Exam 5: Cylinder Components

Which of the following refers to the ring's ability to operate with as little friction as possible?

When doing a cylinder leak-down test, which of the following must be done?

Technician A says that oil control rings are designed to scrape as much oil as possible from the cylinder walls. Technician B says oil control rings leave a metered amount of oil on the cylinder walls. Who is correct?

Technician A says compression rings in a diesel engine are rectangular to extend engine life. Technician B says that the top compression rings have a barrel face to provide effective sealing. Who is correct?

Clearances between the sides of the piston instantly switch from one side to the other side as the piston moves:

A piston's compression ring seals best during a(n) __________.

What is the electrochemical process where aluminum is combined with oxygen to create a tough aluminum oxide finish?

Cylinder taper and out-of-round conditions are evaluated by measuring a cylinder dimensions with a dial bore gauge or:

Technician A says that a compression test of an engine's cylinders is the best method to use to diagnose a worn-out engine. Technician B says that measuring crankcase pressure is the best method to identify a worn-out engine. Who is correct?

Some wrist pins use a(n) ______ where the pin bore will increase in diameter with temperature in a running engine to allow the pin to move freely on both piston and con-rod?

Which of the following are used in the pin boss for improved strength?

Technician A says that after rebuilding an engine, the engine should be operated at low load and low speed to prevent any catastrophic damage. Technician B says that an engine should be operated under a heavy load as soon as possible after ring replacement. Who is correct?

When the small end is shaped like a triangle, it is called a(n) _____rod.

Which shape is most often used for compression rings in medium-duty diesel engines?

Two technicians are discussing piston rings. Technician A says that piston rings form a gas tight seal between the piston and the cylinder wall. Technician B says that oil control rings can be installed by hand with no special tools. Who is right?

Technician A says that most high-horsepower (high-kilowatt) diesel engines use trunk-type pistons. Technician B says that most high-horsepower (high-kilowatt) diesel engines today use steel pistons. Who is correct?

Which ring will cause excessive oil consumption if it is installed upside-down?

The piston grooves are located in the:

Under which of the following conditions is the most engine slobber produced?

Number four cylinder piston is burnt with scuff marks on it. Which of the following is the MOST LIKELY cause?