The shims go between both bolts, but only if needed. They're not meant to tip the starter. They add clearance between the gears when you run into a loud whine from the starter. Install any starter with no shims first and try it. If it whines, add one shim. If it still whines, add the second shim. I've never heard of needing three shims.
First try turning the engine a little by hand at the front vibration damper or by pulling on the belts. If the starter works, suspect a worn spot on the ring gear that the starter drive meshes with.
Thursday, September 15th, 2011 AT 7:06 AM