[TeamPunisher]

Lost a generator water pump on our first long trip, was able to get it fixed a day later, then genset ran fine for a couple days.
 Then early one morning it made some noises and shut down. It will re start, runs up to rpm, then slows to an idle then shuts down again.. 
Engine sounds fine, there was a round piece of plastic in generator compartment, and black dust around head unit.. 
Can I be lucky and just need brushes or something? I'm a mechanic, but not familiar with gensets.
I tried calling martin but no response yet.

What are the experts thoughts on keeping this old unit going vs. updating to something newer?