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- Cummins Marine Forum Topics
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QSM 11 670HP Performance Issues (900hrs)
This topic has 20 replies, has 4 voices, and was last updated by
1 year ago
September 11, 2022 at 1:44 pm This year has troubled me… See below. Port engine has been burning more fuel (as much as 2GPH) depending on speed all season. Overall GPH has increased as the season went on… Which is typical; bottom growth, higher ambient temperatures, humidity, etc. Aug 1st – Cleaned the bottom and running gear. Prop shop checked the props and said a couple blades were bent over slightly. They thought the yard may have done it by block…
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in: Cummins Marine Engines
20 RepliesApril 25, 2023 at 3:34 pm So the boat was run again and these are my EGTs. Again, these are QSM-11 715hp in a 4700 Tiara Sovran. We are seeing less than 1,000deg at all rpm’s. So I assume if I’m running under 1,000 at my cruising speeds of 2,000-2,100 my manifolds and turbos should be out of the danger zone?Last Post by:
posted: 1 year ago
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07 QSM 11 670HP Turbo Leaking Exhaust
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago August 13, 2020 at 11:36 am Turbo Leaking exhaust from one edge. Not sure if it is the connection or the turbo body failing. See attached pictures. Any thoughts?
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in: Cummins Marine Engines
2 RepliesSeptember 11, 2022 at 1:09 pm I have had this boat since 2019 with quite a bit of seat time (400+ hours). This year has troubled me… See below. Port engine has been burning more fuel (as much as 2GPH) depending on speed all season. Overall GPH has increased as the season went on… Which is typical; bottom growth, higher ambient temperatures, humidity, etc. Aug 1st – Cleaned the bottom and running gear. Prop shop checked the props and said a couple bl…Last Post by:
posted: 1 year ago
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Prop speed, worth doing?
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This topic has 28 replies, has 16 voices, and was last updated by
2 years ago March 1, 2019 at 12:30 pm Thinking of trying some new ACME props and wondering while I’m at it if I should put prop speed on the running gear. Has anyone had experience with this product?
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in: General Discussion
March 7, 2022 at 1:22 pm I’ve had good results with prop-speed. Basically extended cleaning the running gear for 12 months and not having to pull the boat last season. Prop-speed applied May, 2020 No running gear cleaned in 2020 1st cleaning Labor day weekend 2021 (had lost 2 knots), one side was fine the other had a barnacle strike Had diver clean running gear again in Nov B4 the water got to cold as a pre-caution Once its scape it’s lost it’s ef…
28 Replies
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posted: 2 years ago
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Priming a QSM11 after Fuel Filter Change
This topic has 2 replies, has 3 voices, and was last updated by
2 years ago December 20, 2021 at 11:57 am I read in another thread that the QSM11 would self-prime after changing fuel filters. I changed the racor and then filled that bowl with diesel fuel but when I changed the fuel filers mounted to the engine I did not fill them with fuel as I did not want to contaminate them. How long do I need to turn the ignition on for them to be primed before starting?
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in: Cummins Marine Engines
2 RepliesFebruary 21, 2022 at 7:56 pm I have no problem changing the Racor filters without filling them, they fill from gravity. The on-engine filters have to be manually filled prior to re-installing in my boat. That does the trick though.Last Post by:
posted: 2 years ago
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QSM11 engine inspection for purchase
This topic has 10 replies, has 4 voices, and was last updated by
2 years ago August 12, 2021 at 8:31 am Hello.I am looking at a 2002 Sea Ray 48 Sedan tonight and I am trying to do some research as far as things that I should specifically look for around the engines. I am in Ontario Canada and it is very hard to find Cummins or marine technicians that know diesel marine super well. I have always done all my own maintenance and like to go the extra mile. Oil samples every year, fresh impellors etc. Any tips or list of things I should look for would…
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in: Cummins Marine Engines
10 RepliesSeptember 9, 2021 at 6:38 pm I don’t think it is reasonable for the Sea Ray 480, 500 or 52DB Sedan Bridge with a QSM11 670HP to tune the props enough to get 20GPH at 2100RPM.Last Post by:
posted: 2 years ago
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Mechanic needed – Annapolis area
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago May 22, 2021 at 6:58 pm Coolant service needed. 6CTA8.3-M. Twin engines. 2000 year with 2850 hours.
