Parts of an engine. Test your knowledge!

What is 1?
What is 2?
What is 3?
What is 4?
What is 5?
What is 6?
What is 7?
What is 8?
What is 9?
What is 10?
What is 11?
What is 12?
What is 13?
What is 14?
What is 15?
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