Exam 35: Crankshafts, Balance Shafts, and Bearings

Technician A says that many bearings also have a thin overlay of babbitt. Technician B says that bearings should have spread and crush to keep them from spinning when the crankshaft rotates. Who is right?

A forged crankshaft has a ________.

The crankshaft journals have been turned. What size bearings should be installed?

Crankshafts should be stored by which of these methods?

Bearing ________ occurs when a bearing shell is slightly above the parting surface of the bearing cap.

Why does a 4-cylinder engine have very little, if any, primary vibration?

A four-cylinder engine fires one cylinder at every ________ degrees of crankshaft rotation.

The thrust bearing surface is located on one of the main bearings to control thrust loads caused by ________.

Which of these is a primary cause of secondary vibration?

Technician A says that a vibration damper, also known as a harmonic balancer, is used to dampen harmful twisting vibrations of the crankshaft. Technician B says that most engines are balanced after manufacturing. Who is right?

A typical V-8 engine crankshaft has ________ main bearings.

Which one of these is a thrust bearing?

In ________ engines, the cam bearings are installed in the block.

If bearing-to-journal clearance is doubled, how much oil will flow?

Technician A says balance shafts are used to counteract vibration created in the engine. Technician B says proper balancing of the engine is important for smooth operation. Who is right?

Technician A says that most crankshafts can be reground to be 0.010, 0.020, or 0.030 inch undersize. Technician B says that most engine bearings are constructed with an aluminum shell for strength and are covered with a tin-lead alloy. Who is right?

Crankshaft journals are checked for which of these?

Technician A says that oil for the rod bearings comes from splash off the crankshaft. Technician B says that lubrication to the main bearings is fed through the main oil gallery in the block. Who is right?

A bearing shell has a sightly larger arc than the bearing housing. This difference is called ________.

Typical journal-to-bearing clearance is ________.