Kohler generator overheat issues?

CurrentObsession

Petty Officer 1st Class
Joined
Aug 26, 2011
Messages
221
1999 kohler 7.3e

Overflow bottle on the side goes from empty to full back to empty within minutes of running and shutting down.

Recently installed new impeller and coupling and radiator cap. Removed and confirmed the thermostat opens at 165 degrees and the heat exchanger is flowing well. Replaced antifreeze with new 50/50 premix.

Mechanic I spoke with says there is a pressure relief cap on top of the unit that helps burp the coolant and even showed me one in his shop but my unit does not have anything similar that I can find.
 

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Grub54891

Vice Admiral
Joined
Jun 17, 2012
Messages
5,946
Well, your cap is pretty rough looking. I’d replace that. All the ones I’ve worked on had a small plug that you had to take out on that raised area to burb any remaining air out of the tank. In my opinion, poor design. If it wasn’t burped the set would shut down.
 
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