Opel Astra, Zafira

1. By means of a special vertical drill completely remove traces of step deterioration from the top part of cylinders — operate according to the instructions of the manufacturer enclosed to a vertical drill. The step is formed on piston stroke border, approximately in 6.4 mm under the top cut of the cylinder at the expense of mechanical development of metal and нагарообразования, to define its presence it is possible to the touch a finger nail. Attempts of extraction of shatunno-piston assemblages without removal of step development are fraught with damage of pistons.

2. Having finished preparation of cylinders, turn the engine upside down so that the cranked shaft has appeared from above.

3. Before to remove rods from a cranked shaft, estimate size axial люфта their landings to corresponding necks of the last. Densely enter an edge () measuring щупа in a backlash between a lateral wall of the bottom head of a rod and a crank cheek, completely having chosen люфт a rod on a shaft neck. The total thickness of the picked up edges щупа also will equal to size axial люфта a rod. Compare result of the spent measurement to requirements (Specifications see). If the size axial люфта exceeds the limiting admissible value, the given rod is subject to replacement. Axial люфт a new rod, or old on new to a shaft, it can appear less than the bottom admissible limit, in this case the rod can be pierced, — consult with experts of car-care centre. Serially check up all remained rods.

4. Make sure available on the bottom heads of rods and their covers of identification labels of an accessory to the cylinder, in case of need put labels independently by means of small кернера or a marker.

5. Turn a cranked shaft so that pistons of 1st and 4th cylinders have appeared in positions НМТ.
6. In stages (on 1/2 turns for the approach) ослабьте nuts / bolts of fastening of a cover of the bottom head of a rod of the first cylinder so that there was a possibility отворачивания them manually. Uncover a rod together with the loose leaf of the bearing placed in it, — try not to drop last.

7. For protection of a neck of a shaft and a cylinder mirror pull on hairpins of fastening of the bottom head of a rod pair of pieces of a hose approaching on the size.
8. Take from a head of a rod the bearing loose leaf, then, having rested the wooden handle of a hammer against bearing bed in the bottom head, push out shatunno-piston assemblage from the block at the top the cylinder. At resistance occurrence immediately stop extraction of assemblage and make sure of completeness of removal of step deterioration in the top part of the cylinder.
9. Operating in a similar manner, take from the engine shatunno-piston assemblage of 4th cylinder, then turn the engine on 180 ° clockwise and take assemblages of 2nd and 3rd cylinders.

Extraction start only after the rod will be located strictly in parallel a cylinder axis!