Mechanical
CYLINDER BLOCK
ME-8
7. Cylinder Block
! The cylinder block of this horizontally-opposed-cylinder engine is made of aluminum die casting.
It is split into right and left halves at its center where the crankshaft is supported. The cylinder lin-
ers are made of cast iron and are embedded as integral part of the cylinder block body during the
casting process.
! The coolant passages of the right and left banks are independent of each other (parallel-flow
type). The water jackets around the cylinder liners are open at the cylinder head side end of each
bank (open-deck design).
! The cylinder block supports the crankshaft’s journals through seven main bearings rigidly and
quietly. The #7 bearing is a flanged thrust bearing which controls the crankshaft’s end play.
! Rigid engine-to-transmission connection is ensured by 11 bolts (three more bolts than with the
four-cylinder engine).
! The aluminum die-cast upper oil pan located below the cylinder block reinforces connection be-
tween the cylinder block banks and its special form provides a buffle effect to suppress large fluc-
tuation of oil level. In addition, the upper oil pan constitutes part of the oil and cooling circuits as
well as the water pump volute chamber and thermostat chamber.
B2H4296
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