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#4552371 - 10/23/17 07:40 PM Marine diesel 4,000 hour service interval
DeepFriar Offline


Registered: 10/31/13
Posts: 1370
Loc: Georgia
Cummins has an interesting set of addon devices that they say enable 4,000 hour service intervals on some of their marine, and I suppose other, diesel engines. They are:

-Centinel which is an integrally plumbed oil system that burns a potion of the in-service lube oil and replaces it with new incrementally over time.

-Prelube with QuikEvac which stores oil under pressure while running and prelubes on restart (ala Accusump). As the name suggests it also quickly removes the sump contents (presumably at the 4,000 hour point, I'm guessing).

-Eliminator which has a 20 micron full flow stainless steel non-replaceable filter allied withva centrifugal separator to remove the rest. Thus, no throwaway filters.I

All three are used in combination to reach the aforementioned 4,000 hour interval "when used with an approved oil sampling program".

https://cumminsengines.com/marine-eliminator

And then look down on the right side of the page for the other accessories.

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#4552390 - 10/23/17 08:12 PM Re: Marine diesel 4,000 hour service interval [Re: DeepFriar]
JHZR2 Offline



Registered: 12/14/02
Posts: 41781
Loc: New Jersey
My FIL and I were just discussing OCIs. He mentioned many boat captains are on a 7 day change cycle which is around 100 hours. That's the 500ish shp diesels on sport fishing boats. Running 40 or15w-40.

4000 hours is a long time. Like roughly a full year of 12hr days.

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#4552408 - 10/23/17 08:23 PM Re: Marine diesel 4,000 hour service interval [Re: DeepFriar]
Kuato Offline


Registered: 10/23/05
Posts: 7094
Loc: Colorado
At roughly the same as 24000 miles at 60mph that seems very reasonable, especially with bypass filtration and TBN replenishment. Long haul truckers go as far, or farther, on OCIs.
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Thick vs Thin test: 15k / 43k miles complete

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#4552447 - 10/23/17 09:13 PM Re: Marine diesel 4,000 hour service interval [Re: Kuato]
Chris142 Offline


Registered: 06/05/03
Posts: 16820
Loc: Deplorable in apple valley, ca
Originally Posted By: Kuato
At roughly the same as 24000 miles at 60mph that seems very reasonable, especially with bypass filtration and TBN replenishment. Long haul truckers go as far, or farther, on OCIs.
more like 240k?
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#4552489 - 10/23/17 10:05 PM Re: Marine diesel 4,000 hour service interval [Re: DeepFriar]
IndyIan Offline


Registered: 09/23/08
Posts: 9092
Loc: Ontario, Canada
I assume they must just have a large remote engine oil reservoir and the system adds and removes oil automatically. Not a bad idea compared to weekly changes with a normal sized sump. Plus they burn just mix the old oil in with the fuel, which makes a lot of sense.
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#4552606 - 10/24/17 06:24 AM Re: Marine diesel 4,000 hour service interval [Re: Chris142]
Kuato Offline


Registered: 10/23/05
Posts: 7094
Loc: Colorado
Originally Posted By: Chris142
Originally Posted By: Kuato
At roughly the same as 24000 miles at 60mph that seems very reasonable, especially with bypass filtration and TBN replenishment. Long haul truckers go as far, or farther, on OCIs.
more like 240k?


Math FAIL.

Thanks for the correction, disregard my previous post....
_________________________
Thick vs Thin test: 15k / 43k miles complete

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#4553255 - 10/24/17 04:13 PM Re: Marine diesel 4,000 hour service interval [Re: JHZR2]
DeepFriar Offline


Registered: 10/31/13
Posts: 1370
Loc: Georgia
Originally Posted By: JHZR2
My FIL and I were just discussing OCIs. He mentioned many boat captains are on a 7 day change cycle which is around 100 hours. That's the 500ish shp diesels on sport fishing boats. Running 40 or15w-40.

4000 hours is a long time. Like roughly a full year of 12hr days.


Wow, that really is often. I wonder if that's supported/indicated by analysis or is simply "good practice" as defined by the small business/entrepreneurial boat captains who would be out the $200-300K for a repower? It's easy to see that those boats are run hard and with a lot of gear changing. So I further wonder if those 100 hour intervals are for the transmissions (TwinDisc, ZF, others)? Also, while I have no experience with them, aren't the
sportfishers usually very high powered? Very.

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#4554594 - 10/25/17 08:48 PM Re: Marine diesel 4,000 hour service interval [Re: DeepFriar]
BrocLuno Offline


Registered: 09/06/15
Posts: 5518
Loc: Kalifornia Kollective
Our typical small boat (under 65 feet) diesel engine program when I worked for NOAA was OCI at 500 hours with UOA. Since I serviced the boats in my group, or oversaw the service, we did 250 hours. That was mostly CAT 3208T at 240 to 315 HP spinning 2,850 all day every day for 8 hours. They were not rated for 2,850 continuous, but pushing Hamilton Jets drives means you need RPM, so that's what they ran.

10,000 hour inspections for OH. Most went 15,000 hours before an in-frame OH.

The Detroits OTOH, got the full 500 hour intervals and seemed to run until the Sahara would freeze. Of course they changed oil into the bilge underway and required diapers, so not a fair comparo laugh

If I had a big enough boat with twin Cummins and enough room, I'd run the program (and accessories) as stated, but I'd be sampling at every 1,000 hours ... That kind of filtration and in-time replenishment is a good system. You just need to stay on top of it in case something goes off the rails ...


Edited by BrocLuno (10/25/17 08:52 PM)
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4555559 - 10/26/17 07:49 PM Re: Marine diesel 4,000 hour service interval [Re: BrocLuno]
CT8 Offline


Registered: 10/09/14
Posts: 10974
Loc: Idaho
VT 903 Cummins?
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