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Small Gas Engine Measurements: Tips for Smooth Rebuilding

Explore essential tools, techniques, and areas to measure for a successful small gas engine rebuilding process. From micrometers to feeler gauges, learn to measure crankshafts, cylinders, pistons, rings, and more accurately.

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Small Gas Engine Measurements: Tips for Smooth Rebuilding

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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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