A professional who repairs and maintains gas-driven, internal-combustion engines that power electric generators, compressors, and similar equipment, using handtools and precision-measuring devices. Respnsibilities include:

• Reads operating reports and diagnoses causes of trouble.
• Disassembles engines and adjusts or replaces parts, using handtools.
• Verifies clearances and adjustments, using precision-measuring devices.
• Reassembles engines and listens to engines in action to detect operational difficulties.
• May repair air or gas compressors.