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• Measuring Engine Components and Specifications
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Next Generation Science/Common Core Standards Addressed!
CCSS.ELA Literacy.RST.9‐ 10.3 Follow precisely a complex multistep procedure when carrying out experiments, taking measurements, or performing technical tasks, attending to special cases or exceptions defined in the text.
CCSS.ELA Literacy. RST.11‐12.2 Determine the central ideas or conclusions of a text; summarize complex concepts, processes, or information presented in a text by paraphrasing them in simpler but still accurate terms.
CCSS.ELA Literacy.RST.11‐12.3 Follow precisely a complex multistep procedure when carrying out experiments, taking measurements, or performing technical tasks; analyze the specific results based on explanations in the text.
HSNQ.A.3 Choose a level of accuracy appropriate to limitations on measurement when reporting quantities. (HS‐PS1‐2),(HSPS1‐4),(HS‐PS1‐5),(HS‐PS1‐7)
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Agriculture, Food and Natural Resource Standards Addressed!
PST.03.01. Troubleshoot, service and repair components of internal combustion engines using manufacturers’ guidelines.
PST.03.01.01.b. Analyze and explain how the components of internal combustion engines interrelate during operation.
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Bell Work / Student Learning Objectives
Identify measuring and testing equipment for internal combustion engines.
Identify the specifications of an internal combustion engine.
Explain four major specifications to be checked on small engines.
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Terms
Compression gage
Dial indicator
Flat feeler gage
Inside micrometer set
Micrometer caliper
Plastigage
Round-wire gage
Tachometers
Telescoping gage
Torque wrench
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Interest Approach
How are internal combustion engine specifications determined?
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Tools used in measuring engine components
Inside micrometer – determines the inside of a cylinderMicrometer caliper – precision measuring tool for taking outside measurements. Flat feeler gage – recognizes the spacing between two surfacesDial indicator – recognizes the spacing between two surfaces and records readings of the dial needle
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Engine Tools (continued)
Round-wire gage – used in measuring the electrode gap of spark plugs
Plastigage – a thin, plastic, threadlike material used to measure the clearance between the bearing journal on a crankshaft and the bearing rod cap
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Engine Tools (continued)Compression gage – helps in determining if there is a problem with the cylinder or piston rings.
Compression gauge It measures compression pressure inside the cylinder in pounds per square foot.
Torque wrench –a wrench designed to measure turning force (torque) placed on fittings.
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Engine Tools (continued)
Telescoping gage – a tool used for measuring inside diameter
Tachometers – used for reading revolutions per minute
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Telescoping Gage
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Specifications of an internal combustion engine
Charts detail the exact specification to increase performance and prolong life
Related to engine size and work requirements
Clearances of the intake and exhaust valves
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Four major specifications on small engines
Fuel
Oxygen
Compression
Ignition
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Fuel
Use the fuel recommended by the manufacturer
Guidelines for older engines with carburetor adjustments:
Turning valve clockwise creates leaner fuel mixture
Turning valve counter clockwise creates richer fuel mixture
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OxygenEngines need to take in clean air in order for combustion to occur.
Air filters should be routinely checked and cleaned
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Compression
Not having compression indicates a serious problem in the engine
Quick test method with a small engine: pull the starter rope. If there is no resistance against the starter rope, the engine lacks compression
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Ignition
Routinely check spark plugs
Clean the electrodes with a wire brush
If reinstalling spark plugs, the plug gap should be adjusted properly
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Review/SummaryWhat are some of the instruments used for measuring internal combustion engines?What are the specifications of an internal combustion engine?What are four major specifications that are commonly checked on small engines?
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The End!