How to Replace the Piston Opel Omega B

Remove

1. 1. Carefully lever out retaining ring (1) with screwdriver and press out piston pin.

Important. Important:

2. 2. Piston and piston pin are paired to each other and must not be mixed up. Measure
3. 3. Before installing the piston, measure the piston installation play. Measure diameter of piston with commercially available micrometer, 7 mm (I) from lower edge of piston and offset by 90° from piston pin axis.
4. 4. Determine value at the micrometer.

Adjust

5. 5. Place appropriate insert and Dial Gauge MKM-571-B in internal precision micrometer and use micrometer to set Dial Gauge MKM-571-B to zero. Measure
6. 6. Measure cylinder bore at bottom (3), centre (2) and top (1) alternating crosswise.
7. 7. Piston installation play: With new engine: 0.031 up to max. 0.063; with old engine: up to max. 0.15 mm. Example: Cylinder bore diameter: 80.000 mm Piston diameter: – 79.955 mm Piston installation play: 0.045 mm

Important. Note installation position of piston and con-rod.

8. 8. Fit con-rod and piston in such a way that when the pairing number (1) is visible, the arrow on the base of the piston points towards the engine timing side. Install, attach
9. 9. Grease piston pin lightly and insert manually.
10. 10. Install new retaining rings (2).

Note. Securing ring openings (arrow) are arranged opposite the recess in the eye of the piston pin.