Remove the pan, oil feed pipe and deflector (if used).
Remove the oil pump.
Remove the pistons and connecting rods as described in the previous section. Unless the pistons and connecting rods need to be repaired, there is no need to push the pistons out of the cylinders.
Turn the engine over so that the crankshaft is at the top.
Before removing the crankshaft, check its offset along the axis using a dial gauge. Determine whether new bearing shells need to be installed.
If you don't have such a device, you can use a set of probes.
The main bearing caps are numbered 1 through 4, starting from the end of the timing belt. Rear (from the flywheel side) the cover is not marked. To ensure correct installation, remember that the numbers are counted from the side where the coolant pump is located.
Original posted on the website opelbook
Loosen the main bearing cap bolts and remove them.
Remove the crankshaft from the engine crankcase.
Remove the upper bearing shells and mark their position if they can still be used later.
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