What should be lubricated before installing the piston into the cylinder?

Before installing the piston into the cylinder, it is essential to lubricate the cylinder bore, piston pin, and piston rings. This lubrication serves several critical functions.

Firstly, lubricating the cylinder bore helps ensure a smooth fit between the piston and the cylinder wall, reducing friction during the initial operation. This is important because a dry start can cause excessive wear or even damage the surfaces due to metal-to-metal contact.

Secondly, lubricating the piston pin is vital as it reduces wear at the connection between the piston and the connecting rod, allowing for smoother motion as the piston reciprocates within the cylinder.

Lastly, the piston rings must also be lubricated to enhance their sliding movement against the cylinder walls and to facilitate their sealing against the combustion gases. Proper lubrication of these components minimizes the risk of scuffing and improves the overall performance and lifespan of the engine.

The other options refer to components that are not typically lubricated at the time of piston installation into the cylinder. While lubrication of the crankshaft, connecting rod, camshaft, and corresponding bearing surfaces is indeed important, it occurs at different stages of assembly rather than specifically before the piston installation.