Ep1 Final
TRUE/FALSE A failed intake air temperature sensor will cause a severe drop in fuel mileage.
False
TRUE/FALSE A lean air-fuel mixture results in poor gas mileage.
False
TRUE/FALSE An intake valve is usually smaller than an exhaust valve.
False
TRUE/FALSE Direct ignition coils mount directly below each spark plug.
False
TRUE/FALSE If No. 2 diesel oil is not available, home heating oil can be used in an engine.
False
TRUE/FALSE Low impedance fuel injectors require high voltage for rapid operation.
False
TRUE/FALSE Most electric fuel pumps are of the reciprocating type.
False
TRUE/FALSE Most paper air filter elements can be cleaned and reused at least once.
False
TRUE/FALSE Primary windings in a coil usually consist of a few thousand turns of heavy wire.
False
TRUE/FALSE Radio suppression wires have about 1,000 ohms resistance per foot.
False
TRUE/FALSE Tetraethyl lead is still widely used as an anti-knock additive in gasoline.
False
To start a spark plug in its hole, you should use a ratchet.
False
True or False? Hot air from a supercharger carries more oxygen for combustion than an equal amount of cooler air.
False
True/False A metric micrometer is graduated to provide readings in tenths of inches.
False
True/False For measurements smaller than 1/64 inch, fractions are the easiest, most accurate unit to use.
False
True/False For safety, battery charger leads must be connected to the battery after the charger is turned on.
False
True/False Rocker arms connect the camshaft to the push rods.
False
True/False Shop air pressure is seldom higher than 50 psi.
False
True/False The flywheel contains a small ring gear, which is used to start the engine.
False
True/False Two-stroke cycle engines are as fuel-efficient as four-stroke cycle engines.
False
True/False diesel engine uses a spark plug to ignite the fuel.
False
Why are expansion freeze plugs used?
For tight quarters
High-power hybrids usually require __________ liquid cooling to prevent motor-generator stator winding failure.
Forced
Water pump
Forces coolant through the engine and other system parts.
Describe the process of reverse flushing.
Forcing new coolent through the system in the opposite direction of normal flow.
(A) Fluid coupling fan clutch (B) Thermostatic fan Designed to slip at higher engine speeds. clutch (C) Flex fan (D) Engine-powered fan (E) Electric cooling fan (F) Fan motor
A
A water pump traps coolant between the impeller blades and the coolant is thrown outward by ________.
Centrifugal Force
When the engine is cold, the thermostat will be _________ and coolant cannot circulate through the radiator.
Closed
Radiator Hoses
Connect the engine to the radiator
Thermostat
Controls coolant flow and engine operating temperature.
What is reverse flow cooling?
Cool coolant enters the hand in hot coolant exits the block to return to the radiator.
A combustion leak test checks for the presence of combustion gases in the _______.
Coolant
TRUE/FALSE A clicking sound from an injector indicates that it is faulty and should be replaced.
False
Bad insulation on secondary wires can easily be detected with an ohmmeter.
False
TRUE/FAISE A filter wrench should be used to "snug up" the filter after an oil change.
False
TRUE/FAISE An O-ring seal should never be exposed to oil or other engine fluids.
False
When should Current be changed?
Regular intervals
What effect does flushing have on a cooling system?
Removes contaminats out of the radiator as well as other impotant components.
The radiator in some late-model vehicles is designed to be (rebuilt, replaced) _________ rather than (rebuilt, replaced)___________.
Replaced and rebuilt
Describe how to perform a visual cool inspection.
Rub your finger inside the radiator filler neck or reservoir tank.
When testing an electric cooling fan, verify that the ignition key is in the _______ position.
Run
After prolonged use, coolant will break down and lose its _________ preventative properties.
Rust
What are two common reasons for pump failure?
Rust in the cooling system and lack of coolant.
A(n) __________ on a shaft could cut a new seal during installation, causing it to leak.
Scratch
With some engine designs, a rubber thermostat housing __________ is used instead of a gasket.
Seal
When installing a water pump gasket, use an aPpproved _________ to adhere the new gasket to the pump.
Sealer
Name the two functions of a radiator cap.
Seals the top of the radiator filler neck to prevent leakage. Pressurize the system to raise the boiling point of coolant.
How do you test the temperature indicating light?
Set the tester to a specified resistance, the temperature gauge should read as specified
To lock a part onto a(n) ___________, a set screw is often used.
Shaft
How can an external currently probably recognized?
Show up as wet, discolored areas in the engine compartment or on the ground.
