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- Cummins Marine Forum Topics
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QSB 5.9 Fuel Cooler Removal and SMX Kit..Anyone ??
This topic has 3 replies, has 3 voices, and was last updated by
1 year ago October 30, 2022 at 8:01 am Good day, Considering removing the fuel cooler on my QSB 5.9 480. Has anyone on this forum removed the fuel cooler off of their QSB 5.9? Any performance issues or any issues going forward after removal ? Thank you, Bill DĀ
3 RepliesNovember 5, 2022 at 6:23 pm I would think it would be as simple as taking the 2 lines off the cooler and connecting them together.ĀLast Post by:
posted: 1 year ago
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6 CTA 8.3 M3 start battery
This topic has 3 replies, has 3 voices, and was last updated by
1 year ago
November 3, 2022 at 11:52 am I have a 1998 6 CTA 430HP with a recently rebuilt Bosch starter. It starts fine now. Boat has TWO AGM 8D start batteries, new, rated at 1450 cold cranking amps each. I am trying to find what the spec is and what the best practice is for start battery capacity. Elsewhere on this forum someone mentioned 1225 CCA was adequate, but I did not see any reference or documentation. I have never had an engine this large and never needed more than one star…
3 RepliesNovember 4, 2022 at 10:10 am Great, thank you for the replies here.Last Post by:
posted: 1 year ago
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4BT and "Tonys Tips" coolant upgrades
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This topic has 40 replies, has 4 voices, and was last updated by
1 year ago
March 7, 2017 at 7:37 am I have twin 4BT in my Bertram 28.Ā I am very happy with the set up for my recreational activities.Ā Good on fuel and pretty dirt simple.Ā Last september I unfortunately had catastrophic failure when the rear (#4) exhaust valve disintegrated and the rest is history. Now, I have new block and new cylinder head new pistons etc…. After all this work (doin myself) I want to be sure that I make the colling system as good as I can and would like …
November 3, 2022 at 6:43 am I thought about manufacturing some legs from the stinger, and mounting a tank like that on the legs.Ā I like how you brought yours away from the bulkhead.Ā Thanks for the picture, that gets the old gears turning in the brain.
40 Replies
Last Post by:
posted: 1 year ago
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From the looks of it….
This topic has 11 replies, has 4 voices, and was last updated by
1 year ago
October 27, 2022 at 2:35 pm Hello all, I am new here. As a boat buyer, I”m about to conduct an overall survey of these 6BTA 330’s. I plan to start with a blow-by (provided it’s safe to do so).Ā As you can see in the pictures, neglect is probably an understatement and the spray paint on the hoses prove it. There is something hiding in there. I would like to ask you if you could notice the rear motor mounts being replaced by utilizing the gearbox as a mount…
11 RepliesNovember 2, 2022 at 9:41 am Thank you Tony, note taken.ĀLast Post by:
posted: 1 year ago
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Am I overpropped?
This topic has 4 replies, has 3 voices, and was last updated by
1 year ago October 31, 2022 at 11:35 am I’m sure this topic has come up many times before but rather than read a million posts I’d rather ask about my specific situation. I’m the proud new owner of a 2005 Sea Ray Sundancer 420 with a pair of 400 hour 6cta 8.3’s with 450hp. I was told that around 280 hours the Starboard engine ate a valve and was repaired by a local Cummins repair facility and Cummins covered some of the repair despite being out of warranty. As …
4 RepliesNovember 1, 2022 at 3:17 pm Get your tachs checked for accuracy. Do it at the dock, engine warm at a steady state 2500 RPM.. Write it down.. Then check WOT no-load RPM by just “looking at the tach”Ā for a second or three.. If they are accurate and you are making full mechanical throttle,Ā you should see right at 2900-2950RPM on the needles. Write it down.Ā There are very early 450 diamonds ( 430 BHP /2600 minimum rated RPM)ĀLast Post by:
posted: 1 year ago
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6bta air intake heaters 330hp
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago October 31, 2022 at 2:43 pm My alternator is getting very hot at idle due and the alternator is trying to pump out 115amps while idling to supply power to the heater intake grid. I have to travel about 10 minutes at 4 knots to get out of the speed restriction zone by then the alternator is very hot. The heater grid seems to have 2 circuits is it possible to disconnect only 1 heater or better to disconnect both? If it is ok to disconnect 1 only do you suggest to remove the …
1 ReplyNovember 1, 2022 at 3:03 pm Put the heater control circuit on a simple switch (wellĀ under 10 amps)Ā at the dash. This has been posted in various places on this web site when discussing the grid heater circuit and your specific concerns.Last Post by:
posted: 1 year ago
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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
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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Tach stopped working
This topic has 5 replies, has 2 voices, and was last updated by
1 year ago October 29, 2022 at 2:13 pm 1990 6BTA 300 M2 with a Prestolite alternator (appears to be one main wire to the Battery, and one other for the tach). Port Tach went to zero while underway disabled the glending synch. Both stations read zero.Ā I’ve tried tracing wires but not sure I’m checking the right wires. One wire from Alternator somehow lead to 2 at the VDO tach.Ā Any suggestions how to diagnose? The alternator is charging.Ā
5 RepliesOctober 30, 2022 at 11:58 am Snoop around on google –dozens of after market suppliers– DBĀ Electric comes to mind..Last Post by:
