Diesel Engines

Question 1

When replacing a piston ring you have to replace all rings not just one true or false?

Answer 1

True

Question 2

What is scraping used for?

Answer 2

Blend or smooth edges of oil grooves and remove high spots from bearing journal

Question 3

What can improper engine timing cause?

Answer 3

Loss of power

Question 4

What are torsional vibrations cause by on the crankshaft?

Answer 4

The firing pulses of the cylinders

Question 5

When an engines power pulses excite a natural crankshaft frequency it is called what?

Answer 5

Resonant or critical vibration

Question 6

What are three ways to attach flywheel to crankshaft?

Answer 6

Split hub flywheel
Tapered shaft and hub
Flange connection

Question 7

What sound will counter weights make when moving out of alignment?

Answer 7

Pounding

Question 8

What type of fluid fills a viscous type vibration dampener?

Answer 8

Silicone

Question 9

What type of vibration dampener is driven by leaf springs?

Answer 9

Harmonic balancer

Question 10

What type of vibration dampener consist of two or more steel symmetrically located heavy steel balances?

Answer 10

Pendulum

Question 11

What should be checked upon encountering a vibrating engine?

Answer 11

The alignment of the drive to the driven unit?

Question 12

What could an inoperable dampener cause?

Answer 12

Failure of bearings and gears

Question 13

Correct engine alignment shall be maintained internally between what?

Answer 13

Crankshaft main bearing bores and their bearings

Question 14

What is the minimum hours after undocking that shall be waited prior to checking alignment or realignment shall take place?

Answer 14

48 hours

Question 15

What is the maximum allowable limit of shim size use?

Answer 15

.050

Question 16

What is used to check the bearing bores?

Answer 16

Mandrel

Question 17

Where are crankshaft deflection readings taken?

Answer 17

At the crankthrow nearest the coupling

Question 18

Within how much of an inch does a deflection gauge read crankshaft alignment?

Answer 18

1/1000

Question 19

If a deflection gauge moves to the plus side of the zero (left) it means the webs are doing what?

Answer 19

Opening

Question 20

Movement towards the - minus side of the zero ( right) indicate what?

Answer 20

Closing

Question 21

The dimension X in relation to crankshaft alignment equals how much of the engine stroke?

Answer 21

1/2

Question 22

What can a needle valve from a scrapped fuel injector be used as when taking crankshaft alignment readings?

Answer 22

A sharp punch

Question 23

When taking deflection readings crankshaft and deflection. Gauge should be the same ambient temp true or false?

Answer 23

True

Question 24

At what temperature are deflection readings normally taken?

Answer 24

Cold

Question 25

Where should the crankpin be located?

Answer 25

Near the bottom center

Question 26

How far should a crankshaft deflection gauge be preloaded?

Answer 26

1/3 of its travel

Question 27

When should a deflection reading be retaken if not within how much of a thousandth?

Answer 27

1/4

Question 28

How many reading are taken with a deflection gauge?

Answer 28

5

Question 29

Readings at the 1 and 5 position when using a deflection gauge should be within how much of a thousandth of each other?

Answer 29

1/2

Question 30

What is the most important position when taking deflection gauge reading on the crankshaft?

Answer 30

3

Question 31

Why is reading number 3 the most important measurement for deflection gauge readings?

Answer 31

Shows bearing wear, condition of foundation and, position of the outboard bearing

Question 32

When all deflection gauge readings are pluses the crankshaft is convex in what direction?

Answer 32

Upwards

Question 33

When all readings are - negative the crankshaft convex in witch direction?

Answer 33

Downwards

Question 34

Do not use what type of material for tubing or piping for gauge lines in fuel and lube oil systems?

Answer 34

Copper