Subaru Workshop Service and Repair Manuals

Piston Ring: Specifications

Piston Ring Gap:

Top Ring:

Standard ..........................................................................................................................................................  0.20 - 0.35 mm (0.0079 - 0.0138 inch)
Limit ............................................................................................................................................................................................  1.0 mm (0.039 inch)

Second Ring:

Standard ..........................................................................................................................................................  0.37 - 0.52 mm (0.0146 - 0.0205 inch)
Limit ............................................................................................................................................................................................  1.0 mm (0.039 inch)

Oil Ring:

Standard ..........................................................................................................................................................  0.20 - 0.60 mm (0.0079 - 0.0236 inch)
Limit ............................................................................................................................................................................................  1.5 mm (0.059 inch)

Clearance Between Piston Ring And Piston Ring Groove:

Top Ring:

Standard ......................................................................................................................................................  0.040 - 0.080 mm (0.0016 - 0.0031 inch)
Limit ........................................................................................................................................................................................  0.15 mm (0.0059 inch)

Second Ring:

Standard ......................................................................................................................................................  0.030 - 0.070 mm (0.0012 - 0.0028 inch)
Limit ........................................................................................................................................................................................  0.15 mm (0.0059 inch)