Question 1

All of the following are correct statements about lifters EXCEPT:
A) Flat bottom [nonroller] lifters rotate in their bores
B) Roller lifters do not and should not rotate in their bores
C) The lobes on a camshaft designed for roller lifters may have a steeper ramp and a blunt nose
D) All engines equipped with roller lifters require periodic valve [lash] adjustment

Accepted Answer

All engines equipped with roller lifters do not require periodic valve adjustment, as the roller lifters do not wear and change in dimensions like flat bottom lifters.

Question 2

Technician A uses a micrometer to measure the connecting rod journal for taper. Technician B uses a micrometer to measure the connecting rod journal for out-of-roundness. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

Both technicians are correct as a micrometer can be used to measure both taper and out-of-roundness of a journal.

Question 3

Technician A says piston ring grooves should be cleaned with a piston ring groove cleaner. Technician B says piston ring grooves should be cleaned with a broken piston ring. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

The answer of Technician A says piston ring grooves should...

Question 4

Technician A checks crankshaft endplay or end clearance with a feeler gauge. Technician B uses a dial indicator. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

The answer of Technician A checks crankshaft endplay or end...

Question 5

Technician A installs a cup-type core plug with its flanged edge inward. Technician B hits the center [crown] of a dished-type core plug with a hammer to flatten and expand the plug for a tight fit. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

The answer of Technician A installs a cup-type core plug...

Question 6

Technician A says that the oil pump is driven directly by the crankshaft. Technician B says on some older engines the oil pump is driven by the distributor. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

Both statements are correct. The oil pump can be driven directly by the crankshaft in many engine designs. In some older engines, the oil pump is indeed driven by the distributor, which in turn is driven by the camshaft or directly by the engine's gear train.

Question 7

Technician A says a piston pin is sometimes called a wrist pin. Technician B says the piston pin is always centered in the piston. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

The piston pin is indeed commonly referred to as a wrist pin, which is why Technician A is correct. However, Technician B's statement that the piston pin is always centered in the piston is not accurate, as the positioning can vary depending on the engine design and the desired piston motion characteristics.

Question 8

A degree wheel is used to _____.
A) adjust camshaft timing on a performance camshaft
B) resurface the cylinder deck surface
C) align the crankshaft to the cylinder bores
D) install the oil pump

Accepted Answer

A degree wheel is a measuring tool used to accurately set and adjust camshaft timing on a performance camshaft. It helps to determine the exact position of the camshaft in relation to the crankshaft and allows for precise adjustments to be made for optimal engine performance.

Question 9

Which operation must be performed before removing the pistons from an engine?
A) Install rod bolt protector sleeves
B) Remove the cylinder ridge with a ridge reamer
C) If the connecting rods are not marked from the factory, number the rods with a prick punch or number stamp
D) All answers are correct

Accepted Answer

All the operations listed are necessary steps to ensure the pistons can be safely and effectively removed from an engine without causing damage to the components.

Question 10

Technician A says engine blocks are made from cast iron. Technician B says engine blocks are made from aluminum. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

Engine blocks can be made from both cast iron and aluminum, depending on the design and application requirements.

Question 11

Which of the following is NOT a core plug design?
A) disc-type
B) cup-type
C) expansion-type
D) contraction-type

Accepted Answer

Contraction-type is not a recognized core plug design. The other options are common types of core plugs used in engines.

Question 12

Which of the following is NOT a type of camshaft drive mechanism?
A) shaft
B) gear
C) chain
D) belt

Accepted Answer

A shaft is not a type of camshaft drive mechanism as the camshaft itself is already a type of shaft. The other options, gear, chain, and belt, are all common types of camshaft drive mechanisms.

Question 13

What tool is required to remove a dished-type core plug?
A) vise grips
B) Allen socket
C) three-jaw puller
D) slide hammer

Accepted Answer

A slide hammer is the correct tool for removing a dished-type core plug, as it allows for the plug to be pulled out without causing damage to the surrounding area.

Question 14

Technician A says the maximum amount of cylinder out-of-roundness allowed in most cases is 0.0015 in. (.038 mm). Technician B says that a cylinder can have a taper of up to 0.010 in. (.254 mm) and be acceptable. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

Technician A is correct because the maximum allowable cylinder out-of-roundness for most engines is indeed around 0.0015 inches (0.038 mm). Technician B's statement is incorrect because a cylinder taper of up to 0.010 inches (0.254 mm) is generally considered excessive and would likely require machining or replacement of the cylinder.

