Indonesian translation: Poros engkol, Poros bubung
Login or register (free and only takes a few minutes) to participate in this question.
You will also have access to many other tools and opportunities designed for those who have language-related jobs (or are passionate about them). Participation is free and the site has a strict confidentiality policy.
Explanation: In the linked illustration (I) is the camshaft and (P) is the crankshaft. The Camshaft is used to open and close the intake and exhaust valves and the crankshaft is what converts the reciprocating motion of the pistons to rotating motion.