smokinwrench
01-16-2010, 01:18 AM
Worked on my first emd today, same engine as what is in older trains. It is on a skid with a 2.7 megawatt generator as a black start unit at one of a power plants. It is a V20, 645 cubic inches per cylinder. Sent me up to find out why it was building crankcase psi when it should run it a vacuum. Found the problem scored liners.
The cool thing was this engine has rotating pistons, every time the piston goes down as it starts back up it rotates a tiny bit, to keep from getting deep scoring on the pistons and liners. I was just amazed by it, 3 of us that work here have big engine experience on all different brands and no one had ever heard of a rotating piston. Probably boring to most of ya but being a gear head I was amazed by it.
The cool thing was this engine has rotating pistons, every time the piston goes down as it starts back up it rotates a tiny bit, to keep from getting deep scoring on the pistons and liners. I was just amazed by it, 3 of us that work here have big engine experience on all different brands and no one had ever heard of a rotating piston. Probably boring to most of ya but being a gear head I was amazed by it.