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

Question 1

6)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

Answer 1

C

Question 2

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

Answer 2

oil

Question 3

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

Answer 3

True

Question 4

15)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 5

18)____________________ are used to repair a cracked or damaged cylinder.

Question 6

8)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 7

7)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 8

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

Question 9

12)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.

Question 10

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

Question 11

14)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

Question 12

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

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

Question 13

4)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 14

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

Question 15

10)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 16

13)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

Question 17

9)____ 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 18

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

Question 19

5)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 20

2)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 21

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

Question 22

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

Question 23

21)What is the purpose of the crosshatch?

Question 24

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

Question 25

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