How to Replace the Piston Rings Opel Astra G

Note. Piston with con-rod removed - see operation "Piston with Con-rod, Remove and Install"

Remove

1. 1. Remove piston rings • Use piston ring wrench (1) • Remove oil carbon from groove with split piston ring, filed to a wedge-shape
2. 2. Measure piston ring gap • Tension piston ring in cylinder and measure gap with feeler gauge • Permissible ring gap: – Rectangular compression ring (2) : 0.25 to 0.50 mm – Minute ring (3): 0.25 to 0.50 mm – Oil scraper ring (4): 0.25 to 0.75 mm

3. 3. Check piston ring vertical play with feeler gauge in piston ring groove. • Permissible vertical play – Rectangular compression ring (1): see "Technical data" – Minute ring (2): see "Technical data" – Oil scraper ring (3): see "Technical data"

Install

4. 4. Install piston rings • Insert into pistons with piston ring wrench and "TOP" pointing upwards • Set piston ring gap – First piston ring (right-hand ring) in position (1) – Second piston ring (minute ring) in position (2) – Interim ring of oil scraper ring in position (3), steel band rings of oil scraper ring in position (4) and/or (5)