Air can be routed over the cylinder fins by plastic or sheet metal ducts and __________.
Shrouds
A crossflow radiator has its tanks on the _________ of the core.
Sides
Coolant _________ can be used to check coolant strength and pH level.
Test strips
When testing coolant voltage, if the solution generates a voltage above ________ volts, the antifreeze mixture should be drained and replaced.
0.5
Typical radiator cap pressure is _______ psi.
12-16
An engine operating temperature is usually between __________ F and __________F.
180 and 210
Combustion flame temperature can reach _________ F.
4500
Ideal cooling and protection from freeze up is a mixture of _______% water and ________% antifreeze.
50/50
(A) Hybrid cooling system (B) Hybrid air cooling system (C) Hybrid liquid Uses either circulated air or circulated liquid coolant to remove cooling excess heat from compartments in the electric powertrain.
A
(A) Radiator core (B) Radiator tanks (C) Radiator filler neck (D) Transmission oil cooler The fragile center section of the radiator. (E) Radiator petcock (F) Radiator cap
A
(A) Radiator hoses (B) Molded hose (C) Flexible hose (D) Hose spring Carry coolant between the engine water jackets and the radiator. (E) Heater hoses (F) Hose clamps (G) Worm-drive hose clamp
A
(A) Water pump shaft (B) Water pump bearings Steel shaft that transfers turning force from the hub to the impeller. (C) Water pump housing (D) Water pump impeller (E) Water pump gasket (F) Water pump seal (G) Water pump hub
A
A cutting torch generates tremendous heat by burning ________ and acetylene gas. A. oxygen B. propane C. nitrogen D. hydrogen
A
A soft, flexible material that is placed between parts to prevent leakage is called a __________. A. gasket B. frisket C. barrier D. All of the above.
A
A(n) __________ is sometimes provided to help remove trapped air when refilling the cooling system. A bleed valve (B) freeze plug (C) refractometer (D) flushing
A
A. Ignition control module. B. Secondary wires. C. Ignition switch. D. Crankshaft position sensor. E. Ignition coil. F. Spark plugs. G. Primary wires. An electronic circuit used with the crankshaft speed sensor to make and break current to the ignition coil.
A
A. Pent-roof combustion chamber. B. Diesel. C. Opposed cylinder arrangement. D. Wankel. Improves volumetric efficiency and reduces emissions.
A
An inline engine has __________ bank(s) of cylinders. one
A
Engine coolant consists of _________. A. water and antifreeze B. oil and antifreeze C. water and stop leak D. water only
A
Fuel pressure for an older carburetor-type fuel system is normally ________. A. 4-6 psi (28-41 kPa) B. 15-40 psi (100-280 kPa) C. 40-65 psi (280-448 kPa) D. 65-90 psi (448-621 kPa)
A
If you find fluid dripping from a vehicle, where is the likeliest direction to look for the actual leak? A. Directly above the drip point. B. Above and behind the drip point. C. Above and in front of the drip point. D. Immediately to the left or right of the drip point.
A
Pistons typically use compression rings and one oil ring. A. 2 B. 3 C. 4 D. 1-3
A
Scan tool readings made with the engine running at curb idle speed and full operating temperature are typical circuit values called _______. A. idle live readings B. baseline readings C. idle reference readings D. comparison readings
A
Technician A says that shop air pressure usually ranges from 100-150 psi. Technician B says shop air pressure is around 300 psi. Who is correct? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
A
The _______ is not one of the subsystems of an electronic fuel injection system. A. idle solenoid B. air induction system C. sensor system D. computer control system
A
The _________ punch is used to make a small indentation in metal before drilling a hole. A. center B. drift C. pin D. aligning
A
The water pump normally mounts on the __________ of the engine. A) front B) side (C) top (D) center
A
When changing engine oil, Technician A says the engine oil should be warm. Technician B says the oil should be cool. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
A
When installing a new oxygen sensor, coat the threads with ________. A. anti-seize compound B. silicone sealant C. motor oil D. lithium grease
A
When using a hacksaw, you should apply light pressure _________. A. on the forward stroke B. on the backward stroke C. on both forward and backward strokes D. None of the above.
A
Which type of pliers ar these? A-snap ring B-locking C-needle nose D-combination
A
____________ is another name used to describe the engine bottom end. A. Short block B. Cylinder block C. Crank end D. Lower deck
A
Name these fluid levels checkpoints.
