MAN 1360 V12

If you need to ask, you really are better off hiring a Man mechanic. You're talking about an engine that costs $80k to rebuild if you screw it up. Mans don't have any zincs. Does the boat have a built in oil drain pump? Usually if it does, Man's have a selector valve with a red handle mounted low and near where the gear mounts to the engine. One direction drains the gear, the other the engine. On the oil filters, there will be 2 drain bolts near the bottom of the housing, hit the head with a hammer a couple of times before trying to remove one of them. Have a catch bucket or rubbermaid underneath it and works best if you have an oil pump at the ready to stick right in or over the bolt hole or to drain the pail as it fills. You want to drain this for a while if waiting on gravity (30 mins) or not nearly is long if sucking on it with a pump. Then you have to take the bolt out of the center top of each housing and they're almost a 2 man job, one to hold the housing down and the other to take the bolt out (spring loaded). Once you take the bolt out and housing off, take the element out. You want new elements, new o-rings, and new crush washers for the drain bolts and oil filter housing bolt. When you install the new filters, you need to align and hold the housing down and get the bolt started and tighten it (2 sets of hands helps a lot here), do not over tighten either the filter or drain bolts. Use Mobil delvac 15w-40 (it's what man recommends/sells), for Common rails delvac full synthetic is REQUIRED, but your engines are pre-common rails I'm almost positive,confirm with MAN dealer, so they use conventional oil.

I didn't see where he mentioned what year his were, so wondering why you said probably pre-common rails?

We have V12-1360 Common Rail.

Well, the OP should be looking in his manual for appropriate oil regardless.

They made V12 pre-common rails. I ran a 57' Bertram that had them. They were rated at 1350hp and figured possibly rated at the OPs 1360. The only V12 common rails I dealt with were rated 1550hp. But I see MAN does have 1360hp common rails, so I'm guessing the common rails are rated at 1360hp to differentiate them from the 1350hp non common rails.

But if they are indeed common rails you want to use the Mobil Delvac full synthetic, think it is 15w-40, but might be 10w-40, I haven't looked at the 5 gallon bucket in the engine room lately. I purchase it from the MAN dealer, so I know it's the correct stuff.

Boatdiesel.com has some manuals

I know....but you said you were guessing his were pre-common rails and I didn't see where he gave the age of his boat or engines, which I think would help him in seeking an answer. That was my question if perhaps I was missing something.

Not so complex, the oil filters....which also happen to be the same ones on the German U boat in the museum in Chicago, are a messy pain in the rear. Also because nobody uses the remote mount kit so they're both in the aisle and accessible because yeah that's $4500 per engine. I wish the Germans would really get with the 2000s and use spin on filters like everyone else does and get away from using those stupid threadserts.

The fuel filters are another story. You have to put one in first because with the other one in place won't be able to get the previous one in (or out). Also cannot fill them completely with fuel so have to open the fuel bleed screws on top of the housing and hand pump the rest.

BE VERY CAREFUL to hit every bolt a few times with a hammer and hard tap (to loosen up the crush washers) and even then 1-2 threadserts will come out with the bolt regardless, usually will screw back in and reseal. Why are they using threadserts in a cast iron oil filter mount anyways???

I could service a Neptunus with C 18's (oil/filters, all fuel filters) in 3-4 hours by myself. ALL of the filters were spin ons (or racor) and in the aisle I could sit on a 5 gallon pale and change all including priming the new ones in an hour without even rushing. Another boat I manage with great access with common rail 1100's took me over a day to do the same service.

If I were you, I'd just pay the dealer to do the service. Man is very picky about warranty, and they're not a fun engine to work on even if out of warranty.

I've seen the MAN/U Boat filter housing on MTU motors as well. It's a German thing. Just like Mercedes cars used to be (maybe still are?), a paper filter and housing.

Huh?

What's to bash? Yeah those MAN primaries are a royal pain in the butt (these are the wall mounted filters) with the clear bowl on the bottom that NEVER wants to come off, and the delicate wiring harness on them that you have to be super careful with. I HATE doing a service on a MAN, last one I did was about 3 years ago. I've sub-contracted them out ever since.

Agree the wiring harness on the primary filter is a pain. Actually have disconnected the wiring on both of mine for that exact reason. Never had a water issue and I check all the time for one.

The boats we have MAN's in are typical in that they are sport boats and have all the possible engine that will fit. At the best, that is going to lead to some service challenges.