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Fantastic! Thank you!

What is the name of this part? It's leaking and I need to find a gasket! Its on a 1994 D640 engine

Here is what I have today. Belt is tight, grounds are cleaned and reconnected. Battery cables removed, cleaned and connected 1) Battery volts before cold start up.... 13.2 V 2) I started it and let it run wide open for 5 minutes....Volts at battery were then 14.83 3) After 15 minutes of wide...

I'll do some more investigating tomorrow. Thank you guys for all of the replies!

Well, I'm getting those ACV readings at wide open throttle and at idle. I was told it should be 20 to 24. The DC volts at the battery (while running 3/4 throttle) is about 13.2 at start up and then climbs slowly to 15 or more. When I'm mowing...the battery light will flicker, and eventually...

With my volt meter set on AC Volts, and touching the 2 wires from the dynamo, I am getting a readout of 16.6 at wide open throttle, and 11.2 at idle. Am I correct in thinking that I need a new dynamo?

Thanks for the reply, D2Cat! It will be repaired later today!

Another pic. Looks to me like it's about ready to let go!

I picked up a little tractor with a D640 in it, and I have found this. I am assuming these parts are severely worn, and NOT suppose to look like this. Correct? I am planning on repairing on replacing the parts.