A-engine oil filler cap B-brake fluid reservoir C-windshield was her reservoir D-battery E-engine oil dipstick F-power steering reservoir G-engine coolant reservoir
Name these cylinder arrangements
A-inline B-v type C-w type D-opposed
Name thes parts on the connecting rod
A-rod nut B-rod cap C-rod boot D-connecting rod E-rod small end F-rod bushing G-I beam H-rod bearing inserts
Name these parts of the intake and exhaust valves
A-valve stem tips B- keeper grooves C-stem D-face E-margin F-head
You can measure how _______ the solution is by performing a coolant voltage test.
Acidic
What can happen if excess heat is not removed from the engine?
An engine could be serionsly damaged in the matter of minutes.
What is an intercooler for a supercharger?
And air to liquid heat exchanger mounted under or at the outlet of the compressor rotors
A welder uses high electric current to create a(n) __________ that produces heat for joining metal.
Arc
(A) Fluid coupling fan clutch (B) Thermostatic fan clutch (C) Flex fan (D) Engine-powered fan Has a temperature-sensitive, bimetal spring that controls fan action. (E) Electric cooling fan (F) Fan motor
B
(A) Radiator core Metal or plastic ends that fit over the core tube ends. (B) Radiator tanks (C) Radiator filler neck (D) Transmission oil cooler (E) Radiator petcock (F) Radiator cap
B
(A) Radiator hoses (B) Molded hose (C) Flexible hose (D) Hose spring (E) Heater hoses (F) Hose clamps (G) Worm-drive hose clamp Manufactured in a special shape, with bends to clear the cooling fan and other parts.
B
(A) Water pump shaft (B) Water pump bearings (C) Water pump housing (D) Water pump impeller (E) Water pump gasket (F) Water pump seal (G) Water pump hub Plain or ball bearings that allow the pump shaft to spin freely in housing.
B
A cylinder bore must be precisely measured. Technician A says that the proper measuring tool for this job is a telescoping gauge. Technician B says an inside micrometer should be used. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
B
A cylinder that is not burning fuel on the power stroke is called a(n) ______ cylinder. A. missing B. dead C. non-firing D. malfunctioning
B
A large repair facility recycles its used motor oil. Technician A says that only about one quart of high-quality oil can be recovered from each gallon of used oil that is recycled. Technician B says the recovery rate is about two and one-half quarts per gallon. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
B
A timing belt, gears, or a chain drives the engine's camshaft at __________ the rotation speed of the crankshaft. A. one-fourth B. one-half C. three-fourths D. twice
B
A. Fixed dwell B. Variable dwell C. Current-limiting dwell The ignition control module alters ignition coil dwell time with engine speed.
B
A. Pent-roof combustion chamber. B. Diesel. C. Opposed cylinder arrangement. D. Wankel. Squeezes air to ignite fuel.
B
A. Power stroke. B. BDC. C. TDC. D. Piston stroke. E. Exhaust stroke. Lowest point of piston travel.
B
All of the following are functions of a cooling system except_________. (A) providing a means for warming the passenger compartment (B) causing the engine to seize (C) removing excess heat from the engine (D) maintaining a constant engine operating temperature
B
An injector balance test shows a below normal pressure drop on one injector. Technician A says that the injector is bad and should be replaced. Technician B says to try running cleaning solution through the injector. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
B
Any vehicle engine that is not an internal combustion, four-stroke cycle, reciprocating piston type is classified as a(n) _________ engine. A. hybrid B. alternative C. low-efficiency D. experimental
B
For every pound of pressure increase, water's boiling point goes up about _________ °F. (A) 1 (B) 3 (C) 5 (D) 10
B
If the lowest normal temperature for the area is -10°F, the coolant should test to _______. A) -10°F B) -20°F (C) -30°F (D) -40°F
B
Subtraction is taking away a certain quantity from another. The amount that is left after subtraction is done is called the __________. A. product B. remainder C. subtrahend D. sum
B
Technician A says a fuel injector pulsed flow test measures steady or maximum fuel flow with the injector pintle and nozzle held fully open. Technician B says an injector maximum flow test fires an injector several times with a normal pulse width to check pintle response. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
B
The ability of a diesel fuel to ignite in cold weather is its ________ rating. A. nonane cetane octane
B
The tool used to measure small clearances or gaps between parts is called a(n) ___________. A. vernier caliper B. feeler gauge С. гuler D. hole gauge
B
Uses an electric blower fan and a system of ducts to route cool (A) Hybrid cooling passenger compartment air around the HV battery pack. system (B) Hybrid air cooling system (C) Hybrid liquid cooling
B
When working with sockets, Technician A states that a socket's "point" is the size of the square opening for the handle. Technician B states the point of a socket is the box configuration for the bolt head. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
B
Which of the following are used to support a vehicle after it has been raised? A. Floor jacks. B. Jack stands. C. Transmission jacks. D. Bumper lifts.
