Crankshaft and Related Components Service

Question 1

Flywheel Removal

Answer 1

Leave two bolts in before installing guide studs and then removing last two bolts. Some flywheels may required the use of lifting device.

Question 2

Vibration Damper removal

Answer 2

Never hammer or pry on damper, if force in necessary use the appropriate puller

Question 3

Before removing the main bearing caps:

Answer 3

Make sure to check for marking to identify cap position

Question 4

When removing lift straight as possible and watch for:

Answer 4

Counterweights and throws catching on the main bearing webs

Binding between the thrust bearings and the crankshaft

Question 5

Crankshaft storage

Answer 5

Crankshaft should be stored vertically and bolted to the flywheel
Crankshafts that are to large to be stored vertically can be stored horizontally in special v-blocks or crates

Question 6

Bearing cap storage

Answer 6

Main bearing caps should be reinstalled in to the block for storage

Question 7

Crankshafts can be cleaned using

Answer 7

Petroleum solvent
Hot tank
Mechanical parts washer
Steam cleaner

Question 8

Crankshafts should be visually inspected for:

Answer 8

Scoring
Riding
Discolouration
Damaged threads
Grooves on seal surfaces

Question 9

Crankshaft measurement

Answer 9

Cranks should be measured for taper, out of round, and wear, as well as distance on thrust faces
When measuring make sure to stay away from fillet radius and oil holes

Question 10

Flywheel inspection

Answer 10

Cracks in flywheel surface, and ring gear teeth
Check for chipped or worn teeth on ring gear
Thread damage

Question 11

Damper inspection

Answer 11

Any movement greater the 1/16” indicates that the bond has broken between the rubber and the interia mass in rubber damper.
Viscous dampers are often replaced during major overhaul
Viscous dampers should be inspected for cracks, signs of fluid leakage, and dents

Question 12

Crankshaft failures usually the result of:

Answer 12

Incorrect or excessive loading
Incorrect service procedures
Lubrication problem

Question 13

Torsional loads

Answer 13

a uneven twisting force, most likely to cause breaks in the area of the connecting rod journal

Question 14

What happens with incorrect crankshaft end play?

Answer 14

Insufficient - lack of lubrication, results in damaged thrust surfaces
Excessive - side loading of the pistons and con rods, as well as crankshaft to contact the webs of block

Question 15

List two reasons for using proper lifting equipment when handling heavy engine components?

Answer 15

Prevent personal injuries

Prevent component damage

Question 16

Why must the main bearing caps be re-installed in their original position in block?

Answer 16

To maintain main bearing bore geometry

Question 17

Why is proper storage of the crankshaft so important?

Answer 17

To prevent warpage and damage from falling

Question 18

Oil passages in crank should be cleaned thoroughly to prevent:

Answer 18

Prevent foreign material from being flushed into the bearing when engine started

Question 19

When using a chisel to remove seal wear sleeve from crankshaft care must be taken not to:

Answer 19

Do not cut through sleeve and damage crank

Do not hit sleeve directly above a bolt hole

Question 20

Undersized bearings are installed when:

Answer 20

The crankshaft has be machined down

Question 21

After installing upper bearings during major overhaul, check alignment of what before the crankshaft is re-installed

Answer 21

Bearing oil holes and tangs

Question 22

Flywheel housing alignment should be checked using?

Answer 22

A dial indicator mounted to the crankshaft

Question 23

Crankshafts that have cracks in critically loaded areas are usually:

Answer 23

Replaced

Question 24

Teflon lip crankshaft seal and wear sleeve assemblies be:

Answer 24

Installed as a unit with proper tooling

Question 25

What checks should be preformed before installing the vibration damper and flywheeel

Answer 25

Check the mounting surfaces of the damper, flywheel and crankshaft for burrs and foreign material that could cause runout