Exam 5: Cylinder Components

After discovering broken rings in an with more than a five thousand engine hours, Technician A says that the rings were most likely broken due to improper installation. After discovering the same broken rings in an engine, Technician B says the rings were broken due to excessive cylinder taper. Who is correct?

Two technicians are discussing side thrust. Technician A says that the piston pin axis offset from the cylinder centerline eliminates noises caused by the rocking of the piston. Technician B says that to minimize the degree of side thrust, engine manufacturers often offset the centerline of the wrist pin with the centerline of the piston. Who is right?

If an engine has 30% loss of crosshatch near the top of each cylinder, approximately what percentage of remaining service life does the engine have?

What rings are located nearest the piston crown?

Which of the following is the practice recommended to evaluate how well a diesel engine's piston rings seal?

Technician A says a scuffed piston skirt and burned piston crown in one cylinder of a recently overhauled engine is likely due to a damaged or improperly aligned oil cooler nozzle. Technician B says the engine was overheated. Who is correct?

What type of piston uses less material between the piston crown and piston pin?

Technician A says that when a diesel engine idles excessively, it will cause its cylinder walls to glaze and piston rings to stick. Technician B says idling an engine regularly for long periods of time causes piston rings to break. Who is correct?

Technician A says that ensuring long ring life is a function of service practices. Technician B says that rings must perform under extreme temperatures for the life of the engine. Who is right?

What is the compression ring shape of choice for most engine manufacturers?

If an engine has a noise when it is cold but the noise disappears when the engine is warmed up, what is a likely cause of the noise?

Where is a nickel insert used in an aluminum alloy piston used by diesel engines?

Which of the following is the practice recommended to evaluate how well a diesel engine's piston rings seal?

What type of piston ring is usually cast iron with scraper rails that remove excess oil from the cylinder wall while leaving a metered quantity for lubricating the cylinder wall?

While two technicians are discussing the cause of a cracked piston crown with a vertical crack through the inner edge of the combustion bowl, Technician A suggests that the piston has a manufacturing defect. Technician B suggests that using too much starting fluid cracked the piston. Who is correct?

Technician A says that when the rings are installed in the lands, you are ready to install the piston. Technician B says piston rings that are not properly aligned can result in oil consumption. Who is right?

Trunk type pistons are used in more rugged applications of diesel engines such as inline-sixes with:

One common feature is that connecting rod ends can have an offset or split of the rod cap of ____ degrees.

Which engine components wear faster than other internal engine parts, thus limiting engine life?

Lower cylinder pressures allow the use of: