EGR cooler measurements

Studs out, it's about 24 cm flange to flange, 31 cm diagonally, flange to end of bypass coolant pipe going down, 22 cm between the ends of the up and down coolant pipes, 11 or 12 cm across.

 

Just in case you opt to cork one end and fill it with solution of some sort:

Intake opening diameter (at exhaust): 20.9 mm
exit opening diameter (at EGR valve): 25.7 mm

A #4 stopper works nicely for me with that 20.9 mm dimension, but you'd want to verify dimensions; I'm not sure stopper size numbers are universal.

Out of interest: would it be possible (if you had corked one end and poured a solution in), to clamp it with "something" that would ultrasonic vibrate it?

 

I looked into that very thing when I was deciding how to best clean the EGR cooler.

Ultrasonic transducers are available that could be clamped to the side of the EGR cooler, however, you'd need to fill the coolant jacket that surrounds the EGR cooler core for this to work better.

I'd imagine that the transducer would be more efficient if it was working on a completely fluid filled cooler, instead of a liquid filled core surrounded by an air filled jacket around it.

I tried clamping my multitool (Festool clone) on the cooler and running (with no blade attached) to vibrate the EGR cooler with drain cleaner in it. It was only marginally effective.

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