I have a 2003 KX121-3 Kubota excavator that's making an engine noise ( sounds like it's coming from injector pump ) loses power and exhaust blue smoke. It operates as it should no noises plenty of power until engine temperature reaches 160 degrees. Any load on hydraulics will make the noise louder. What I have done so far is, removed fuel tank and cleaned it, replaced all fuel hoses and replaced fuel filter.