310T Heavy Equipment Technician Practice Exam #2 –
Mechanical Systems, Maintenance & Troubleshooting
EXAM LATEST 140 QUESTIONS AND 100% Verified
ANSWERS JUST RELEASED
When is crankshaft noise more noticeable?!
When the engine is cold
When the engine is at low idle
When the engine is hot
The noise should not change with temperature or rpm - answer>>When the engine is hot
During a cylinder leakage test, what would be the cause of air escaping from the oil fill port?!
Worn or weak piston rings
A burnt or poor sealing exhaust valve
A burnt or poor sealing intake valve
Cylinder liner cavitation - answer>>Worn or weak piston rings
Which one of the following cylinder head components, when worn, would allow oil to enter the
exhaust gases or intake charge?!
The valve margin
The valve face
The valve seat
The valve guide - answer>>The valve guide
What is the preferred method of running-in a rebuilt engine?!
Perform a dynamometer test run
Road test with service brakes applied
Test driving the truck with an empty trailer
,Test driving the truck with a loaded trailer - answer>>Perform a dynamometer test run
What is the maximum inlet restriction permitted on a diesel engine air filter?!
5" H2O
10" H2O
25" H2O
50" H2O - answer>>25" H2O
Which of the following could occur if there was insufficient liner protrusion?!
Insufficient sealing
Liner flange damage would occur
Over-cooling of the cylinder head
The engine would overheat - answer>>Insufficient sealing
Which of the following could result from a worn cylinder counter-bore?!
Excessive sleeve protrusion
Upper sleeve flange separation
Sleeve cavitation
Piston damage during installation - answer>>Upper sleeve flange separation
After performing cylinder work such as boring or honing, what should be used to clean the cylinder
walls?!
Fresh engine oil
A soap and water solution
Solvent
Gasoline - answer>>A soap and water solution
,When rebuilding an engine with a camshaft located in the cylinder block, what would result from a
failure to replace worn camshaft bearings?!
Noisy valve operation
Noise during high engine loads only
Lower oil pressure readings
Premature camshaft gear - answer>>Lower oil pressure readings
What should be done before initial start-up of a rebuilt engine?!
Perform a compression test
Perform a cylinder leakage test
Release the parking brakes
Prime the lubrication system - answer>>Prime the lubrication system
When testing a gasoline engine, what would cause a vacuum gage to produce an intermittent
reading?!
A burnt valve
Worn piston rings
A loose or leaking intake manifold gasket
Worn valve guides - answer>>A burnt valve
When performing a dry compression test on a gasoline, what would cause low compression readings to
significantly rise during a wet compression test?!
Burnt valves
Worn piston rings
Defective head gasket
Worn valve guides - answer>>Worn piston rings
What tool is generally used to measure crankshaft bearing journals?!
, Vernier caliper
Outside micrometer
Straight edge and feeler gauge
"T" gauge and micrometer - answer>>Outside micrometer
After replacing a defective EUI (electronic unit injector) with a rebuilt/exchange unit, which of the
following procedures must be performed?!
Replace the engine ECM
Replace the personality module
Reprogram new calibration codes for all 6 EUIS
Reprogram a new calibration code for the replaced EUI - answer>>Reprogram a new calibration code
for the replaced EUI
When performing a 4-step injection actuation pressure test sequence on a typical HEUI
(hydraulic/electronic unit injector) system, which of the following components is being tested?!
Injector pressure regulator valve and high-pressure pump
HEUI injection pressure
Injector driver module
HEUI actuation cartridge - answer>>Injector pressure regulator valve and high-pressure pump
At the end of an injection cycle on an engine equipped with a TP (time/pressure) fuel system, which of
the following should be true?!
Nozzle spring closes fuelling plunger
TP tappet spring closes cup orifii
Moving components of the injector are loaded into the cup with mechanical crush
The cup orifii remain open and exposed to cylinder gas pressure - answer>>Moving components of the
injector are loaded into the cup with mechanical crush
Mechanical Systems, Maintenance & Troubleshooting
EXAM LATEST 140 QUESTIONS AND 100% Verified
ANSWERS JUST RELEASED
When is crankshaft noise more noticeable?!
