Deck 11: Lower-End Theory and Service

Question 1

Oil pressure is determined by whether the pump is a gear type or rotor type and by oil clearances, the pump's pressure regulator valve, and oil viscosity.

Answer 1

True

Question 2

When installing a segmented oil control ring, the end gaps of the three pieces must line up.

Answer 2

False

Question 3

Aluminum blocks normally have sleeves or steel liners placed in them to serve as cylinder walls.

Answer 3

True

Question 4

All the examples listed below are core plug types EXCEPT:

A)cup
B)disc or dished
C)expansion
D)Babbitt

Question 5

A cylinder block may be a two-piece casting: the upper part contains the cylinders, and the lower part surrounds the crankshaft.

Question 6

A main or rod bearing insert that is an oversize bearing is thicker than the original bearing.

Question 7

Most cylinder wear occurs at the top of ring travel.

Question 8

The maximum amount of cylinder taper normally allowed is:

A)0.0015 in. (.038 mm)
B)0.006 in. (.15 mm)
C)0.015 in. (.38 mm)
D)0.06 in. (1.5 mm)

Question 9

The connecting rod journal is also called the ______.

A)pin boss
B)vibration damper
C)piston pin
D)crank pin

Question 10

The bottom ring on a piston is a compression ring.

Question 11

Longer-duration camshafts improve low-speed power but weaken high engine speed performance.

Question 12

The lobes of a camshaft designed for use with flat bottom lifters are slightly tapered. The taper causes the lifter to rotate in its bore.

Question 13

Old core and oil galley plugs are normally removed and replaced as part of cylinder block reconditioning.

Question 14

A damaged threaded hole in an aluminum block should be repaired by using a bottoming tap of the correct size.

Question 15

A used roller lifter can be installed on a new camshaft.

Question 16

Technician A says the distance across the outside parting surface of the bearing is slightly greater than the diameter of the housing bore, and this feature is called spread. Technician B says when a connecting bearing half is installed, the bearing edges extend slightly from the seat; this extension is called bearing crush. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 17

Timing belts are only used on OHC engines.

Question 18

Nearly all OHV engines use a timing chain to drive the camshaft.

Question 19

Most pistons used today are made from _____.

A)cast iron
B)aluminum
C)ceramic
D)brass

Question 20

A typical oil pump pickup filter screen serves to keep microscopic contaminants from reaching the oil pump.

Question 21

A cylinder bore can be checked for out-of-roundness with a _____.

A)dial bore gauge
B)telescoping gauge and micrometer
C)both A and B
D)neither A nor B

Question 22

Technician A says that the oil pump is driven directly by the crankshaft. Technician B says on some older engines the oil pump is driven by the distributor. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 23

Technician A says piston ring grooves should be cleaned with a groove cleaner. Technician B says piston ring grooves should be cleaned with a broken piston ring. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 24

Two technicians are discussing the installation of segmented [three piece] oil control rings. Technician A says the ends of the expander/spacer [middle piece] must overlap. Technician B says that the end gaps of all three pieces must be evenly spaced apart. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 25

A full floating piston pin _____.

A)rotates in the piston
B)rotates in the connecting rod
C)both A and B
D)neither A nor B

Question 26

A degree wheel is used to _____.

A)adjust camshaft timing on a performance camshaft
B)resurface the cylinder deck surface
C)align the crankshaft to the cylinder bores
D)install the oil pump

Question 27

Technician A says engine blocks are made from iron. Technician B says engine blocks are made from aluminum. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 28

Technician A says a piston pin is sometimes called a wrist pin. Technician B says the piston pin is always centered in the piston. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 29

Technician A installs a cup-type core plug with its flanged edge inward. Technician B hits the center [crown] of a dished-type core plug with a hammer to flatten and expand the plug for a tight fit. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 30

All of the following are correct statements about lifters EXCEPT:

A)Flat bottom (nonroller)lifters rotate in their bores
B)Roller lifters do not and should not rotate in their bores
C)The lobes on a camshaft designed for roller lifters may have a steeper ramp and a blunt nose
D)All engines equipped with roller lifters require periodic valve (lash)adjustment

