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Start…. Small Gas Engine Measurements. Tips for a Smooth Rebuilding Process. Outline. Introduction to tools How to use tools What areas to measure How to measure. Tool Types. Telescoping. Gauge. Gap Gauge. Micrometer. Feeler Gauge. Caliper Gauge. Ruler. Micrometers.

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Presentation Transcript

  1. Start….

  2. Small Gas EngineMeasurements Tips for a Smooth Rebuilding Process

  3. Outline • Introduction to tools • How to use tools • What areas to measure • How to measure

  4. Tool Types Telescoping Gauge GapGauge Micrometer FeelerGauge Caliper Gauge Ruler

  5. Micrometers • Reading a micrometer • Use two 90 degree measurements for round surfaces • Is used with other tools • Areas to use for small gas engines • Journal measurements for crankshaft • Cylinder measurements • Piston measurements

  6. Feeler and Gap Gauges • Gap gauges are used to measure spark plug gap • Feeler gauges are used in making extremely thin measurements • Use a feeler gauge • Ring measurements • Ignition point gap • Valve tappet clearance

  7. Measurements to Check • Compression check • Spark plug gap • Ignition point gap • Armature air gap • Crankshaft • Cylinder • Piston and rings More...

  8. Valve and tappet clearance • Carburetor float height

  9. Compression Check • Two main ways to check compression • Using a compression gauge • Rotating the flywheel in the wrong direction

  10. Spark Plug Gap • Check condition of spark plug first • Use a Gap Gauge • Check engine manual for specs Gap

  11. Ignition Point Gap • Use a feeler gauge to check • Check manual for specs • Adjust size of gap as needed • Make sure points hit squarely Adjustment screw

  12. Armature Air Gap • Use a thick piece of paper or normal cardboard to measure • To adjust loosen screws on sides and slide up or down as needed Adjustment Air Gap Screws Flywheel

  13. Crankshaft • Use micrometer to measure • Compare results to manual specs • Get journal measurements for • Drive end • Connecting rod • Magneto end

  14. Crankshaft Connecting Rod Journal Drive End Journal Magneto End Journal

  15. Cylinder • Use a telescoping gauge or an inside caliper gauge with a micrometer • See engine manual for specs • Check more than one depth • Top, center, and bottom of travel • Most wear will occur at the top due to ring travel • Make sure to check each depth twice at 90 degrees to the first

  16. Piston and Rings • For the piston use a micrometer • Take measurements at top, bottom, and skirt of piston • Compare results to manual specs More...

  17. …Rings • Use a feeler gauge for all ring measurements • Check ring side clearance with rings in piston ring grooves • Remove rings for end gap measurements • Use piston to evenly place rings inside cylinder for measurements More...

  18. ….Rings • Remove and replace rings carefully with a ring expander • Compare results to manual specs

  19. Valve and Tappet Clearance • Make measurements with a feeler gauge • Check results against engine manual specs • Make measurements while the valves are closed

  20. Carburetor Float Height • Measure float height with a ruler • Check manual for suggested height • Adjust height to acquire the correct fuel intake

  21. Summary • Introduction to tools • How to use tools • What areas to measure • How to measure

  22. TheEnd

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