Troubleshooting Kohler 5E Gen set

Tpartridge

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Hi all...working on gen set on my 330, it stopped pushing water out exhaust. I confirmed hoses clear from seacock all the way to water pump. I took off the water pump cover plate and inspected the impeller which looked good so, I greased it, put it back in and closed everything up. Fired her up and still not pushing water.

Before I start to work on flushing heat exchanger, is there anything else I might be missing to look at first? Just trying to save some head, body and finger damage working in that compartment. :-)
 
Just because the impeller looks good, doesn't mean it's spinning. Dig deeper and take a look at the condition of the yellow drive sleeve behind the impeller.
 
Just because the impeller looks good, doesn't mean it's spinning. Dig deeper and take a look at the condition of the yellow drive sleeve behind the impeller.
Thanks, this was the issue. Replaced the drive sleeve and all is well. Appreciate the guidance.