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- Cummins Marine Forum Topics
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QSB5.9 – Holset HX40 v Cummins Turbo
This topic has 3 replies, has 3 voices, and was last updated by
8 months ago
August 31, 2023 at 10:19 am Hi I recently bought a Galeon 420 that has a pair of QSB 5.9 Cummins – fantastic! Unfortunately the previous owners didn’t take good care of her so I’m working my way through servicing and replacing various bits – it’s starting to add up! Whilst looking to replace the injectors and the turbocharger I noticed that these were off the shelf parts from other companies with Cummins badge on them with a much lower price. …
3 RepliesSeptember 2, 2023 at 11:03 am I’ve had good luck with Naples Turbo or Turbo Exchange.Ā ĀLast Post by:
posted: 8 months ago
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Impeller remova QSB 5.9l
This topic has 7 replies, has 7 voices, and was last updated by
8 months ago November 5, 2018 at 7:20 am Hi Tony, A very simple question: how to remove the impeller from the water pump on my QSB 5.9 ? See attached picture. Thank you !!
7 RepliesSeptember 1, 2023 at 3:38 pm Hi,Ā Sorry, I had not seen Tony tips which give advice on impeller.Ā I’m going to buy the one that advises instead šLast Post by:
posted: 8 months ago
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160 vs 180 thermostat
This topic has 3 replies, has 3 voices, and was last updated by
8 months ago
August 31, 2023 at 6:20 am I currently have the 160 deg thermostat installed in my 6bta. I do a lot of drift fishing at idle and slow trolling. My temp gauge usually reads 145-150 even at cruise. Should I switch to the 180 thermostat considering how much idling and slow trolling I do?
3 RepliesSeptember 1, 2023 at 7:06 am So Iām on the Long Island Sound. Rare that my runs are more than 45 mins. My boat is way overpowered as itās a 25ft downeast hull with a 6bta. The engine is rated to 370 but the prior owner detuned the engine to about 315 by under propping. My cruise is around 2300 RPMs. But most of the time Iām idling while drifting for fluke or trolling at 3.5 kts for stripers. There is white smoke at idle and at the slower trolling speeds. I have a raw water …Last Post by:
posted: 8 months ago
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Is this normally warm
This topic has 10 replies, has 3 voices, and was last updated by
8 months ago July 27, 2023 at 9:17 pm I just had these serviced a few months ago. I notice when I run the boat they are pretty warm. End caps are nice and cool. I just don’t remember them being warm on previous trips. Thanks for the intel. -Lew
10 RepliesAugust 29, 2023 at 8:43 am Questions that need answers but are never asked are dumb. Ask away, Ā all is good.ĀLast Post by:
posted: 8 months ago
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Turbo or Aftercooler Core
This topic has 9 replies, has 5 voices, and was last updated by
8 months ago August 10, 2023 at 11:58 am I have twin Cummins BTA 5.9. I am cleaning and servicing two very, very dirty oily (airside) aftercooler cores. Both engines are suffering from the same symptoms. They both have dirty, oily aftercooler cores and they both have oil leaking at the turbos.Ā Question: Is the dirty core causing turbo pressure and leaks at the turbo or is the turbo oil causing the aftercooler cores to get oily? The turbos seem to spin normally and have no play or loos…
9 RepliesAugust 29, 2023 at 5:36 am If it’s just oily clean it up with a solvent and a paint brush, inside the air tube/hoses too.Last Post by:
posted: 8 months ago
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Dry liners for QSB5.9
This topic has 7 replies, has 6 voices, and was last updated by
8 months ago August 10, 2023 at 8:33 pm I recall seeing somewhere that you said thatĀ that dry liners are unsuitable in reconditioning QSB 5.9s. My insurers are requesting quotes to repair my engine after seawater up the exhaust, and the quotes I have received are based on using dry liners. Is there some some way I can document to my insurers that dry liners are not suitable for this engine. Many thanks for your help
7 RepliesAugust 27, 2023 at 9:58 am IMO, do not compare 20-35HP per liter parent bore engines to 50HP++ per liter parent bore engines.Ā Notice the word MARINEĀ & besides,Ā QSOL is full of errors,Ā just like you seem to want to buy into.Last Post by:
posted: 8 months ago
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Code 559 low fuel pressure – accelerating
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This topic has 29 replies, has 8 voices, and was last updated by
8 months ago September 18, 2018 at 5:01 pm Hello, Ive been trying to solve the 559 low fuel pressure alarm for some time now with no results. Right now it only activates when power is put to plane and when WOT. Boat has a pair of 5.9 QSB 355 hp 650 hrs 2007 Here a list of things done with no sucess in order: 1)Replaced racor. (Issue improved but still present) 2)Replaced engine fuel filter and vacum gauge on racor) 3)Replaced pressure sensor on fuel rail. 4)Replaced fuel transfer pump …
August 26, 2023 at 1:11 pm Look for the ecm and find the lines. Dont have pictures, the code can be many other things. . Good luck.Ā
29 Replies
Last Post by:
posted: 8 months ago
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Cummins QSB 5.9 lost power on plane and vibrates
This topic has 14 replies, has 5 voices, and was last updated by
8 months ago July 29, 2023 at 9:08 am Hey guys, new to the forum, Ā We recently just took our Tiara 3600 sovren to key west and back. Put about 4-500 miles on the boat and itās powered 380 QSB cummins. while crying back through the inter coastal about 10 miles from home my starboard engine lost power and I brought the engines down to an idle. The engine never turned off, but now it vibrates the boat in neutral and has power loss. Ā The oil pressure was perfect and the heat was at 180…
14 RepliesAugust 25, 2023 at 5:24 am Luke when you have time give this a thorough read: Propellers Move Boats, Engines Just Turn ThemLast Post by:
posted: 8 months ago
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White smoke at start 6BTA 5.9 210 hp 5300 hrs
This topic has 3 replies, has 2 voices, and was last updated by
8 months ago August 23, 2023 at 6:22 am I have white smoke at start and idle rpmās. Iāve adjusted timing not sure whatās next.
