Forester F4-2.5L Turbo (2009)
Piston Ring: Specifications
Piston ring
Ring closed gap
Top ring Standard ........................................................................................................................................................ 0.20 - 0.25 mm (0.0079 - 0.0098 in)
Second ring Standard ...................................................................................................................................................... 0.37 - 0.52 mm (0.015 - 0.0203 in)
Oil ring Standard ........................................................................................................................................................... 0.20 - 0.50 mm (0.0079 - 0.0197 in)
Ring groove gap
Top ring Standard ..................................................................................................................................................... 0.040 - 0.080 mm (0.0016 - 0.0031 in)
Second ring Standard ................................................................................................................................................ 0.030 - 0.070 mm (0.0012 - 0.0028 in)
