Sorry for the bad pic. I noticed that the stud that the tach pickup uses is shiny and has what appear to be score marks on it. The tach works OK and I can't see anything obvious when it's running

I've heard about a recall on the balancers on the W116 300SD's (I think) so this is worrysome

Should I shut it down until I get the proper socket to check the balancer bolt?

The cutout to the left of the "stud" is also strange to me (Not where it was drilled for balancing, farther left in the pic.) Maybe the tach pickup vibrated out of position a little? I figure if it hit hard it would have damaged something.

The scrubbing looks like it's pretty recent.

Thanks.

__________________
My occupational hazard bein'
my occupation's just not around...
1980 300SD
1980 300SD