B
Which of the following is not a common way to classify engines? A. Cylinder arrangement. B. Carburetor design. C. Camshaft location. D. Number of cylinders.
B
Why does antifreeze cool the engine better than water?
Because freezing can cause serious cooling system and engine damage.
Why are high thermostat heating range is used in modern automobile?
Because they reduce exhausting missions in increased combustion efficiency
A(n) _________ is a 120-volt heating element mounted in the block water jacket that can be used to aid engine starting in cold weather.
Block heater
What type of thermostat has a second valve routing all the hard coolant through the radiator?
Bypass thermostat
(A) Fluid coupling fan clutch (B) Thermostatic fan clutch (C) Flex fan (D) Engine-powered fan (E) Electric cooling fan (F) Fan motor Has thin, flexible blades that alter airflow with engine speed.
C
(A) Hybrid cooling system (B) Hybrid air cooling Uses an electric water pump, small diameter hoses, and a separate radiator or heat exchanger to pull heat out of the HV battery. system (C) Hybrid liquid cooling
C
(A) Radiator core (B) Radiator tanks (C) Radiator filler neck (D) Transmission oil cooler (E) Radiator petcock An opening for adding coolant. (F) Radiator cap
C
(A) Radiator hoses (B) Molded hose (C) Flexible hose (D) Hose spring (E) Heater hoses Has an accordion shape and can be bent to different angles. (F) Hose clamps (G) Worm-drive hose clamp
C
A broken bolt must be replaced. Technician A says that thread pitch is the same as thread coarseness. Technician B says that bolt heat markings specify the tensile strength of a bolt. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
C
A pressure gauge connected to the fuel pressure test fitting (Schrader valve) shows a pressure lower than spec. Technician A says that the low pressure is likely to be caused by a faulty fuel pressure regulator. Technician B says the fuel pump is possibly at fault. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
C
A stuck thermostat can cause engine ___________. (A) overcooling (B) overheating C) Both A and B. (D) Neither A nor B.
C
A wrench that completely surrounds the bolt head or nut is called a(n) _________ wrench. A. adjustable B. open-end C. box-end D. pipe
C
A. Brake fluid. B. Engine oil. C. Dry stick lubricant. D. Chassis grease. E. Engine coolant. Used on door latches and strikers.
C
A. Crankshaft position sensor. B. Intake air temperature sensor. C. Oxygen sensor. D. Engine coolant temperature sensor. E. Airflow sensor. F. Manifold absolute pressure (MAP) sensor. G. Throttle position sensor. Checks exhaust gas for combustion efficiency.
C
A. Fixed dwell B. Variable dwell C. Current-limiting dwell The ignition control module sends high current through the ignition coil windings until a strong magnetic field is developed around the windings.
C
A. Pent-roof combustion chamber. B. Diesel. C. Opposed cylinder arrangement. D. Wankel. "Pancake" engine.
C
A. Power stroke. B. BDC. C. TDC. D. Piston stroke. E. Exhaust stroke. Highest point of piston travel.
C
An engine cranks but will not start. A spark test shows a good, strong spark. Technician A says that the no-start problem could be caused by fouled spark plugs. Technician B says that a fuel system problen is the likely cause. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
C
Atmospheric pressure, at sea level, is ______ psi. A. 12.4 B. 13.2 C. 14.7 D. 16.8
C
If the noid light does not flash when checking an electronic fuel injector's feed circuit, the cause of the problem may be all of the following except ________. A. an open in the wiring B. a bad connection C. a faulty injector D. a control module problem
C
Most diesel vehicles that use a DEF have a dosing rate of ______ per gallon of diesel fuel burned. A. 1% B. 5% C. 2% D. 10%
C
Special impact sockets and extensions are easily identified because they are _________. A. chrome B. aluminum C. flat black D. hard rubber
C
Technician A says that metric fasteners are used in vehicles assembled outside the United States. Technician B says many cars assembled in the United States use metric fasteners. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
C
The piston is mounted to the connecting rod by the __________. A. cylinder bolt B. piston skirt C. wrist pin D. cam lobe
C
The sensor used to detect engine speed is the_______. A. throttle position sensor B. manifold pressure sensor C. crankshaft position sensor D. idle valve actuator
C
The thermostat and housing are normally located on the __________ of the engine. (A) top (B) side (C) Either A or B. (D) Neither A nor
C
To convert inches to millimeters, multiply by __________. A. 6.66 B. 12.9 C. 25.4 D. 33.3
C
Which of the following is not a type of thread used on nuts and bolts? A. Coarse. B. Metric. C. Medium. D. Fine.
