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Lesson. Measuring Engine Components and Specifications. Interest Approach. How are internal combustion engine specifications determined?. Student Learning Objectives. Identify measuring and testing equipment for internal combustion engines

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  1. Lesson Measuring Engine Components and Specifications

  2. Interest Approach • How are internal combustion engine specifications determined?

  3. 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.

  4. Compression gage Dial indicator Flat feeler gage Inside micrometer set Micrometer caliper Plastigage Round-wire gage Tachometers Telescoping gage Torque wrench Terms

  5. Tools Used in Measuring Engine Components • Micrometer caliper – precision measuring tool for taking outside measurements. • Inside micrometer – determines the inside of a cylinder.

  6. Tools Used in Measuring Engine Components • Flat feeler gage – recognizes the spacing between two surfaces. • Dial indicator – recognizes the spacing between two surfaces and records readings of the dial needle.

  7. 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.

  8. Plastigage

  9. Tools (continued) • Torque wrench – the hand tool used for torque which bolts and nuts must be tightened to. • Compression gage – helps in determining if there is a problem with the cylinder, piston rings, valves, or gaskets. • It measures compression pressure in pounds per square foot.

  10. CompressionGage

  11. Tools (continued) • Telescoping gage – a tool used for measuring inside diameter. • Tachometers – used for reading revolutions per minute.

  12. Telescoping Gage

  13. 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 .

  14. Four major specifications on small engines • Fuel • Oxygen • Compression • Ignition

  15. Fuel • Use the fuel recommended by the manufacturer. • Guidelines for carburetor adjustments: • Turning valve clockwise creates leaner fuel mixture. • Turning valve counter clockwise creates richer fuel mixture.

  16. Oxygen • Engines need to take in clean air in order for combustion to occur. • Air filters should be routinely checked and cleaned.

  17. Compression • Not having compression indicates a serious problem in the engine. • Quick test method: pull the starter rope. • If there is no resistance against the starter rope, the engine lacks compression.

  18. Ignition • Routinely check spark plugs. • Clean the electrodes with a wire brush. • If reinstalling spark plugs, the plug gap should be adjusted properly.

  19. Setting the gap on a spark plug

  20. Review / Summary • What 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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