Exam 54: Engine Diagnosis and Service: Piston, Piston Rings, Connecting Rod, Engine Balancing

Which of the following statements is LEAST-Likely true?

If a customer complains about engine vibration, where would you begin your investigation and why?

All of the following statements are true EXCEPT:

Pistons should be chemically cleaned while assembled to the piston pin and connecting rod.

While having a discussion, Technician A says that replacement pistons for passenger cars and light trucks are destroked 0.15" to compensate for block and head resurfacing. Technician B says that they are destroked at 0.25". Who is correct?

Whenever an engine is disassembled, the piston rings are replaced.

What causes piston ring wear?

Internal balancing of forged cranks is MOST-Likely achieved by drilling holes on the:

Damaging a metal surface raises stress, weakening the part. This is called a(n) "____________________."

Modern aluminum pistons have high silicon content that causes them to wear out the piston ring.

____________________ is done when a rod bearing has burned or if the big end has stretched.

While having a discussion, Technician A says that balance is not as important with V-type engines, but it is critical with in-line engines. Technician B says that balance is not as important with in-line engines, but it is critical in V-type engines. Who is correct?

Excessive heat can cause ____________________, which occurs when the cylinder wall and piston momentarily weld to each other when the piston stops at TDC.

All of the following statements are true EXCEPT:

When inspecting piston rings for wear, what should you look for?

____, also called static or kinetic imbalance, can be compared to the type of imbalance that is corrected when balancing tires with a bubble (level) balancer.

When a replacement piston is heavier than the others, it can be lightened at the ____________________.

The parts that are MOST-Likely used when spinning the crankshaft to simulate the correct weight are:

Compression rings are removed using a(n) ____________________.

An increase of 0.002" in the bore size will increase the gap by about 0.016".