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 18. LUBRICATION 06. Oil Pressure Switch

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06. Oil Pressure Switch


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W1860BE.book Page 8 Tuesday, January 28, 2003 11:01 PM




                                                         OIL PRESSURE SWITCH
 LUBRICATION


 6. Oil Pressure Switch
 The oil pressure switch is located in the front upper portion of the right cylinder block bank. The pur-
 pose of this switch is to monitor the operation of the oil pump as well as the lubricating oil pressure
 when the engine is running.




                                                           (1)    (2)   (3)   (4)     (5)




                                                                                            LU-00061

          (1) Contact                                                               (4) Molded portion
          (2) Diaphragm                                                             (5) Terminal
          (3) Spring

 1) When oil pressure does not build up (immediately after ignition switch is turned ON):
 The diaphragm is pushed toward the cylinder block by the spring force (a force equivalent to the
 specified oil pressure). This closes the contact points, causing the oil pressure warning light in the
 combination meter to illuminate.
 2) When oil pressure reaches the specified value (after engine starts):
 After reaching the specified value of 14.7 kPa (0.15 kgf/cm2, 2.1 psi), the oil pressure pushes the
 diaphragm overcoming the spring force. This opens the contact points and the oil pressure warning
 light goes out.




                                                                 LU(H4DOTC)-8



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