It has an aluminium alloy engine block with cylinder liners.

The engine featured open ended cylinder liners (advanced technology for the period) and pressurized liquid cooling.

This allowed engineers to specify a much tighter cold-play between the piston and the cylinder liner.

The engine block is cast aluminum 319-T5 alloy with cast-iron cylinder liners.

Other Z engines have aluminum alloy block and head, with cast-iron cylinder liners.

The unit's thin cylinder liners cracked and became detached.

This was done by using larger diameter cylinder liners and also increasing the stroke.

Result: communication to captain that a cylinder liner and a piston needed changing.

An important advantage is the removable wet cylinder liners which will assist with easier maintenance and lower costs.

This engine used cast-iron cylinder liners and a cast-iron head.