Question 1

The harmonic balancer attaches to the rear of the crankshaft and is used to reduce vibrations.

Accepted Answer

The harmonic balancer attaches to the front of the crankshaft and is used to reduce vibrations.

Question 2

Technician A says that engine block cylinders are measured for taper. Technician B says that the piston rings typically cause the most wear in the middle of the cylinder. 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 engine block cylinders are indeed measured for taper to assess wear and ensure they are within manufacturer specifications. Technician B is incorrect because the most wear caused by piston rings usually occurs at the top of the cylinder where the combustion process exerts the most force and heat, not in the middle.

Question 3

What tools would be used to measure crankshaft warpage?
A) straightedge and feeler gauge
B) dial caliper and V-blocks
C) dial indicator and V-blocks
D) dial bore gauge and outside micrometer

Accepted Answer

Dial indicator and V-blocks are the most accurate and reliable tools for measuring crankshaft warpage. The dial indicator can detect the slightest deviations in the surface, and V-blocks provide a stable surface for supporting the crankshaft during measurement.

Question 4

Crankshaft journals are measured for all of the following EXCEPT ____.
A) taper
B) out-of-round
C) diameter
D) runout

Accepted Answer

Crankshaft journals are measured for taper, out-of-round, and diameter to ensure proper bearing clearance and to determine if they need to be reground. Runout, on the other hand, refers to the amount of wobbling or movement in the shaft as it rotates and is typically checked on the flywheel or flexplate mounting surface, not the journals.

Question 5

What does the process of line boring address?
A) cylinder imperfections
B) main bearing saddle problems
C) block deck sizing
D) lifter bore repair

Accepted Answer

Line boring is a process used to correct or align the main bearing saddle problems that may have occurred due to wear and tear over time. It involves enlarging the bore of the main bearing support and installing a new bearing sleeve to restore the proper alignment and function of the engine.

Question 6

Scratches in the deck of the block deep enough to catch your finger nail should be resurfaced.

Accepted Answer

Scratches in the deck of a block that are deep enough to catch your finger nail can trap debris and affect the accuracy of measurements. Resurfacing the deck will ensure a smooth and level surface for more precise measurements.

Question 7

Technician A says that when an engine block is bored, the original pistons must be replaced. Technician B says that a cylinder that is out-of-round may be repaired by boring. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

When an engine block is bored, the original pistons usually cannot be reused because the bore size has been increased, necessitating new pistons that match the new bore size. A cylinder that is out-of-round can indeed be repaired by boring it to a larger size and then using oversized pistons to match the new bore, making both Technician A and Technician B correct.

Question 8

Freeze plugs are placed in the sides of the block to protect it during freezing conditions by popping out and preventing cracks.

Accepted Answer

The answer of Freeze plugs are placed in the sides...

Question 9

Cylinder taper is being discussed. Technician A says taper does not affect the ring gap as the piston goes up and down. Technician B says that up to.010" (.254mm) is usually an acceptable amount of taper. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Cylinder taper can affect the ring gap as the piston moves up and down, contradicting Technician A's statement. Additionally, a taper of up to .010" (.254mm) is generally considered excessive and not acceptable, which contradicts Technician B's statement.

Question 10

Technician A says that when one cylinder is bored oversized, the others in the block must be bored to match. Technician B says that if only one cylinder is damaged, sleeving may be a more cost effective repair. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Both A and B are correct because if one cylinder is bored oversized, the others in the block must be bored to match to maintain proper compression and combustion. However, if only one cylinder is damaged, sleeving may be a more cost-effective repair than boring all of the cylinders.

Question 11

Most cylinder wear occurs in the middle of the cylinder.

Accepted Answer

Most cylinder wear occurs at the top of the cylinder where the piston changes direction, leading to higher pressure and temperature conditions that contribute to increased wear.

Question 12

Technician A says that if one main bearing journal is ground to the next undersize, all of the other main bearing journals must be cut to match. Technician B says that if a main bearing journal is worn below the limits of machining, an alternative may be welding up the journal and then grinding it back down to its original size. 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. Technician A is correct because for uniformity and balance, all main bearing journals should be machined to the same size if one is altered. Technician B is correct because welding up a worn journal and then machining it back to its original size is a viable repair method when a journal is too worn for standard machining.

Question 13

Modular design refers to the ability of the production plant to build the same design engine in different configurations.

Accepted Answer

Modular design allows for the production of the same engine design in various configurations for different applications, which can improve production efficiency and reduce costs.

Question 14

On V-type engines, if one deck is resurfaced, the other side should also be done to match.

Accepted Answer

Resurfacing only one side of a V-type engine deck can result in uneven compression and performance issues as the two sides will have different heights. It is recommended to resurface both sides to match and ensure uniformity.

Question 15

Interference parts are different size components that are precision fit so that a puller or press is necessary to remove or install.

Accepted Answer

Interference parts have tight tolerance and require a specialized tool to install or remove them.

Question 16

Sleeves can be installed to repair a damaged bearing journal in an engine block.

Accepted Answer

The answer of Sleeves can be installed to repair a...

Question 17

Main bearing bore alignment is measured with a dial indicator and a straightedge.

Accepted Answer

Main bearing bore alignment is typically measured with a dial indicator mounted on a special fixture or bridge that spans the bore, not with a straightedge. A straightedge is not precise enough for measuring the alignment of main bearing bores.

Question 18

A bedplate has all of the main caps cast as one unit.

Accepted Answer

A bedplate is a single piece of metal that contains all of the main bearing caps in one unit, which provides additional rigidity and stability to the engine block.

Question 19

Technician A says that main bearing caps are interchangeable. Technician B says that main bearing bores are checked for alignment with a straightedge and feeler gauge. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Technician A is incorrect because main bearing caps are not interchangeable. Each main bearing cap is matched to its corresponding main bearing journal and if they are mixed up, the engine will not run properly. 
Technician B is correct because main bearing bores should be checked for alignment with a straightedge and feeler gauge to ensure that the bearings will mate properly with the journals.

Question 20

Technician A says that resurfacing the deck of a block is usually done in an automotive repair shop. Technician B says that sleeves are installed after the block deck is resurfaced. 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 that resurfacing the deck...

Quiz 12: Engine Block Construction

The harmonic balancer attaches to the rear of the crankshaft and is used to reduce vibrations.

Technician A says that engine block cylinders are measured for taper. Technician B says that the piston rings typically cause the most wear in the middle of the cylinder. Who is correct?

What tools would be used to measure crankshaft warpage?

Crankshaft journals are measured for all of the following EXCEPT ____.

What does the process of line boring address?

Scratches in the deck of the block deep enough to catch your finger nail should be resurfaced.

Technician A says that when an engine block is bored, the original pistons must be replaced. Technician B says that a cylinder that is out-of-round may be repaired by boring. Who is correct?

Freeze plugs are placed in the sides of the block to protect it during freezing conditions by popping out and preventing cracks.

Cylinder taper is being discussed. Technician A says taper does not affect the ring gap as the piston goes up and down. Technician B says that up to.010" (.254mm) is usually an acceptable amount of taper. Who is correct?

Technician A says that when one cylinder is bored oversized, the others in the block must be bored to match. Technician B says that if only one cylinder is damaged, sleeving may be a more cost effective repair. Who is correct?