U need to use WD-40 or something like this. Dont use a hammer it may couse some trouble. I had the same problem with a V3 Skyline RB25DET turbo. My friend tryed to help me and thanks to his help the exhaust turbine weel had fallen off. I paid for this turbo 300 bucks waited almost 2 weeks to get it and never even had a chance to try it. I was so pised. It wass a second skyline turbo the first on fell apart at 1,6 bar of boost
