What component is used to prevent a block camshaft from wearing on the block surface?

Technician A says a gear train or valve timing mechanism is used to coordinate the movement of the crankshaft with the camshaft and the valves. Technician B says the gear train does not operate power take-off (PTO) pumps. Who is correct?

Where should desired maximum cylinder pressure occur?

An advantage of the Navistar's Eco Motors EM100 engine is that it has __________ fewer parts than an equivalent four-stroke cycle engine.

On- and off-highway vehicle emissions from the 1970s to present have been reduced by __________.

Technician A says hydrocarbon emissions are formed because of fuel that have been burned completely. Technician B says fuels are classified as hydrocarbons because they are made of mostly hydrogen and carbon atoms. Who is correct?

Which of the following statements about carbon monoxide is correct?

Select one:

Technician A says blow-by is the leakage of air past the piston rings into the crankcase. Technician B says that in any engine, blow-by occurs mostly during the compression stroke. Who is correct?

What is another name for a core plug?

Advantages of compact graphite iron may include __________.

Which of the following is correct concerning cylinder block material?

Typically, induction hardening is effective to no more than __________ deep.

Which block design is one of the smoothest operating?

Technician A says plateau honing does not reduce engine oil consumption during break-in. Technician B says plateau honing does not reduce the time and distance required for engine break-in. Who is correct?

Technician A says plain bearings are best to achieve long engine life. Technician B says bearings fail when the oil film breaks down or when the bearing is overloaded. Who is correct?

An engine with the camshaft in the cylinder head will not require a __________

Technician A says one of the factors involved in the selection of cylinder head materials include the demand for lightweight engines. Technician B says traditional materials such as cast iron have not provided good strength and wear characteristics for valve train

mechanisms. Who is correct?

What is the temperature at which valve damage can occur?

A camshaft rotates __________ of crankshaft speed.

Improper service techniques when adjusting valve bridges could result in a bent __________.

Technician A says diesel engines are allowed very little removal of material from the cylinder head or block deck during resurfacing because machining will cause valve-to-piston interference. Technician B says while diesel engine cylinder heads are ruggedly built, they can be warped and cracked by incorrect liner protrusions. Who is correct?

Technician A says a traditional technique for clamping cylinder heads to the block requires the use of a torque wrench and a spiral pattern sequence for torquing the head bolts down in the correct sequence. Technician B says no more than generally 0.003" (0.0762mm) of warping is allowed on a cylinder head. Who is correct?

Which of the following statements about lubrication systems is correct?

When discussing lubrication systems, Technician A says that the lubrication system lubricates moving parts but cannot remove heat from the engine. Technician B says part of the lubrication system's job is to minimize corrosion of internal engine parts. Who is correct?

Motor oils are typically made up of __________ chemical additives.

Which of the following statements about common oil additives is correct?

A symptom of a plugged engine oil cooler is __________.

Oil pressure regulating valves operate by __________.

Which of the following statements about spin-on oil filters is NOT correct?

A propylene glycol anti-freeze concentration of 60% volume produces a freeze point protection of __________.

. Every 1 psi increase in cooling system operating pressure will increase the cooling system’s boiling point by __________ºF.

Technician A says cooled exhaust gas recirculation (EGR) places an even larger heat load on the cooling system. Technician B says engine modifications to deal with the increased heat loads include larger water pumps, cooling fans, and radiator cross-sectional areas.

Who is correct?

An environmentally friendly liquid coolant is __________.

Which of the following statements about types of coolant is correct?

Which of the following statements about anti-freeze formulation is correct?

What type of designation is associated with coolant dyed green?

A radiator cap vacuum valve failure is generally associated with a __________.

A coolant’s freeze point protection can be verified with a(n) __________.

Which is the recommended tool to verify a thermostatic fan clutch is operating properly?