Monoblock Engines

A monoblock engine is an engine in which, the components such as the cylinder block, head and the crankcase are cast as a single unit. The casting is made from alloys with high tensile strength. The cooling water jacket is also cast in the block. This eliminates leakages and increases reliability. 

Besides, thermal stress from unequal temperatures are minimized. There is also no need for cylinderhead bolts, gaskets, which reduces maintenance costs. The design has higher manufacturing cast. It is also difficult to service the valve seats.

 Since the cylinder head cannot be removed, the pistons, the connecting rods and the crankshaft may have to be removed to gain access to the valve seats.