TheoryFree ASE T2 Diesel Engine Prep Practice Test PDF
Download a free ASE T2 Diesel Engine Prep practice test PDF with 30 questions, answers and explanations, then continue with online mock exams.
Free ASE T2 Diesel Engine Prep PDF with 30 questions
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The PDF includes 30 ASE T2 Diesel Engine Prep questions with answers and explanations.
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Q1A diesel engine is experiencing a loss of power. During inspection, the technician discovers valve recession on multiple valves. What is the most likely cause?
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✓ Correct answer: Incorrect valve lash adjustment
Valve recession occurs when valve seats wear excessively, allowing valves to recede deeper into the cylinder head. This is typically caused by lack of lubrication or incorrect valve lash adjustment that prevents proper rotation of the valves during operation.
Q2When measuring a cylinder head for flatness with a straightedge and feeler gauge, what is the maximum allowable warpage on most medium/heavy duty diesel engines?
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✓ Correct answer: 0.003 inch (0.076 mm)
Most medium/heavy duty diesel engine manufacturers specify a maximum cylinder head warpage of 0.003 inch (0.076 mm) across the length of the head. Exceeding this specification requires either machining or replacement of the head.
Q3When inspecting valve guides for wear, a technician uses a dial indicator to measure valve stem-to-guide clearance. If the measured clearance is 0.005 inch (0.127 mm), what should the technician do?
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✓ Correct answer: Replace or recondition the valve guides
Excessive valve stem-to-guide clearance (typically over 0.003-0.004 inch depending on the engine) indicates worn valve guides that need replacement or reconditioning. This excessive clearance can cause oil consumption, valve stem breakage, and poor engine performance.
Q4A technician is performing a valve seat runout test using a dial indicator. What is the maximum acceptable runout on most medium/heavy duty diesel engines?
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✓ Correct answer: 0.002 inch (0.051 mm)
Maximum acceptable valve seat runout on most medium/heavy duty diesel engines is typically 0.002 inch (0.051 mm). Excessive runout prevents proper valve sealing, leading to compression loss and possible valve burning.
Q5While disassembling a cylinder head, a technician notices several rocker arms have excessive wear at the valve contact point. What is the most likely cause?
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✓ Correct answer: Insufficient lubrication
Insufficient lubrication is typically the cause of excessive wear at rocker arm valve contact points. This can be due to clogged oil passages, low oil pressure, or extended oil change intervals that degraded the oil's lubricating properties.
Q6During cylinder head reassembly, what is the correct sequence for tightening cylinder head bolts?
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✓ Correct answer: Start at the center and work outward in a spiral pattern
Cylinder head bolts must be tightened in a spiral pattern from the center outward to ensure even clamping force and prevent warping of the cylinder head or improper gasket seating.
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