Cummins Diesel Engine School Practice Test

These questions are part of the practice quiz. Start practicing

• What is the maximum fuel dilution for lube oil?
• Which safety precautions are essential when performing engine maintenance?
• What is the function of the crankshaft thrust bearing?
• Which measurement is the stroke length?
• Which components are evaluated by a compression test in a diesel engine?
• Which of the following statements is true about the J/W pump drive?
• Which statement about DPF regeneration is true?
• Does the Cummins B-Series engine use replaceable cylinder liners?
• What is the max freshwater temp?
• On the 6BTA5.9M2, where is the engine data plate located?
• Which of the following is NOT a responsibility of the neutral safety switch?
• Which sequence correctly lists the four strokes of a four-stroke engine?
• The engine model 6BTA5.9M has how many main bearings?
• Which condition must be true for the engine to start in a typical vehicle with an automatic transmission?
• In the model code 6BTA5.9M2, what does the trailing '2' represent?
• What is the direction of rotation when viewed from the front?
• What is the purpose of the EGR valve in diesel engines?
• What is the function of the main bearing shells?
• Where is the gear train located on the engine?
• If the neutral safety switch fails, what is a possible safety risk?
• Which bearing limits axial thrust?
• Which component traps soot in the exhaust and requires regeneration?
• Which starting condition is typical for automatic transmissions?
• Which sensor is commonly used to monitor fuel pressure in the fuel system of modern Cummins diesel engines?
• In the designation 6BTA5.9M2, which letter indicates marine use?
• If a leak-down test indicates a leak, what does it help identify?
• What does cranking speed affect during starting?
• Which range is within the normal lubrication oil pressure at rated speed?
• Which of the following best describes the combined function of EGR, DPF, and SCR in Cummins engines?
• Dirty diesel fuel can cause which of the following issues?
• What type of vibration dampener is used on high horsepower engines?
• Staggering piston rings primarily helps to maintain what?
• Which of the following is NOT commonly used to control engine timing and fueling in modern Cummins diesel engines?
• In the QSB designation, what does the 'S' stand for?
• Which engine has an idle speed of 600 rpm?
• What outcome is associated with proper coolant maintenance?
• What electrical component charges the start batteries?
• The max lube oil temp is ___ degrees.
• Explain the function of a turbocharger wastegate.
• In the designation 6BTA5.9M2, what does the letter 'M' indicate?
• Why is bleeding the cooling system important after maintenance?
• Which test would you perform to diagnose charging system problems?
• What is the purpose of a fuel pressure test on a diesel engine?
• What is the idle speed for the QSB engine?
• Is the 6BTA5.9M a 4 stroke or 2 stroke engine?
• What is the idle speed of the BTA5.9M2?
• Which engine has a compression ratio of 15.5:1?
• Which of the following is a step in a basic no-start diagnostic for a diesel engine?
• Piston cooling nozzle lubricates the piston pin?
• The B-Series engine uses replaceable cylinder liners?
• Which metal completes the trio in main bearing shells composition?
• What is the impact of incorrect diesel fuel cetane rating on starting and combustion?
• Which gears are part of the gear train on the 6BTA5.9M2?
• Which component prevents starting the engine when the transmission is not in neutral or park?
• Which engine has a compression ratio of 17.2:1?
• The expansion tank cap is rated at what psi?
• How many camshaft bores are there?
• How does a fuel injector function in a Cummins engine?
• In the QSB designation, what does the 'B' stand for?
• Which statement best describes the crankshaft's primary function?
• Which scenario describes the normal function of the neutral safety switch?
• What drives the S/W pump for the B-series?
• What is the primary purpose of EGR in diesel engines?
• Cooling system maintenance helps prevent corrosion in which components?
• Where is the camshaft thrust plate located?
• Which statement best describes the role of exhaust gas recirculation (EGR) in a diesel engine?
• What is the function of fuel filters in a diesel fuel system?
• Which statement best describes the purpose of coolant mixture maintenance?
• Why is it important to maintain fuel tanks at 95% of fuel capacity?
