When you say "getting tired" are there specific symptoms? Or is it just old? I have the same generator
that was installed in 1996 and has 8100 hours, and runs like a top. But it has received 20 years of compulsive preventative maintenance
The concern I'd have is if the diesel
is running out of life, do you know that the electrical
side of the unit is in better shape?
But assuming you are really hearing your diesel's death rattle, this is not a simple job, and the generator
side of the unit has it's own issues with age and hours. If you know it has been maintained and is in better shape than the diesel
, there is a shop manual available.
This should get you started: