Podcast
Questions and Answers
Under normal operating conditions, approximately what maximum temperature can a piston head reach?
Under normal operating conditions, approximately what maximum temperature can a piston head reach?
- 450°F
- 700°F (correct)
- 650°F
- 500°F
What component of the piston assembly provides necessary clearance to prevent contact between the piston and crankshaft counterweights?
What component of the piston assembly provides necessary clearance to prevent contact between the piston and crankshaft counterweights?
- Compression rings
- Valve reliefs
- Piston taper
- Slipper skirt (correct)
What is the distance from the centerline of the piston pin hole to the top of the piston known as?
What is the distance from the centerline of the piston pin hole to the top of the piston known as?
- Compression distance (correct)
- Pin hole diameter
- Skirt length
- Piston diameter
Which piston design is most commonly paired with a wedge-type cylinder head in engine construction?
Which piston design is most commonly paired with a wedge-type cylinder head in engine construction?
What is the most common configuration for oil rings in an internal combustion engine?
What is the most common configuration for oil rings in an internal combustion engine?
What parameter is determined by the difference between the width of the piston ring and the width of the piston ring groove?
What parameter is determined by the difference between the width of the piston ring and the width of the piston ring groove?
What is the primary function of a connecting rod that has been drilled with a small passage?
What is the primary function of a connecting rod that has been drilled with a small passage?
In a V-type engine configuration, how many connecting rods typically attach to each crankshaft journal?
In a V-type engine configuration, how many connecting rods typically attach to each crankshaft journal?
Which of the following is NOT considered to be a basic type of engine bearing?
Which of the following is NOT considered to be a basic type of engine bearing?
Which of the following is not a basic part of an engine bottom end?
Which of the following is not a basic part of an engine bottom end?
What is the significance of using connecting rod numbers during engine assembly or maintenance?
What is the significance of using connecting rod numbers during engine assembly or maintenance?
Why are some engine parts, such as gears and shafts, often case hardened?
Why are some engine parts, such as gears and shafts, often case hardened?
Which of the following features is NOT typically associated with modern piston assemblies?
Which of the following features is NOT typically associated with modern piston assemblies?
What is the purpose of 'bearing crush' in engine bearing design?
What is the purpose of 'bearing crush' in engine bearing design?
What is meant by the term 'bearing spread' when referring to engine bearings?
What is meant by the term 'bearing spread' when referring to engine bearings?
What term describes an engine bearing that has the exact dimensions specified by the manufacturer for a new, unmachined crankshaft?
What term describes an engine bearing that has the exact dimensions specified by the manufacturer for a new, unmachined crankshaft?
What is the primary reason for using an 'undersized' engine bearing?
What is the primary reason for using an 'undersized' engine bearing?
Which of the following properties is NOT typically associated with engine bearings?
Which of the following properties is NOT typically associated with engine bearings?
Given normal operating conditions, when is it most appropriate to use piston rings featuring a soft coating?
Given normal operating conditions, when is it most appropriate to use piston rings featuring a soft coating?
What is characterized as piston slap?
What is characterized as piston slap?
Flashcards
Piston Head Temperature
Piston Head Temperature
Piston heads can reach operating temperatures as high as 650°F to 700°F.
Slipper Skirt Function
Slipper Skirt Function
Slipper skirt pistons provide clearance between the piston and crankshaft counterweights.
Compression Distance
Compression Distance
The distance from the piston pin hole centerline to the piston top is called compression distance.
Piston Type for Wedge Heads
Piston Type for Wedge Heads
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Oil Ring Composition
Oil Ring Composition
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Ring Side Clearance
Ring Side Clearance
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Drilled Connecting Rods
Drilled Connecting Rods
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Connecting Rods per Journal (V-Engine)
Connecting Rods per Journal (V-Engine)
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Engine Bearing Types
Engine Bearing Types
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Engine Bottom End
Engine Bottom End
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Ring Gap
Ring Gap
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Connecting Rod Numbers
Connecting Rod Numbers
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Bearing Conformability
Bearing Conformability
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Undersized Bearing
Undersized Bearing
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Bearing Crush
Bearing Crush
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Ring Side Clearance
Ring Side Clearance
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Study Notes
- A piston head can reach operating temperatures as high as 650°F.
- Slipper skirt provides clearance between the piston and crankshaft counterweights.
- Compression distance is the distance from the piston pin hole centerline to the piston top.
- Flat-top pistons are commonly used with a wedge-type cylinder head.
- The most common oil rings consist of two rails and a spacer.
- Ring side clearance is determined by the difference between piston ring width and ring groove width.
- A drilled connecting rod supplies oil to the piston pin.
- In a V-type engine, two connecting rods bolt to each crankshaft journal.
- Piston bearings are not basic types of engine bearings.
- The valve train is not a basic part of an engine bottom end.
- Determining the difference between the ring width and the width of the piston ring groove is necessary.
- The difference between the ring wall thickness and ring groove depth must be determined.
- Ring gap must be defined.
- Piston rings with soft coatings should be used in certain situations.
- Some parts are case hardened for specific reasons.
- Offset piston pin does not relate to modern piston assemblies.
- Piston slap and piston pin offset are important to understand.
- An indicator is used on the head of a piston to indicate piston pin offset.
- Connecting rod numbers are used for specific reasons.
- Engine crankshafts are usually made of specific materials.
- Lubricating oil gets to the connecting rod bearings in a specific way.
- Load strength, conformability and embedability pertain to engine bearings, but lubrication absorption does not.
- Bearing crush must be explained.
- Bearing spread must be explained.
- A standard bearing has the original dimensions specified by the manufacturer.
- An undersized bearing is designed for use on a machined crankshaft journal.
- There are three rear main oil seal variations.
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