HD2 Cooling Lubrication Test

Gallery plugs and frost plugs should be installed:

dry

with the use of a sealant

by the gentle use of a hammer

by using the old plug as a driver

Correct! Wrong!

If a water pump impeller is installed closer to the pump housing than specifications, it may cause:

bearing failure

housing damage

insufficient water flow

aeration of the coolant

Correct! Wrong!

Thermostats are installed:

between the cylinder head(s) and the radiator

between the pump inlet and the radiator

between the pump outlet and inlet

none of the above

Correct! Wrong!

Under increased surface pressure, water, fuel, brake fluid and other liquids, will boil or vaporize at:

a lower temperature

a higher temperature

the same temperature as in the case of no pressure

the temperature as prescribed by the altitude

Correct! Wrong!

Removing the radiator cap on a hot engine will often result in a large loss of coolant and create a danger for serious burns. This occurs because

pressure created by the water pump pushes the coolant out

the hot coolant has expanded, pressurizing the system

steam created in the system, escapes

the design of the rad caps

Correct! Wrong!

What is the approximate boiling point of water with an eight pound pressure cap at sea level?

222 F (105 C)

236 F (113 C)

242 F (117 C)

252 F (122 C)

Correct! Wrong!

Water pumps on mobile equipment are usually ___________ type pumps.

centrifugal

positive displacement

vane

piston

Correct! Wrong!

The primary reason shrouding is used around a fan is to:

prevent personal injury

direct the air flow through the radiator

provide support for hoses and wire harnesses

none of the above

Correct! Wrong!

Which of the following is an anti-friction bearing?

connecting rod bearing

main bearing

cam bearing

water pump bail bearing

Correct! Wrong!

When checking fan belts, not only the condition is checked but also the:

tension

brand name

alignment

A and C are correct

Correct! Wrong!

The purpose of the cooling system is to:

regulate engine temperature

prevent overheating

provide cooling for accessory equipment

all of the above

Correct! Wrong!

The purpose of a radiator pressure cap is to:

contain the coolant in the system

raise the boiling point of the coolant

allow surplus coolant to re-enter the radiator when coolant cools

all of the above

Correct! Wrong!

Any cooling system liquid, water or antifreeze, should have as a necessary ingredient(s).

anti-foaming agent

sludge dispersant

corrosion inhibitors

all of the above

Correct! Wrong!

When an engine fan switch in the cab is moved to the manual on position, the shutters should open (if equipped) and the fan should be activated immediately.

True

False

Correct! Wrong!

A low silicate antifreeze must be used in diesel engines to prevent silicate breakdown and a subsequent:

freezing

plugging of the oil/water heat exchanger

oil pump failure

all of the above

Correct! Wrong!

Water pumps may be either belt or gear driven.

True

False

Correct! Wrong!

A customer complains that his engine fan does not always kick in on and that his engine temperature rises too high. By turning his engine fan switch to manual he is able to kick his fan in. The item most likely at fault here is the:

engine fan temperature sending unit

thermostat

radiator plugged with debris

electric over air switch

Correct! Wrong!

Oils, antifreeze and other fluids may boil or vaporize, either because of very low pressure (vacuum) conditions, or by contact with very hot surfaces. This may produce or cause erratic operational problems and potential significant damage. This condition is referred to as:

aeration

percolation

cavitation

resuscitation

Correct! Wrong!

The tester in the figure below may be used to test the following items except:

cooling system leaks

radiator cap pressure relief valve

coolant specific gravity

heater core leaks

Show hint

Correct! Wrong!

A vehicle has an overheating problem. The vehicle sometimes overheats within a short time after the engine is started. Other times, the engine starts and the cooling system operates normally. What is the likely cause?

the water pump can be working intermittently

the thermostat is occasionally sticking and needs replacement

the rad cap is not maintaining its proper pressures

a rad hose may have collapsed, blocking flow

Correct! Wrong!

While discussing cooling system flushing, it was determined the most correct method is to:

to properly flush the radiator, reverse flushing should be performed to dislodge deposits

a flush means draining the coolant and refilling the system with the new antifreeze

some chemical cleaners should be added to the system to remove scale

drain the system, refill with water, follow the directions of the flushing solution, drain and reverse flush and add fresh coolant

Correct! Wrong!

When filling a cooling system, Technician A says to fill half the system capacity with pure antifreeze and the remaining amount with water. Technician B says to use at least a 50/50 mixture of water to coolant mixture to fill the cooling system. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

Technician A says a defective water pump bearing may cause a growling noise when the engine is idling. Technician B says the water bearing may be ruined by coolant leaking past the pump seal. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

The water return valve in the radiator cap is stuck closed. The result could be:

collapsed upper radiator hose after the engine is shut off

excessive cooling system pressure at normal engine temperature

engine overheating when operating under heavy load

engine overheating during extended idle periods

Correct! Wrong!

A vacuum operated blend door actuator diaphragm:

is designed to bleed vacuum at a rate of 3 in. Hg. per hour

contains a small electric motor to return the actuator to the normal position

should hold vacuum

is porous to allow moisture to evaporate

Correct! Wrong!

