Which Direction Should the Piston Arrow Face?

1 Answers
SophiaRose
07/29/25 10:24am
The orientation of the piston arrow is as follows: Towards the exhaust valve: The top surface of the piston has an arrow mark, and during installation, the arrow should face the direction of the exhaust valve, which is the front end of the vertical engine. This helps reduce the impact of the piston on the cylinder wall. Close to the intake valve: The top surface of the piston has an "IN" mark, and the side with the "IN" mark should be installed closer to the intake valve. Towards the front of the engine: A small notch is made on the edge of the piston top. During assembly, the small notch on the piston top should align with the small raised mark on the connecting rod body and connecting rod cap, facing the front of the engine.
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