Cylinder Block - Subaru LEGACY 2002 Quick Reference Index

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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.

CYLINDER BLOCK

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