What must be ensured about the crankshaft taper and flywheel hub bore before installation?

The correct response emphasizes the importance of having both the crankshaft taper and the flywheel hub bore clean, dry, and free of any lubricants before installation. This condition is crucial for ensuring a proper fit and secure assembly. If there are any oils or contaminants present, it can lead to inadequate interference fit, which might result in slippage of the flywheel on the crankshaft during operation. A clean surface allows for a better engagement of the two components, ensuring that the flywheel is securely fastened and will function as intended.

While lubrication can be beneficial for reducing friction during assembly in certain applications, in the case of a crankshaft taper and flywheel hub, any lubricant would undermine the friction fit necessary for long-term stability and performance. Ensuring the surfaces are clean promotes optimal contact and engagement, ultimately leading to more reliable engine performance and reduced risk of component failure.