Four-stroke engine cycles and engine bore measurement guide Grade 10 Power Mechanics in Term 3, structuring 41 workshop sessions across 10 pages. Apprentices dismantle small internal combustion power units and take precision mechanical readings.
The term unfolds under the Engines strand:
- Internal Combustion: tracing intake, compression, power, and exhaust strokes, defining TDC and BDC, and contrasting fuels in weeks 1 and 2.
- Dimensional Metrology: measuring cylinder diameters with vernier callipers, checking piston depth, and calculating displacement volumes in weeks 2 and 3.
- Valves and Pistons: inspecting cylinder walls, checking ring end gaps with feeler gauges, and seating poppet valves during weeks 4 to 6.
- Engine Service: testing compression pressure in week 7, concluding with oil seal replacements and workshop tool servicing in weeks 8 and 9.
