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Exam 13: Pistons, Rings, Connecting Rods, and Bearings

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Question 21

Multiple Choice

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Technician A says that if the original lifters are being installed, they must be put back in their original position. Technician B says that the lifter bore clearance should be checked with Plastigage prior to installation. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

E) A) and B)
F) All of the above

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Question 22

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Cam ground pistons have the largest diameter across the trust surfaces.

A) True
B) False

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Question 23

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Connecting rod bearings receive oil after it passes through the crankshaft through small passages that are fed through the main bearings.

List in inches three main bearing undersizes usually available for most engines with undersized ground crankshafts.

Full-floating piston pins are held in by locks or snap rings that usually allow the pin to be removed without a press.

Higher compression ratios can be attained from dished pistons instead of domed.

Cast aluminum pistons expand more and at a faster rate than forged aluminum pistons.

How many thrust bearings will you find on a crankshaft?

Technician A says that it may be possible to file piston rings that have the end gaps too tight. Technician B says that a ring compressor is used to aid in installing the piston rings onto the pistons. Who is correct?

What is the skirt of the piston and its function?

Technician A says to apply oil to the connecting rod bearings while taking measurements with Plastigage. Technician B says that Plastigage will more accurately measure oil clearances than micrometers. Who is correct?

Describe how a rod heater works and is used to install a piston and pin on a connecting rod.

What three things related to the camshaft will affect the depth needed for piston valve reliefs?

Technician A says that RTV sealer may be used in place of an O-ring installed on an oil pump pickup. Technician B says that oil pumps should be installed onto the engine block with all parts inside and out, clean and dry. Who is correct?

Technician A says most engines use two oil control rings and one compression ring. Technician B says low-tension oil rings reduce friction and improve fuel economy. Who is correct?

Technician A says if the piston ring end gap is too tight, ring breakage could occur. Technician B says that piston rings come in increments of .001" (.0254mm) . Who is correct?

Explain what the minor and major thrust sides of the piston are.

The thrust bearing prevents excessive side-to-side movement of the crankshaft.

What tool is used for installing the piston rings on the pistons?

Which of the following is a typical main bearing torque sequence?