140 Self-help, vehicle careChanging wheelsSome versions have tyre repair aerosolinstead of a spare wheel – see page 144.To ensure y our safety , ma ke the followingpreparations and observ e the followinginform ation w hen changing wheels:z Park the v ehicle on a level, firm a ndnon-skid surface.z Close Retra ctable steel roof – seepage 38.z Switch on the haza rd warning flashers,apply the hand brak e, engage first gearor reverse.z Correctly set up the w arning triangle.Warning triangle – see page 137.z Remove spare wheel 3 from luggag ecom partment – see page 138.z Before raising the v ehicle, set the frontwheels to the straight-ahead position.z Nev er change more than one wheelat onc e.z Block the wheel diagonally op posite thewheel to be changed by placing wedgeblocks or equiv alent in front a nd behindthe wheel.z Use the jack 3 only to change wheels.z If the ground on which the vehicle isstanding is soft, a solid board (max. 1 cmthick) should be p laced under the ja ck 3.Using a thicker b oard c ould dam age thejack and the v ehicle.z No people or animals may be in thevehicle when it is jacked up.z Never crawl under a jacked-up vehic le.z Do not start or run the engine while thevehicle is on the jac k.z Before inserting the wheel bolts whenchanging wheels, lightly grease the coneof ea ch b olt. For this reason, c arry som econventional grease.1. Remov e wheel c ov er with hook 3 .Tool k it – see pag e 139.If the wheel trim ha s v isible wheelbolts 3, the trim can rem ain on thewheel. The retaining washers 3 onthe wheel bolts must not be removed.