1 page 1 Models J08C-TP and J08C-TR 3-1-12 ENGINE Symptom Possible cause Remedy/Prevention Unusual engine noise ............... Retighten or replace Intake valve seating is not concentric ........... Replace or correct the valve and valve seat crankshaft pulley .................................... Lubricate Worn timing gear........................................... Replace the timing gear Breakage of turbine or blower ....................... Refer to TURBOCHARGER in CHAPTER 51 NOTE: The items on this page concern unusual engine noise which is due to causes other than those given for diesel knock. Various other parts