Engine Start-up and Troubleshooting

A leaking seal or gasket on a pre-combustion chamber may cause:

coollant to leak into the main combustion chamber

combustion to leak into the coolant

external coolant leakage

any of the above

Correct! Wrong!

Incorrectly adjusted engine valves may cause:

low power

burnt valves

valve train noise

all of the above

Correct! Wrong!

Technician A says that excessive back pressure in the exhaust system will cause an increase in engine temperature and a decrease in engine power. Technician B says that excessive exhaust back pressure will cause denser, more compressed exhaust which may cause an engine to idle roughly. Who is correct?

Technician A

Technician B

Both A and B

Neither A nor B

Correct! Wrong!

Which of the following is NOT a cause of low engine power?

poor quality fuel

restricted air cleaner

low exhaust back pressure

incorrect fuel injector timing

Correct! Wrong!

Which of the following could cause an engine to misfire?

air in the fuel system

incorrect lubricating oil viscosity

low exhaust back pressure

air in the cooling system

Correct! Wrong!

Excessive valve lash will NOT cause which of the following?

advance valve timing

noise

reduced engine powerpoor fuel economy

poor fuel economy

Correct! Wrong!

Excessive piston to cylinder liner clearance can cause:

piston slap

pin knock

ring slap

all of the above

Correct! Wrong!

Which of the following could cause early valve opening?

rocker arm wear

cam lobe wear

valve seat and face wear.

camshaft drive gear wear

Correct! Wrong!

To help diagnose and determine the cause of a deep engine knock, you should first:

check oil pressure

isolate the noise

check for an engine misfire

put it in gear to load the engine

Correct! Wrong!

Inadequate coolant treatment may cause:

linear erosion

piston erosion

injector erosion

engine bearing erosion

Correct! Wrong!

One of the first things to check when an engine is reported to have excessive vibration is the:

vibration damper and front drive system

flywheel balance and the clutch balance weights

main bearing bolt torque

cylinder head and manifold torque

Correct! Wrong!

A technician finds that a viscous type vibration damper has a dent in it, the proper procedure would be to:

weld a bolt to the dent, pull the dent out and cut the bolt off

fill the dent in with fibre glass

replace the vibration damper

no repairs are necessary, reuse the damper

Correct! Wrong!

Valve and seat wear would:

increase the tappet clearance and retard the valve timing.

decrease the tappet clearance and advance the valve timing.

increase valve spring tension.

not affect the valve timing.

Correct! Wrong!

Excessive valve lash will NOT cause which of the following?

advanced valve timing

retarded valve timing

reduced engine power

poor fuel economy

Correct! Wrong!

Which of the following would not be a cause for a cylinder head to warp?

overheating

rapid cooling

over torquing

low coolant level

Correct! Wrong!

If excessive carbon builds up in the combustion chamber, it may:

flake off in pieces large enough to damage the turbocharger

plug the injector spray nozzles

reduce the clearance between the piston and liner and score the liner

all of the above

Correct! Wrong!

What would be the most likely cause of a piston contacting the cylinder head?

faulty valve guide

bent crankshaft

bent connecting rod

connecting rod bearing failure

Correct! Wrong!

A technician finds that engine oil is coming from the overflow pipe of the vehicles radiator. The most likely cause of this is:

piston cooler nozzle is plugged

water pump seal is leaking

oil pump seal is leaking

oil cooler is faulty

Correct! Wrong!

When an engine oil analysis indicates a high level of silica the _____________ should be checked.

oil cooler

air intake system

oil viscosity

oil filter

Correct! Wrong!

Too high of an oil level in an engine may cause the connecting rods to chum the oil, aerating it and increasing engine temperature and oil consumption.

True

False

Correct! Wrong!

An oil cooler should be changed after a major engine failure as there is no reliable way of cleaning it.

True

False

Correct! Wrong!

Technician A says that an air cleaner restriction indicator will trip (show red in the window) whenever an engine is lugged. Technician B says that a badly restricted air cleaner element will cause an engine to smoke excessively. Who is correct?

Technician A

Technician B

Both A and B

Neither A nor B.

Correct! Wrong!

A technician says that testing the engines coolant and correcting the amount of additive will prolong the life of the cooling system. The proper way to test the coolant is to:

look, feel and smell the coolant

use a cooling system pressure tester

test a sample of coolant

use a refractometer

Correct! Wrong!

As vehicle engine temperature rises, the radiator shutters should open:

before the thermostat opens

after the engine fan kicks in

after the thermostat opens

at the same time as the thermostat opens

Correct! Wrong!

