Deck 53: Engine Diagnosis and Service: Block, Crankshaft, Bearings, and Lubrication System

Question 1

While having a discussion, Technician A says that a plugged screen can ruin a new engine in a very short time. Technician B says that a plugged screen has no effect on the engine. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Answer 1

A

Question 2

While having a discussion, Technician A says that a front bearing with excessive clearance will knock. Technician B says that excessive clearance can cause low oil pressure. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Answer 2

C

Question 3

All of the following statements are true EXCEPT:

A)bearing clearance can be checked with Plastigage.
B)Plastigage is oil soluble and is readily cleaned from the bearing or crankshaft.
C)an engine with double oil clearance will throw off five times as much oil onto the cylinder walls, causing increased oil consumption.
D)you should rotate the crankshaft while Plastigage is in place.

Answer 3

D

Question 4

Cylinders become glazed where the piston rings contact the cylinder wall.

Question 5

____________________ after boring provides a much more satisfactory surface for new rings and promotes longer ring life.

Question 6

____________________ occurs when excessive piston-to-cylinder wall clearance allows the piston skirt to tap against the cylinder wall.

Question 7

____ occurs when the load on the engine is greater than the rpm needed to develop enough horsepower to pull the load.

A)Knurling
B)Lugging
C)Knocking
D)Stitching

Question 8

The tool that is MOST-Likely used to regrind a crankshaft is the:

A)stress raiser
B)crosshatch
C)gasket
D)crankshaft grinder

Question 9

Uneven rod bearing wear, and sometimes piston skirt wear, usually indicates a(n) ____.

A)tapered bearing journal
B)valve clearance
C)interference
D)undersized crank

Question 10

____________________ are used to repair a cracked or damaged cylinder.

Question 11

The part that will MOST-Likely be easily bruised or distorted during installation of pressed-fit oil pickup screens is the:

A)pump housing
B)O-ring seal
C)crosshatch
D)socket adapter

Question 12

A crankshaft sometimes wears excessively because of abrasives in the ____________________.

Question 13

Which of the following will LEAST-Likely be used to measure the cylinder bore?

A)Telescoping gauge and micrometer
B)Inside micrometer
C)Torque gauge
D)Cylinder dial bore gauge

Question 14

Which of the following statements is LEAST-Likely true?

A)Block castings can be distorted when heads and main cap bolts are torqued.
B)A boring stand is desirable for reboring and honing blocks.
C)Cylinders can be up to 0.012" out-of-round when the block is hung from one end on a conventional universal engine stand.
D)Boring cylinders with a portable boring bar while the block is mounted to one of these stands can produce oval-shaped cylinders.

Question 15

All of the following statements are true EXCEPT:

A)cylinders are deglazed for use with new rings only if they have excessive bore taper.
B)damaged cylinders or cylinders with too much taper should be rebored and honed by a machine shop to fit new oversized pistons.
C)the top of an oversize piston is stamped with the amount of oversize.
D)pistons of 0.030" oversize are most commonly used.

Question 16

Glaze breakers remove metal at a much faster rate than the rigid hones that are used to finish a cylinder to the correct size after boring.

Question 17

Too much taper wear is also accompanied by out-of-round (oval) wear, which results when the piston rocks on its wrist pin at top dead center and bottom dead center.

Question 18

Crosshatching that is too steep (less than 60 degrees) will allow oil to run down the cylinder wall; too flat (more than 20 degrees) causes too thick an oil film.

Question 19

It is more difficult for new rings to seal against an out-of-round cylinder than a tapered one.

Question 20

The crankshaft can be checked for obvious cracks by "____________________" the counterweights with a light tap of a hammer.

Question 21

Briefly describe the procedure recommended by Federal-Mogul Corporation for positioning the oil hole.

Question 22

After boring and honing, the top of the bore is chamfered about 1/16". Why is this done?

Question 23

Explain how the stones on a spring-loaded glaze breaker can be accidentally broken.

Question 24

Why is it not advisable to sand bearings with an emery cloth?

Question 25

What is the purpose of the crosshatch?