Advanced Engine Repair

Normal oil pump pressure in an engine is ________ PSI.

10-60

Hydrodynamic lubrication, created by the wedging action of oil between the crankshaft journal and bearing, can be as high as ________ PSI.

1000

The normal operating temperature (coolant temperature) of an engine equipped with a 195°F thermostat is ________.

195F to 215F

Cranking vacuum should be ________.

2.5 in. Hg or higher

Some vehicles use an oil cooler the help maintain proper oil temperature. Oil temperature range should be ________.

212F to 300F

A typical oil pump can pump how many gallons per minute?

3 to 6 gallons

Engine oil pressure at 3500 RPM should be at least ________ PSI.

35

A good engine should produce how much compression during a running (dynamic) compression test at idle?

60 to 90 psi

Intake manifold gaskets on a V-type engine can fail due to what factor?

All of the above

What precautions should be adhered to when installing a plastic intake manifold?

All of the above

When replacing a timing belt, many experts and vehicle manufacturers recommend that what other part(s) should be replaced?

All of the above

Why is a dry sump system is used in some high-performance vehicles?

All of the above

A thermostat can fail in which way?

Any of the above

Which of these smoke colors indicates excessive fuel being burned in the combustion chamber?

Black

Which of these smoke types indicates oil being burned in the combustion chamber?

Blue

What type of oil pump is driven by the crankshaft?

Both A and B

Lower than specified oil pressure is measured on a high mileage engine. Technician A says that worn main or rod bearings could be the cause. Technician B says that a clogged oil pump pickup screen could be the cause. Which technician is correct?

Both Techs

Technician A says that a dirty or blocked radiator can cause the engine to overheat. Technician B says that overheating can be caused by a defective water pump. Who is right?

Both Techs

Technician A says that a leaking head gasket can be tested for by using a chemical tester. Technician B says that a leaking head gasket can be found using an exhaust gas analyzer. Who is correct?

Both Techs

Technician A says that cooling fans are designed to draw air through the radiator to aid in the heat transfer process. Technician B says that drawing the heat from the coolant transfers this heat to the outside air through the radiator. Who is right?

Both Techs

Technician A says that the lubricating system forms a seal between the piston rings and cylinder walls. Technician B says the lubricating system helps cool engine parts. Who is right?

Both Techs

Technician A says that the paper test could detect a burned valve. Technician B says that a grayish white stain on the engine could be a coolant leak. Who is right?

Both Techs

Technician A says to use lineman's gloves when servicing the high voltage system on hybrid electric vehicles. Technician B says that hybrid vehicles have a plug to disable the high voltage system before service. Which technician is correct?

Both Techs

Two technicians are discussing oil leaks. Technician A says that an oil leak can be found using a fluorescent dye in the oil with a black light to check for leaks. Technician B says that a white spray powder can be used to locate oil leaks. Who is right?

Both Techs

Two technicians are discussing oil pumps. Technician A says that many oil pumps are driven directly off the front of the crankshaft. Technician B says that some are driven from the distributor if the engine uses a distributor-type ignition system. Which technician is correct?

Both Techs

What type of pump is a water pump?

Centrifugal Pump

The water pump uses which of these reactionary forces actions to circulate the coolant?

Centrifugal force

An engine oil cooler usually uses what to cool the oil?

Coolant

The upper radiator hose collapses when the engine cools. What is the most likely cause?

Defective radiator pressure cap

What can be done to prevent air from getting trapped in the cooling system when the coolant is replaced?

Either B or C

What type of oil pump is pictured here?

External Gear

In a dry sump system there is no oil at all in the oil pan.

False

Oil consumption of about 1 quart every 700 miles is normal for a motor vehicle.

False

The oil pressure relief valve is located on the outlet of the oil filter.

False

All of these are procedures that can help a service technician to diagnose engine faults, EXCEPT ________.

Fuel level test

What part should be removed to test cylinder compression on a diesel engine?

Glow plug or injector

How is diesel fuel ignited in a warm diesel engine?

Heat of compression

An automotive engine that running at too high of a temperature will have which of these?

High Oil Consumption

Which diesel system supplies high-pressure diesel fuel to all of the injectors all of the time?

High pressure common rail

An intake manifold gasket has been replaced due to a vacuum leak. Which of the following steps uses a scan tool to complete the job?

Idle relearn

A hybrid electric vehicle has a feature that could allow the engine to start and run without warning. This feature is called________.

Idle stop

A technician is preparing to do an oil change on a hybrid vehicle. What special precaution needs to be taken BEFORE performing this service?

Make sure the ignition is "OFF" and the key is removed from the ignition switch

Selective catalytic reduction (SCR) uses urea injection to reduce ________ emissions.

NOx

Technician A says that glow plugs are used to help start a diesel engine and are shut off as soon as the engine starts. Technician B says that the glow plugs are turned off as soon as a flame is detected in the combustion chamber. Which technician is correct?

Neither Technician

Technician A says that the cooling system should be tested for leaks using a pressure-operated pressure tester. Technician B says that the freezing and boiling point of the coolant can be tested using a thermometer. Who is right?

Neither Techs

Most mechanical engine problems are caused by which of these?

Overheating

A defective thermostat can cause the powertrain control module (PCM) to set what diagnostic trouble code (DTC)?

