Piston Ring, Engine

Piston ring
No. 1
Ring groove clearance 0.030 to 0.080 mm (0.0012 to 0.0031 in.)
No. 2
Ring groove clearance 0.020 to 0.060 mm (0.0008 to 0.0024 in.)
No. 1
Standard end gap 0.300 to 0.400 mm (0.0118 to 0.0158 in.)
No. 2
Standard end gap 0.400 to 0.550 mm (0.0158 to 0.0217 in.)
Oil (side rail)
Standard end gap 0.130 to 0.380 mm (0.0051 to 0.0150 in.)
No. 1
Maximum end gap 1.10 mm (0.0433 in.)
No. 2
Maximum end gap 1.30 mm (0.0512 in.)
Oil (side rail)
Maximum end gap 0.90 mm (0.0354 in.)