When the engine is cold
When the engine is at low idle
When the engine is hot
The noise should not change with temperature or rpm - answer>>When the engine is hot
During a cylinder leakage test, what would be the cause of air escaping from the oil fill port?!
Worn or weak piston rings
A burnt or poor sealing exhaust valve
A burnt or poor sealing intake valve
Cylinder liner cavitation - answer>>Worn or weak piston rings
Which one of the following cylinder head components, when worn, would allow oil to enter the
exhaust gases or intake charge?!
The valve margin
The valve face
The valve seat
The valve guide - answer>>The valve guide
What is the preferred method of running-in a rebuilt engine?!
Perform a dynamometer test run
Road test with service brakes applied
Test driving the truck with an empty trailer
,Test driving the truck with a loaded trailer - answer>>Perform a dynamometer test run
What is the maximum inlet restriction permitted on a diesel engine air filter?!
5" H2O
10" H2O
25" H2O
50" H2O - answer>>25" H2O
Which of the following could occur if there was insufficient liner protrusion?!
Insufficient sealing
Liner flange damage would occur
Over-cooling of the cylinder head
The engine would overheat - answer>>Insufficient sealing
Which of the following could result from a worn cylinder counter-bore?!
Excessive sleeve protrusion
Upper sleeve flange separation
Sleeve cavitation
Piston damage during installation - answer>>Upper sleeve flange separation
After performing cylinder work such as boring or honing, what should be used to clean the cylinder
walls?!
Fresh engine oil
A soap and water solution
Solvent
Gasoline - answer>>A soap and water solution
,When rebuilding an engine with a camshaft located in the cylinder block, what would result from a
failure to replace worn camshaft bearings?!
Noisy valve operation
Noise during high engine loads only
Lower oil pressure readings
Premature camshaft gear - answer>>Lower oil pressure readings
What should be done before initial start-up of a rebuilt engine?!
Perform a compression test
Perform a cylinder leakage test
Release the parking brakes
Prime the lubrication system - answer>>Prime the lubrication system
When testing a gasoline engine, what would cause a vacuum gage to produce an intermittent
reading?!
A burnt valve
Worn piston rings
A loose or leaking intake manifold gasket
Worn valve guides - answer>>A burnt valve
When performing a dry compression test on a gasoline, what would cause low compression readings to
significantly rise during a wet compression test?!
Burnt valves
Worn piston rings
Defective head gasket
Worn valve guides - answer>>Worn piston rings
What tool is generally used to measure crankshaft bearing journals?!
, Vernier caliper
Outside micrometer
Straight edge and feeler gauge
"T" gauge and micrometer - answer>>Outside micrometer
After replacing a defective EUI (electronic unit injector) with a rebuilt/exchange unit, which of the
following procedures must be performed?!
Replace the engine ECM
Replace the personality module
Reprogram new calibration codes for all 6 EUIS
Reprogram a new calibration code for the replaced EUI - answer>>Reprogram a new calibration code
for the replaced EUI
When performing a 4-step injection actuation pressure test sequence on a typical HEUI
(hydraulic/electronic unit injector) system, which of the following components is being tested?!
Injector pressure regulator valve and high-pressure pump
HEUI injection pressure
Injector driver module
HEUI actuation cartridge - answer>>Injector pressure regulator valve and high-pressure pump
At the end of an injection cycle on an engine equipped with a TP (time/pressure) fuel system, which of
the following should be true?!
Nozzle spring closes fuelling plunger
TP tappet spring closes cup orifii
Moving components of the injector are loaded into the cup with mechanical crush
The cup orifii remain open and exposed to cylinder gas pressure - answer>>Moving components of the
injector are loaded into the cup with mechanical crush