posted: 1 year ago
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QSM11 Hunting
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago October 10, 2022 at 8:38 pm I have a 2022 Sunreef Power Catamaran that has an issue with a Cummins QSM-11 engine. After 4-5 hours running at 40% engine load the rpms drop 200-300 RPMās every 30-40 seconds, increasing to a drop of 500 RPMās. Eventually the engine shuts down. Have Fuel polisher and Racor Water/Filter system. Only on one engine, dual tanks with 1300 gallon capacity. Only issue on on engine. Any thoughts are greatly appreciated and truly am happy for this comm…
1 ReplyOctober 30, 2022 at 5:05 am Sounds like classic fuel starvation– Install a vacuum gauge close to the on-engine filter ( 0-15″ hg) –Something ( crud)Ā is being picked up inside the tank and is probably not evenĀ making it to your off engine filters.. A vac gauge would confirm yea or nayLast Post by:
posted: 1 year ago
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Cummins heat grids
This topic has 9 replies, has 6 voices, and was last updated by
1 year ago
April 13, 2022 at 7:03 pm I have a 2003 Sea Ray 410 Express with twin Cummins 6C8.3 diesels. Ā My mechanic is suggesting he disconnect the grid heaters. Ā Not necessary in Florida and hard on the batteries and alternators. Ā Is this ok to do? Ā Any risk to engine and performance? Ā Are the grid heaters separate from the glow plugs? Ā Thanks very much.
9 RepliesOctober 30, 2022 at 1:08 am It looks like there is 2 heaters in the grid is it possible to disconnect 1 only to help the alternator EtcLast Post by:
posted: 1 year ago
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Lead in gear oil
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago October 27, 2022 at 9:01 am Hi, I sent a gear oil sample for analysis this fall and it came back as a severity 4 for lead.Ā I have a Twin Disk MG 5050-SC transmission.Ā Has anybody had a similar problem with this transmission or is the lead coming from somewhere else? Thanks.
1 ReplyOctober 29, 2022 at 5:36 am Probably gear oil cooler breaking down.Last Post by:
posted: 1 year ago
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Uneven turbo pressure at cruise 370hp BTA
This topic has 7 replies, has 2 voices, and was last updated by
1 year ago October 27, 2022 at 8:13 pm Guys: My Cummins 370hp 6BTAās are running at different turbo pressures at cruise Ā The Port motor runs at 11psi, 600d F egt the starboard at 16psi at 2300rpm 800d F egt The port motor also lags in spool up and a bit more of a puff of black smoke then starboard when getting over the hump. The port motor has a fuel cooler The starboard motor does not that is how they came from Seaboard, 11y apart The port motor burns a quart of oil every 50-80hr S…
7 RepliesOctober 29, 2022 at 4:47 am Here’s some further info as to the turbo inspection and the low power What a Marine Diesel Turbo should look like when Inspected Understanding Low Power TroubleshootingLast Post by:
posted: 1 year ago
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Intake manifold heater 330Hp Cummins 2003
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago October 28, 2022 at 6:59 pm Can anyone give me info on being able to disconnect this as it is stopping on and drawing approximately 115amps from the alternator at idle which only cuts out for about 5 seconds then it keeps coming back on. This is causing my alternator to get quiet hot. Our Temp in this part of the world is quiet warm I have been told that it is not really required in this part of the world due to the warmer climate. If possible Information on the bes…
1 ReplyOctober 29, 2022 at 4:18 am This thread says it all.Ā Cummins heat gridsLast Post by:
posted: 1 year ago
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Sheared bolt inside C450 Turbo
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This topic has 22 replies, has 9 voices, and was last updated by
1 year ago January 30, 2017 at 8:54 pm Hi SB crew I have a Riviera 4000 offshore express on Gold Coast, Queensland which featuresĀ 2 x 1997 6CTA8.3 aka C450 Diamond Series with around 1000 hours on the tachourmeters. The other morning I found a bolt in the engine room and it is from the turbo where the exhaust bolts to the turbo. Please refer attached photos. Recent running wasĀ not hard and last couple of runs before this discovery we were only doing aĀ leisurely 10 knots or 1100rpm.Ā …
October 27, 2022 at 2:49 am Hi SB Crew After almost 8 years to the day we sold our beloved Riviera. In due diligence we pointed the new owner, Rodney to your awesome site, this forum and these specific topics. In those 8 years we never had the rocker covers off … not saying that is a good thing… but lucky for us we never had a failure. Also never got to install my new SMX sea water pumps. The best thing we did was to plumb fresh water input after the sea cocks.… 22 Replies
Last Post by:
posted: 1 year ago
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DeAngelo Elbows on Sabre 42
This topic has 3 replies, has 2 voices, and was last updated by
1 year ago
October 26, 2022 at 6:00 am I am looking for comments on the exhaust architecture on a Sabre 42 with QSB engines and Zeus Pods. The DeAngelo stainless elbows have been suffering premature cracks at the welds. The attached pictures show the elbow leaving the exhaust flange, turning down 120 degrees. A 6″ long hump hose is attached. On the other end of the hump hose is a 6′ FRP tube that runs to the exhaust outlet on the pod. A ‘strap type’ stanchion …
3 RepliesOctober 26, 2022 at 3:45 pm No, two different alloys. Ā But both good for high temp and high corrosion environments. Ā <br /><br />Anyway sorry to distract from your original question, which Iām not qualified to answer. ĀLast Post by:
posted: 1 year ago
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How to test to see if power is going to ECM on a 480CE?
