Engines Chapter 9

All of the following are true of slipper skirt pistons EXCEPT?

• skirt material is removed from the non-thrust sides

• a shorter connecting rod can be used

• the piston is slightly heavier than trunk type

• allows for crank throw counterweight clearance

All of the following are correct concerning trunk type pistons EXCEPT?

• the piston is taller than it is wide

• the piston is stronger than slipper skirt type

• the piston is made of alloy steel

• trunk type is used in larger diesel engines

All of the following are correct concerning LCV (low crevice volume) pistons EXCEPT?

• fuel economy is improved

• exhaust emissions are improved

• hydrocarbon output is lowered

• compression is raised

As much as ______________ of the heat from the piston is transfered to the cylinder wall through the piston rings.

• 1/4

• 1/2

• 1/3

• 3/4

Piston pins are also known as _______________.

• crank pins

• wrist pins

• rod pins

• push rods

Most diesel engines have ________________ piston pins.

• full-floating

• semi-floating

• non-floating

• solid mass

Semi-floating piston pins are retained by __________.

• snap rings

• press fit

• roll pins

• retaining bolts

The majority of oil control is accomplished by __________________.

• the top ring

• the middle ring

• the bottom ring

• all the rings

The number one reason for premature piston ring wear is _________________.

• dirt ingestion

• over-fueling

• wrong oil viscosity

• EGR

Diesel engines flow more than ___________ times the EGR than gasoline engines.

• 3

• 2

• 4

• 5