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in: Cummins Marine Engines
1 ReplyMay 24, 2021 at 12:45 pm – Diversified/Bay Shore Marine – Shore Power SolutionsLast Post by:
posted: 2 years ago
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Sea Ray Strut – Long Shot Help Requested
This topic has 1 reply, has 2 voices, and was last updated by
3 years ago
May 11, 2021 at 5:18 am To all – My East Coast (MD) propeller shop is telling me that my Strut is too bent to repair and the pitting is of concern as well. See picture below. Looking for a replacement strut if anyone has a resource. New is 2 months more on the hard. May have to go down that road but was taking a shot if anyone knows of or has a resource for a replacement. Thanks to all in advance… – Algonak Marine (OEM) Cast #25550 – Sea Ray P…
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in: General Discussion
1 ReplyMay 11, 2021 at 11:59 am No affiliation but this guy posted on the Albemarle FB page. https://www.facebook.com/hashtag/strutsruddersbearings?refid=18&_ft_=qid.6961107879594237533%3Amf_story_key.1143048599544144%3Atop_level_post_id.1143048599544144%3Atl_objid.1143048599544144%3Acontent_owner_id_new.1456052855%3Apage_id.181782022337478%3Asrc.22%3Astory_location.6%3Astory_attachment_style.photo%3Afilter.GroupStoriesByActivityEntQuery%3Atds_flgs.3%3Aott.AX-EV-xdbPB4IC…Last Post by:
posted: 3 years ago
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QSM Pre-Purchase Pictures
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This topic has 32 replies, has 6 voices, and was last updated by
3 years ago January 3, 2021 at 12:32 pm 2002 42′ Egg Harbor convertible, 36k # with 2001 635hp QSM11’s with factory underwater exhaust (I’ve read about the RUMBLE) and ~760 hours. ZF325A @ 1.733 Transmissions and 4 blade, 28×34 props on a 2 ¼” shaft. The boat has fresh water flush system installed with adapters on the strainers. I’ve read dozens of articles on this site to prepare but am new to Diesel engines (previous OB boats) and have a long way to go. Ove…
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in: Cummins Marine Engines
March 18, 2021 at 6:32 pm I’ve been reading along on this thread and went thru the exercise. A couple quick questions. props are 3B 23 x 24 cup 7, so should I add +1 to the pitch? For a straight IB with 1.75″ shafts, does the prop slip seem OK or is it a bit high? Thanks RPM KNTS MPH Trans Pitch +1 MPH Slip Prop Slip 2050 19.5 22.4445 1.75 25 27.7 0.81 0.19 2250 21.5 24.7465 1.75 25 30.4 0.81 0.19 2300 22.5 25.… 32 Replies
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posted: 3 years ago
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QSM-11 engine model confusion
This topic has 13 replies, has 4 voices, and was last updated by
3 years ago August 19, 2020 at 1:47 pm I have been looking online at several Searay boats that have QSM-11 engines. Some of the descriptions say they are 616HP and others say that they are 660HP. I cannot figure out exactly which engines they are to look at the performance charts as none of the listed HP ratings match. Can someone enlighten me as to which models they might be?
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in: Cummins Marine Engines
13 RepliesSeptember 30, 2020 at 4:15 am This is from another forum participant. Larry Backman. He has a single QSM engine downeast style boat. He spent quite a bit of time and money tuning his setup. His EGT observations align with the info you just posted. Start Larry I don’t know if we have talked about it on this thread but an EGT gauge is an invaluable tool to see what’s going on with the true engine in whatever conditions you may encounter. I often adjust upwards or downwards…Last Post by:
posted: 3 years ago
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QSM 670/2100 hrs – what would you do?
This topic has 17 replies, has 4 voices, and was last updated by
3 years ago November 17, 2019 at 5:39 am In light of the others QSM thread – Here is a photo of my 3 year old QSM with 2100 hrs. To me it says the beginnings of a soot leak which I intend to address this winter. I will Have both coolers pulled and serviced, and proactively replace the manifold and gaskets. The engine has burned about 9000 gallons of fuel, ie low duty cycle and is typically run either at 860 RPM/2.5 GPH or 1875 RPM/18 GPH. In mid summer / heavy canyon load si…
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in: Cummins Marine Engines
17 RepliesMay 21, 2020 at 8:24 pm Realized on our 220 mile round trip run from Annapolis MD to Cape May, NJ. last weekend that I was losing about 2 Gallons of coolant into the bilge every 3 hours or so of running. We were in the first leg of the trip when I realized, so I continued to fill the Coolant Tank every couple hours of running. Had our mechanic pressure test the system today and he figured out the Heat Exchanger “plate” was weeping pretty good when he appli…Last Post by:
posted: 3 years ago
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Turbo Flange Leaking Exhaust from Heat Shield
This topic has 3 replies, has 3 voices, and was last updated by
4 years ago April 11, 2020 at 8:43 pm Can you guys give me some tips on a repair? See pictures. I have been smelling exhaust and found evidence of Exhaust Leaks from around the Turbo Flange and I believe from both sides or maybe it is spilling all around the Heat Shield. I am able to feel the exhaust air pushing out of both sides of the heat shield. You can see Exhaust Dirt on the new Air Filter. This is after just a few hours of run time. 2007 QSM 11 670
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in: Cummins Marine Engines