C
Which of the following is used with a cotter pin to prevent it from turning? A. Acorn nut. B. Self-locking nut. C. Castle nut. D. Jam nut.
C
While discussing engines, Technician A says two-stroke engines are not used in vehicles because they produce too much exhaust pollution. Technician B says two-stroke cycle engines are not used in vehicles because they have poor power output at low speeds. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
C
oil should be applied to the drill bit to help it cut faster. When using a drill press, Technician A believes Technician B believes oil should be applied to the drill bit to prevent the bit from overheating and losing hardness. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
C
___________ filters are air filters that clean the air flowing into the passenger compartment.
Cabin
A radiator _________ test measures the cap opening pressure and checks the condition of the sealing washer.
Cap pressure
A coolant heat storage system is needed to help keep the hybrid's _________ engine warm when it is not running and the vehicle is in full electric propulsion.
Coolant Heat Storage System
What does a milky white solution found in the engine oil or in valve covers indicate?
Coolant Leak
Name the three categories of cooling system problems.
Coolant leaks, Over heating, Over cooling
What trouble should be checked for in a visual inspection of the cooling system?
Coolant, loose or missing fan belt, low coolant level, abnormal water pump noises, leaves in debris covering the outside of a radiator, coolant in the oil, combustion leakage into the engine coolant.
A(n) ___________ test should be performed when signs point to a blown head gasket, cracked block, or cracked cylinder head.
Cooling system pressure
Name at least four cooling system functions that are often monitored by an OBD II system.
Coolont Level, Engine Oil, water pump delve belt tension, cnd Sigine blenke
Quick-disconnect____________ are typically used on shop air hoses.
Couplings
(A) Fluid coupling fan clutch (B) Thermostatic fan clutch Bolts to the water pump hub and pulley. (C) Flex fan (D) Engine-powered fan (E) Electric cooling fan (F) Fan motor
D
(A) Radiator hoses (B) Molded hose Frequently used in the lower radiator hose to prevent the hose from collapsing. (C) Flexible hose (D) Hose spring (E) Heater hoses (F) Hose clamps (G) Worm-drive hose clamp
D
(A) Water pump shaft (B) Water pump bearings (C) Water pump housing (D) Water pump impeller Disk with fan-like blades; it spins and produces pressure and flow. (E) Water pump gasket (F) Water pump seal (G) Water pump hub
D
A bad water pump may ________. (A) fail to circulate coolant (B) produce a grinding sound (C) leak coolant (D) All of the above.
D
A. Ethanol. B. Liquefied petroleum gas. C. Synthetic fuel. D. Gasohol. E. Hydrogen. Mixture of gasoline and alcohol.
D
A. Pent-roof combustion chamber. B. Diesel. C. Opposed cylinder arrangement. D. Wankel. Rotary engine.
D
Decimal fractions are used for making _________ measurements. A. approximate B. large C. angular D. fine
D
In a typical gasoline-powered automobile engine, how many piston strokes make up a complete cycle? A. One. B. Two. C. Three. D. Four.
D
Inner tank for cooling automatic transmission or transaxle fluid. (A) Radiator core (B) Radiator tanks (C) Radiator filler neck (D) Transmission oil cooler (E) Radiator petcock (F) Radiator cap
D
Insulated tools for use on hybrid vehicle drive trains should be rated at V. A. 240 B. 500 C. 660 D. 1000
D
Most electric cooling fans are controlled by a heat-sensitive switch located in any one of these places except the ________. (A) engine block (B) thermostat housing (C) radiator (D cylinder head
D
Power for tools used in the automotive shop is provided by _____________. A. compressed air B. hydraulics C. electricity D. All of the above.
D
Selective Catalytic Reduction systems break down toxic NOx emissions into harmless ______. A. water B. carbon C. nitrogren D. Both A and C
D
Service information gives details on how to diagnose and repair a vehicle. Which of the following is service information? A. Step-by-step procedures. B. Diagrams. C. Troubleshooting charts. D. All of the above.
D
Technician A says that the ideal, chemically correct fuel mixture is 14 parts air to 1 part fuel. Technician B says that 15 parts air to 1 part fuel is the right ratio. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
D
The deposits on a properly burning spark plug should be ______. A. blue В. Ыасk C. white D. brown
D
Tools that are of good quality are ______ than "bargain" tools. A. stronger B. lighter C. more dependable D. All of the above.
