单项选择题

Which of the following problems is the main source of fuel pump and injection system malfunctions?（）

A.Improper lubrication
B.Air in the fuel system
C.Coated fuel lines
D.Excessive vibration

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单项选择题

Which of the following faults would allow lube oil to enter the cooling system of a diesel engine?（）

A.Excessive valve train lubrication
B.Leaking standby oil cooler core
C.Excessive lube oil pressure
D.Excessive lube oil in the system

单项选择题

Problems with the diesel engine fuel injection pump are usually caused by（）

A.improper adjustment
B.contaminated fuel
C.kinked fuel lines
D.excessive engine vibration

单项选择题

Diesel engine cylinder head test cocks are used to（）

A.check cylinder lubrication prior to starting engine
B.connect exhaust gas analyzers to determine engine efficiency
C.pressure test cylinder heads to check for leaks
D.remove moisture accumulations from cylinder prior to starting