I was admiring my grandpa's John Deere 5203 tractor today and saw this. I'm pretty sure that's the throttle connected to the spring-hinge, so I'm guessing it's some kinda fuel injection. However, I know diesel engines strictly introduce fuel in the cylinder. So what is it, and what is its function? Thanks
This absolutely is the high pressure fuel injection pump for the diesel engine. I cannot tell for sure, but it looks as though this is a three cylinder engine (?) as I can only see two fuel lines coming out the right side of the injector pump. I'm assuming the third one is on the back side of this, behind the fuel line coming from the fuel tank (larger line in the middle). (NOTE: Actually, now that I'm looking closer, I can see the three lines which are linked together on the side of the block going upwards away from the pump.)
