Deck 37: Engine Assembly and Dynamometer Testing

Question 1

About how much of the turning torque applied to a head bolt is lost to friction?

A)40%
B)20%
C)80%
D)60%

Answer 1

80%

Question 2

Service information states SAE 30 engine oil should be used on the threads of the head bolts, before installation and torquing. Technician A says that SAE 5W-30 will work. Technician B says that SAE that 10W-30 will work. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Answer 2

Neither technician A nor B

Question 3

Technician A says that the torque applied to the head bolts is the same as the clamping force on the gasket. Technician B says that the clamping force is the force actually applied to the surfaces of the gasket. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Answer 3

Technician B only

Question 4

A coating often used to keep an engine from rusting during assembly is called ________.

A)Penetrating oil
B)Engine oil
C)Assembly lube
D)Fogging oil

Question 5

Head gasket installation is being discussed. Technician A says that the surface finish of the cylinder head or block deck is very important for proper sealing to occur. Technician B says that if "front" is marked on a head gasket, the mark should be installed near the accessory drive belt end of the engine. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 6

Technician A says that studs should be installed finger tight. Technician B says that studs must be installed using a thread locker such as Locktite. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 7

What can be used to check that the heads are at the correct angle for the intake manifold on a V-type engine?

A)A tape measure
B)A metal rule
C)An angle gauge
D)A dial indicator

Question 8

Which of these is TRUE about checking bearing clearances using Plastigage?

A)The cap should be torqued to factory specifications
B)The wider the strip means the narrower the oil clearance
C)The journal should be clean and oil free
D)All of the above

Question 9

An engine dynamometer measures ________.

A)Horsepower
B)Fuel economy
C)Torque
D)Both horsepower and torque

Question 10

If the torque and horsepower readings are graphed, where do the curves cross (equal each other)?

A)At 5,252 RPM
B)Never
C)At peak horsepower, which can vary from engine to engine
D)At peak torque, which can vary from engine to engine

Question 11

What can happen if gasket surfaces are too smooth?

A)Nothing will happen
B)Gasket can move out of proper location, causing leakage
C)Gasket will not be able to seal the deep grooves in the surface
D)Gasket will seal with no leaks

Question 12

Technician A says that glues are used to help gaskets seal. Technician B says that deburring all sharp edges is an important step that has to be done to achieve proper engine assembly. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 13

What would happen if oil or water (coolant) was at the bottom of a dry hole in the bolt when the head bolts are installed and torqued?

A)Block could crack
B)Liquid would be forced upward and out of the hole
C)Bolt would break
D)Either B or C

Question 14

Two technicians are discussing the torqueing procedure for head bolts. Technician A says that they should be tightened starting at the center of the head and working toward the ends. Technician B says that they should be tightened in three steps or according to the factory specified manner if torque-to-yield or torque-angle. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 15

Technician A says that the back of all engine bearings should be lubricated during assembly. Technician B says that the face of the main and rod bearings should be lubricated before final assembly. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 16

Engine pre-oiling is recommended for which of these reasons?

A)Helps the rebuilt engine develop power
B)Fills the oil passages with oil prior to initial start-up
C)Both A and B
D)Neither A nor B

Question 17

For high performance use, most experts recommend the use of ________ instead of standard bolts.

A)Nuts
B)Prevailing torque bolts
C)Lag bolts
D)Studs

Question 18

An engine block is being fitted with studs. Technician A says that the tightening torque in the installation instructions is for the stud and not the nut. Technician B says that if a thread locker is used, be sure to immediately install the main bearing caps before the compound cures to help avoid misalignment. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 19

Technician A says to be sure the piston notch "front" or arrow points toward the front of the engine. Technician B says to be sure that the piston ring gaps all line up before installing the piston.. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 20

Technician A says that all oil galleries must be thoroughly cleaned before engine assembly can begin. Technician B says that all expansion cups and plugs should be installed with a sealer to prevent leaks. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 21

Technician A says that the cam bearings should be installed using a driver and dead blow hammer.Technician B says that main bearings and rod bearings should be checked for proper oil clearance by measuring the crankshaft journals and inside diameter of bearings. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 22

The most common cause of premature bearing failure is ________.

A)No lubrication
B)Dirt
C)Overloading
D)Misalignment

Question 23

Typical thrust bearing clearance is ________.

A)0.025 to 0.035
B)0.001 to 0.003
C)0.050 to 0.100
D)0.002 to 0.012

Question 24

Piston ring end gap can be increased by ________.

A)Filing the ring to make gap larger
B)Sleeving the cylinder
C)Knurling the piston
D)Installing oversize rings

Question 25

The cylinder head bolts should be tightened (torqued) by which of these sequences?

A)Starting at the front of the engine and torqueing bolts from front to rear
B)Four outside bolts first, then from the center out
C)From the outside bolts to the inside bolts
D)From the inside bolts to the outside bolts

Question 26

The TTY method of tightening bolts involves which of these processes?

A)Turning bolts a specified number of degrees after initial torque
B)Turning all bolts the same number of turns
C)Torqueing to specifications and loosening by a specified number of degrees
D)Torqueing to one-half specifications, then to three-quarter torque, then to full torque

Question 27

Turning the oil pump before starting the engine should be done for all of these reasons, EXCEPT ________.

A)To get the distributor in the right position
B)Supply oil to the camshaft
C)Lubricate valve train components
D)Lubricate engine bearings

Question 28

Cam bearings should be installed ________.

A)Dry
B)Oiled
C)With 0.100 inches of crush
D)Both B and C

Question 29

Technician A says that the piston and rod assembly should be installed in the cylinder after being carefully fitted for each bore. Technician B says that connecting rod side clearance should be checked with a feeler (thickness) gauge. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 30

Main bearings and rod bearings should be checked for proper oil clearance by precision measuring the crankshaft journals and inside diameter of bearings, or by using which of these?

A)Plastigage material
B)Steel ruler
C)Rubber gauging material
D)Vernier caliper

Question 31

Technician A says oil that pressure should be tested before installation of the engine in the vehicle. Technician B says that some cylinder heads use the torque-to-yield method, where the head bolts are tightened to a specified torque and then rotated an additional specified number of degrees. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 32

A engine dynamometer is used to measure engine ________.

A)Horsepower
B)Weight
C)Mass
D)Torque

Question 33

An engine dynamometer may use devices to convert pressure and temperature signals into electronic signals. These devices are called ________.

A)Transducers
B)Reducers
C)Reversers
D)Inverters