Engine Repair 2 Pre-test

Which of the following statements is true with respect to a rotary engine? Select one:

• The rotor is mounted in a cylindrical housing.

• There is no reciprocating motion.

• The engine produces one power pulse per rotor rotation.

• The engine produces more vibration when compared to other ICEs.

With a(n) (a)   , instead of mixing the fuel/air in the intake manifold, it mixes in the combustion chamber. Select one:

• Oval combustion chamber

• Wedge combustion chamber

• Gas direct injection cylinder head

• Bathtub combustion chamber

The overhead cam engine system is more complicated than the OHV engine due to the need for enhanced oiling at the top of the engine for the . Select one:

• Lifters

• Followers

• All the above

• Camshaft

(a)   is a measure of the amount of pressure the valve spring is exerting to overcome the inertia of the valve train as the valve reaches its fully opened position. Select one:

• Valve spring closed pressure

• Valve spring open pressure

• Valve spring retainer pressure

• Valve float pressure

All the statements below are true EXCEPT: Select one: a. The timing of the valves is controlled by the physical shape and position of the cam lobes on the cam shaft. b. Racing engines are designed to minimize the effect of the column inertia encountered at higher rpm. c. Valve timing is critical to the proper operation of the ICE. d. On variable valve timing engines, the valve timing can be modified to provide the best operating conditions.

• The timing of the valves is controlled by the physical shape and position of the cam lobes on the cam shaft.

• Racing engines are designed to minimize the effect of the column inertia encountered at higher rpm.

• Valve timing is critical to the proper operation of the ICE.

• On variable valve timing engines, the valve timing can be modified to provide the best operating conditions.

Tech A says that valve overlap occurs between the exhaust stroke and the intake stroke. Tech B says that valve overlap occurs to assist in scavenging the cylinder. Who is correct?

• Tech A

• Tech B

• Both A and B

• Neither A nor B

Technician A says that when the lifter is on the base circle of the cam lobe, the valve is closed. Technician B says that the cam-in-block lifter rides directly against the valve. Who is correct?

• Technician A

• Technician B

• Both A and B

• Neither A nor B

Which of the following is NOT a style of pushrod end? Select one:

• a. Ball to ball

• b. Cup to adjustable tip

• c. Ball to adjustable tip

• d. Ball to cup

When oil inside of an engine's valve cover penetrates the edge of the valve cover gasket material, it may be designed to swell by approximately ____. Select one:

• 10%

• 20%

• 30%

• 40%

If the piston skirt is worn, the piston may make a knocking noise referred to as "piston slap" due to ________. Select one:

• insufficient lubrication in the engine
• a damaged connecting rod
• increased clearance between the piston and the cylinder wall
• excessive oil pressure in the cylinder