Milky oil on the engine dipstick indicates:

the wrong oil grade was installed

an internal coolant leak

air in the cooling system

a water pump leak

Correct! Wrong!

There is complaint of insufficient heat in the cab. Technician A says that air trapped in the cooling system could be the cause. Technician B says that a closed or defective water hand valve could be the cause. What is right?

Technician A

Technician B

Both Technician A and B

Neither Technician A nor B

Correct! Wrong!

A smeary film on the windshield and a sweet odor in the cab may be evidence of:

an evaporator coil leak

water valve leak

a heater core leak

a restricted drain hose

Correct! Wrong!

The heater blower motor operates only at high speed or off. Technician A says that a defective blower switch could be the cause. Technician B says that a defective blower resistor could be the cause. Who is right?

Technician A

Technician B

Both Technician A and B

Neither technician A nor B

Correct! Wrong!

An air-activated engine fan clutch fails to engage. Technician A says that the temperature sensitive air valve may be defective. Technician B says there may be a problem with the air supply system. Who is right?

Technician A

Technician B

Both technician A and B

Neither technician A nor B.

Correct! Wrong!

What can be determined with the engine coolant by checking it with pH strips?

freezing point

head gasket failure

acidity

coolant age

Correct! Wrong!

What is the most common reason for replacing the water pump?

the pump impeller becomes deteriorated from corrosion.

the water pump to engine block gasket fails.

the hub separates from the water pump shaft.

failure of the mechanical seal.

Correct! Wrong!

At sea level, a cooling system that operates with a 10 lbs. radiator cap will have:

a coolant boiling temperature of 242 degrees F

a coolant boiling temperature of 222 degrees F

a lower operating temperature than a 6 lbs cap

a coolant boiling system aeration

Correct! Wrong!

A surge tank in a cooling system is used to:

eliminate the need for cooling system pressure

eliminate the need for a thermostat

add to the cooling capacity of the radiator

reduce cooling system aeration

Correct! Wrong!

When refilling the cooling system, to ensure that the system is full of coolant after an engine block has been drained, a technician should:

fill rad, test drive and then check coolant level

bleed air from the highest part of engine

fill via the upper rad hose

trust that the engine designers know that engines will fill properly

Correct! Wrong!

Upon inspection, a technician finds that there is a lot of engine oil mixed with the coolant in the radiator, with no other obvious indicators. The most likely starting place to look for the problem is the:

transmission cooler lines.

engine oil cooler

engine head gasket

the air compressor

Correct! Wrong!

A cooling system is pressurized with a pressure tester to locate a coolant leak. After 15 minutes, the tester gauge has dropped from 15 to 5 psi, and there are no visible signs of coolant leaks in the engine compartment. Which of these is not likely to be at fault?

the heater core may be leaking

the engine may have a leaking head gasket

the coolant lines to the differential may be leaking

the oil to water heat exchanger may be leaking

Correct! Wrong!

Before draining oil, the engine should be brought to operating temperature so that:

the machine is easier to work on

all of the fittings will move easily

you don't have to warm it up to move it

the oil will hold contaminants and flow easily

Correct! Wrong!

The filter type that is removed and replaced as a complete filter unit is:

the replaceable element filter

the spin-on filter

the oil bath filter

the cartridge element filter

Correct! Wrong!

The first item to check for when starting an engine after an oil change is:

oil level

oil pressure

oil leaks

oil analysis

Correct! Wrong!

A technician says that if fuel is leaking into the engine oil crankcase, severe engine damage will occur. One of the early indicators is the engine oil will:

affect the oil pressure at an idle

likely interfere with the engine oil cooler

will cause engine overheating

cause oil cavitation in the pump

Correct! Wrong!

The degree of filtration in a filter is measured in:

electrons

protons

neutrons

microns

Correct! Wrong!

An oil pressure gauge utilizing a bourdon tube would be a (n):

mechanical gauge

electrical gauge

balancing coil gauge

electromagnetic gauge

Correct! Wrong!

Technician A says that the function of engine oil is to reduce friction and act as a cleaning agent. Technician B says that the function of the engine oil is to seal piston rings and remove heat from engine components. Who is correct?

Technician A

Technician B

Both A and B

Neither A nor B

Correct! Wrong!

Approximately ___________of the amount of oil an engine oil pump delivers passes through a by-pass oil filter.

10%

25%

50%

100%

Correct! Wrong!

Engine full flow oil filtering systems are designed that, in the event that the filter becomes plugged or the oil is too cold:

the relief valve will open and return oil to the crankcase

the bypass valve will open and unfiltered oil will lubricate the engine

the engine will shutdown

the bypass filter will become the full flow filter

Correct! Wrong!

The large diesel engine''s oil pump is generally ____________ driven.

belt

gear

chain

clutch

Correct! Wrong!

What type of oil pumps are generally used on H.D. diesel engines?

positive displacement centrifugal pump

positive displacement gear pump

non positive displacement gear pump

non positive displacement centrifugal pump

Correct! Wrong!