An operator complains that when he turns on his Jake brake there is no reaction. The most likely first step for the diagnosis of the problem would be:

determining if there is too little oil pressure

determining if there is too little air pressure

determining if electrical current is energizing the solenoid valves

determining if the Jake control valves are faulty

Correct! Wrong!

The purpose of removing air box covers on a Detroit Diesel engine is to:

inspect for blowby and excessive carbon buildup

inspect for connecting rod damage or wrist pin end play

inspect the condition of the liners, pistons and rings

inspect the engine for excessive oil consumption

Correct! Wrong!

After replacing an injector line, what will the technician have to do first before starting the engine?

readjust the low idle

bleed all air out of the line

readjust the high idle

replace the transfer pump

Correct! Wrong!

The figure below shows what type of fan hub?

air applied fan hub

electricity activated fan hub

vicous-clutch fan hub

hydraulic applied fan hub

Show hint

Correct! Wrong!

Technician A says that glow plugs are used to help start the engine in cold weather. Technician B says that glow plugs should be disconnected in warm weather. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

All of the following can be used to bleed air out of the fuel system EXCEPT:

by cranking the engine and bleeding the injector lines

by pressurizing the fuel system with the primer pump and bleeding the injector lines

by replacing the fuel filter

by pressuring the fuel tank with a low volume air line and bleeding the injector lines

Correct! Wrong!

Premature engine bearing failures may be caused by:

fast cold starts

coolant in oil

poor work habits

all of the above

Correct! Wrong!

The LEAST likely cause of oil pump failure is:

oil pump gear lockup

oil pump drive rod failure

excessive engine speed

a defective oil pressure relief valve

Correct! Wrong!

Technician A says some oil leaks are caused by gasket material being blown out of its sealing position. Technician B says that some oil leaks can be found by adding a dye to the engine oil that is visible under ultraviolet light. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

Which of the following can cause a noise that can sound like valve train noise or a deep engine knock?

cracked holes or loose bolts on a flex plate

a loose crankshaft dampener centre bolt

a loose serpentine drive belt tensioner

low lubrication oil pressure

Correct! Wrong!

Which of the following exhaust conditions are the most likely indicator of an engine misfire?

blue colored smoke from the tailpipe.

excessive rattling of the exhaust system

cold exhaust temperature

puffing white smoke or wheezing

Correct! Wrong!

Technician A says that most manufacturers provide technical service information on compact discs (CD). Technician B says that if available, service manuals from the vehicle''s manufacturer have detailed information regarding procedures and diagnostic information. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

A customer has brought in a unit that has an engine oil leak. Upon inspection, the lower half of the engine is covered in oil. What is done next?

the engine must be properly cleaned before an accurate diagnosis can be given

it is most likely the oil pan gasket if the lower portion of the engine is leaking

it is most likely the front seal leaking and the wind from the fan is blowing it back

ask the customer what he thinks the problem is and start with that

Correct! Wrong!

What can be determined by the colour of an engine oil?

the age of the engine

if the engine oil needs to be changed

how many miles it has been since the last oil change

nothing

Correct! Wrong!

An engine has a deep engine knock when it is first started up, and becomes less noticeable as it warms, until the noise almost fades away at operating temperatures. What could be the cause?

bent valve push-rods

one or more collapsed mechanical lifters

lack of oil pressure to the valve train

worn main bearings

Correct! Wrong!

Blue smoke that is coming out of the exhaust can be caused by all of the following EXCEPT:

worn valve guides

worn valve seals

leaking oil cooler

worn piston rings

Correct! Wrong!

What might be the problem with a diesel engine that seems to have an increase in power and excessive black smoke?

plugged air cleaner

plugged fuel filters

faulty turbo charger

restricted fuel return line

Correct! Wrong!

The likely cause of a broken crankshaft near the front of an engine could be:

Incorrect engine and transmission alignment

damaged or inoperative harmonic balancer

worn main bearings

front connecting rod bearing wear

Correct! Wrong!

Glycol based anti freeze in the oil will:

evaporate from the oil at operating temperature

be filtered out by the oil filter

act as a lubricant

form varnish under heat and damage the engine

Correct! Wrong!

Excessive black smoke under load could be caused by:

excessive boost pressure.

leaking head gasket

restricted fuel supply

engine overfueling

Correct! Wrong!

If a harmonic balancer outer ring has slipped on the rubber mounting, what must be done to correct it?

twist the ring back to its original position

secure the outer ring by wedding it in place

replace the harmonic balancer

press on a new outer ring

Correct! Wrong!

