Chapters 9, 10 & 11
Which of the following engine oil grades would function best in sub-arctic temperature conditions?
0W-30
When a hone is used to glaze-bust a liner what is the recommended grit stone rating?
200 - 250
Which of the following values would be typical of engine oil at operating temperature?
230 degrees Fahrenheit
Which of the following SAE multigrade oils would likely be recommended by most highway diesel engine OEMs for year-round use in North America?
5W-30
When water freezes, how much does it expand in volume?
9 percent
Which of the following API classifications indicates that the oil is formulated for diesel engines meeting 2010 emissions standards?
CJ-4
Which type of diesel engine coolant is regarded as potentially the most harmful to humans?
EG
Which of the following is the recommended method of pulling dry liners from a cylinder block?
a puller & shoe assembly
What is a common indicator that engine oil has become contaminated with diesel fuel?
blacker in color
A diesel engine dash oil pressure gauge displays low and fluctuating oil pressure values when the vehicle is operated. Technician A states that this could be caused by low engine oil level. Technician B states that this could be caused by high engine oil level. Who is correct?
both A & B
Technician A says that loose fan belts are usually destroyed more rapidly than a belts that are adjusted too tight. Technician B says that too tight adjustment on poly-V fan belts can destroy bearings. Who is correct?
both A & B
Technician A states that an engine equipped with EGR and DPF must use API CJ- 4 engine oil. Technician B states that engines manufactured before 2007 may use API CI-4 engine oil. Who is correct?
both A & B
Technician A states that an oil cooler operates by having coolant pumped through the bundle tubes and oil circulated around the tubes. Technician B states that a leaking oil cooler core must always be replaced. Who is correct?
both A & B
Technician A states that the device used to signal oil pressure values to the ECM on most electronically managed engines uses a variable capacitance operating principle. Technician B states that an oil pressure sensor usually requires a V-Ref source from the engine ECM. Who is correct?
both A & B
What material is most commonly used in the manufacturing of diesel engine cylinder heads?
cast iron
When investigating a low oil pressure complaint, which of the following should be performed first?
check the crankcase oil level
What material is used in the manufacture of most commercial diesel engine cylinder blocks today?
compacted graphite iron (CGI)
The cooling system hoses on an engine collapse when the unit is left parked overnight. Which of the following is the likely cause?
defective radiator cap
Oil that has a milky, clouded appearance is probably contaminated with:
engine coolant
Which of the following conditions could result from a high crankcase oil level?
lube oil aeration friction bearing damage oil pressure gauge fluctuations
Technician A states that all cylinder heads on current engines should be hot torqued after a rebuild procedure. Technician B states that cylinder head bolts should be soaked in engine lubricating oil before installation. Who is correct?
neither A nor B
Once a cylinder head gasket fire ring has been torqued to its yield point, it should:
not be used after removal
What recently introduced technology enables the use of aluminum cylinder blocks in light and medium duty diesel engines?
plasma transfer wire arc (PTWA)
The temperature at which an engine oil begins to gel is known as:
pour point
When boiling out a cylinder block, why is it critical that all the scale in the water jacket be removed?
scale is an effective insulator
What should be done before removing a piston from a liner?
scrape away the carbon ridge
When cylinder block counterbores are machined, which of the following would be required?
shims
Technician A says that the first step to take when troubleshooting an engine overheating conditioning is to remove the radiator shroud to permit unimpeded air flow through the engine compartment. Technician B says that an engine overheat condition could be caused by a missing or damaged radiator shroud. Who is correct?
technician B
Technician A states that the operating temperature of an engine oil should be within 5°F of that of the engine coolant operating temperature. Technician B states that engine oil temperatures are probably a more accurate means of assessing actual engine operating temperature than the coolant temperature reading. Who is correct?
technician B
When a cylinder head bolt torque specification requires that the fastener is first torqued, then turned through a further set number of degrees, the method is known as:
template torque
How much is coolant boil point raised in a sealed cooling system for each one psi above atmospheric pressure?
three degrees farenheit
When hydrostatic pressure testing a cylinder head, which areas should be most closely examined for leaks?
valve seats and injector sleeves
