Engine repair: Chapter 11 Lower End Theory and Service
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
A) adjust camshaft timing on a performance camshaft
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 answers are correct
D) All answers are correct
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
D) All engines equipped with roller lifters require periodic valve [lash] adjustment
All the examples listed below are core plug types EXCEPT: A) Cup Type B) Disc or Dished Type C) Expansion Type D) Babbitt Type
D) Babbitt Type
All the following are types of oil pumps except _____. A) rotor B) crescent [trochoidal] C) gear D) centrifugal
D) Centrifugal
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
D) connecting rod and main bearings
Which of the following is NOT a core plug design? A) disc-type B) cup-type C) expansion-type D) contraction-type
D) contraction-type
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
D) harmonic balancer
What tool is required to remove a dished-type core plug? A) vise grips B) Allen socket C) three-jaw puller D) slide hammer
D) slide hammer
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
A) A only
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
A) A only
Which of the following is NOT a type of camshaft drive mechanism? A) shaft B) gear C) chain D) belt
A) shaft
The maximum amount of cylinder taper normally allowed is: A) 0.0015 in. (.038 mm) B) 0.006 in. (.15 mm) C) 0.0015 in. (.38 mm) D) 0.06 in. (1.5 mm)
B) 0.006 in. (.15 mm)
Most pistons used today are made from _____. A) Cast Iron B) Aluminum C) Ceramic D) None of these answers is correct
B) Aluminum
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
B) B only
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
B) B only
Each half of a split bearing is made so that it is slightly greater than an exact half. What is this extension called? A) spread B) crush C) both A and B D) neither A nor B
B) Crush
Pistons for modern engines are made of _____. A) cast iron B) aluminum C) titanium D) steel
B) aluminum
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
C) Both A and B
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 "connecting rod journal and connecting rod bearing" and "main bearing journal and main bearing" D) neither "connecting rod journal and connecting rod bearing" nor "main bearing journal and main bearing"
C) both "connecting rod journal and connecting rod bearing" and "main bearing journal and main bearing"
A cylinder bore can be checked for out-of-roundness with a _____. A) dial bore gauge B) telescoping gauge and micrometer C) both "dial bore gauge" and "telescoping gauge and micrometer" D) neither both "dial bore gauge" nor "telescoping gauge and micrometer"
C) both "dial bore gauge" and "telescoping gauge and micrometer"
A full floating piston pin _____. A) rotates in the piston B) rotates in the connecting rod C) both "rotates in the piston" and "rotates in the connecting rod" D) neither both "rotates in the piston" nor "rotates in the connecting rod"
C) both "rotates in the piston" and "rotates in the connecting rod"
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
C) both A and B
Technician A says engine blocks are made from cast 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
C) both A and B
Technician A says piston ring grooves should be cleaned with a piston ring 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
C) both A and B
Technician A says that a cylinder wall with too smooth a surface will prevent the piston rings from seating properly. Technician B says a cylinder wall should have a crosshatch honing pattern. Who is correct? A) A only B) B only C) both A and B D) neither A nor B
C) both A and B
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
C) both A and B
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
C) both A and B
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
C) both A and B
The connecting rod journal is also called the ______. A) pin boss B) vibration damper C) piston pin D) crank pin
D) Crank Pin
