Servicing Cummins QSC 500 8.4 after cooler, heat exchange, oil+ fuel Cooler

[Matt DiMauro]

I’m going to be removing my heat exchangers to service them and would like to know if the cores come out the same way as they do on the aftercoolers? Also, how do you go about soaking the oil and fuel cooler in the solution? is there a core in that assembly as well, if so how do you remove it and if there is not how would you clean it. Lastly, can I pressure test the core and housing together or do I need to test the core and then install it into the housing and retest?

 

[Carpediem44DB]

Matt, There is a core in the fuel and oil cooler but it is not removable. I found a big cork at my local ace hardware store and stood the cooler unit on its end and filled with the acid solution over night then flushed with fresh water. The heat exchanger core is removable and mine came out a lot easier than the aftercooler as there are no silicon seals going the length of the core.
If you have or can build a fixture you can pressure test the core separate from the assembled unit.
Have fun.
Rusty

 

[JimG]

Just happen to have this link for your engines handy:
http://www.clubsearay.com/index.php?threads/official-cummins-qsc-500-thread.47619/