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) 02. Timing Belt
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W1860BE.book Page 3 Tuesday, January 28, 2003 11:01 PM
TIMING BELT
MECHANICAL
2. Timing Belt
A single timing belt drives four camshafts (intake and exhaust camshafts on each bank). The belt
also drives the water pump by its non-toothed side.
The timing belt teeth have a specially designed round profile which contributes to quiet operation.
The timing belt is made of strong and inflexible core cords, wear-resistant canvas and heat-resistant
rubber material.
A hydraulic automatic belt tension adjuster always keeps the belt taut to the specified tension. Any
manual belt tension adjustment is unnecessary.
(15) (1)
(3)
(2) (4)
(5) (6) (5)
(13)
(13)
(7)
(5) (5)
(6)
(5) (5)
(9)
(13) (12) (11) (8)
(14) (10)
(6)
ME-00752
(1) Timing indicator (for timing mark of crankshaft pulley) (9) Water pump pulley
(2) *Piston position mark (10) Idler No. 2
(3) Belt tension pulley (11) Timing belt
(4) Automatic belt tension adjuster assembly (12) Crankshaft sprocket
(5) Alignment mark (13) Idler
(6) **Piston position mark (14) Exhaust camshaft sprocket RH
(7) Intake camshaft sprocket LH (15) Intake camshaft sprocket RH
(8) Exhaust camshaft sprocket LH
NOTE:
*: The #1 piston is set at the top dead center (TDC) when the piston-position mark on the crankshaft
sprocket is aligned with the mark on cylinder block.
**: The #1 piston is set at TDC on the compression stroke when the piston-position mark on the
camshaft sprocket is facing directly upward.
ME(STi)-3
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