Man Heat Exchanger

Need some advise on the heat exchanger bundle. D2848 LE403
Both bolts on the back of the heat "x"er are removed and there are not any set screws that are in other exchangers.

All O rings that are accessible have been removed, I have been using a block of wood and a decent size maw and it will not budge. Is there another connection point somewhere?

I am worried about breaking something at this point, any suggestions are most welcomed. Thank you.

I am doing the service because it is part of the service required, routine maintenance. I am not having issues with the heat exchanger but they have to be taken apart at service intervals other wise they will stay together and not want to come apart.

I don't anticipate something being wrong with the core, if there is then the core will go to the proper people who service the cores ( usually the man shops send the cores to bundle/core shops who do that type of soldering/welding on bronze etc)

On my engines I am due for a heat exchanger service, it is now time according to the last records of it being complete....which is removing the bundle/core inspecting and cleaning. I was just seeing if anyone has had issues with them being stubborn on the way out.
Fig. 4

Carefully knock pipe cluster out from the other end, using a block of wood.

4

63


Carefully knock pipe cluster out from the other end with a block of wood.




Figs. 6 and 7

Pull out pipe cluster.
Check pipe cluster and, if necessary, clean it; see

trying to load pics from the service manual.....having a hard time figuring that out also right now

Exactly, the service manuals for the 2848 series says that only the 10 cylinder plant has the retaining bolts. However an acquaintance of mine
who is a man tech has said he has seen them in the 8's once in a while and in some 12's

( I do have the luxury of contacting him with tech questions, but don't want to wear out my welcome so to say)

So trying to gather any and all information prior to "another call"

I wasn't taking a chance, so took entire exchanger off to make sure, plus not enough clearance to try that trick in my er.

CaboFly,
Thanks for your input, to me it's smart to learn these engines and all associated systems and be able to do as many services as you can on your own. Two reasons....you own your engine room, if or when an issue arrives it is typically not at the dock and you will have enough knowledge to know what's going on and temp fix and get back etc.

Second is that you are not at the schedule of a tech, you can do the work when needed on your schedule. A true man tech is 100 percent needed for many things, but I feel routine maintenance is something someone who has good mechanical abilities should do themselves if they want. Nothing wrong with hiring a tech at all, and there are plenty of things only an expert should do, I just want to do and know my items.

Mine has a bunch of rtv sealant as well and I am sure that is holding up the show. I am going to build a press box out of lumber and push it out, the wood block and 5lb hammer whacks made me nervous

I made a press box with and with wood stops and blocks and a jack for the press it came out, Cabo as you were saying it was a large amount of rtv sealant in there as well.

The block of wood and hammer blows were being absorbed by the sealant/orings and the entire exchanger not being completely stationary.

All looks pretty clean. there is a small dent in one of the tubes. No creases and not that bad, what do you all think on this.

1. Omg boat is going to explode get a brand new one
2. Does not look bad don't worry
3. Send to a shop that can braise/weld etc

Thanks, will get a mag glass on that for sure. I have great success with Alco-Metalube grease in any and all marine applications. The mating surfaces are going to be like brand new when I am done cleaning them.