I had my exhaust pipe break off just past the head and I didn't know it till I had quit washing. It might have ran for over 1 hour at near wide open. Could that have done valve damage causing loss of power? The motor sounds good but when I crank up the pressure it labors hard and the old power the pump used to deliver isn't there any more. I thought it was a pump problem and I cleaned the pump valves and unloader but still have the problem....I didn't think I could have damaged the motor so bad, sooo, I'm here asking for help from someone that knows more than I do. Thanks in advance.