Question 15

A cylinder bore can be checked for out-of-roundness with a _____.
A) dial bore gauge
B) telescoping gauge and micrometer
C) both "dial bore gauge" and "telescoping gauge and micrometer"
D) neither both "dial bore gauge" nor "telescoping gauge and micrometer"

Accepted Answer

Both a dial bore gauge and a telescoping gauge with a micrometer can be used to check a cylinder bore for out-of-roundness. The dial bore gauge provides a direct reading of the bore's diameter, while the telescoping gauge requires a micrometer to measure the distance between its arms after being set to the bore's diameter.

Question 16

A full floating piston pin _____.
A) rotates in the piston
B) rotates in the connecting rod
C) both "rotates in the piston" and "rotates in the connecting rod"
D) neither both "rotates in the piston" nor "rotates in the connecting rod"

Accepted Answer

A full floating piston pin is designed to rotate freely in both the piston and the connecting rod, allowing for better distribution of wear and reducing stress on the components.

Question 17

All the following are types of oil pumps except _____.
A) rotor
B) crescent [trochoidal]
C) gear
D) centrifugal

Accepted Answer

Centrifugal pumps are not used as oil pumps.

Question 18

Technician A says that a cylinder wall with too smooth a surface will prevent the piston rings from seating properly. Technician B says a cylinder wall should have a crosshatch honing pattern. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

A smooth cylinder wall can indeed prevent piston rings from seating properly, and a crosshatch honing pattern is necessary for proper lubrication and ring seating.

Question 19

Two technicians are discussing undersized bearings. Technician A says a 0.001 in. or 0.002 in. bearing can be used on a stock crankshaft journal if the oil clearance [difference between the bearing diameter and the journal diameter] is slightly excessive and the journal is not excessively tapered or out of round. Technician B says 0.010 in., 0.020 in., and 0.030 in. undersized bearings are only used when the crankshaft journals have been reground. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

Technician A is correct because using slightly undersized bearings can compensate for excessive oil clearance without the need for crankshaft regrinding, provided the journal's condition is within acceptable limits. Technician B is also correct because bearings that are 0.010 in., 0.020 in., and 0.030 in. undersized are typically used when the crankshaft journals have been reground to restore proper clearances and journal surface conditions.

Question 20

Pistons for modern engines are made of _____.
A) cast iron
B) aluminum
C) titanium
D) steel

Accepted Answer

Modern engines require pistons that are lightweight and can handle high operating temperatures. Both cast iron and steel are too heavy, while titanium is expensive and difficult to work with. Aluminum is the best choice as it is lightweight, durable, and has good thermal conductivity.

Quiz 11: Lower End Theory and Service

All of the following are correct statements about lifters EXCEPT:

Technician A uses a micrometer to measure the connecting rod journal for taper. Technician B uses a micrometer to measure the connecting rod journal for out-of-roundness. Who is correct?

Technician A says piston ring grooves should be cleaned with a piston ring groove cleaner. Technician B says piston ring grooves should be cleaned with a broken piston ring. Who is correct?

Technician A checks crankshaft endplay or end clearance with a feeler gauge. Technician B uses a dial indicator. Who is correct?

Technician A installs a cup-type core plug with its flanged edge inward. Technician B hits the center [crown] of a dished-type core plug with a hammer to flatten and expand the plug for a tight fit. Who is correct?

Technician A says that the oil pump is driven directly by the crankshaft. Technician B says on some older engines the oil pump is driven by the distributor. Who is correct?

Technician A says a piston pin is sometimes called a wrist pin. Technician B says the piston pin is always centered in the piston. Who is correct?

A degree wheel is used to _____.

Which operation must be performed before removing the pistons from an engine?

Technician A says engine blocks are made from cast iron. Technician B says engine blocks are made from aluminum. Who is correct?

Which of the following is NOT a core plug design?

Which of the following is NOT a type of camshaft drive mechanism?

What tool is required to remove a dished-type core plug?

Technician A says the maximum amount of cylinder out-of-roundness allowed in most cases is 0.0015 in. (.038 mm) . Technician B says that a cylinder can have a taper of up to 0.010 in. (.254 mm) and be acceptable. Who is correct?

A cylinder bore can be checked for out-of-roundness with a _____.

A full floating piston pin _____.

All the following are types of oil pumps except _____.

Technician A says that a cylinder wall with too smooth a surface will prevent the piston rings from seating properly. Technician B says a cylinder wall should have a crosshatch honing pattern. Who is correct?

Pistons for modern engines are made of _____.