Originally Posted by HurstBros0:
We have had the impellers come loose on the water pump before and cause an issue like this. They will be tight cold. As the engine heats up it starts slipping until no circulation happens. Get you a new impeller from Speedy Bill and if the drive side isn`t welded to the shaft ( early KSE were pressed ) , weld it to the shaft. Since the concrete is on the left side , this would leave less standing water to dissipate heat. Hope this helps.
Thanks Dan, I just might try that. The motor never over-heats so we never really thought it was a pump issue.