Question 1

While discussing an in-vehicle engine repair, Technician A says that sometimes the engine mounts need to be loosened to remove the oil pan. Technician B says that sometimes the oil pump must be unbolted in order to remove the oil pan. Who is right?

Accepted Answer

Both technicians are correct in their statements. In some vehicles, the engine mounts may need to be loosened to provide enough clearance to remove the oil pan. And in some cases, the oil pump may be mounted inside the oil pan, requiring it to be unbolted before the pan can be removed.

Question 2

Technician A says that the ring ridge does not need to be removed if the pistons come out of the block easily. Technician B says that when installing a flywheel ring gear, heat it until it is red hot. Who is right?

Accepted Answer

Technician A is incorrect because the ring ridge should always be removed to prevent damage to the new piston rings during installation, regardless of how easily the old pistons are removed. Technician B is incorrect because heating a flywheel ring gear until it is red hot can damage it; it should be heated to a specific, lower temperature for installation.

Question 3

Technician A says that to identify a vehicle all you need to know is the make and model. Technician B says that the VIN code can be found in the owner's manual. Who is right?

Accepted Answer

Technician A's statement is incorrect because it's not enough to identify a vehicle by just knowing its make and model. There could be multiple vehicles with the same make and model. Technician B's statement is also incorrect because while the owner's manual may contain the VIN code, it can also be found on other parts of the vehicle such as the dashboard or door jamb. Therefore, neither technician is right.

Question 4

The engine has to be removed to replace a rear main (crankshaft) oil seal.

Accepted Answer

The rear main oil seal is located on the back of the engine, where the crankshaft connects to the transmission. In order to access and replace the seal, the transmission and flywheel or flexplate must be removed, and then the engine must be lifted or removed from the vehicle entirely.

Question 5

List four reasons that the repair order (R.O.) is important.

Accepted Answer

The answer of List four reasons that the repair order...

Question 6

Technician A says that a faulty head gasket often points to the need for head surfacing. Technician B says that a Teflon head gasket will often be brown, indicating excessive temperatures.Who is right?

Accepted Answer

The answer of Technician A says that a faulty head...

Question 7

The tenth digit of the VIN code will identify the engine size.

Accepted Answer

The tenth digit of the VIN code does not indicate the engine size. Its meaning can vary depending on the manufacturer and model of the vehicle, and may indicate information such as the model year, assembly plant, or vehicle options.

Question 8

Technician A says that all vehicles have vacuum diagrams under the hood and there is no need to mark the vacuum lines. Technician B says that for late model vehicles, microfiche will have all the information you need to rebuild the engine. Who is right?

Accepted Answer

Technician A is incorrect - not all vehicles have vacuum diagrams under the hood and marking vacuum lines is important to ensure they are reconnected properly.
Technician B is also incorrect - microfiche may have information about the engine, but it will not have all the information needed to rebuild the engine.

Question 9

What information is included on an under-hood emission control label?

Accepted Answer

The answer of What information is included on an under-hood...

Question 10

Technician A says that there is a correct sequence to follow when removing head bolts. Technician B says that when a cylinder wears, a ridge forms at the bottom of the cylinder. Who is right?

Accepted Answer

Technician A is correct because there is indeed a specific sequence to follow when removing head bolts to prevent warping or damage to the engine head. Technician B is incorrect because the ridge forms at the top of the cylinder, not the bottom, due to wear from the piston rings.

Question 11

How would you protect the crankshaft when removing pistons and rods?

Accepted Answer

The answer of How would you protect the crankshaft when...

Question 12

During engine removal with an automatic transmission, the torque converter stays with the engine.

Accepted Answer

During engine removal with an automatic transmission, the torque converter stays attached to the engine and is removed with it.

Question 13

The engine should be cold before removing the head.

Accepted Answer

It is recommended to allow the engine to cool down before attempting to remove the head, as hot metal can cause burns and also affect the accuracy of torque readings during disassembly.

Question 14

What causes the ridge at the top of a cylinder?

Accepted Answer

The answer of What causes the ridge at the top...

Question 15

For passenger vehicles manufactured for sale in the United States (domestic cars), where is the VIN located?

Accepted Answer

The answer of For passenger vehicles manufactured for sale in...

Question 16

Technician A says to label the core plugs as they are removed so they can be reinstalled. Technician B says to remove the core plugs before hot tanking the block. Who is correct?

Accepted Answer

Technician B is correct because removing the core plugs before hot tanking the block is necessary to ensure thorough cleaning of the engine block's internal passages. Technician A's suggestion to label and reinstall old core plugs is not a standard practice; typically, core plugs are replaced with new ones after cleaning.

Question 17

A flexplate is used with a manual transmission.

Accepted Answer

A flexplate is actually used with an automatic transmission, not a manual transmission. A flywheel is the component used with a manual transmission.

Question 18

Technician A says that it is alright to disconnect the air conditioning lines and drain the refrigerant in a pan. Technician B says that certification is required to operate a refrigerant recycling machine. Who is right?

Accepted Answer

Technician B is right. It is illegal to vent refrigerant into the atmosphere and it is required by law to recover and recycle any refrigerant. This requires a certification to operate a refrigerant recycling machine. Technician A's advice could result in environmental pollution and legal consequences.

Question 19

What is a "fitted block?"

Accepted Answer

The answer of What is a "fitted block?"...

Question 20

Technician A says that during engine disassembly, all main and rod bearings should be kept in order in case they will be reused. Technician B says that there is no need to keep bearings in order if new parts are to be used. Who is right?

Accepted Answer

Technician A is correct. When a used bearing is going to be reused, it is important to keep it in its original position in the engine. This is because bearings are subjected to unique loads and wear patterns that can cause them to adapt to the specific location within the engine where they were originally installed. If reused in a different location, the bearing may not perform as intended, resulting in premature wear or failure.

Quiz 4: Engine Removal, Disassembly, Inspection, and In-Chassis Repairs