Reasons for FUEL HEADER VIBRATION in HHP locos

FUEL HEADER VIBRATION 
a) CAM GEAR VIBRATION. 
b) FAULTY INJECTOR. 
c) IMPROPER ENGINE TIMING. 
d) IMPROPER RACK SETTING. 
e) IMPROPER FITMENT OF COUNTER WEIGHTS (OSTA+CAM GEAR END). 
f) IMPROPER ENGINE ALIGNMENT & COMPRESSOR ALIGNMENT. 
g) CAM SHAFT BREAKAGE. 
h) GEAR TRAIN COMPONENTS FAILURE. 
i) SLACK ENGINE FOUNDATION BOLTS. 
j) DEFECTIVE POWER ASSEMBLIES.