Forester AWD F4-2.5L DOHC (1998)
Piston: Description and Operation
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The piston skirt has a "slipper" design to reduce weight and sliding friction. The oil control ring groove utilizes a slit design.
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The piston pin is located in an offset position. The Nos. 1 and 3 pistons are offset in the lower direction while the Nos. 2 and 4 pistons are offset in
the upper direction.
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The piston head is recessed for both the intake and exhaust valves. It also has symbols used to identify the location and the direction of installation.
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Three piston rings are used for each piston-two compression rings and one oil ring. The top piston ring has an inner-bevel design and-the second
piston ring has an interrupt design to reduce oil consumption.