Subaru 2002 Impreza Service Manual page 191

GENERAL
Lubrication
A: NON-TURBO MODEL
NF0057
(1) Oil filter
(2) Oil pump
(3) Oil strainer
(4) Camshaft
(5) Roller
(6) Rocker arm
(7) Rocker shaft
(a) Bypass valve opening pressure:
157 kPa (1.6 kgf/cm2, 23 psi)
(b) Relief valve opening pressure:
490 kPa (5.0 kgf/cm2, 71 psi)
LU-3