• The gear train on the 6BTA5.9M2 includes which gears?
• Regular coolant maintenance prolongs component life by:
• What is the purpose of the glow plug relay and circuit protection in a diesel engine?
• What is the intake valve seat angle?
• During a cylinder compression test, why is throttle opened and ignition sources removed?
• What would be a typical symptom of a faulty neutral safety switch?
• Which option correctly matches the meanings of Q, S, and B in QSB?
• What is the compression ratio for the QSB engine?
• Which component relies on coolant properties to avoid damage due to temperature extremes?
• What are typical indications of a fuel starvation condition in a diesel engine?
• Which statement about coolant additives and corrosion is most accurate?
• Main bearing shells primarily assist in aligning and supporting which engine component?
• What is the timing pin used to find?
• Which component is designed to prevent starting when the vehicle is not in Park or Neutral?
• What is the stroke length?
• Which statement about coolant additives is correct?
• Regular coolant maintenance primarily ensures which outcome?
• What is the normal freshwater temperature of the B-series?
• What is the firing order on a Cummins 6BTA5.9M2?
• What is the compression ratio for the BT5.9M engine?
• Which statement best describes crankcase pressure and how it is managed in most diesel engines?
• How are the turbocharger bearings lubricated on the 6BTA5.9M2?
• Which aspect of coolant maintenance directly affects the water pump and cooling passages?
• Which component converts piston motion into rotational motion?
• What is the normal L/O pressure at rated speed of the B-series?
• Using an improper coolant mix can lead to:
• Where is the timing pin hole located?
• Where is the timing pin hole located?
• What does the '5.9' stand for in 6BTA5.9M2?
• What is the compression ratio for the 6BTA5.9 engine?
• Which statement best describes the impact of clean fuel on injectors?
• Which component injects urea to convert NOx to nitrogen and water in Cummins engines?
• What is the primary role of a turbocharger in a modern diesel engine?
• Which statement describes the functions of the fuel injection pump?
• How many connecting rod journals are in the crankshaft?
• What is the bore circumference?
• The neutral safety switch is part of which general system?
• What does the '6' stand for in 6BTA5.9M2?
• What is the primary effect of incorrect timing on diesel engine performance?
• What is the purpose of an intercooler in a turbocharged diesel engine?
• What is the minimum lube oil pressure at idle?
• When starting the engine, how long can the starter remain engaged before it is at risk of being damaged?
• How many main bearings on 6BTA5.9M?
• Glow plug check for cold no-start conditions typically involves inspecting which component?
• What is a bore scope and how is it used in engine inspection?
• Why does diesel fuel require injection rather than spark ignition?
• When installing connecting rods or main bearing caps, how are they oriented within the cylinder block?
• What is the function of a thermostat in the cooling system?
• What is the compression ratio for the 6B5.9M engine?
• What is the function of glow plugs in a diesel engine and when are they used?
• What is the basic difference between a diesel cycle and a spark-ignition Otto cycle?
• What does the 'T' stand for in 6BTA5.9M2?
• Identify common signs of turbocharger or intercooler failure on a diesel engine.
• In manual transmissions, which component often serves a similar safety function by preventing starting unless the clutch is engaged?
• What is the purpose of crankcase ventilation in a diesel engine?
• What is the purpose of an engine coolant temperature sensor?
• Why is water pump failure critical in engine cooling?
• Which starting condition is allowed by the neutral safety switch?
• Which component supplies timed pulses to each injector in an inline pump?
• What is unique about the top piston ring on the 6BTA5.9M?
• What is needed to modify the Engine Data Plate?
• How is the J/W pump driven?
• Why is proper torquing of cylinder head bolts important in a diesel engine?
• If cylinder head bolts are not torqued uniformly, what issue is most likely?
• Which component damp torsional vibrations in the crankshaft?
• Which engine has a compression ratio of 16.5:1?
• What is the maximum fuel dilution for lube oil?
• What does a compression test assess in a diesel engine?
• What is the purpose of a NOx sensor in a diesel aftertreatment system?