P0128

What diagnostic trouble code (DTC) could be set if the thermostat is defective?

P0128

The torque specification for many plastic intake manifolds are in what unit?

Pound-inches

A technician is performing a cylinder leak test. The leakage on all cylinders is less than 10% on all cylinders except for one, which indicates 80% leakage. What should the technician do?

Repeat the test (cylinder was not at TDC)

Hybrid electric vehicles usually require special engine oil of what viscosity?

SAE 0W-20

Which of these takes place during regeneration in a diesel particulate filter (DPF)?

Soot is being burned

Technician A says that oil pressure is normally higher when the engine is cold. Technician B says that normal engine oil pump pressure ranges from 20 to 80 psi (200 to 400 kPa) or 20 psi for every 1000 engine RPM. Who is right?

Tech A

Technician A says that the first step in diagnosing engine condition is to perform a thorough visual inspection. Technician B says that oil leaks can be found by measuring straight up from where the oil drips on the floor. Who is right?

Tech A

Technician A says that the purpose and function of the cooling system is to maintain proper engine operating temperature. Technician B says that the water pump controls engine coolant temperature by opening at its rated opening temperature to allow coolant to flow through the radiator. Who is right?

Tech A

A customer complains that the heater works sometimes, but sometimes only cold air comes out while driving. Technician A says that the water pump is defective. Technician B says that the cooling system could be low on coolant. Who is right?

Tech B

A vehicle's oil pressure warning light is on. Technician A says that the pressure sending unit should be replaced and the vehicle re-checked. Technician B says that a mechanical oil pressure gauge should be used to check the oil pressure before replacing the sending unit. Which technician is correct?

Tech B

Technician A says that a compression test can be used to test the condition of connecting rods. Technician B says that a cylinder leakage test fills the cylinder with compressed air, and the gauge indicates the percentage of leakage. Who is right?

Tech B

Technician A says that during a power balance test, the cylinder that causes the biggest RPM drop is the weak cylinder. Technician B says that if one spark plug wire is grounded out and the engine speed does not drop, a weak or dead cylinder is indicated. Who is right?

Tech B

Technician A says that the automotive water pump is a positive displacement-type pump. Technician B says that the coolant mix should be a 50/50 split between antifreeze and water. Who is right?

Tech B

Technician A uses a steel gasket scraper on aluminum engine parts. Technician B uses a plastic or wood scraper on aluminum engine parts. Which technician is correct?

Tech B

Which of the following may be a symptom of injector O-ring trouble in a HEUI system?

The fuel filter element turning black

A water pump can fail to provide the proper amount of coolant flow through the cooling system if what has happened?

The impeller blades are worn or slipping on the shaft

Which statement is TRUE about thermostats?

The temperature marked on the thermostat is a temperature at which the thermostat should start to open.

What is the purpose of the lower air dam in the front of vehicles?

To help direct the air through the radiator

Which of the following is NOT a function of engine mounts?

Transfer engine vibrations into the body of the vehicle

Oil leaving the oil filter is delivered to the oil passages.

True

The use of a variable vane turbocharger allows the elimination of the ________.

Turbocharger wastegate

Which of the following is the LEAST LIKELY to cause an engine noise?

Vacuum leak

In typical engine lubrication systems, what components are the last to receive oil and the first to suffer from a lack of oil or oil pressure?

Valve train components

What fuel system component is used in a vehicle equipped with a diesel engine that is not usually used on the same vehicle when it is equipped with a gasoline engine?

Water-fuel separator

What color exhaust smoke occurs most often during cold engine starts because the smoke is usually condensed fuel droplets?

White

A skewed thermostat means it is_____?

Working, but not at the correct temperature

A good reading for a cylinder leakage test would be ________.

all cylinders below 20% leakage

Water pumps ________.

are driven by the engine crankshaft or camshaft

Coolant drained from the cooling system when replacing a thermostat or water pump should be ________.

disposed of properly or recycled

The oil drains back to the oil pan through ________.

drainback holes

A smoothly operating engine depends on ________.

equal compression between cylinders

When changing a timing belt it is recommended that the ________ also be replaced.

front crankshaft seal

Oil passages in an engine block are called ________.

galleries

Some of the wiring under the hood of a late model vehicle is encased in bright orange covering. This indicates a ________.

high voltage electrical system

Pressurizing the automotive cooling system results in ________.

increased coolant boiling point

The oil pressure relief valve controls ________ oil pressure in the lubrication system.

maximum

Electric cooling fans are typically commanded on and off by the ________.

powertrain control module (PCM)

If a cooling system operates at too cool of a temperature, the engine will ________.

produce acids in the oil

A vehicle has set DTC P0172, indicating a lean exhaust and a vacuum leak is suspected. This can be diagnosed by introducing ________ around the intake manifold gasket.

propane

Heat transfer is improved from the coolant to the air when the ________.

temperature difference is great

On some engines equipped with a timing belt, the belt also may drive the______.

water pump

During a dry compression test the first puff of the test shows 50 PSI and the maximum reading after 4 strokes is 150 PSI. This indicates ________.

weak piston rings

The low oil pressure warning light usually comes on ________.

whenever oil pressure drops dangerously low (4 to 7 psi)