I had a steering related 'thunk' on the driver side 88 560SL develop recently. Not a heavy metal thunk. Just occurred when turning the wheel and road bumps. Replacing tie rod cured it.
Ball joints clunk like that. He mentioned your driver's side upper 'blade' which he means control arm where the ball joint rests (you have lowers, too). When I replaced mine I found the price for a new arm better that the price of a new ball joint plus labor to replace, especially since it had new bushings already installed. Do both if you choose to replace.
560 upper control arm is a little different than previous 107 versions....the ball joint is NOT replaceable and the whole arm must be replaced...which last I heard...might still be unobtainable.
I don't have a 560SL so I don't really care?....but I'm sure someone, somewhere must have found a fix for this.
I remembered the blade reference: he said he'd keep a lookout for the windshield wiper blade for the driver's side (I was sold 2 right-hand blades via Ebay; grrr).
But yeah, the muffled clunk on the right-hand side is a bit worrying. New development. Mechanic keeps saying "it's an old car!" and yeah, it is. 29 years old, you're gonna have Issues.
?????...I don't think so. Mine are of equal length. To have the drivers side blade rest on the stainless windshield trim is normal on the 560SL if that is what you are referring to. Older MB's did have blades of unequal lengths.
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