Hi I'm new to this forum and after a bit off advice , I have a XKR 5.0 supercharged 2010 and Jag service centre says crank pulley oil seal is leaking oil . Wanted £900 ish to fit a new oil seal . So I have brought the crank pulley remove tool , new bolt left hand thread and oil seal , As engine is chain driven does the crank need locking to remove pulley ? Is the crank sprockets on a key way ?