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Heavy Duty Diesel (Michigan SOS Test Study) 1 Questions with Answers (100% Correct Answers)

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Heavy Duty Diesel (Michigan SOS Test Study) 1 Questions with Answers (100% Correct Answers) A diesel engine has excessive oil consumption with no visible leaks. What could possibly be the cause? —Answer: Leaking turbocharger impeller shaft seal A diesel engine has excessive vibration. Tech A says that a binding (VGT) turbo vanes could be the cause. Tech B says that a broken flywheel/flexplate could be the cause. Who is correct? — Answer: Tech B Tech A says that debris in the cylinder head bolt holes can affect head bolt clamping force. Tech B says that using over-stretched cylinder head bolts can affect head bolt clamping force? Who is correct? —Answer: Both Cylinder liner protrusion (Height) that is too low can be adjusted by: —Answer: Adding cylinder liner shims While servicing an engine, the technician finds a slight amount of scoring on the engine side of the flywheel. Tech A says that excessive crankshaft endplay could be the cause. Tech B says that missing bell housing locating pins could be the cause. Who is right? —Answer: Tech A A diesel engine is being diagnosed for overheating. Once is reaches operating temperature, coolant leaks out of the overflow. What could be the cause? —Answer: Leaking head gasket A diesel engine is being diagnosed for coolant consumption. There are no external leaks and the engine oil does not show coolant contamination. What could be the cause? —Answer: Failed EGR cooler A diesel engine equipped with a Exhaust aftertreatment system is emitting black smoke from the exhaust. What could possibly be the cause? —Answer: An internally failed (DPF) Diesel Particulate Filter

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Heavy Duty Diesel (Michigan SOS Test Study) 2 (35 questions)
Questions with Answers (100% Correct Answers)
On a typical diesel subsystem, what system would most likely be used at the lowest pressure
when the engine is running? —Answer: Primary filter


Where is the secondary fuel filter usually located? —Answer: on the side of the transfer pump


Besides fue4l storage, the fuel tank may play an important role in a high-flow fuel system as a:
—Answer: Heat exchanger


What could be used to test the low-pressure side of a typical diesel fuel subsystem for inlet
restriction? —Answer: Negative pressure gauge


Which of the following should fuel subsystem charging pressures be measured with?


a.) Diagnostic sight glass


b.) H20 manometer


c.) HG manometer


d.) Accurate pressure gauge —Answer: D


What type of fuel transfer pump is more commonly used by electronically managed engine/fuel
systems? —Answer: Gear pumps


What type of pumping principle is used by a typical hand primer pump? —Answer: Single
acting plunger


Charging pressure rise is usually directly related to what? —Answer: Increased RPM


What is the purpose of the air inlet system? —Answer: To provide clean air to engine and
optimize air flow



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