Compressor Crosshead and Distance Piece Components

Question 1

The large end of a connecting rod has a ___

Answer 1

shell

Question 2

A burr between the mating surfaces of the cylinder and distance piece can cause rod runout.

a) true
b) false

Answer 2

true

Question 3

The distance piece serves what four (4) purposes?

a) _____
b) _____
c) _____
d) _____

Answer 3

a) to prevent compression gases from pressurizing the crankcase
b) to prevent oil from the crankhouse from reaching the cylinder
c) to provide access to packings and oil wipers from maintenance
d) to provide access for rod runout readings

Question 4

What basic style of distance piece would you most likely need for an absolutely oil-free application?

Answer 4

You need an extra-long distance piece with baffle

Question 5

A bent flange on a distance piece will not affect rod runout.

a) true
b) false

Answer 5

False: A bent flange on a distance piece will misalign the head

Question 6

Crossheads with shimmable shoes provide for rod runout adjustment in both the vertical and horizontal planes.

a) true
b) false

Answer 6

False: Crossheads with shimmable shoes adjust in the vertical plane only.

Question 7

The purpose of performing a rod runout check is to ensure that the cylinder bore and crosshead centre lines are at the same level.

a) true
b) false

Answer 7

True

Question 8

You take rod runout readings through the distance piece access holes and perform them in both he horizontal and vertical planes.

a) true
b) false

Answer 8

True

Question 9

The purpose of the crosshead and guides is to make the packing seal efficiently on the piston rod.

a) true
b) false

Answer 9

True

Question 10

The function of a connecting rod is to convert rotating motion to reciprocating motion.

a) true
b) false

Answer 10

True

Question 11

All connecting rods are symmetrical and are thus impossible to install incorrectly.

a) true
b) false

Answer 11

False: the fit is not identical