Do I need to get a service to my MAN 1100 every year?

I have the 820 also - they are long out of warranty. So I don't follow Mans recommended schedule. It a schedule designed in favor of the manufacture - injectors every 2 years whether they are bad or not is a bit much IMO. I do repairs now as needed depending on the symptom, eg smoke, rising water temp, losing oil to name a few possibles.

My engines have been excellent to me! After warranty, I do the ordinary fluid changes, clean my air seps , change the impellers regularly, look at the belts. After 2000 hours and 19 years they run magnificently.

The Post 50 and the 820's are a perfect match. 1850rpm I'm moving along at 28 knots effortlessly.

Just as you stated, when the engines are out of warranty you can service them however you like, whatever fits your boating style.
Condition based maintenance is the buzz word of the future, adjust the preventative maintenance to your own operating hours.

Right now the engine manufacturers have preventative maintenance schedules based on predicted load profiles and predicted time between overhauls. They measure this with either fuel consumed or hours operated.

With big data in the works, the analytic programs are coming where everything will move to conditioned based preventative maintenance events. The analytical software just has to catch up to the volume of big data, maybe another year away although it will hit the commercial marine markets before the recreational marine markets.

Why do you say that? Mans are very robust - they need no more attention than any other quality engine. The items you point to are normal for all engines?

I check the valve lash about every 2 years.

For us, it's simple. We follow manufacturer's recommendations at a minimum and often do more and this is true whether under warranty or not. Might we be spending more than necessary? Yes. But far more likely we're saving in the long term by avoiding major and untimely work.

Capt

Isn't that what I wrote?? Your comments are not what I considering "babying" an engine - they are just normal maintenance. NOW, RE-READ MY POST. BTW Mans only have a single zinc in the oil cooler are far as I know, so your generic advice may have the OP looking for something that's not there. He asked about Mans. Mans don't want to be babied, they want to run!

Old boater.

I understand what you need to do for your customers as a contractor, but I'm not changing 20 fuel injectors every 2 years if they aren't malfunctioning once I'm out of warranty.. Do you know of any other manufacturer that recommends such a severe interval? I'm being specific to Mans, not generic - Man manual says "replace" not check. 21 year old engine and they roar like the beasts they are.

#10 was to me? Why would I kick a wonderful dawg like you.... Look forward to another year of learning from all you guys/gals

Food for thought - The commercial guys, especially tugs, are going conditioned based maintenance and they are succefully increasing their TBO’s over book or published values. This makes sense for fleet operators who are managing their costs while still protecting their investments.
It will trickle down to the recreational boater eventually, although those with deep pockets will usually stick to published maintenance schedules as a type of “hedge fund”. Not absolutely necessary, but nice to have if you can swing it

I have no customers, just extended family and our own boats. I know nothing about a 21 year old MAN, but a lot about recent ones and we do and will continue to follow the manual for those. The only thing now that gets changed on a two year schedule is both valve caps on the expansion tank. One thing you might argue with is changing all hoses on a four year basis but we do it. There is currently no schedule for checking or changing the injectors on MAN common rail. As I don't have a manual for a 21 year old MAN, I'd be very interested in seeing one. Searching online but no luck so far.

Here is the current MAN schedule:

http://www.jimmyrogersyachtbroker.c.../sites/81/2015/02/MAN-CR-maintenance-plan.pdf

OB

For some reason I thought you were in the business. You sure are knowledgeable! I'll locate my manual and email it to you. I have no experience with the CR's and don't know their schedules. The OP said his was a 1991 so I suspect his is mechanical like mine. Let me confirm that I am an ardent believer in regular and thorough maintenance, it's just that some of Mans requirements on the 820's, as I understand them, are singular - not all but some.

I also misunderstood the Capt's post about "babying" I thought he was referring to light throttles. My 820's will almost put themselves at 1850 rpm, if I don't.

Cheers to you and your crew!