A vehicle that is experiencing poor fuel economy has entered the shop. Technician A says that if there is no fuel leaking from the fuel pump, then there is no problem with the pump. Technician B says that the fuel pump could be leaking internally and the engine oil level should be checked to help indicate a problem. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

What would cause oil to appear in the turbo crossover to the intake manifold?

worn piston rings

excessive oil pressure

restricted exhaust pipe

faulty turbo seals

Correct! Wrong!

To check for suspected coolant leakage at the liners (coolant in oil):

the piston must be removed to check for cracked liners or corrosion pin holes

remove the heads and check for correct sleeve protrusion

remove the oil pan and pressure check the cooling system

remove the liners and check for cut-o-rings

Correct! Wrong!

Excessive pin and guide hole wear on valve bridges would be an indication that the:

the crosshead has not been matched to the pin

material in the crosshead is inferior

crosshead has been incorrectly adjusted

engine has been overheated

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!

A leaking seal or gasket on a pre-combustion chamber may cause:

Incorrectly adjusted engine valves may cause:

Which of the following is NOT a cause of low engine power?

Which of the following could cause an engine to misfire?

Excessive valve lash will NOT cause which of the following?

Excessive piston to cylinder liner clearance can cause:

Which of the following could cause early valve opening?

To help diagnose and determine the cause of a deep engine knock, you should first:

Inadequate coolant treatment may cause:

One of the first things to check when an engine is reported to have excessive vibration is the:

A technician finds that a viscous type vibration damper has a dent in it, the proper procedure would be to:

Valve and seat wear would:

Excessive valve lash will NOT cause which of the following?

Which of the following would not be a cause for a cylinder head to warp?

If excessive carbon builds up in the combustion chamber, it may:

What would be the most likely cause of a piston contacting the cylinder head?

A technician finds that engine oil is coming from the overflow pipe of the vehicles radiator. The most likely cause of this is:

When an engine oil analysis indicates a high level of silica the _____________ should be checked.

Too high of an oil level in an engine may cause the connecting rods to chum the oil, aerating it and increasing engine temperature and oil consumption.

An oil cooler should be changed after a major engine failure as there is no reliable way of cleaning it.

Technician A says that an air cleaner restriction indicator will trip (show red in the window) whenever an engine is lugged. Technician B says that a badly restricted air cleaner element will cause an engine to smoke excessively. Who is correct?

A technician says that testing the engines coolant and correcting the amount of additive will prolong the life of the cooling system. The proper way to test the coolant is to:

As vehicle engine temperature rises, the radiator shutters should open:

An operator complains that when he turns on his Jake brake there is no reaction. The most likely first step for the diagnosis of the problem would be:

The purpose of removing air box covers on a Detroit Diesel engine is to:

After replacing an injector line, what will the technician have to do first before starting the engine?

The figure below shows what type of fan hub?

Technician A says that glow plugs are used to help start the engine in cold weather. Technician B says that glow plugs should be disconnected in warm weather. Who is right?

All of the following can be used to bleed air out of the fuel system EXCEPT:

Premature engine bearing failures may be caused by:

The LEAST likely cause of oil pump failure is:

Technician A says some oil leaks are caused by gasket material being blown out of its sealing position. Technician B says that some oil leaks can be found by adding a dye to the engine oil that is visible under ultraviolet light. Who is right?

Which of the following can cause a noise that can sound like valve train noise or a deep engine knock?

Which of the following exhaust conditions are the most likely indicator of an engine misfire?

Technician A says that most manufacturers provide technical service information on compact discs (CD). Technician B says that if available, service manuals from the vehicle''s manufacturer have detailed information regarding procedures and diagnostic information. Who is right?

A customer has brought in a unit that has an engine oil leak. Upon inspection, the lower half of the engine is covered in oil. What is done next?

What can be determined by the colour of an engine oil?

An engine has a deep engine knock when it is first started up, and becomes less noticeable as it warms, until the noise almost fades away at operating temperatures. What could be the cause?

Blue smoke that is coming out of the exhaust can be caused by all of the following EXCEPT:

What might be the problem with a diesel engine that seems to have an increase in power and excessive black smoke?

The likely cause of a broken crankshaft near the front of an engine could be:

Glycol based anti freeze in the oil will:

Excessive black smoke under load could be caused by:

If a harmonic balancer outer ring has slipped on the rubber mounting, what must be done to correct it?

What would cause oil to appear in the turbo crossover to the intake manifold?

To check for suspected coolant leakage at the liners (coolant in oil):

Excessive pin and guide hole wear on valve bridges would be an indication that the:

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

Success!

Heavy-Duty Mechanic - Trucks & Equipment