3 RepliesAugust 23, 2023 at 8:19 am What is white smoke? Give this a read.Ā Points to a few things that might be relevant.Last Post by:
posted: 8 months ago
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Racor Filter Emptied before starting
This topic has 7 replies, has 4 voices, and was last updated by
8 months ago August 21, 2023 at 12:49 pm I am installing in my 38 Chris Craft two 430 hp RecĆ³n Cummins 6CTA engines with two racor FG1000 filters.Ā Before starting the engines, I fill the fuel filters and they are emptied shortly before starting the engines and I don’t understand why?Ā I wonder: should the filter retain the fuel?Ā Does the engine have a check valve?Ā Everything installed is new and I don’t know where I can have the error and if this is normal?Ā Can you help…
7 RepliesAugust 23, 2023 at 6:03 am A quick Google search does indeed say the ball acts as a backflow preventer. The Seaboard spinon filters don’t have backflow preventers and I asked Tony about the use of backflow preventers a couple of months ago and he doesĀ not recommended them. So we are back to why Both drain their fuel.Ā I feel it is from an air leak.Ā Likely after the Racor or in the Lid to the Racor itself.Ā Check the edge of the filter body where the square cut ori…Last Post by:
posted: 8 months ago
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1993 Cummins 6BTA5.9 M2 Coolant issue.
This topic has 5 replies, has 3 voices, and was last updated by
8 months ago
August 21, 2023 at 2:50 pm Hello, I guess I’ll get to the point. The captured coolant system on one of my 5.9 is loosing coolant everytime we take the boat out. The coolant isn’t in the bilge, or the oil. I have had the heat exchanger pressure tested and it’s good. Wondering if someone out there has any suggestions. Thanks
5 RepliesAugust 23, 2023 at 5:48 am yes. it has been bypassedLast Post by:
posted: 8 months ago
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Cracked rocker arm assembly
This topic has 1 reply, has 2 voices, and was last updated by
8 months ago August 20, 2023 at 6:02 am I have a 6BT 210 CPL 742 with about 3000 hours since major overhaul (new head, injectors, etc).Ā I had a small oil leak coming out of valve cover #2 so I tightened the bolt about 1/8 turn hoping that would take care of the problem.Ā I immediately regretted doing that since I overtightened the valve cover bolt a little bit.Ā I didn’t feel anything break at the time, so I left it be, hoping everything would be good. About 30 minutes after we…
1 ReplyAugust 22, 2023 at 5:39 pm In the overĀ 40 yrs since this design came to be,Ā 1980-ish ?) , I have never seen this–NEVER. Give me a few days do look at some old engines I have in stock to seen what can be done.. You need to send me a direct email to remind me. [email protected]Last Post by:
posted: 8 months ago
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QSC 8.3 Sea Water Pump Removal
This topic has 2 replies, has 2 voices, and was last updated by
8 months ago August 21, 2023 at 8:40 am Hi guys. Just a quick check. I am going to remove my sea water pump from my stbd engine. I was wondering about the gear box where the pump is connected. Will there be any fluid surprises for me when I do this other than some residual water in the tubes? Any advice or words of wisdom to offer before I begin would be appreciated? šĀ Thanks.
2 RepliesAugust 22, 2023 at 5:21 pm Ha ha…..Everything looks scary to me man. My first boat. But, yes it looks easy. I have some Metal Lube left from the core maintenance. I put that stuff on everything! Thank you for taking the time.ĀLast Post by:
posted: 8 months ago
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6CTA turbo removal/shop manual?
This topic has 2 replies, has 2 voices, and was last updated by
8 months ago
August 21, 2023 at 3:38 pm New member up in Maine could use some help. Apologies if this has already been posted somewhere but Ive had no luck finding the info. Ā My ZF gear has gone out and I have to remove the turbo assembly to pull the transmission.Ā Ā Im not new to working on engines but Im new to these 8.3s. Ā Is there a shop manual that describes the process of removing the turbo? Ā Ā Any tips or advice would be appreciated.Ā
2 RepliesAugust 22, 2023 at 7:23 am Thank you Jimmy!ĀLast Post by:
posted: 8 months ago
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Declining Speed a Turbo filter Issue?
