If it's a real deep sounding rattle.. check the front pulley on the end of the crankshaft.. If this sucker is loose and is rocking on the key, it will make one serious rattle that will make you think you have a broken crankshaft... had it happen on an 8RC, a 70's early predecessor engine to the 22RE... <img border="0" title="" alt="[Frown]" src="images/icons/frown.gif" /> <img border="0" title="" alt="[Frown]" src="images/icons/frown.gif" />