Exam 4: Cylinder Blocks and Crankshafts

Technician A says that a defective vibration dampener will cause the accessory drive belts of an engine to jump off the drive pulleys. Technician B says a defective vibration dampener will cause the crankshaft or even the camshaft to break. Who is correct?

Which of the following is the primary reason for locating geartrains on the rear of the engine?

Which of the following is the purpose of bolster bolts or tie bolts?

Technician A says that rear geartrains are used to shorten the length of the engine block. Technician B says that rear geartrains reduce engine vibration. Who is correct?

Two technicians are discussing the use of aluminum in diesel engine blocks. Technician A says that aluminum has an expansion coefficient ten times the rate of iron. Technician B says that aluminum also has challenges in diesel application in terms of rigidity, strength, and reliable bolting of the cylinder head and main bearings. Who is right?

The lightest, strongest, and quietest engine blocks are _________.

What is measured after the clutch cover is reinstalled during the inspection of a dual mass flywheel?

While installing new rod bearing inserts, the shells protruded very slightly above the margin of the bearing cap. Technician A says this is normal. Technician B says that wrong bearings produce this result. Who is correct? ​

Torsional vibration resulting in "jumped" accessory drive belts, excessive geartrain wear, and broken camshafts is commonly the result of which of the following defective components?

Technician A says that Plastigauge that becomes wider indicates a smaller oil clearance between a crankshaft and main bearing. Technician B says the Plastigauge will become narrower when bearing oil clearances are smaller. Who is correct?

What cylinder construction, also known as a no-sleeve block, has holes cast and bored in the block for the cylinders?

The presence of cavitation on a replaceable cylinder liner is most likely caused by ___________.

Cylinder wear at mid-stroke is a common condition in engines with:

Which of the following is NOT part of a cylinder kit?

What is the technique called that ties the cylinder head to the block with steel tie bolts inserted through the bottom of the block?

Two technicians explain how to increase block rigidity. Technician A says that vibration reduction and increased block rigidity can be further enhanced by adding lines to the deep skirt crankcase walls. Technician B says that adding ribs and webbing to the crankcase area minimizes crankcase distortion causing noise vibration. Who is right?

While examining a thick, heavy, flat steel plate bolted to the oil pan rails and main bearing caps, Technician A suggests it is used to stiffen the crankcase to reduce torsional twisting. Technician B says the plate is used to prevent oil from splashing up onto the cylinder walls and causing high oil consumption. Who is correct?

Which of the following does NOT have a diesel engine block cylinder banks configuration?

Which of these is the ability of a bearing to allow friction without excessive wear or friction?

Technician A says that polished cylinder walls will cause low power and more blowby. Technician B says cylinder walls with more than 90% remaining crosshatch have less than 50% remaining service life. Who is correct?