Small Engine Mechanics

This program explores the basic principles behind the operation of AC and DC motors. An explanation is given about how one or more fixed magnets, either permanent or electromagnetic, can cause linear movement or rotation of a current-carrying wire. A hand rule is developed to predict motor force. Motor torque is explained as a prelude to the practical design of a direct current motor. Specific modules include Motors and Magnets, Current and Magnet Interaction, Left-Hand Rule, Motor Force, Motor Torque, and DC Motors. Correlates to all National CTE Organizational Standards (including the provisions of the Perkins Act). A viewable/printable instructor's guide is available online. A Shopware Production. (18 minutes)

Introduces the operation, construction and design variations of small gas engines. Live-action video footage and computer graphics are used to explain how both two- and four-stroke engines operate. Design variations, such as poppet vs. reed valves, valves-in-block vs. overhead valves, gasoline vs. diesel vs. LP gas, air vs. liquid cooled are all explained. (27 min.) A Meridian Production.

Explains the major steps for engine teardown and rebuilding. Instructional footage stresses safety, part organization, and use of proper tools. The program prepares students for working on any engine. (20 min.) A Meridian Production.

Summarizes how to inspect each part during a major rebuild of a small gas engine and how to find part damage and measure wear accurately so students know which parts should be replaced and which can be reused. Live-action video and computer graphics explain part clearances-which are critical to engine life. Clear visuals show the proper use of cleaning tools and equipment. The last part of the program shows a valve job using both carbide cutter and a valve grind machine. (26 min.) A Meridian Production.

Shows how to properly reinstall a major part of a small gas engine. Students will learn to assemble both two- and four-stroke cycle engines. Clear, live-action video emphasizes safety, proper gasket and seal installation, correct utilization of torque valves, and tightening patterns. (23 min.) A Meridian Production.

Summarizes how to properly troubleshoot both performance and mechanical problems in small gas engines. Logical diagnosis methods are supplemented with computer graphics that show what causes a rod knock, piston slap, and low compression. Engine maintenance and basic tune-up are also included. (35 min.) A Meridian Production.

This five-part series covers the operation, maintenance, disassembly, and assembly of small gas engines. A Meridian Production.