Interesting!....do you have pictures of your setup.?.....Was it a used EGR cooler you installed?...........I know in their application, hot exhaust gases pass through them and units could last as long as 80,000 miles.
I've seen prices for used DD15 ERG COOLERS for $600, but don't know what condition.........I get the principles behind their use just would like to know substituting ERG Coolers for the typical closed cooling
Shell & Tube heat exchangers are a way around the big cost?.......because ERG coolers go through tremendous heat exposure using a used one would be as gamble, but isn't everything when considered.

I used a second hand one. The environment is way easier than the environment on the DD15. They have 40 psi at 600 degreed going through them. The cooling is easily enough for a blown hand built 540 running 8psi. The build quality is way superior than a normal marine cooler. Easy to weld fittings on with a tig...Just get one chemically cleaned and pressure tested, and its ready to go...Jas

Hey Jas....I've seen one on ebay for $360 used & pressure checked ok...Boy, If I could convert these to my intention for closed cooling that would be great!.....We know how much the PPT & Monitor closed cooling kits cost...backordered & not available till spring.
I have twin 572 BBC's ....but before I jump in need to know how involved & labor intensive to build a system ....give me some confidence Jas!

Fwiw… I’m using factory Merc 454/502 coolers on my 600+ 509’s. My temps run right around 170-175 cruise and actually drops into the 160s when running harder. water temps upper 70’s to low 80’s.





There was a post from way way back where member VinnyP modified his 575 sci to use a factory heat exchanger. His 575 had been breathed on so I figured would work on mine. So far so good. This is a half system (exhaust is still raw water).

Curious about the EGR cooler.

Tom that's a nice setup, fits in well & doesn't look like a sore eye.....That being said, we all know how expensive these closed cooling kits are especially for twins......for me, it's all about the money.
maybe I'm watching Bad Chad too much, but if a cooler a 1/4 of the price can do the same job (2 posts back Jas says, detroit dd15 coolers can handle 600* at a much high pressure) easily I'm looking
into it.
it.

Here you go. Just need to weld some feet on the bottom to screw it down, add an inlet and an out let for the engine coolant, and it's all done. This is very easy... Jas

Here it is with the ends ready to be welded on

Picture is worth a 1000 W's ~ Jas, that is so cool!! ...A few questions, how did you disassemble the ends aren't they welded closed? .....and after cleaned tig welded close?
I'm sure there's a lot more involved, but let me keep asking, .The dd15 erg cooler pictured do you happen to know the model #?? ...I came across a Detroit diesel DD15 ERG
p/n A4731400175 - And another one p/n A4731400575......They look like yours, but don't know .....I give you the measurements in a couple if you don't mind.....thnx, Scippy

The dd15 erg cooler I'm looking at is ..32" long & 5"x 5" seems kinda large!

Serious question… If you’re welding up the ends, how do you take it apart to clean? Boiling and calling it good?

That's a Good question for ecuchips,, ... my question is how did he get the ends off? ....applied heat to a brazed or soldered end piece?...