before last season I had the heads replaced, after cooler cores replaced, new injectors, new water pumps installed, and new turbos being installed this spring. I’ve done all this as a “1000 Hour Service” process as well as to eliminate the “dropped valve” issue. While running on my existing props the fuel burn was below the curv…
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in: Cummins Marine Engines
June 3, 2023 at 5:01 am 250watt oil pan heaters. When we had the heads installed, we had the mechanic put them on since he was down there. They run on 110AC. Shorepower. I have an outlet in the engine compartment that is on the bulkhead right above our battery box. I plug them in there. I typically let them run about 24hours(or more if possible) and they warm the engine from the bottom up. They heat the underside of the oilpan so the heat conducts up the whole e…
24 Replies
Last Post by:
posted: 11 months ago
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Project Update
This topic has 8 replies, has 5 voices, and was last updated by
1 year ago July 6, 2022 at 10:47 am Hello Forum, We have been hard at work on our 2005 460 Sundancer with 480CE’s. We are part way through the second season with this boat and have made material progress in our list of projects and have 1 “big one” left to go. So far here is what we have done and the results of those efforts: Immediately after purchase we had the cooling circuit fully serviced off engine. Since this is a fresh water boat the coolers came apart …
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in: General Discussion
8 RepliesMay 12, 2023 at 5:59 am WW, We are a little over the curve as well. We usually run 2220 – 2250. We have Smartcrap display so I do not see load. I only see total fuel burn not individual. in our full cruise load/trim we burn 30gph at 2250 and are usually running about 22.5mph and then as fuel burns off or we get a following sea and/or breeze we might get up to 24mph. We are about 10feet longer and 4ton heavier and in fresh water. Work got in the way yesterda…Last Post by:
posted: 1 year ago
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6CTA 430hP 8.3 RPM & Temperature
This topic has 6 replies, has 4 voices, and was last updated by
May 8, 2023 at 10:35 am Sometimes I run at 2,350 rpm’s and temp is 195 What’s the most RPM’ s I can run a long run this Engine and is 195 temp ok or to hot?
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in: General Discussion
6 RepliesMay 10, 2023 at 5:01 am Thanks Rob, I appreciate the info.Last Post by:
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Shaft/Engine Re-Alignment
This topic has 6 replies, has 4 voices, and was last updated by
April 19, 2023 at 7:47 pm 25 Years ago I had SS strust made by my prop shop and they have done well. When the 6BTA’s were installed they were remove and reset as part of the engine install. That was back in early 2019. All has been well. However, I took my extended family out to see the 4th of July fireworks back last summer (’22). I anchored up with dozens of other boats just out of the intracostal and watch the show. However, when heading back to the c…
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in: Boats & Repowers
6 RepliesApril 27, 2023 at 5:12 am Yes I have, and yes, I followed your directions. I only really have one spot on the shaft to measure with a dial gauge and that is 4″ behind the coupler (v-drive boat). My question is where the high & low spots are, and by how much, give you any guidance as to what adjustments in the motor mounts need to be made?Last Post by:
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Hard Start
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This topic has 25 replies, has 5 voices, and was last updated by
1 year ago
January 24, 2023 at 3:25 pm Hi all, I was here last year with a rattle in my Cummins Starboard motor and with a great deal of help from here that problem was solved. 1999 Diamond C Series Loud Rattle – Cummins Marine Forum (sbmar.com) I only have one issue now and that is that when one of the mechanics was aboard he suggested that the rattle was the valves and of course it wasnt but I let him adjust them and since that day it has been harder to start than the Port mo…
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in: Cummins Marine Engines
April 10, 2023 at 4:50 pm Hi guys, I have just tried priming the fuel button after leaving it for a few days. I have been re-reading the posts and wanted to see if it would now take more pumps to prime and return fuel to the tank and it literally took the one press and it returned fuel. Sorry to keep on here but I am learning all this as we go. Thanks Guys, Doug. 25 Replies
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Cummins 6cta 8.3 M2
This topic has 11 replies, has 5 voices, and was last updated by
1 year ago March 16, 2023 at 11:41 pm Hello, Went to the boat this afternoon to start the motors and unwinterize them in prep for this weekend’s planned haul out for bottom work. Both engines started right up no issues whatsoever, let them get almost to temp and went back to engine room for my checks and discovered the exhaust side of the turbo had a ” drip drip” of raw water coming from it, it was not coolant. Higher rpms and the drip would get a little fast…
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in: General Discussion
11 RepliesMarch 22, 2023 at 6:11 pm Thanks for checking Steve. <br /><br /> my cell 904-463-5009. <br /><br /> BrianLast Post by:
posted: 1 year ago
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High idle after cruise
This topic has 1 reply, has 2 voices, and was last updated by
February 21, 2023 at 8:45 pm 2000 6CTA 8.3’s on a SeaRay 410 Express. Occasionally, after cruising 1900-2200 rpm for more than say an hour cruise, when I drop the boat back off plane to idle speeds my STBD engine does not come all the way down to a normal idle. It will remain 150-200 rpms higher than the PT engine. If I shut down the engine and immediately restart, it begins to idle again normally. It has been intermittent, but any advise would be great. Thanks!
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in: Cummins Marine Engines
1 ReplyFebruary 22, 2023 at 5:58 am Do you have a Glendenning synchronizer? And use it? If so, that is probably it. Once you come off plane, with the synchronizer off, just increase the strb throttle a bit and bring it back down to idle. It should. The synchro cable just needs to reset. Mine has done that forever. I’ve just learned to do this after a run.Last Post by:
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6CTA 8.3 M3 valve adjustment
This topic has 5 replies, has 4 voices, and was last updated by
February 6, 2023 at 6:32 am That first time valve adjustment: I have removed the belt protective cover and I want to access the gear with the barring tool but I’m not sure of the location to engage the tool?<br /><br />Is it the bolt visible behing the pulley support?<br /><br />Does it means that I need to deassemble the pulley support? Thanks.
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in: Cummins Marine Engines
5 RepliesFebruary 7, 2023 at 10:42 am I put a socket, wrench, & cheater bar on the dampener bolt on the crankshaft to rotate the engine. Takes a little umph, but it works.Last Post by:
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QSC 500 Will Not Start
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago
January 9, 2023 at 6:46 pm I have a new (to me) ’08 Sea Ray 44DB and out of the blue the starboard QSC500 decided it does not want to turn over. Just did a multi day 300+ mile trip with zero problems. Port side starts fine. Port ignition switch moved to starboard position with same result. 13.8V to starboard ignition switch on bridge, EEC normal function with neutral lights on and in cruise mode, all harness connections to engine checked, gauges on bridge function n…
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in: Cummins Marine Engines
2 RepliesJanuary 16, 2023 at 8:51 pm The first thing I did was jiggle the shifter and then parallel the batteries to eliminate a weak one. I assumed that the EEC would not be showing neutral if the tranny safety switches were not right but you have to jiggle and try it. After seeing Tonys diagram of the solenoid relay I found a corroded magnetic switch that was leaked on by a bad clamp on the RW outlet from the aftercooler to exhaust hose…all of which is outboard on the starb…Last Post by:
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Picture Request: 6CTA Oil Pump