D
Voltage induced into the secondary coil windings of an ignition system can reach up to ______volts. A. 6 B. 12 C. 30,000 D. 60,000
D
When checking hose conditions, which would indicate the need for replacement? A. Softening. B. Hardening. C. Cracks or abrasions. D. All of the above.
D
When checking radiator coolant levels by removing the radiator cap, the coolant level should be _______ with the top of the filler neck. A. even B. 1/2" below C. 3/4" below D. 1" below
D
Which of the following contaminants is not likely to be found in transmission oil? A. Dirt. B. Friction material. C. Moisture. D. Gasoline.
D
Which of the following is computer-based service information? A. Data stored on a hard drive. B. CD-ROM or DVD. C. Information accessed via the Internet. D All of the above.
D
Which of the following is not a socket wrench drive size? A. 1/4" B. 3/8" C. 1/2" D. 5/8"
D
Which of the following is not a subsystem of the gasoline injection system? A. Fuel. B. Sensor. C. Air. D. Performance.
D
Why is the vehicle identification number (VIN) important? A. Can be used to track recalls, registrations, and warranty claims. B. Ensures that the correct parts are being ordered. C. Helps the technician calculate the total charges for the parts used during the repair. D. Both A and B.
D
Explain the general purpose and importance of a cooling system.
Designal to control the opperating temperture ofa mechenical and electrical assembly.
A cooling system _________ will help you decide which tests and repairs are needed and should be used when problems are difficult to locate and correct.
Dignosis Chart
What is the first step and removing a radiator?
Disconnect battery to prevent injuries from starting or shorting wires.
How is a refractometer used as a coolant strength measuring device?
Drawl cooler into the tester. Place a few drops on the measuring window. Point the test at a light and view through the tester. The scale in the refractometer will show freeze protection.
Fan
Draws air through the radiator.
(A) Radiator core (B) Radiator tanks (C) Radiator filler neck (D) Transmission oil A fitting on the bottom of the tank for draining coolant. cooler (E) Radiator petcock (F) Radiator cap
E
(A) Radiator hoses (B) Molded hose (C) Flexible hose (D) Hose spring (E) Heater hoses (F) Hose clamps (G) Worm-drive hose clamp Small-diameter hoses that carry coolant to the heater core.
E
(A) Water pump shaft (B) Water pump bearings (C) Water pump housing (D) Water pump impeller (E) Water pump gasket (F) Water pump seal (G) Water pump hub
E
A. Brake fluid. B. Engine oil. C. Dry stick lubricant. D. Chassis grease. E. Engine coolant. Generally checked by looking at the side of the overflow tank.
E
A. Ethanol. B. Liquefied petroleum gas. C. Synthetic fuel. D. Gasohol. E. Hydrogen. Highly flammable gas.
E
A. Ignition control module. B. Secondary wires. C. Ignition switch. D. Crankshaft position sensor. E. Ignition coil. F. Spark plugs. G. Primary wires. A step-up transformer that increases battery voltage to 100,000 volts or more.
E
Provides cooling action with an electric motor and a thermostatic (A) Fluid coupling fan clutch switch. (B) Thermostatic fan clutch (C) Flex fan (D) Engine-powered fan (E) Electric cooling fan (F) Fan motor
E
Instead of a bill driving water pump, hybrid cooling system is a small _________ water pump to circulate and free through the HV battery he exchanger
Electric
A(n) ___________ uses a large dc motor and an impeller to force coolant through the engine's water jackets.
Electroc Water Pump
Name the most common types of cooling systems found on modern gas, diesel, hybrid, and electric drive trains.
Engine Cooling system Supercharger cooling system, Turbocharger cooling system, HV battery cooling systen, HV moter-generator Cooling sustem, HV-engine control module cooling system.
What is the most common cause of hose hardening?
Engine Heat
Low coolant level, rust or scale, loose fan belt, collapsed lower hose, and ice in coolant are some common causes of __________.
