Piston Ring: Testing and Inspection

INSPECT PISTON RING GROOVE CLEARANCE



1. Using a feeler gauge, measure the clearance between new piston ring and the wall of the piston ring groove.

Ring groove clearance:
No.1: 0.011 - 0.070 mm (0.0004 - 0.0028 in.)
No.2: 0.030 - 0.070 mm (0.0012 - 0.0028 in.)

2. If the clearance is not as specified, replace the piston.

INSPECT PISTON RING END GAP



1. Insert the piston ring into the cylinder bore.
2. Using a piston, push the piston ring a little beyond the bottom of the ring travel, 105 mm (4.1300 in.) from the top of the cylinder block.




3. Using a feeler gauge, measure the ring end gap.

Standard ring end gap:
No.1: 0.300 - 0.470 mm (0.0118 - 0.0185 in.)
No.2: 0.350 - 0.520 mm (0.0138 - 0.0205 in.)
Oil (Side rail): 0.130 - 0.450 mm (0.0051 - 0.0177 in.)

Maximum ring end gap:
No.1: 1.070 mm (0.0421 in.)
No.2: 1.120 mm (0.0441 in.)
Oil (Side rail): 1.050 mm (0.0413 in.)

4. If the end gap is greater than maximum, replace the piston ring. If the end gap is greater than maximum, even with a new piston ring, replace the cylinder block.