Question 1

What tool would most likely be used to measure valve clearance?

Accepted Answer

Feeler gauge is the tool generally used for measuring valve clearance.

Question 2

Technician A says that a vacuum gauge measures the difference between intake manifold vacuum and atmospheric pressure. Technician B says that a vacuum gauge can help to diagnose worn piston rings. Who is correct?

Accepted Answer

Both technicians are correct. A vacuum gauge measures the difference between intake manifold vacuum and atmospheric pressure, which can be used to diagnose engine problems such as worn piston rings.

Question 3

Valve guide renewing is being discussed. Technician A says that the valve guide reamer is used first during any process. Technician B says that the three common methods for renewing the guide are knurling, inserts, and welding. Who is correct?

Accepted Answer

The answer of Valve guide renewing is being discussed. Technician...

Question 4

Technician A says that a cylinder bore gauge can be used to measure out-of-round. Technician B says that a cylinder bore gauge can be used to measure taper. Who is correct?

Accepted Answer

Both technicians are correct. A cylinder bore gauge can be used to measure out-of-round by taking multiple measurements along different planes and comparing them. It can also be used to measure taper by taking measurements at different points along the cylinder wall and comparing them.

Question 5

Technician A says that align boring is performed to straighten the cylinders of an engine block. Technician B says that a cylinder hone is used to deglaze a cylinder wall. Who is correct?

Accepted Answer

Align boring is actually performed to restore damaged main bearing bore alignments or to correct their size, not to straighten cylinders. Cylinder honing, however, is indeed used to deglaze cylinder walls, making Technician B correct.

Question 6

Flat rate pay gives the technician a salary that is paid each week according to how many hours they are present at work.

Accepted Answer

Flat rate pay is based on the jobs completed and not the number of hours worked. Technicians are paid a predetermined amount for each task they complete, regardless of the time it takes.

Question 7

What tool would be used to find a leak in the cooling system?

Accepted Answer

A cooling system pressure tester is used to find leaks in the cooling system by pressurizing the system and identifying any drops in pressure, indicating a leak. A coolant hydrometer measures the specific gravity of the coolant and is not used for diagnosing leaks. A cooling system vacuum tester is used to test for leaks in the vacuum lines of the cooling system, not for the coolant system. A coolant spectrometer is used to test the concentration of coolant and is also not used for diagnosing leaks.

Question 8

Technician A says that the best way to inspect drive belts made with EPDM is the three cracks in a three inch replacement rule. Technician B says that drive belts made with EPDM do not crack when they stretch and wear out. Who is correct?

Accepted Answer

Technician B is correct because EPDM (Ethylene Propylene Diene Monomer) belts do not show the traditional signs of wear like cracking. Instead, they wear down and may lose material without the visible cracking that was common with older belt materials. The "three cracks in a three-inch rule" does not apply to EPDM belts.

Question 9

Ring compressors are being discussed. Technician A says that ring compressors are used to remove piston rings on pistons. Technician B says that ring compressors are used when installing a piston into the block. Who is correct?

Accepted Answer

Ring compressors are used when installing a piston into the block. They hold the rings onto the piston as it is inserted into the cylinder bore, preventing the rings from catching on the edge of the bore and potentially damaging them. They are not used to remove piston rings. Therefore, only Technician B is correct.

Question 10

All DLC's on vehicles 1996 and newer can be found in the exact same location.

Accepted Answer

The location of the Data Link Connector (DLC) for vehicles 1996 and newer can vary depending on the make and model of the vehicle. It is commonly found under the dashboard on the driver's side, but its exact location can differ.

Question 11

Testing valve springs is being discussed. Technician A says that valve spring tension should be within 5% of specifications. Technician B says that dial-type spring tension gauges provide more accurate measurements than the ones that use torque wrenches. Who is correct?

Accepted Answer

The answer of Testing valve springs is being discussed. Technician...

Question 12

Outside micrometers are being discussed. Technician A says that on English system micrometers, sleeve markings are in .025 inch increments. Technician B says that on metric system micrometers, sleeve markings are in .005 millimeter increments. Who is correct?

Accepted Answer

Technician A is correct because on English system micrometers, the sleeve markings indeed represent .025 inch increments, which is a standard way of measuring with these tools. Technician B is incorrect because on metric system micrometers, the sleeve markings are typically in 0.5 millimeter increments, not .005 millimeter increments.

Question 13

The use of a smoke leak detector is being discussed. Technician A says that a smoke leak detector can be used to find exhaust leaks. Technician B says that to find vacuum leaks, the throttle opening must be blocked off. Who is correct?

Accepted Answer

Both technicians are correct. A smoke leak detector can be used to find exhaust leaks as well as other types of air leaks. To find vacuum leaks, the throttle opening must be blocked off to isolate the vacuum system and allow the smoke to pinpoint the location of the leak.

Question 14

How many places should you measure a cylinder to check for out-of-round?

Accepted Answer

Three places should be measured on a cylinder to check for out-of-round: the top, middle, and bottom. This provides a good representation of the entire cylinder's shape and any deviations from a perfect roundness.

Question 15

What tool would be best suited to measuring the movement of a component?

Accepted Answer

A dial indicator is the best tool suited for measuring the movement of a component as it provides a precise measurement of linear displacement or travel in a specific direction. Dial calipers are more suited for measuring distances, while runout gauges and feeler gauges are used to measure the degree of deviation in circular rotation or gaps between components, respectively.

Question 16

Technician A says an out-of-balance crankshaft must be replaced. Technician B says weight can be added or removed from a crankshaft journal to correct an out-of-balance condition. Who is correct?

Accepted Answer

The answer of Technician A says an out-of-balance crankshaft must...

Question 17

What would be used to measure the clearance between the main bearings and crankshaft?

Accepted Answer

Plastigage is the best choice to measure the clearance between the main bearings and crankshaft. Plastigage is a thin, thread-like plastic that is placed between the bearing and crankshaft journal. When the bearing cap is torqued down, the Plastigage is flattened and the width of the flattened material is measured with a scale provided on the Plastigage package. This measurement gives an accurate reading of the clearance distance. Dial calipers, aligning bars, and feeler gauges can all be useful for other types of measurements, but Plastigage is specifically designed for measuring clearance.

Question 18

What is used to display engine operating data from the PCM for the technician?

Accepted Answer

A scan tool is specifically designed to display engine operating data from the PCM in a format that technicians can easily read and interpret. A DVOM, oscilloscope, and analog meter may be useful for other diagnostic purposes, but they are not designed to display PCM data.

Question 19

A fuel pressure gauge would be used to find a fault in all of the following EXCEPT the ____.

Accepted Answer

A fuel pressure gauge is used to measure the pressure of fuel delivery from the fuel pump to the engine. A fault in the fuel tank cap would not result in a change in fuel pressure, so a fuel pressure gauge would not be useful in detecting this issue.

Question 20

Which tool(s) are used to determine if a crankshaft straight?

Accepted Answer

The most common and accurate method for determining if a crankshaft is straight is by using V-blocks and a dial indicator. The V-blocks hold the crankshaft in place and allow it to spin freely, while the dial indicator measures any deviations in runout. This method is widely accepted as the standard for crankshaft inspection.

Quiz 2: Engine Repair and Rebuilding Industry