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Lubrication (SOHC) - Mechanism & Function: Other Subaru Forester SG

Lubrication System 4 illustrations ~322 words

Oil Filter

The oil filter is a full-flow filtering, cartridge type that utilizes a paper element. It also has a built-in bypass valve. The filter element has a special pleat design to increase the effective filtering area.

Scheme 4

Scheme 4: Oil Filter

Scheme 5

Scheme 5: Oil Pan and Oil Strainer
  1. The oil pan is attached to the cylinder block using liquid gasket for sealing. The oil strainer is a metal net type and removes large foreign particles from the engine oil. It is located in the middle of the oil pan. The pipe from the strainer is connected to the suction port of the oil pump in the left bank of the cylinder block.
  2. There is a baffle plate in the oil pan, near the bottom of the cylinder block. It stabilizes the oil level and reinforces the oil pan.

Oil Pressure Switch

The oil pressure switch is located in the front upper portion of the right cylinder block bank. The purpose of this switch is to monitor the operation of the oil pump as well as the lubricating oil pressure when the engine is running.

Scheme 6

Scheme 6: Oil Pressure Switch
  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/cm 2 , 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.

Oil Cooler (AT Model Only)

The oil cooler used in AT models is of a water cooled type. It serves to maintain engine oil in proper temperature range and so prevent degradation of lubricating oil performance.

Scheme 7

Scheme 7: Oil Cooler (AT Model Only)