3 RepliesApril 12, 2020 at 7:31 am Richard, History of the issue–It goes back to 1999 when the 1st DRY manifolds were released on a marine QSM11. Regardless of what you have read and Cummins has claimed to do as to “upgrades”, the issue persists today. Understand there is not a sure fix for this if you need more than about 18 GPH of HP at 2000 RPM to satisfy you need for speed. And even propped that light guarantees nothing as the design of the system is just …Last Post by:
posted: 4 years ago
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Sorry but…QSM Dry Exhaust Questions
This topic has 6 replies, has 3 voices, and was last updated by
4 years ago January 7, 2020 at 8:31 pm Seems there are a number of us QSM folks with Dry Exhausts… No fix seems available to me after all the reading I have found. Question 1 – What does Cummins suggest after all of these years of common issues with the dry exhausts? Question 2 – I have seen some threads on a Wet Exhaust Conversion. Is there hope for a resonable conversion? Thank you for your responses
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in: Cummins Marine Engines
6 RepliesFebruary 23, 2020 at 4:17 pm See attached.Last Post by:
posted: 4 years ago
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QSM-11 660 Test Results after Pitch change
This topic has 6 replies, has 5 voices, and was last updated by
4 years ago December 23, 2019 at 2:55 pm Tony here are the test results you asked for: Well we are finally finished with all of the coolers and heat ex changers bench service. We also had to replace the turbo’s. I have attached a pdf that shows my first test before the work and after. The results are amazing. The lines below are just for 1900 rpm before and after. Please see the PDF for full numbers Before Props 27×44 1900 rpm gph 22.1 Knots 25 Load 76% NMPG .56 …
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in: Cummins Marine Engines
6 RepliesJanuary 5, 2020 at 5:15 pm Richard Lynch wrote: Seems there are a number of us QSM folks with Dry Exhausts… No fix seems available to me after all the reading I have found. Question 1 – What does Cummins suggest after all of these years of common issues with the dry exhausts? Question 2 – I have seen some threads on a Wet Exhaust Conversion. Is there hope for a resonable conversion? Thank you for your responses Any thoughts?Last Post by:
posted: 4 years ago
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Fleetguard Fuel Filters
This topic has 12 replies, has 6 voices, and was last updated by
4 years ago March 11, 2017 at 1:22 pm I use the Seaboard Double Double system for my fuel filtration. My vacuum gauges are reading about 2″-3″ mm HG. Still in the green zone. A friend who is a powerplant generator operator said the filters need to be changed out every 2 years regardless of the reading because the paper elements break down. I have never heard that. Is that something to be concerned with or should the vacuum gauge be the determining factor. Thanks in ad…
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in: General Discussion
12 RepliesDecember 7, 2019 at 6:30 am On a Cummins electronic engine ( can’t speak for others as I do not know there “fuel system”), max fuel flow occurs only under load, plus on an average, total fuel flow is measurably less with the common rail engines. As a comparison– Max fuel flow with any QSB 5.9 is about 50 GPH at full engine load/RPM Max Fuel flow with a 6BTA 5.9 370 is about 73 GPH and occurs at approx 1800- 2000 RPM in neutral or under load. Lowe…Last Post by:
posted: 4 years ago
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QSM longevity question
This topic has 3 replies, has 3 voices, and was last updated by
4 years ago November 12, 2017 at 8:13 am Posting for a downeast boats forum member Engines are in a 2000 39′ Liberty Express. 6,500 hours. Port Engine has blow by, so repowering both engines. See details of each engine below. Boat in water until December 1, available for sea trial. Starboard Engine: Cummins QSM11 Marine Diesel Engine with 6,500 hours.Included is a ZF gear with 1:1.485 gear ratio.Currently in boat, available for sea trial until December 1. Motor is strong, new in…
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in: Cummins Marine Engines
3 RepliesDecember 5, 2019 at 6:17 am If I wanted to do a simple check, I’d also unplug the boat from the dock a day before too..That will take any “top charge” off the batteries……… OIL PAN should feel really cold……….Then, just see how they start.. If below 40F and they start up within 5-7 seconds, things are good.. Above 50F, quicker, Above 60F, quicker yet. TonyLast Post by:
posted: 4 years ago
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2007 QSM 11 Surface Rust Valves 500 Hours
This topic has 5 replies, has 3 voices, and was last updated by
4 years ago August 21, 2019 at 11:33 pm During a routine valve adjustment on both engines our mechanic found surface rust on the valves for both engines. He cleaned them both up and suggested we send the oil out for testing in 30 hours or so. Our current oil samples show clean however the previous owner had recently changed the oil (within 10 hours) so we know that probably is not a good indicator. Thoughts? Suggestions?
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in: Cummins Marine Engines
5 RepliesAugust 24, 2019 at 6:11 am Based on the reported performance of ~30mph @ 2000rpm burning 22GPH I would probably look into having the props tuned a bit. Read the following and then my advice will make sense. The last sentence says it all Propping the Cummins Marine QSM 11 to Prevent Exhaust Issues take an inch or two out of the prop pitch and that should get your fuel burn down under the recommendation and that will extend the life of your exhaust manifolds. You have …Last Post by:
posted: 4 years ago
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QSM 11 670HP Performance Issues (900hrs)
