Piston Ring End Gap

WARNING: This page is about a different variant/trim than selected.

Insert piston ring until it is in the middle of the cylinder bore and measure the end gap.
1. Standard
2. Top ring : 0.23 - 0.33 mm (0.0091 - 0.0130 in)
3. 2nd ring : 0.33 - 0.48 mm (0.0130 - 0.0189 in)
4. Oil ring : 0.20 - 0.50 mm (0.0079 - 0.0197 in)
5. Limit:
6. Top ring : 0.54 mm (0.0213 in)
7. 2nd ring : 0.80 mm (0.0315 in)
8. Oil ring : 0.95 mm (0.0374 in)
If out of specification, replace piston ring. If gap still exceeds the limit even with a new ring, re-bore cylinder and use oversized piston and piston ring.

Fig 1: Checking Piston Ring End Gap
Courtesy of NISSAN MOTOR CO., U.S.A.