Cooler off visual inspection MAN

[Portofino]

I had some techs on board today ( Yacht Engine Servise - local SoF MAN agents ) replacing a suspect exhaust intermediate gasket .Engines are 2003 vintage MAN 2876 - 700 Hp
Here's some images of the coolers inside ,it's on its side by 90 degrees .
When I switch off ( wife does it once a week ) i,am inside the ER with my " magic " IFRed temp guage comparing hot engines , in various places ,
I can hear the trickle of water presume sea water down to the WL ,so it seems to me the coolers drain ?
I.e. - they don,t sit pickling in salt water for weeks on end salting up ?

Reason why I conclude this ( happy to stand corrected ) ,the tech s say this is the 1 st time they have been off 2003 engines .

Temps are always 86 after a long lay up and drop to 84/85 after a couple of days @ 1800 rpm for an hour or so .Even in August .
Personally looking @ the pics 90 degrees on ,it seems the tubes are pretty clean .
That's not bad considering .
It's just this --- its all new ish ,and a steep learning curve to me and on here I read about ridlyme and acid flushes when temps are 90 + etc and wonder when or if it's gonna happen to me .
mike F posting pics of MAN fouled up tubes etc and so on .
Boat does get used often .

Tubes look fine --- any comments welcome ps :encouragement:
View attachment 66472
View attachment 66471

 

[omega2]

Are there any holes in the lower halves among that sludge??

 

[Portofino]

Are there any holes in the lower halves among that sludge??

I,don,t know -- but poss you can just make out circles ?

 

[NormanB]

I am sure you have nothing to worry about but it’s a pity they did not remove the cover so you could see the whole end of the tube-stack.

 

[pan]

On our Man 800's they specify 4yr or 400hr strip down & clean out of the coolers, we did this 4 years ago with YES in SoF (posted some pics on the forum previously) planning similar work this winter.... feel more comfortable doing this as specified & not risking blowing an engine!

 

[MapisM]

Here's some images of the coolers inside ,it's on its side by 90 degrees

The correct pics orientation is after rotating the pics 90 degrees clockwise, right?
I am asking because it's a bit weird that the most dirty part appears to be the one which is at the bottom in your pics, while the actual bottom should be on the right side of the tube stack...

Regardless, yes, having in mind also the heat exchangers that I just had cleaned on my 2004 boat, yours don't seem worse - if anything, probably a bit cleaner.
How many hours have you clocked so far, if you don't mind me asking?
Besides, which are the exact points where you measure the temps with your IR gun?
I mean, it ain't trivial to know where exactly to point the IR to measure the cooling liquid, the engine oil, the raw water in/out, g/box oil, for instance...

 

[Portofino]

The correct pics orientation is after rotating the pics 90 degrees clockwise, right?
I am asking because it's a bit weird that the most dirty part appears to be the one which is at the bottom in your pics, while the actual bottom should be on the right side of the tube stack...

Regardless, yes, having in mind also the heat exchangers that I just had cleaned on my 2004 boat, yours don't seem worse - if anything, probably a bit cleaner.
How many hours have you clocked so far, if you don't mind me asking?
Besides, which are the exact points where you measure the temps with your IR gun?
I mean, it ain't trivial to know where exactly to point the IR to measure the cooling liquid, the engine oil, the raw water in/out, g/box oil, for instance...

It's on it's side above ^^

My mistake it's just off centre the two pipes are vertical over each other when fitted ,in fact on the pic ^^ you can see a mounting bracket ( top R of shot ) .

Here it is sat on the other engine for better orientation hopefully ?-- on it's side

View attachment 66480

I measure various points on the cooler body -- always more / less within a few degrees from the Boining ( sp ?) electronic screens
Oil temp from the filter body - the sensor is just 2 cm away .

As I said all temps seem ok except ( in another thread ) I mentioned the charge air coolers which are always less than ER ambient -say recently 15 degrees - I know daft as no air con is feeding it after the turbo,s heated / compressed it ???

We are off for a sea trial with the YES guys hopefully later today when they fit the new "Intermediate cylinder plate "
Part 6 in the schematic below
View attachment 66481

These eventually as time goes by -seep seawater ever so slightly and eventually rust -tell tale signs are initially seawater stains under the exhaust manifold ,it's hard to see cos it's tucked away deep ,even harder for the V blocked guys .
In a way as always the Germans are clever as it's just this not the whole exhaust manifold that needs replacing ,due to the corrosion, just the plate ,which costs
€ 800 -+ loads of gaskets as everything inc the HE -( cooler in the pics ^^ ) and turbo had to come off to get to it .
€1200 labour ,
Still not bad for 14 y old engines ,other side is fine btw .
800 hrs -2003 engines .
Any one with MAN -as all the parts are interchangeable , my exhaust will fit a V 12, as it's 1/2 the engine - should look and check for seepage - right under the exhaust manifold where it fits the block ,Normally the view is obscured by the coolers .
Hope this is helpful to other owners .

 

[MapisM]

I'd be curious to understand what this intermediate cylinder plate is, also because it's easy to guess that also V8 (like mine) and V10 engines have the very same stuff.
But I'm afraid that by clicking your links, all I get is the following message... :ambivalence:
Invalid Attachment specified. If you followed a valid link, please notify the administrator

 

[Portofino]

Hopefully the pics are here
https://imgur.com/gallery/NMGZ6