Piston Ring: Testing and Inspection

1. Inspect piston ring end gap.





(a) Insert the piston ring into the cylinder bore.
(b) Using a piston, push the piston ring a little beyond the bottom of the ring travel, 105 mm (4.13 inch) from the top of the cylinder block.





(c) Using a feeler gauge, measure the end gap.
Standard end gap:
No.1: 0.25 - 0.35 mm (0.0098 - 0.0138 inch)
No.2: 0.35 - 0.45 mm (0.0138 - 0.0177 inch)
Oil (Side rail): 0.15 - 0.40 mm (0.0059 - 0.0157 inch)
Maximum end gap:
No.1: 0.95 mm (0.0374 inch)
No.2: 1.05 mm (0.0413 inch)
Oil (Side rail): 1.00 mm (0.0394 inch)
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.