Skip to main content

Reply to "DPUs and an SD80MAC on NS 10K"

I remember reading how EMD didn’t want a repeat of the serious issues that had plagued their first 645/20 i.e. crankshaft failures, excessive vibration and crankcase cracking are a few that I recall.  While the 710/20 is a direct descendant of the 645/20, there were significant improvements made to the crankshaft and crankcase to mitigate the previous issues.  One of the upgrades also included changing the firing order, something like over 60,000 different possible combinations to choose from in a 20-cylinder engine.  I remember being allowed to open the “Coffin covers” and observing the camshaft actuating the valves on an idling engine, very impressive, I think I still have the video I took of it somewhere.  From what some of you have said, it would appear EMD got it right.  

Last edited by PRR 5841

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

×
×
×
×
×