Automotive Chapter 15

What type of camshaft drive arrangement is commonly used in heavy-duty, cam-in-block engines where the crankshaft is close to the camshaft? A. Timing gears. B. Timing belt and sprockets. C. Timing chain and sprockets. D. Vacuum-controlled valves.

A. Timing gears.

A timing belt drive mechanism consists of all of the following parts except _____. A. an oil slinger B. the crankshaft sprocket and camshaft sprocket(s) C. a cogged rubber drive belt D. a belt tensioner

A. an oil slinger

A(n) _____ prevents oil leakage between the crankshaft and the front cover. A. front oil seal B. oil slinger C. spray foam liner D. All of the above

A. front oil seal

_____ occurs when the timing chain flaps back and forth because of excessive slack in the chain. A. Chain runout B. Chain slap C. Chain pull D. Chain squeal

B. Chain slap

What is used in an engine to avoid crankshaft torsional vibration? A. Flywheel. B. Harmonic balancer, or vibration damper. C. Timing chain tensioner. D. Camshaft phaser.

B. Harmonic balancer, or vibration damper.

What drives an auxiliary chain if it is installed on the front of an automotive engine? A. The crankshaft timing chain sprocket. B. An electric motor attached to the front of the engine. C. An extra sprocket, typically placed in front of or behind the crankshaft timing chain sprocket. D. A camshaft phaser

C. An extra sprocket, typically placed in front of or behind the crankshaft timing chain sprocket.

Which of the following parts is not included in a variable camshaft timing system? A. Powertrain control module. B. Camshaft phaser. C. Piston and connecting rod assemblies. D. Engine speed sensor.

C. Piston and connecting rod assemblies.

An engine front cover bolts to the front of the _____. A. cylinder head B. engine block C. crankshaft D. camshaft

C. crankshaft

The crankshaft _____ operate(s) belts for the alternator, water pump, air conditioning compressor, and other units. A. rod journals B. flywheel C. pulley D. main thrust bearing

C. pulley

A timing belt may also be used to drive the _____. A. diesel injection pump B. water pump C. oil pump D. All of the above.

D. All of the above.

All of the following statements about timing belt tensioners are true except _____. A. it pushes inward on the back of the timing belt B. some use both spring tension and hydraulic pressure to maintain belt tightness C. the tensioner wheel is mounted on an antifriction bearing that is filled with grease D. camshaft phasers replace the belt tensioner in DOHC engine designs

D. camshaft phasers replace the belt tensioner in DOHC engine designs

All of the following are types of camshaft drives except _____. A. timing gears B. timing belt and sprockets C. timing chain and sprockets D. vacuum-controlled valves

D. vacuum-controlled valves

True or False? A chain guide may be used to take up the slack in the chain as it and the sprockets wear

False

True or False? A variable camshaft lift and duration system shifts the cam followers to ride on different cam lobe profiles.

True

_ True or False? A timing belt cover is normally made of sheet metal or plastic.

True