Note:
- The piston ring end gap must be measured in the cylinder bore to which the piston ring will be fitted to on installation.
- Ensure all piston rings are fitted in their original locations (if original rings are being reused) or to the piston/bore which the end gaps were checked (if new rings are being installed).
- Position the piston ring into the top of the cylinder bore.
- Using the piston crown, push the piston ring down into the bore (the piston will keep the piston ring square) until the third groove of the piston is level with the top of the bore.
- Remove the piston and measure the gap between the ends of the piston ring, using a feeler gauge.
![](https://motoinstruction.ru/img/triumph/15/121224.jpg)
Checking piston ring end gap
2. When checking the piston ring end gap, always refer to the specifications table (see Pistons).
Note:
- If the end gap is too large, replace the piston rings with a new set.
- If the gap remains too large with new piston rings, both the pistons and barrels must be replaced.
- If the gap is too small, check the cylinder bore for distortion, replacing as necessary.
- Do not file the piston rings.
3. Repeat the procedure for the remaining piston rings.