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MAN engine life

Old 09-14-2019, 07:25 AM
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Default MAN engine life



I was checking out a friendís 2017 Viking and noticed the engine placard on his V8-1200s MANs. Note lower right - Useful Life: 2000 hrs/10 years ! That canít mean what it seems to mean?

Last edited by ThreeJs; 09-14-2019 at 07:27 AM. Reason: Add image
Old 09-14-2019, 07:27 AM
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Originally Posted by ThreeJs View Post
I was checking out a friendís 2017 Viking and noticed the engine placard on his V8-1200s MANs. Note lower right - Useful Life: 2000 hrs/10 years ! That canít mean what it seems to mean?
yep. Thatís a guideline. They may last more hours/time but an engine overhaul is usually due about then.
Old 09-14-2019, 07:35 AM
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What does that cost? $75,000 each? So budget $15,000/year amortized over 10 years?
Old 09-14-2019, 07:37 AM
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I would say 40-50k per engine. So 100k for both.
Old 09-14-2019, 07:44 AM
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Did older diesels have the same or similar recommended schedule as well?
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Old 09-14-2019, 07:47 AM
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Yep. Detroitís are similar (owned by man/mtu now). Cummins are better on that front.

But big Diesel engines are usually similar like this.
Old 09-14-2019, 07:54 AM
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Originally Posted by anthem-00 View Post
Yep. Detroit’s are similar (owned by man/mtu now). Cummins are better on that front.

But big Diesel engines are usually similar like this.
That is in line with everything I've read or been told . So if checking out used Sporty's keep that in mind .
Old 09-14-2019, 08:57 AM
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has much to do with hp made and fuel burnt. reduce both and double life
Old 09-14-2019, 09:19 AM
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That goes along with manís 1000 hour service, perform the service and major at 2000 the boat will probably be together forever and have limited failures.
Old 09-14-2019, 09:47 AM
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Looking thru Cats engine options is interesting . When looking at the same block you have different HP's , TBO's , duty cycles and types of operation whether it is emergency power generation to pleasure boat ... even running off alternate fuels . Neat stuff .
Old 09-14-2019, 10:40 AM
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I have serviced cat 3126 with 14,000 hrs.
and a Cummins 5.9 with 16,500. both were never overhauled.
one commercial owner had 26,000 out of a cummins
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Old 09-14-2019, 10:50 AM
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Commercial guy at my marina has a single screw with John Deere power, just about 30,000 hrs, being overhauled as I type.
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Old 09-14-2019, 01:15 PM
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We had the 880hp MANs in the 43. The 1000hr Service was about $20k a side. We did Majors at 2800hrs at about $70k a side. Honestly, they looked new inside. If I had it to do it over, I would do the 1000hr at 2000hrs and the 2000hr at 4000hrs. They were bulletproof engines, but required very regular filter changes and preventative measures.
Old 09-14-2019, 01:21 PM
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Originally Posted by tango2echo View Post
We had the 880hp MANs in the 43. The 1000hr Service was about $20k a side. We did Majors at 2800hrs at about $70k a side. Honestly, they looked new inside. If I had it to do it over, I would do the 1000hr at 2000hrs and the 2000hr at 4000hrs. They were bulletproof engines, but required very regular filter changes and preventative measures.
were you losing any fuel economy or power before major? Burning oil? Any issues at all?
Old 09-14-2019, 02:26 PM
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Its the rated duty, they have list in the manual that breakdown usage. Medium duty I think its like no more than 1000hrs per years. I spoke to man mechanics prior to buying my boat because every boat I looked at seemed to have man's 1000 service ranged from $20-$30k for both, not a side. I don't know why you would have to do majors at 2800 thats just broke in? Theres guys putting over a 1000 hours a year their boats, I have 350 hours in 5 months on my cats.
Old 09-14-2019, 02:49 PM
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I've seen a 6bta Cummins with 17,000 hours on it. Owner has a new replacement ready to go in but is going to run her just to see how long it'll go
Old 09-14-2019, 02:59 PM
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I know I'll catch crap, but here goes. I just don't understand the popularity of man ,mtu , or volvo diesels. They are more expensive initial purchase, the parts are ridiculous $$, 1000 hr service requires a mortgage and overall don't have the longevity of cats, Cummins or deere. Note I've owned all 3 usa brands and a pair of volvo. After 1000's of hours total the usa diesels are IMO much more reliable, less complicated and less maintenance required.
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Old 09-14-2019, 03:00 PM
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Originally Posted by cjones1991 View Post


were you losing any fuel economy or power before major? Burning oil? Any issues at all?
No to both, however, there were a few other issues going on like a small oil leak, a generator issue, and the owner wanted a SeaKeeper. Both motors were pulled, majored, the entire engine room painted and overhauled, new generator installed along with the SeaKeeper Gyro. It was something like $350k on a $350k boat. To say it was maintained "with an open checkbook" is an understatement.
Old 09-14-2019, 04:44 PM
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Originally Posted by Slimshady04 View Post
I just don't understand the popularity of man ,mtu , or volvo diesels.
I'm not sure I would put Volvo in the same category as man or mtu. I know they had a couple questionable common rail models but some of their old mechanical engines were bulletproof. True, I'd rather have a cummins but I'd take a volvo over a man or mtu any day
Old 09-14-2019, 04:50 PM
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From my own experience their old motors were bulletproof but the new ones with blowers, turbos, computers, plastic strainers, ect are anything but reliable. Friend has a 30+ year old volvo commercial truck that has been amazing in it's toughness, my ips volvos completely opposite.

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