This topic has 5 replies, has 3 voices, and was last updated by
8 months ago
August 20, 2023 at 12:15 pm I have a 6BT-5.9m 210 hp engine (Serial # 45795214) driving a 1999 Mainship Pilot. I have noticed over the season that the SOG has been declining – at the beginning of the season I was doing 12.7 knots easily at 2400 rpm and 15.6 @ WOTĀ which was just a tad south of 2600 as indicated on the tach- now the average speed has fallen to about 10.2 at 2400 and 12,5 at WOT. This is kind of a rough average taking into account currents and tides in…
5 RepliesAugust 22, 2023 at 6:38 am Pay for a short haul & get the bottom cleaned, perform a visual inspection of the prop(s) and the bottom.Last Post by:
posted: 8 months ago
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Oil pressure test port for QSC
This topic has 3 replies, has 2 voices, and was last updated by
8 months ago August 16, 2023 at 9:36 am I was wondering if anyone knows a good oil Ā pressure test port for the Cummins QSCās. My starboard engine has gone to a zero pressure display and alarm. This was just after starting the motor and putting it into gear. It spiked to 70 psi then went to zero. Iām guessing it is just a malfunction on the electronic sending unit. However, I would like to hook up a manual gauge to confirm that my electronic sending unit is bad. I would also like to pr…
3 RepliesAugust 21, 2023 at 1:48 pm Additional picturesLast Post by:
posted: 8 months ago
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6BT210 Cracked Rocker Arm Assembly
This topic has 2 replies, has 1 voices, and was last updated by
8 months ago August 20, 2023 at 2:50 pm I have a 6BT210 CPL 742 with about 3000 hours since a minor rebuild (new head, new injectors, rebuilt fuel pump, etc.) A week ago I noticed a slight oil leak coming from #2 valve cover.Ā I decided to tighten the valve cover bolt a little (about 1/8 turn) hoping it would solve the oil leak problem.Ā I think I overtigtened that bolt.Ā About 30 minutes from the dock on our last trip, I go to increase the RPMs to 2000 and noticed I could only get 18…
2 RepliesAugust 21, 2023 at 12:41 am I took the rocker arm assembly off by removing the head bolt. The smaller 8mm bolt snapped off flush with the head so I will have to extract it. Ā I don’t see any damage to the head and the push rods look straight. Hoping i can put a new rocker assembly on with a new head bolt and it’s good.Ā There is a small piece of metal missing (see pics) which could have ended up in tappet cover/oil pan. Does this mean I have to pull the …Last Post by:
posted: 8 months ago
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New boat, Starboard engine overheating when pushed hard
This topic has 5 replies, has 5 voices, and was last updated by
9 months ago August 15, 2023 at 2:42 pm Hello, so I received my boat last week and it is a Viper 303 built in 2013 with twin Cummins 2.8l 216hp units. I am very happy with the performance and everything but noticed that the starboard engine is running hotter than the port-side engine, especially when pushed at more than 65% throttle. So port side engine runs at around 80 degrees Celsius (or 176 Fahrenheit) when pushed hard and does not exceed that generally and the starboard engine ru…
5 RepliesAugust 20, 2023 at 3:49 pm Tony has a wealth of info about many of the common cummins Engines. Also a section titled getting to know your engine. Engine schematics and pictures of most of the most often parts requiring service or inspection.Ā this Forum has a wealth of info and hundreds of members who are knowledgeable and willing to help. But certain basic lingo and familiarity of what you hAve helps us all help you.ĀLast Post by:
posted: 9 months ago
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Oil Pressure Issue After Rebuild – Need Help
This topic has 2 replies, has 2 voices, and was last updated by
9 months ago
August 19, 2023 at 4:09 pm I recently finished rebuilding a 6CTA and IĀ“m having trouble with the Oil Pressure. Any ideas are appreciated.<br /><br />The engine runs great. Cold start builds 60psi. After the engine is warm pressure drops to 40psi at 2200 RPM. After continued running at 2,200 the pressure drops further to 25 PSI. Engine idles at 10PSI after running.<br /><br />Besides less than ideal oil pressure, my main concern is that the oil pres…
2 RepliesAugust 20, 2023 at 11:33 am I’d be happy with 40 psi at cruise.Ā However the pressure drops to 20-25 psi after about 10 minutes.Ā ĀLast Post by:
posted: 9 months ago
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Cummins 6bta temps
This topic has 2 replies, has 2 voices, and was last updated by
9 months ago
August 20, 2023 at 5:15 am Just swapped my temperature sending unit and the temp went from 180 on the old unit to 200ish on the new unit. The motor seems to be running at 180. Just wondering what I should do other than the temp gun. Gauge problem?
2 RepliesAugust 20, 2023 at 5:56 am I did not check it but it is a vdo gauge and vdo sender.ĀLast Post by:
posted: 9 months ago
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QSB5.9 – Holset HX40 v Cummins Turbo
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