Engine Block
The engine block is manufactured in two halves from sand cast nodular iron. The top portion (main cylinder block) includes the cylinder bores and has provisions for five main bearing top shells. The lower portion (support ladder) incorporates the lower main bearing shells and support for the rear main oil seal. The engine block and ladder are machined as a matched pair and are not serviced as individual components. Three locating dowels are used to ensure perfect alignment between the support ladder and the engine block.
Scheme 719
Scheme 720
A number is stamped on the engine block and the same number is stamped on the bearing ladder. This ensures that the matched pair of components remain together during engine assembly. The other number stamped on the block is the engine plant serial number.