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 10. Piston
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W1860BE.book Page 12 Tuesday, January 28, 2003 11:01 PM
PISTON
MECHANICAL
10.Piston
The pistons are of a slipper skirt design for reduced weight and friction. The oil control ring groove
utilizes a thermal design.
The piston pin is offset either downward (Nos. 1 and 3 pistons) or upward (Nos. 2 and 4 pistons).
The piston head has recesses to prevent interference with the intake and exhaust valves. It also
has engraved marks to identify the piston size and the direction of installation. All the pistons are
common in their design.
Three piston rings are used for each piston -- two compression rings and one oil control ring. The
top piston ring has inner bevels and the second piston ring has an interrupt (cut) on the bottom out-
side to reduce oil consumption.
(2)
(3)
(a)
(1) (A)
B5SH
(B)
(b)
(c)
(d)
(C)
(e)
ME-00348
(1) Location mark (engine front side) (A) Top ring (a) Inner-bevel
(2) Identification mark (piston size) (B) Second ring (b) Cut
(3) Engine displacement (C) Oil ring (c) Upper rail
(d) Expander
(e) Lower rail
ME(H4SO)-12
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