Engine overheating
(A) Fluid coupling fan clutch (B) Thermostatic fan clutch (C) Flex fan (D) Engine-powered A small direct current motor. fan (E) Electric cooling fan (F) Fan motor
F
(A) Radiator core (B) Radiator tanks Pressurizes the water and antifreeze solution. (C) Radiator filler neck (D) Transmission oil cooler (E) Radiator petcock (F) Radiator cap
F
(A) Water pump shaft (B) Water pump bearings (C) Water pump housing (D) Water pump impeller (E) Water pump gasket Prevents coolant leakage between pump shaft and pump housing. (F) Water pump seal (G) Water pump hub
F
A. Lock washer. B. Nut. C. Tap. D. RTV. E. Cotter pin. F. Cap screw. Bolt that is threaded into a part other than a nut.
F
Hold the radiator hoses and heater hoses on their fittings. (A) Radiator hoses (B) Molded hose (C) Flexible hose (D) Hose spring (E) Heater hoses (F) Hose clamps (G) Worm-drive hose clamp
F
TRUE/FALSE In a four-stroke cycle engine, the crankshaft must make four complete rotations to complete the cycle.
FALSE
(A) Radiator hoses (B) Molded hose (C) Flexible hose (D) Hose spring (E) Heater hoses (F) Hose clamps Uses an elongated gear that engages slots in the clamp strap to allow (G) Worm-drive hose tightening around the hose. clamp
G
(A) Water pump shaft (B) Water pump bearings (C) Water pump Provides mounting place for belt pulley and fan. housing (D) Water pump impeller (E) Water pump gasket (F) Water pump seal (G) Water pump hub
G
(A) Water pump shaft (B) Water pump bearings (C) Water pump housing (D) Water pump Iron or aluminum casting that forms the main body of pump. impeller (E) Water pump gasket (F) Water pump seal (G) Water pump hub
G
Name three areas where high temperatures can develop in a hybrid's electric powertrain.
HV Battery Cells HV Motor Generator HV Power Control Module (PCM)
How does a radiator shroud keep the engine from overheating?
Helps ensure that the fan pulls air through the radiator.
When the engine is cold, the engine temperature gauge sending unit has __________ resistance.
High
An area in the engine suffering from a buildup of combustion heat is a(n) __________.
Hot spot
To measure the freezing point of the cooling system antifreeze solution, use a cooling system ____________.
Hydrometer
What is an indication of a defective temperature gauge?
If the gauge functions were grounded
Compressed air is the power source for the __________ wrench.
Impact
What is the most common reason for cracked blocks and cylinder heads?
Improper anti-freeze protection
An HV battery radiator has intake air routed through the cooling fins of the __________ or heat exchanger before it circulates over the battery packs.
Intercooler
Why is rust bad for a cooling system?
It can cause premature water pump wear.
How does the engine temperature warning light work on it many late model vehicles?
It is energized by the engine control module
Why isn't overtime bill a problem?
It will fail quickly and may damage other parts
What happens with a loose belt?
It will slip and squeal and may rotate the water pump and fan to slowly.
Why is it unsafe to move the radiator cap when the engine is hot?
Kaylynn Kuehne could spread out of the radiator filler neck, causing severe burns.
The _________ must be removed from the chuck before turning on a drill press.
Key
Name three questions to ask a vehicle owner when gathering information about troubled vehicle.
Lan you clesccibe Hhe probliem? When cloes the problem seem to occur? When diel Hhe problem to begin?
How does the cooling system pressure test work?
Low air pressure is forced into the Seal liquid cooling system, which causes cool want to pool or drip from the leak in the cooling system.
To make very accurate measurements, a(n) __________ should be used.
Micrometer
What advantages does a liquid cooling system have over an air cooling system?
More precise control of engine operating temperature. Less temperature veriation inside the engine. Reduced exhaust emissions due to better temperature control. Improved heater operation to warm passengers.
In a motor-generator cooling system, __________ that carry liquid coolant are formed or machined inside the stator housing during manufacture.
Motor-Generator Water Jackets
Snap rings are classified as _________ fasteners.
Nonthreaded
___________ Cooling systems are no longer used on automobiles.
Open
What problems can a faulty engine cooling fan cause?
Overheating, vibration, and water pump damage.
What could happen if too much pressure is pumped into the cooling system?
Part domage
What is the purpose of a bypass valve?
Permits coolant circulation to the engine on the thermostat is close
Most shops do not repair _______ radiators.
Plastic
Why is it important for an engine to warm up rapidly?
Poor combustion, part where, oil contamination, reduced fuel economy, increased emissions, and other problems
A(n) __________ is a hand-operated air pump used to pressurize the cooling system for leak detection.
Pressure tester
List three things a technician should check when diagnosing and Hybrid cooling system
Proper coolant level in the HV coolant reservoir Obstructions of the inlet and outlet air ducks to the HV battery leaks by performing pressure test
If combustion leakage is indicated, short out _________ one at a time.
Spark Plugs
How should you test a thermostatic fan clutch?
