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 05. MECHANICAL 01. General
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W1860BE.book Page 2 Tuesday, January 28, 2003 11:01 PM
GENERAL
MECHANICAL
1. General
The engine used in this vehicle is of a horizontally opposed, four-cylinder design. This four-stroke-
cycle, water-cooled, SOHC engine uses a total of 16 valves and its main components are made of
aluminum alloy. It is fueled by a multiple fuel injection system.
The engine's major structural and functional features are as follows:
The cylinder head forms pentroof combustion chambers, each having a spark plug located at its
center and two each of intake and exhaust valves (four valves per cylinder). The intake and exhaust
ports are located in a cross-flow arrangement.
There are a screw and nut at the valve end of each rocker arm. They are used for adjusting the
valve clearance.
A single timing belt drives two camshafts on the left and right banks and the engine coolant pump
on the left bank. Belt tension is automatically adjusted by a belt tension adjuster, eliminating need
for a manual adjustment.
The crankshaft is supported by five bearings with high rigidity and strength.
The cylinder block is an aluminum die casting fitted with iron die-cast cylinder liners.
(1) (2) (3) (4) (5) (6)
(14)
(13)
(12)
(11) (7)
(10)
(8)
(9)
ME-00312
(1) Camshaft (6) Camshaft cap (11) Exhaust rocker arm
(2) Intake valve (7) Valve rocker cover (12) Exhaust rocker shaft
(3) Cylinder Block (8) Cylinder Head (13) Intake rocker shaft
(4) Connecting rod (9) Oil pan (14) Intake rocker arm
(5) Spark plug (10) Exhaust valve
ME(H4SO)-2
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