FOUR-STROKE ENGINE: COMPONENTS & OPERATION ASSESSMENT 2

Overheating of a liquid-cooled engine may be caused by which of the following?

• Water mixed with antifreeze

• Internal coolant flow blockage

• Thermostat opening too early

• Having the proper level of coolant

Which of the following are two functions of piston rings?

• Hold combustion pressure in and transfer heat from the cylinder wall to the oil

• Transfer heat from the piston to the cylinder wall and hold in combustion pressure

• Retain as little oil as possible in the crankshaft and keep the piston centered in the cylinder

• Make sure the wrist pin does not fall out and keep the piston in line

A great percentage of heat generated escapes through which of the following?

• Intake

• Cylinder

• Radiator

• Exhaust

Which of the following regulates the timing of the opening and closing of the exhaust valve?

• Rocker arm

• Lifter

• Pushrod

• Camshaft

Overheating of an air-cooled engine is NOT likely caused by which of the following?

• Improper mixture of coolant

• Obstructions on the flywheel fins

• Damage to the external cooler

• Blockage of air intake screen

Which of the following is true about hydraulic lifters?

• Are designed to be used on any camshaft

• Require no routine maintenance

• Do not use engine oil to operate the valvetrain

• Have no moving parts

Coolant is commonly known as which of the following?

• Thermal energy

• Blended mixture

• Antifreeze

• Water

Which of the piston rings is located in the top groove on the piston?

• Compression ring

• Scraper ring

• Wiper ring

• Oil control ring

Which of the following are used to increase the surface area in which air can act upon in an air-cooled engine?

• Shrouds connected to the exhaust

• Thermostats with coolant

• Check valves which act as vents

• Metal fins which cover the outside of the cylinders

Which of the following can be used to determine the stroke of the engine?

• Speed of the camshaft multiplied by three

• Distance from the top of the piston to the bottom of the piston, multiplied by four

• Distance from the centerline of the crankshaft to the centerline of the connecting rod journal, multiplied by two.

• Speed of the mechanical link, multiplied by three