Spin the fan with the engine off. Start the engine. Verify the air is flowing through the radiator and over the engine.
A(n) _________ can be used to listen for worn, noisy water pump bearings.
Stethosccpe
TRUE/FALSE A key fits into a slot cut in a shaft and a mating part, and keeps the part from turning on the shaft.
TRUE
Why are few water pumps rebuilt?
Takes to much time and is not cost effective.
How does the coolant temperature sensor work?
The fuse box relays, and engine ECM operate the engine cooling fan motors by using the temperature sensor in the radiator
What should be done with radiator and heater hoses that have surface cracks?
The hose should be replaced.
Explain the operation of a closed cooling system.
The overflow tube is routed into the bottom of the reservoir tank. Pressure and vacuum valve action pull coolant in and out of the reservoir tank as needed.
What could occur without a cap vacuum valve?
The radiator hoses in the radiator tanks could collapse from the outside pressure.
What should happen with the temperature gage sending unit wire is grounded?
The temperature gauge should swing to hot
Name three causes of cooling system overcooling.
Thermostat stuck open shorten temperature switch locked fan clutch
Engine freeze plugs are (thinner, thicker) ___________ than the metal in the engine block and will rust through before the other engine parts.
Thinner
Bolts that have left-hand threads are ___________ by turning them counterclockwise.
Tightened
Why is a transmission oil cooler often placed in the radiator of cars with automatic transmissions or transaxles?
To prevent the transmission fluid from overheating.
How can you use a digital thermometer to check for temperatures and cooling system operation?
Touch the thermostat probe to the engine near the thermostat and to thermostat outlet hose.
Radiator
Transfers engine coolant he to outside air.
Many on-board diagnostic systems will trip a(n) ________ when certain cooling-related circuits are operating or seem to be operating out of range.
Trouble Code
A spark plug wire should always be removed by pulling on the boot, not the wire itself.
True
In a direct ignition system, the need for spark plug wires is eliminated.
True
TRUE/FAISE If certain fluids are not changed at recommended intervals, they can cause damage to vehicle systems.
True
TRUE/FAISE If examination reveals rusty engine coolant, the system should be drained and filled with new coolant.
True
TRUE/FALSE A crank damper helps prevent crankshaft vibration.
True
TRUE/FALSE A frequent cause of fuel injection system problems is high resistance due to corrosion at the terminals on the wiring harness.
True
TRUE/FALSE An impedance test indicates how quickly the injector will open to spray fuel.
True
TRUE/FALSE Firing order of the cylinders is sometimes cast into the metal of the intake manifold.
True
TRUE/FALSE Fuel pressure in an injection system can be as high as 2000 psi.
True
TRUE/FALSE Fuel tanks should be emptied before dismounting them from the vehicle for service.
True
TRUE/FALSE Grasp a spark plug wire by the boot to disconnect it from the spark plug.
True
TRUE/FALSE In a direct injection system, the fuel is forced into the combustion chamber itself.
True
TRUE/FALSE In modern gasoline direct injection systems, it is possible to control engine speed without a throttle valve in the intake tract.
True
TRUE/FALSE One reason for a poor injector spray pattern is a dirty nozzle.
True
TRUE/FALSE Problems with clogged fuel filters are most apparent at higher speeds.
True
TRUE/FALSE Throttle valves are used on gasoline engines, but not on diesel engines.
True
TRUE/FALSE Timing advance is usually set several degrees before TDC.
True
TRUE/FALSE When gasoline is in its liquid state, a spark will not ignite it.
True
TRUE/FALSE You should make a fuel line in the shop only if a factory replacement line is not available.
True
TRUE/FALSE You should not use silicone-based sealers on or around the exhaust system components.
True
True or False? When an HV engine control module circuit gets too hot, power transistors can go into thermal runaway, capacitors and resistors can burn, and printed circuit boards can burn out.
True
True/False Air-powered tools should always be lubricated before use.
True
True/False Slant engines and V-type engines allow lower hood lines than inline engines.
True
True/False The abbreviation SOHC stands for single overhead cam.
True
True/False The cylinders in each bank of a W-type engine are offset.
True
How should you check for worn water pump bearings?
Try to wiggle the fan or pump pulley up and down.
What is an air cooling system?
Uses large cylinder cooling fans and outside air to remove excess heat from the engine.
A gauge tester is a special testing device with a(n) ____________.
Variable resistor
What kind of impellers are sometimes used to reduce engine power consumption?
Water Pump
What does antifreeze prevent?
Winter freezer, rust and corrosion, lubricates the water pump, and cool the engine.
