Exam 4: Cylinder Blocks and Crankshafts

Technician A says that if the marks are not aligned on the two rings of an elastomeric dampener, it is defective. Technician B says that the lines on the outer and inner hub of an elastomeric dampener should always line up. Who is right?

What type of tapped threads is most commonly used in cylinder block castings?

Which of the following is NOT a function of engine bearings?

V8 engines have cylinder banks arranged at which of the following angles to allow for even crankshaft rotation between firing impulses?

Which of the following features will a ladder-frame engine block have?

To reduce the time and distance required for engine break in, manufacturers use a process called:

Which of the following can substantially suppress torsional vibration at its end of the crankshaft?

Technician A says that cast-in-place iron liners are commonly used in aluminum cylinder blocks. Technician B says that only closed-deck blocks will use cast iron liners. Who is correct?

Which of the following supports cylinders and liners (if equipped) as its primary function?

Two technicians are describing the reasons for the greatest amount of wear near the top of the cylinder wall, causing taper. Technician A says that higher cylinder pressures near the top part of piston travel increase ring pressure against the cylinder walls. Technician B says a lack of upper cylinder wall lubricant takes place because lubrication oil can only be carried into this area on the face of the compression ring. Who is right?

What portion of the upper cylinder walls is induction hardened by the GM Duramax 6.6 blocks?

After discovering coolant is leaking into the engine oil, Technician A says the leak will rapidly accelerate cylinder wall wear. Technician B says the coolant leak is likely casue more damage to engine bearings first. Who is correct?

Technician A says that undersized bearings are available to service diesel engine forged crankshafts. Technician B says that diesel crankshafts are almost always hardened; and grinding to repair journal damage will remove the surface hardening. Who is right?

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?

The distance of rod journal offset from the main bearing journals is known as the throw and determines the :

When the engine is operating, tremendous inertia forces are generated by the reciprocating mass of the connecting rod and piston assembly. To balance these forces, large counterweights are formed on the crankshaft at _____ degrees opposite the rod journal.

As part of the dual-mass flywheel inspection, the secondary plate rock checks the:

Technician A says that cylinder sleeves must be replaced in pairs if they become worn or damaged prematurely. Technician B says that sleeves are commonly used in medium and large bore engines operating under high mileage extended service conditions. Who is right?

Technician A says that nitriding bearing journal surfaces produces the deepest amount of crankshaft hardening. Technician B says that induction hardening produces the hardest journal finish. Who is correct?

What type of bearings use a construction technique that hardens the bearings overlay surface to increase their durability?