At first thanks for your answers. I´m trying to translate them. But I have a problem to understand "FITTING SLEEVE" and google translation was noch very usefull till now.
You should understand that when you fit a valve stem seal, you have to push it down past the notch in the valve stem where the half collects lock into, to hold the valve spring top retainer. Now this notch can have a sharp edge, and as you push the seal down over this, it can put minor cuts in the seal or damage it such that it will fail soon after.
In older times the valve stem seal was soft and easily damaged. So you always had a thin sleeve that you fitted over the end of the valve stem that went past this notch. You then oiled the seal and slid it down the sleeve which would protect it as it past the notch and kept it safe from damage. The sleeves are thin, reusable, and have to be the correct size for the valve stem, which in the case of the 2.2 engine (or any of the type 180 engines really) is 9mm diameter.
Today many valve stem seals are a stronger Nitrile type compound (often green or brown in colour) and providing the valve stem notch is not really bad, sharp and sticking out, with care you can fit the seal without a fitting sleeve and it won't be harmed, but as an older technician, I still prefer to use a fitting sleeve to protect the seals. The problem today is getting hold of such sleeves as few people use them, many have forgotten them, and younger mechanics have not even been taught about them!
The next problem is that there are still older type soft valve seals being provided and these usually have a white centre because the compound is PTFE or Teflon and if you fit these you MUST use a fitting sleeve. Unfortunately some of the gasket kits have these Teflon type valve seals, and they will be damaged when fitting without a sleeve.
I managed to get some sleeves recently, from America, so I can supply one of two if anyone requires one.
Roy