Question 1

Abrasive pads or discs should be used ________.

Accepted Answer

Abrasive pads or discs should be used with care, including cleaning the part thoroughly afterward to remove abrasive material, using the specified grit size for the material being cleaned, and ideally on disassembled engine parts to avoid contamination and ensure thorough cleaning.

Question 2

What actually does the cleaning when using steam?

Accepted Answer

The cleaning power of steam comes from both the pressure behind the steam, which helps to dislodge dirt and grime, and the heat from the steam, which helps to dissolve substances that are otherwise difficult to remove.

Question 3

Aqueous-based cleaning means ________.

Accepted Answer

Aqueous-based cleaning refers to cleaning methods that primarily use water as the solvent. This contrasts with solvent-based cleaning, which relies on chemical solvents to dissolve and remove contaminants.

Question 4

A pyrolytic oven is used to clean parts; however, caution should be used to limit the temperature in order to prevent damaging engine parts. What are the maximum recommended temperatures?

Accepted Answer

Pyrolytic ovens can operate at high temperatures to clean parts by burning off residue. However, to prevent damage to engine parts, it's recommended not to exceed temperatures of 600° F (315° C) and 800° F (425° C), making both B and C correct.

Question 5

Which media is best to use for cleaning parts, as it does not need to be thoroughly cleaned after using?

Accepted Answer

Baking soda is a gentle abrasive that is water-soluble, making it easy to rinse off without leaving residue.

Question 6

Cleaning chemicals are usually either a caustic material or an acid material. Which of the following statements is TRUE?

Accepted Answer

The pH scale measures how acidic or basic a substance is. It ranges from 0 to 14. A pH of 7 is neutral, like pure water. Acids have a pH less than 7, and bases (caustic materials) have a pH greater than 7.

Question 7

Many cleaning methods involve chemicals that are hazardous to use. The least hazardous method is generally considered to be the ________.

Accepted Answer

The answer of Many cleaning methods involve chemicals that are...

Question 8

Magnetic crack inspection ________.

Accepted Answer

Magnetic crack inspection involves the application of fine iron powder to the surface of iron parts. The presence of a magnetic field causes the powder to accumulate at crack locations, making them visible.

Question 9

Technician A says that engine parts need to be be cleaned before a thorough test can be done to detect cracks. Technician B says that pressure testing can be used to find cracks in blocks or cylinder heads. Who is right?

Accepted Answer

Technician A is correct because cleaning engine parts is essential for accurately detecting cracks, as dirt and oil can obscure them. Technician B is also correct because pressure testing is a common and effective method for identifying cracks in engine blocks and cylinder heads.

Question 10

Plugging can be used to repair cracks ________.

Accepted Answer

Plugging is a repair technique that can be used for cracks in both cast-iron and aluminum cylinder heads, offering a versatile solution for engine repair.

Question 11

Technician A says that any normal chemical can be used to clean aluminum parts or components. Technician B says that most chemical cleaners are strong soaps called caustic materials. Who is right?

Accepted Answer

Technician B is correct because most chemical cleaners used for automotive parts, including those for aluminum, are indeed strong soaps or detergents, often referred to as caustic materials. These materials can effectively clean but must be chosen carefully to avoid damaging sensitive materials like aluminum. Technician A is incorrect because not any normal chemical can be safely used to clean aluminum parts; some chemicals can cause corrosion or damage to aluminum components.

Question 12

Technician A says that mechanical cleaning with scrapers or wire brushes can be used to remove deposits. Technician B says that steel wire brushes can be used to clean aluminum parts. Who is right?

Accepted Answer

Technician A is correct because mechanical cleaning with scrapers or wire brushes is a common method for removing deposits from various surfaces. However, Technician B is incorrect because using steel wire brushes on aluminum parts can cause damage to the softer aluminum surface, potentially embedding steel particles that can lead to corrosion.

Question 13

Most chemical cleaners used for cleaning carbon-type deposits are strong soaps called ________.

Accepted Answer

Caustic materials are strong soaps used for cleaning carbon-type deposits due to their ability to break down organic materials.

Question 14

Technician A says that a wire brush is used mainly on aluminum engine parts. Technician B says that a wire brush is used mainly on cast iron engine parts. Which technician is correct?

Accepted Answer

Wire brushes are typically used on more durable materials like cast iron rather than on softer metals like aluminum, which can be easily damaged by the harsh bristles of a wire brush. Therefore, Technician B's statement is correct.

Question 15

Technician A says that carburetor cleaner is one of the most common cold soak agents used in an engine reconditioning shop. Technician B says that a hydroseal is a layer of water on top of the solvent to prevent evaporation. Which technician is correct?

Accepted Answer

Technician A is correct because carburetor cleaner is a common cold soak agent. Technician B is also correct because a hydroseal is a layer of water on top of the solvent to prevent evaporation.

Question 16

Technician A says that an attendant must be present any time a pyrolytic oven is used. Technician B says that aluminum parts should be cleaned at a temperature greater than 600 deg F. Which technician is correct?

Accepted Answer

Pyrolytic ovens are designed to operate safely without constant supervision, and cleaning aluminum parts at temperatures greater than 600°F can cause damage to the aluminum.

Question 17

All of the following are methods of mechanical cleaning EXCEPT ________.

Accepted Answer

Chemical solvents are not a method of mechanical cleaning; they are a method of chemical cleaning. Mechanical cleaning involves physical actions such as abrasive blasting, brushing, and scraping to remove contaminants.

Question 18

Technician A says that the fluorescent penetrant test method can be used to detect cracks in iron, steel, or aluminum parts. Technician B says that the dye penetrant test can only be used with aluminum parts. Which technician is correct?

Accepted Answer

Technician A is correct because the fluorescent or dye penetrant test method can be used on non-porous materials, including iron, steel, and aluminum, to detect surface flaws. Technician B is incorrect because the method is not limited to aluminum parts only.

Question 19

Which crack detection technique requires the use of a blacklight?

Accepted Answer

Zyglo, a form of liquid penetrant inspection, uses a fluorescent dye that requires a blacklight (UV light) to make the cracks visible after the inspection process.

Question 20

Technician A says that pressure testing involves injecting pressurized air into engine block water and oil passages. Technician B says that one pressure testing method involves injecting heated water and a dye into engine block water and oil passages. Which technician is correct?

Accepted Answer

Technician A is correct because pressure testing can involve injecting pressurized air into the engine's cooling system to check for leaks. Technician B is also correct because another method of pressure testing involves using heated water and dye to identify leaks in the engine block's water and oil passages.

Quiz 29: Engine Cleaning and Crack Detection