5-8 cm meaning in our measurement approximately 2-3 inches
(sorry still have to think in English first).
Did you remove the retainers for the trim rams and the rod that goes through the upper gear housing?
Usually if the outdrive is stuck on, it won't move back that far. Has it moved back far enough to clear the 6 mounting studs on the transom mount? What can cause it to not come off is rust on the driveshaft splines where they fit into the engine coupler, or rust on the driveshaft where it passes through the gimble bearing. This is why checking the bellows for water leaks is so important, water in there causes maintenance head aches. Anyway, if you have a stand to support the drive, you might try pulling it back and forth (be careful not to pinch your fingers between the drive and the transom mount) to break loose any corrosion that might be causing it to hang up. Now I have an OMC Cobra and the transom design is very similar but the design of the shift cable is different. On the Cobra, the drive will come right off without disconnecting the cable at all, there is a cable guide that fits into the shift rod on the outdrive. On the Volvo, the cable comes through the upper gear housing and mates up with the bell crank on the shift rod. Is it possible that the cable end is hanging up on the hole it passes through in the upper gear housing? Have someone look at the cable end when you try to remove the drive. I would check this last point, first. Others here have more Volvo knowledge than I, since the only boat I have owned has the Cobra....
Look here, post number 4...did you remove the connector from the shift cable end???
http://forums.iboats.com/forum/engine-r ... -out-drive