A.vent line
B.overflow line
C.feed line
D.sounding tube

A.Holding the valve open for a long period
B.Increasing the starting air pressure used
C.Opening the stating air valve quickly
D.Reducing the starting air valve size

A.corrosion fretting
B.insufficient lubrication
C.abnormal wear
D.fatigue failure

A.sludge
B.water
C.micro-organism growth
D.all of the above

A.burned exhaust valves
B.excessive spring compression
C.spring surge
D.worn valve seats

A.worn valve seats
B.worn main bearing
C.excessive valve clearance
D.weak rocker arm springs