This topic has 12 replies, has 4 voices, and was last updated by
1 year ago October 22, 2022 at 4:09 am How to test to see if power is going to ECM on a 480CE?The starboard 480CE fault code warning lamps do not illuminate as expected when engine is energized. Also Engine will turn over but not start.Battery voltage is 13.6 volts and engine cranks fast enough so it should start.Engine was running fine but quit as if someone shut it off. Engine hours no longer show up on systemview, fault code lamps do not light up during self test and voltage meter…
12 RepliesOctober 26, 2022 at 12:50 pm Great to hear you figured out the problem.Especially without having a Cummins mechanic come out to the boat.Great to have a site like this where we can throw these issues around. I had to do similar with a trim tab wire that was shorted.Finally had to run a new wire from the switch to the motor.BillĀLast Post by:
posted: 1 year ago
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New guy and new boat
This topic has 3 replies, has 3 voices, and was last updated by
1 year ago October 25, 2022 at 10:21 am Hello all. I just subscribed to the forum and looking for recommendations. I just purchased a 98 carver 400 cmy with 2 6bta 5.9 370hp (1,400 hours). First time having Diesel engines on a boat. start up was ok 45 degrees out and it sat for two weeks.Ā Sea trial went well rpmās wot at 2,980 RPMās for 15 mins and confirmed with tach tap on crank pulley. All temps where normal.Ā Iām suspecting lack of maintenance on these engines because prior owner …
3 RepliesOctober 26, 2022 at 5:40 am Kevin,Ā you are overpropped and that is a big boat.Ā You need to get 3100rpm @WOT and make it easily. The replacement of the aftercooler sounds like the last owner was at the mercy of the local boat mechanic….only 1400 hours…Ā prob just needed a good servicing but who knows. No leaks is a good thing on the engines, normally I am not worried about oil analysis but if it picked up traces of salt water intrusion then that is good to kno…Last Post by:
posted: 1 year ago
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QSM 11 raw water pump rebuild – how many hours?
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago
October 25, 2022 at 10:51 am My 2016 QSM 11 now has 3945 hours on it. Ā At what point do I consider rebuilding the raw water pump and for that matter, the coolant pump. Ā No issues or signs of issues, my yard swaps in a new impeller each winter. <br />also, I canāt find a QSM rebuild kit in the store, does one exist?
1 ReplyOctober 25, 2022 at 5:48 pm Different Cummins engine.Ā This is general for any RWP. I put on about 150 to 200 hrs yearly andĀ rebuild my RWP everyĀ 5 yrs. IĀ don’t put on nearly the hours in 5 years you do but time also matters. I am going to suggest that a full rebuild and inspection be done of the RWP now.Ā Ā Ā The backĀ wear plate, the cam fingers including the screw that hold it in place, the mechanical seal for the shaft to the outside, the front or cover plate,…Last Post by:
posted: 1 year ago
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480 CE Starboard engine stops or goes to 0 rpms unexpectedly
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago
October 17, 2022 at 11:46 am Started an 85 mile Gulf Panhandle crossing in 1 to 2 foot seas. Following happened: Starboard engine went from 1050 rpms to 0 unexpectedly. I did some checks, could find nothing wrong, so I restarted engine. Ran perfectly. No trouble lights on and oil pressure and temperature good.Ā I have vacuum gages on Racor filters and they looked very good so does not seem like it was fuel starvation Went up to cruise at 2050 rpms. After 10 miles samething …
2 RepliesOctober 23, 2022 at 6:20 pm Clark, thanks for the reply.Ā My problem has changed to a hard failure and I have created a new post for it.Ā Engine will crank but not start now.ĀLast Post by:
posted: 1 year ago
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How much coolant
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago October 23, 2022 at 7:01 am Hi, need to remove my turbo and heat exchanger off my 6cta 450.Ā How much coolant do I have to drain in order to do this?
1 ReplyOctober 23, 2022 at 8:07 am 5-6 gallons should be safe as it needs to drop BELOW the exhaust manifold levelLast Post by:
posted: 1 year ago
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QSB 5.9 Fuel Cooler Removal and SMX Kit..Anyone ??
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