MAN 820 or 1050 Motors?

The MAN dealer from Mystic CT is Bayside Diesel, nice group of guys who are fair to deal with, and quite knowledgeable and extremely competent technicans.

Comments on 1050's using BOSCH Injection Pumps

I have 1050's on a Year 2000 510 Bertram. I have been forced to become somewhat of a expert on the BOSCH Diesel injection pumps.

Every 2500 hours replace both pumps Barrels and Plungers. The Motors will sing.
Stay away from non-certified BOSCH shops that do not have the correct test equipment or you will be throwing away money for less than complete rebuilds. These pumps slowly lose fuel around the Barrels over time and the smoke is because of partial transition at idle even though the ECM is not calling for it. (voltage to pumps should be between 07 and 08 volts) Once I went for the full rebuilds on my pumps the engine response increased nearly 25% faster. I used These Guys and they are the REAL deal. Deal direct with them OR your pump shop, do not let your mechanic manage the "proce$$." I lost two seasons of effective usage because of smoke and the moral of the story is that the SMOKE is almost always related to the Diesel Injection Pumps. The Man motors themselves are fantastic!

watch these guys...don't turn your back on them, they seem nice but will turn on you like a bengal tiger!

13 years with them. Never had anything but excellent work and cordial relations.

Onyx,

If anything, we're watching you now. You just contradicted two very respected members of YF and one of them is a highly experienced captain. If you have legitimate gripe, then substantiate your claim. Otherwise your post is HIGHLY suspect.

I have to agree on the costs. We have 900 Mans and we are coming up on the 400 hour service. It was estimated at nearly 20k. However, I do love the speed and power they provide.

We have had no smoke, and no real significant oil burn between changes. We cruise at 28 knots at 62GPH (both engines).

Ken

Mans d2840le403

I here that in idle these motors run on 5 cylinders and rest the other 5 due to high torque ? Not sure this is true any comments

Ken,
I also have the CR900 Mans (2005) and the 400 hr service was approximately 7k and just recently had the 1000 hr service and it was 12k. It shouldn't cost you 20k for the 400 hr service. I also live in Fl and purchased the boat in Ft. Myers in 08.
Skip

Yes they run on 5 until about 1000rpm. Some vibrate, some don't depends on the particular motor

To elaborate, they run on one bank (side) of the motor, the right bank. That is until they start building just a touch of boost pressure, then the injection pump opens the other bank. They is usually around 1000 rpms, but can be a little higher or lower depending on the hull they're put in and load factors.

Thx CaptJ

I never knew how that worked....

The mechanical V-8 starts on 4 cylinders. Two on each side. If not mistaken upon start up cylinders 1, 4, 6 & 7. After warm up and increased load the pump brings in the remaining 4.

Reviving an older thread - Does anyone know what is the "acceptable" compression test range for an 820 MAN D2840LE-401? One source said "recondition necessary under 24 bar" I wish to confirm this information.

I had the 1050 on a Sarnico 58. Amazing Engine. They where well behind any of my expectation. Its true they suffer from Sensor problem but this is mainly due to the temperature of the engine room. And because usually they install the 1050 on engine room where you install the 820 the heat can be a problem. You have to make a good use of the blowers in particular after you stop the boat.
Another important think is to use sometime the engine at full power as they suffer of smoking problem as TurboCharger is easily dirty due to bad combustion if you sail always at low RPM.

Hi All

Considering a change away from a Sportfish to a "semi-displacement" and looking at an Offshore 72.

Can anyone please shine any further light on 2005 era MAN D2840 LE 423 (10 cylinder, 1100 hp) engines?

I am concerned about running/maintenance costs but am much more concerned from getting home from the Reef.

Sensors seem to be a comment complaint. Do I just have these changed out?

I have run a set of those for several years now. They're good engines, and figure 85GPH for both at 80% load. They don't have as much torque as Cat's, so you'll see the load facter get lower as you burn off some weight (fuel etc) and you can increase RPM's as much as 100 rpms and still be at 80% load, also in sea you'll see them gain/lose 50rpms from what they're set at. They're smooth, quiet, and run nicely and clean at cruise and lower rpm's.

That being said, electronics are not their strong suit which you already know. The set I run is in a 2007. It had a lot of erroneous alarms intermittently on the port engine for a while we couldn't figure out what it was, turns out the coolant pressure sensor was shorted out.....but would read like a Christmas tree of alarms when it did it (coolant pressure, air inlet pressure, fuel pressure, and something else all within seconds). We've had to replace both alarm/hour meter boards at a cost of $5k for both, 1 fuel pressure sensor, 2 coolant pressure sensors, 1 helm display (the old style small one), and you may have to replace the helm controls here or there if it's the old style ones.....doesn't have the chrome/metal through the entire hole or opening. The only thing mechanically I've had to replace was 1 secondary fuel filter housing because the bleed bolt threadsert came loose in it. Yes you just change out the sensors. You should always be able to get home with them.

There is no issue with engine room temperature causing the sensors to fail in this boat. It has good ventilation, plenty of room around the engines and the boat cruises at 28 knots.....

ALSO you have to use the full synthetic Mobil oil in the common rails. It is pricey around $45-50 per gallon. The upside is you can go 400 hours on it, or annually. I think it holds around 12 gallons per engine.

Thanks very much CaptJ. Excellent feedback.

Any other comments on the Offshore 72, while we're at it?

The M4 interval is for 400 hours, but a MAN dealer told me that MAN-MEC had issued a service bulletin saying that in the US market the oil should be changed every 200 hours.

200 hours is a much more reasonable number, but since it's due every year or 400 hours, whichever comes first. I haven't seen any yacht I've worked on accumulate 400 hours in a year or anywhere close to that, except 1 or 2.....

I have never ever run an Offshore. But it seems that every owner I know that has one raves about both the ride and the build quality. One owner I work for, his brother bought one and they are doing the entire PNW, then the Panama Canal, and over to here. So far he and his brother (who I work for) love it as well as the layout. He has a 65'. One of our member Kafue also had one and raved about the boat as well and is local to you in Australia.