Heat Exchanger and Trans Oil Cooler Maintenance

[David Parker]

It has been 5 years since the local Cummins dealer serviced the charge coolers, HX and transmission oil coolers on my 1997 6CTA8.3 450 Diamond engines, and this time I am doing the job myself. I have Tony’s excellent article on aftercooler service, but what should I do to service the HX and oil cooler? I can’t seem to find articles or postings in this forum. Do these need air pressure testing like the aftercoolers? Many thanks, David Parker

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[Zac Schramm]

To be honest I didn’t clean them myself, but the end caps come off, so you can try in place, just doesn’t seem like something I’d want to do in place.

[David Parker]

Thanks. Do the HX and trans oil coolers disassemble like the charge coolers? If not, do I need to demount them from the engines or can I rod them out and clean them in place (access permitting, of course)? Thanks, David

[Zac Schramm]

Good idea to pressure test all of them if you want to avoid contaminating your fluids with seawater.   Do the same thing for the other coolers, clean, replace the gaskets on the HX, new anode, some paint if you want, put em back in.

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