Engine Repair: Chapter 14

TRUE OR FALSE: A pressure relief (regulator) valve, located inside the oil filter, is designed to limit engine oil pressure.

FALSE

TRUE OR FALSE: The radiator cap should be removed only when the engine is at full operating temperature.

FALSE

TRUE OR FALSE: When crankcase pressure is abnormally low, oil is forced out through joints that normally would not leak.

FALSE

TRUE OR FALSE: ECD (electrochemical degradation) usually occurs within two inches of the hose end.

TRUE

TRUE OR FALSE: Most hybrids require special coolants that serve to cool the engine and inverter assembly.

TRUE

TRUE OR FALSE: Normally between 30 and 50 percent of the engine's coolant remains in the system after the radiator has been drained.

TRUE

TRUE OR FALSE: One purpose of the oil pan is cooling the oil through its contact with the outside air.

TRUE

TRUE OR FALSE: The water pump on many late model engines is driven by the engine's timing belt or timing chain.

TRUE

TRUE OR FALSE: To save power and reduce noise levels, most late model vehicles have an electrically driven cooling fan.

TRUE

TRUE OR FALSE: Used coolant cannot be poured down the drain or into a sewer and must be reclaimed or recycled.

TRUE

TRUE OR FALSE: Water pump failure can be caused by a bent fan blade.

TRUE

When must a thermostat be fully opened? a) 20 degrees Fahrenheit (11.1 degrees Celsius) above the "start to open temperature" b) 3 degrees Fahrenheit (1.67 degrees Celsius) above or below its temperature rating c) 3 degrees Fahrenheit (1.67 degrees Celsius) above its temperature rating d) 20 degrees Fahrenheit (11.1 degrees Celsius) below the "start to open temperature"

a) 20 degrees Fahrenheit (11.1 degrees Celsius) above the "start to open temperature"

During routine service a small amount of engine oil is found in the air cleaner housing. Technician A says the PCV valve may be clogged. Technician B says the engine could be overfilled with oil. 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 a dry sump lubrication system eliminates the possibility of oil sloshing and possible oil starvation during hard cornering, braking, and acceleration. Technician B says a dry sump lubrication system allows the engine to be mounted higher in the frame. Who is correct? a) A only b) B only c) both A and B d) neither A nor B

a) A only

The petcock valve is located _____. a) at the bottom of the radiator b) at the base of thermostat housing c) at the bottom of the heater core d) below the water pump

a) at the bottom of the radiator

What does blue exhaust smoke indicate? a) oil entering the combustion chamber b) coolant entering the combustion chamber c) excessively rich fuel mixture d) All the answers are correct.

a) oil entering the combustion chamber

If the fan shroud is removed from a vehicle, _____. a) the engine will overheat during prolonged idling b) the engine will overheat at highway speeds c) both A and B d) neither A nor B

a) the engine will overheat during prolonged idling

Which of the following cooling system hoses is normally subjected to the roughest service life? a) upper radiator b) lower radiator c) heater inlet d) bypass

a) upper radiator

When testing a radiator cap, with the rated pressure applied, the cap should hold that pressure for at least _____. a) 30 seconds b) 1 minute c) 5 minutes d) 20 minutes

b) 1 minute

For every 1 pound of pressure put on engine coolant, the boiling point of the coolant is raised about _____ degrees Fahrenheit (_____ degrees Celsius). a) 2, 1.1 b) 3, 1.7 c) 4, 2.2 d) 5, 2.8

b) 3, 1.7

The typical recommended mixture of water and antifreeze is ______. a) 30/70 b) 50/50 c) 40/60 d) 60/40

b) 50/50

Technician A says cooling system pressure is regulated by the pressure relief valve in the water pump. Technician B says cooling system pressure is regulated by the radiator cap. 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 a car with a very noisy water pump. The pump makes a lot of noise but is not leaking coolant. Technician A says the owner can continue to drive the vehicle as long as there are no signs on coolant leakage. Technician B says the water pump must be replaced immediately. Who is correct? a) A only b) B only c) both A and B d) neither A nor B

b) B only

During engine warm-up, when the thermostat is closed, _____. a) coolant flows through the radiator b) coolant flows through the bypass passage c) both A and B d)neither A nor B

b) coolant flows through the bypass passage

Which hose typically has a spiral wire reinforcement? a) upper radiator hose b) lower radiator hose c) Both A and B d) Neither A nor B

b) lower radiator hose

Two technicians are discussing a vehicle with an overheating problem. There are no leaks, internal or external. The belts are in good condition, and the radiator has been removed and flow tested. Everything appears to be in good condition. A new thermostat was installed, but it did not cure the problem. What is most likely the problem? a) The impeller could be slipping on the water pump shaft b) The impeller blades could be corroded c) The impeller could be slipping on the water pump shaft or the impeller blades could be corroded d) None of the answers is correct

c) The impeller could be slipping on the water pump shaft or the impeller blades could be corroded

Sludge is being discussed. Technician A says sludge results from the oxidation of oil. Technician B says a slight buildup on the underside of the oil fill cap is normal. 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 a cooling system pressure tester is used to test for leaks in the radiator, hoses, water pump, thermostat, and engine assembly. Technician B say the cooling system pressure tester is used to check the operation of the relief valve in the radiator cap. 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 an electric cooling fan may come on at any time without warning, even if the engine is not running. Technician B says an electric cooling fan may be controlled by the engine control computer. 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 high crankcase pressure can be caused by worn piston rings. Technician B says low crankcase pressure can be caused by a faulty PCV system. 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 oil filters. Technician A says the oil filter has an anti-drain-back valve that prevents the oil in the filter and engine oil passages from returning to the sump when the engine is shut down. Technician B says the oil filter has a bypass valve that in the event the filter becomes plugged, oil can flow directly to the bearings. Who is correct? a) A only b) B only c) both A and B d) neither A nor B

c) both A and B

Water pumps are _____ type pumps. a) positive displacement b) negative displacement c) centrifugal d) reciprocating

c) centrifugal

If the engine overheats during long periods of idling but runs normally at highway speeds, the problem is most likely defective _____. a) thermostat b) water pump c) cooling fan d) radiator

c) cooling fan

In most automotive applications, the water pump is driven by the ______. a) flywheel b) camshaft c) crankshaft d) impeller

c) crankshaft

Most manufacturers recommend that cooling systems should be drained, flushed, and filled every ______. a) six months b) year c) two to four years d) five years

c) two to four years

Oil coolers are normally found on _____ vehicles. a) diesel b) high performance c) turbocharged d) All the answers are correct.

d) All the answers are correct.

Which of the following is a function of the engine's lubrication system? a) holds an adequate supply of oil b) removes contaminants from the oil c) delivers oil to all necessary areas of the engine d) All the answers are correct.

d) All the answers are correct.

Which of the following tools can be used to test the operation of the thermostat without removing it from the engine? a) black light and leak detector dye b) combustion leak check dye c) cooling system pressure tester d) digital infrared thermometer

d) digital infrared thermometer

To drain a cooling system that does not have a petcock or drain plug in the radiator, ______. a) remove the coolant temperature sensor b) remove the heater return hose c) disconnect the water pump inlet hose d) disconnect the lower radiator hose

d) disconnect the lower radiator hose