Piston Rings
WARNING: This page is about a different car, the 2004 Suzuki Vitara. However, it is still accessible from the selected car via links, so may be relevant.
To measure end gap, insert piston ring into cylinder bore and then measure the gap by using thickness gauge. If measure gap is out of specification, replace ring.
NOTE:
Clean carbon and any other dirt from top of cylinder bore before inserting piston ring.