• What does the 'B' stand for in 6BTA5.9M2?
• When installing the oil control rings, how is the expander positioned?
• Maintaining proper coolant levels primarily helps to:
• A clogged air filter in a diesel engine is a common cause of which issue?
• How many valves are in the head of the 6BTA5.9M2?
• The gear train is located in which general area of the engine?
• What does the 'A' stand for in 6BTA5.9M2?
• In the QSB designation, what does the 'Q' stand for?
• Which component houses the cylinders and supports the rotating assembly in a Cummins diesel engine?
• Which functions of the fuel injection system are accomplished by the fuel injection pump?
• What is the purpose of having a 2 degree slope in the exhaust manifold?
• Which component retains the piston pin in the piston?
• Which maintenance actions help prevent injector failure in diesel engines?
• The coolant additives help lubricate which component?
• What is the purpose of staggering piston rings?
• What is the purpose of the cooling system in a diesel engine?
• What is the intake valve seat angle?
• Which factor primarily controls nozzle atomization in a diesel fuel injector?
• In the code 6BTA5.9M2, what is the meaning of the numeric value 5.9?
• How many webs per connecting rod journal?
• Which of the following is NOT a typical result of water pump failure?
• What is the purpose of the vibration dampener?
• How many main journals are in the crankshaft?
• Which statement about coolant's role in freezing and boiling is correct?
• What type of vibration damper is used on the 6BTA5.9M?
• During maintenance, why is it important to follow manufacturer procedures?
• The firing order begins with which sequence on the 6BTA5.9M2?
• Which statement best describes how a diesel engine achieves superior fuel efficiency relative to gasoline engines?
• What happens if boost pressure is too high?
• Which of the following is not a function of the fuel injection pump?
• What is the piston made of?
• What is the exhaust valve seat angle?
• Which component routes crankcase blow-by gases back to the intake for combustion?
• What is the function of the camshaft in a diesel engine?
• Which statement best describes the diesel particulate filter (DPF) and its regeneration methods?
• If coolant maintenance is neglected, what is a likely result?
• Why is proper air filtration critical in diesel engines?
• What is the role of intercooling in a turbocharged diesel engine?
• What is the purpose of verifying fuel rail pressure during a no-start diagnostic?
• What is the typical role of a governor in a diesel engine with a fuel injection pump?
• Which part contains the valves and injectors in a Cummins diesel engine?
• The neutral safety switch normally allows starting when the transmission is in which positions?
• What are the common causes of high exhaust smoke in diesel engines?
• What is the purpose of the neutral safety switch?
• What type of vibration dampener is used on low horsepower engines?
• Which statement is true about the engine with 5.9 displacement?
• Where is the Engine Data Plate located on the QSB?
• During oil control ring installation, the expander orientation should be...
• Describe the purpose of an oil filter and a bypass valve in an oil filtration system.
• Define common rail and how it differs from a distributor-type injection pump.
• What three metals make up the main bearing shells?
• What is the role of pistons and connecting rods in a diesel engine?
• What is the purpose of a torque-to-yield head bolt and its importance?
• When will the low lube oil pressure alarm sound?
• Which of the following best describes the normal starting condition for an automatic vehicle?
• Where is the Engine Data Plate located on the 6BT and 6BTA?
• The idle speed of the BTA5.9M2 equals which option?
• If the neutral safety switch is stuck in the OFF position, what might you experience?
• Which statement about the camshaft thrust plate is true?
• How does a leak-down test help diagnose engine health?
• What is boost pressure and why does it matter?
• Camshaft thrust plate is located between which two components?
• Which component drives the S/W pump for the B-series?
• Describe the basic operation of the lubrication system in a diesel engine.
• What is the function of an oxygen sensor in diesel aftertreatment systems?
• Which statement best describes the effect of clean fuel on injector wear and deposits?
• Data plate location on some Cummins engines is on which component?
• What is the function of the crankshaft?
• What is the difference between a rotary distributor pump and an inline pump?
• What is the exhaust valve seat angle?
• How do you perform a cylinder compression test and interpret results?