RUMORED BUZZ ON CAT D3B ENGINE

I also have a 455D crawler loader/backhoe (to start with cousin on the 450C), HLR Powershift transmission with manual clutch. Every is about twenty five years old and it has about 6000hrs.i just purchest a d3b & have the exact challenge with theleft pedal sticking i will try oil to-morrow . i have a matter. can it be regular for the loud deisel kno