Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 25. MECHANICAL (STi) 07. Cylinder Block
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W1860BE.book Page 10 Tuesday, January 28, 2003 11:01 PM
CYLINDER BLOCK
MECHANICAL
7. Cylinder Block
With the engine for the STi model that generates increased torque outputs, the cylinder block
uses a semi-closed deck design which can hold the cylinder liners with higher rigidity.
The cylinder liners are made of cast iron. They are dry type which means their outer surfaces are
entirely in contact with the cylinder block.
The cylinder block supports the crankshaft at its five journals. The journal supporting portions are
designed such that sufficient stiffness and quiet operation are ensured.
Sintered material is fit in the casting at the #5 journal to achieve further quietness.
The oil pump is located in the front center of the cylinder block and the engine coolant pump is
located at the front of the left-cylinder bank. At the rear of the right-cylinder bank is an oil separator
which removes oil mist contained in blow-by gas.
ME(STi)-10
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