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Chapter 8

Chapter 8. Advanced Small Engine Maintenance and Repair Projects. A friction surface is placed in contact with a drive disc, which is connected to an engine. Certain engine components must first be removed before an engine can be cleaned of carbon deposits.

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Chapter 8

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  1. Chapter 8 Advanced Small Engine Maintenance and Repair Projects

  2. A friction surface is placed in contact with a drive disc, which is connected to an engine.

  3. Certain engine components must first be removed before an engine can be cleaned of carbon deposits.

  4. For best operation, the cylinder should be removed and cleaned of carbon deposits every 100 hours of operation.

  5. A cylinder head is easily reassembled once carbon deposits have been removed.

  6. A reference chart can be consulted to review and illustrate the proper method for using a DMM on a Briggs & Stratton engine electrical system or component.

  7. An AC voltage test is first performed to verify that a stator has the potential to provide current to a regulator.

  8. DC current exiting a regulator/rectifier is tested to verify that the electrical system of an engine is operating properly.

  9. A stator located under a flywheel is accessed by removing the flywheel, screen, and blower housing.

  10. When a stator is mounted outside a flywheel, the stator is easily removed by loosening the two mounting bolts and lifting it off the engine.

  11. The air gap between a stator and flywheel must be set precisely for the stator to function properly.

  12. Ignition armatures have evolved from being of the breaker-points to solid-state types.

  13. An ignition armature is installed by using a socket wrench and feeler gauges.

  14. A stop switch is tested by attempting to start the engine while it is connected to a spark tester.

  15. To improve engine operation and extend the operating life of the engine, an old ignition module can be removed and replaced with a more modern ignition module.

  16. The valve design for a four-stroke cylinder small engine includes one intake valve and one exhaust valve per cylinder.

  17. The valves of L-head engines are located on one side of the cylinder. The valves of overhead valve engines are located in the cylinder head.

  18. A tappet clearance is the spacing between the valve stem and the tappet. It may need to be adjusted after lapping and re-installing a valve.

  19. The valve chamber on a small engine is accessed by removing the muffler, crankcase breather, and cylinder head.

  20. Spring retainers are removed with a valve spring compressor and needle-nose pliers.

  21. Valves are removed after compressing the springs and removing the retainers, compressors, and springs.

  22. Valves are inspected to help identify the source of an engine problem.

  23. Valve lapping is done to repair minor scoring and pitting of the valve face and seat and to restore the ability of the valve to seal the combustion chamber.

  24. Valves with spring retainers are reinstalled using valve spring compressors.

  25. The parts of an over-head valve cylinder head may differ, depending on the engine model and manufacturer.

  26. Overhead valves are reinstalled using a torque wrench and socket wrench or nut driver set.

  27. Overhead valves must be adjusted for proper operation once they are reinstalled.

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