Question 31

Two technicians are discussing undersized bearings. Technician A says a 0.001 in. or 0.002 in. bearing can be used on a stock crankshaft journal if the oil clearance [difference between the bearing diameter and the journal diameter] is slightly excessive and the journal is not excessively tapered or out of round. Technician B says 0.010 in., 0.020 in., and 0.030 in. undersized bearings are only used when the crankshaft journals have been reground. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 32

Technician A checks crankshaft endplay or end clearance with a feeler gauge. Technician B uses a dial indicator. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 33

Technician A says that the pickup screen is rarely replaced when an engine is rebuilt. Technician B s says that when installing the pickup Tube, you should reuse the original gaskets and seals.. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 34

What tool is required to remove a dished-type core plug?

A)vise grips
B)Allen socket
C)three-jaw puller
D)slide hammer

Question 35

Which operation must be performed before removing the pistons from an engine?

A)Install rod bolt protector sleeves
B)Remove the cylinder ridge with a ridge reamer
C)If the connecting rods are not marked from the factory, number the rods with a prick punch or number stamp
D)All of these steps must be taken.

Question 36

Technician A uses a micrometer to measure the connecting rod journal for taper. Technician B uses a micrometer to measure the connecting rod journal for out-of-roundness. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 37

Pistons for modern engines are made of _____.

A)cast iron
B)aluminum
C)titanium
D)steel

Question 38

Technician A says the maximum amount of cylinder out-of-roundness allowed in most cases is 0.0015 in. (.038 mm). Technician B says that a cylinder can have a taper of up to 0.010 in. (.254 mm)and be acceptable. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 39

When installing an oil pump in an engine: Technician A packs the pump with petroleum jelly. Technician B submerges the pump in clean oil and rotates the pump shaft to fill the pump body. Who is correct?

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

Question 40

Which of the following is NOT a type of camshaft drive mechanism?

A)shaft
B)gear
C)chain
D)belt

Question 41

How is deck warpage checked?

Question 42

Babbitt, a mixture of lead and tin, is used in _____.

A)piston skirt coatings
B)piston head coatings
C)camshaft coatings
D)connecting rod and main bearings

Question 43

Combustion heat, engine oil, and piston movement combine to form a thin residue on the cylinder walls that is commonly called ____________________.

Question 44

____________________ shafts are driven by a belt or chain at twice crankshaft speed to reduce engine vibration.

Question 45

A lifter that has a concave contact face must be ____________________.

Question 46

A thrust plate is sometimes used to limit the fore and aft movement (endplay)of the ____________________.

Question 47

Plastigage is used to check the clearance between _____.

A)connecting rod journal and connecting rod bearing
B)main bearing journal and main bearing
C)both A and B
D)neither A nor B

Question 48

Describe how to use Plastigage.

Question 49

A vibration damper is often called a(n)____________________ balancer.

Question 50

____________________ is the difference in diameter between the bottom of the cylinder bore and the top of the bore just below the ridge.

Question 51

When are undersized bearings used?

Question 52

The holes in the cylinder block that allow the removal of sand used in the casing process are sealed by ____________________.

Question 53

Describe a basic short block assembly.

Question 54

Hub, inertia ring, and elastomer (rubber)sleeve are parts of a _____.

A)balance shaft assembly
B)oil pump
C)timing chain tensioner
D)harmonic balancer

Question 55

What is the function of the flywheel?

Question 56

How is a long block different from a short block?

Question 57

Maximum taper for a rod journal is typically ____________________ inch.

Question 58

Most camshafts on overhead valve engines use ____________________-piece bearings.

Question 59

When cylinder surfaces are badly worn or excessively scored or tapered, a(n)____________________ bar is used to cut the cylinders for oversize pistons or sleeves.

Question 60

The oil hole drilled in the big end of a connecting rod serves to lubricate the piston skirt and ____________________.

Question 61

Where does maximum cylinder bore wear occur?

Question 62

What is the function of compression rings?

Question 63

What is the major thrust face?

Question 64

What part of the block is the deck?

Question 65

What is the function of the crankshaft thrust bearing?