Final answer:
The correct installation of cam bearings involves aligning oil holes and following manufacturer guidelines, rather than simply driving bearings flush to the bore edges as suggested by A and B. The use of specialized tools and adherence to service manuals is essential. The correct option is Neither.
Step-by-step explanation:
When installing cam bearings in the cylinder block, proper positioning is critical for the functionality of the engine. The process involves driving each cam bearing into its corresponding bore within the block. However, the assertion made by A and B is not entirely accurate for all situations. Typically, bearings should be installed carefully according to the engine manufacturer's specifications, which often means they are positioned so that oil holes in the bearings line up with the oil passages in the block, and not necessarily flush with the edges of the bore. While the front bearing may often be installed flush with the front edge of the bore, this practice might not apply to all the bearings or engines.
Specialized tools known as bearing installers or drivers should be used to install the bearings to ensure they are seated correctly without damaging them. Extensive care must be taken not to distort the shape of the bearing or damage the surface. It is essential to verify that the bearings are correctly seated and aligned to prevent premature failure or damage to the camshaft and the engine itself. Therefore, neither A nor B is completely correct; the specific engine design and manufacturer instructions will determine the correct installation depth for each bearing.
Professional Tips for Cam Bearing Installation:
Always refer to the manufacturer's service manual for specific instructions.
Ensure correct alignment of oil holes between the cam bearings and the cylinder block.
Use the appropriate bearing driver tool for installation.
Check for a smooth, unobstructed rotation of the camshaft after the installation of the bearings.