An excessively high oil level may result in:

poor engine brake performance

oil pressure gauge fluctuation

higher oil temperature

all of the above

Correct! Wrong!

A low oil pressure reading on the gauge when the engine is idling and a normal reading when the engine is revved up may indicate:

excessive engine wear.

wrong grade of oil.

high oil temperature.

all of the above.

Correct! Wrong!

Gallery plugs and frost plugs should be installed:

If a water pump impeller is installed closer to the pump housing than specifications, it may cause:

Thermostats are installed:

Under increased surface pressure, water, fuel, brake fluid and other liquids, will boil or vaporize at:

Removing the radiator cap on a hot engine will often result in a large loss of coolant and create a danger for serious burns. This occurs because

What is the approximate boiling point of water with an eight pound pressure cap at sea level?

Water pumps on mobile equipment are usually ___________ type pumps.

The primary reason shrouding is used around a fan is to:

Which of the following is an anti-friction bearing?

When checking fan belts, not only the condition is checked but also the:

The purpose of the cooling system is to:

The purpose of a radiator pressure cap is to:

Any cooling system liquid, water or antifreeze, should have as a necessary ingredient(s).

When an engine fan switch in the cab is moved to the manual on position, the shutters should open (if equipped) and the fan should be activated immediately.

A low silicate antifreeze must be used in diesel engines to prevent silicate breakdown and a subsequent:

Water pumps may be either belt or gear driven.

A customer complains that his engine fan does not always kick in on and that his engine temperature rises too high. By turning his engine fan switch to manual he is able to kick his fan in. The item most likely at fault here is the:

Oils, antifreeze and other fluids may boil or vaporize, either because of very low pressure (vacuum) conditions, or by contact with very hot surfaces. This may produce or cause erratic operational problems and potential significant damage. This condition is referred to as:

The tester in the figure below may be used to test the following items except:

A vehicle has an overheating problem. The vehicle sometimes overheats within a short time after the engine is started. Other times, the engine starts and the cooling system operates normally. What is the likely cause?

While discussing cooling system flushing, it was determined the most correct method is to:

When filling a cooling system, Technician A says to fill half the system capacity with pure antifreeze and the remaining amount with water. Technician B says to use at least a 50/50 mixture of water to coolant mixture to fill the cooling system. Who is right?

Technician A says a defective water pump bearing may cause a growling noise when the engine is idling. Technician B says the water bearing may be ruined by coolant leaking past the pump seal. Who is right?

The water return valve in the radiator cap is stuck closed. The result could be:

A vacuum operated blend door actuator diaphragm:

Milky oil on the engine dipstick indicates:

There is complaint of insufficient heat in the cab. Technician A says that air trapped in the cooling system could be the cause. Technician B says that a closed or defective water hand valve could be the cause. What is right?

A smeary film on the windshield and a sweet odor in the cab may be evidence of:

The heater blower motor operates only at high speed or off. Technician A says that a defective blower switch could be the cause. Technician B says that a defective blower resistor could be the cause. Who is right?

An air-activated engine fan clutch fails to engage. Technician A says that the temperature sensitive air valve may be defective. Technician B says there may be a problem with the air supply system. Who is right?

What can be determined with the engine coolant by checking it with pH strips?

What is the most common reason for replacing the water pump?

At sea level, a cooling system that operates with a 10 lbs. radiator cap will have:

A surge tank in a cooling system is used to:

When refilling the cooling system, to ensure that the system is full of coolant after an engine block has been drained, a technician should:

Upon inspection, a technician finds that there is a lot of engine oil mixed with the coolant in the radiator, with no other obvious indicators. The most likely starting place to look for the problem is the:

A cooling system is pressurized with a pressure tester to locate a coolant leak. After 15 minutes, the tester gauge has dropped from 15 to 5 psi, and there are no visible signs of coolant leaks in the engine compartment. Which of these is not likely to be at fault?

Before draining oil, the engine should be brought to operating temperature so that:

The filter type that is removed and replaced as a complete filter unit is:

The first item to check for when starting an engine after an oil change is:

A technician says that if fuel is leaking into the engine oil crankcase, severe engine damage will occur. One of the early indicators is the engine oil will:

The degree of filtration in a filter is measured in:

An oil pressure gauge utilizing a bourdon tube would be a (n):

Technician A says that the function of engine oil is to reduce friction and act as a cleaning agent. Technician B says that the function of the engine oil is to seal piston rings and remove heat from engine components. Who is correct?

Approximately ___________of the amount of oil an engine oil pump delivers passes through a by-pass oil filter.

Engine full flow oil filtering systems are designed that, in the event that the filter becomes plugged or the oil is too cold:

The large diesel engine''s oil pump is generally ____________ driven.

What type of oil pumps are generally used on H.D. diesel engines?

An excessively high oil level may result in:

A low oil pressure reading on the gauge when the engine is idling and a normal reading when the engine is revved up may indicate:

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Heavy-Duty Mechanic - Trucks & Equipment