Larry,
How tight is "tighten the daylights out of it"?
This is a serious question as I have had problems with my 84 500SEL since I replaced the idler bushings. I replaced them and every thing was fine for about a month and then a knocking noise came back on rough roads. I took it apart again ( just checking) and reassembled it and the noise was gone for about a month again. This happened one more time at which time I put locktight on the bolt and reassembled. Guess what, the noise is back.
Maybe I'm not getting the "daylight out of it".
Could you give me a rough torque figure for this bolt?
Thanks

__________________
84 500 SEL (307,xxx miles)