Motor mount bolts

[jan lauwers]

Hello Folks,

While my engine is out I am taking the opportunity to replace the parts that are obviously worn out.... so I have bought new motor mounts. The right one was torn apart which is not uncommon from what I read here.
My supplier told me that the bolt that is sitting in the sub frame and going upwards, exists in 2 lengths and that I may have to shorten the ones that he gave me. From what I can tell at first sight, mine look a bit long indeed, I.e. 84mm, the head included. To show you want I am talking about, I add a pic and the drawing... it is the bolt nr 6. I don't want to make a mistake if I am going to shorten them. Does anybody know how long they should be?
Many thanks!!
Jan 

[ja17]

Hello Jan,

The bolts you have look incorrect.  Normally the bolts have a long shoulder and a short length of thread. The bolts you have look like the correct bolt for the rear motor mounts used on  the earlier Mercedes "ponton" sedans and the 190SLs.

[jan lauwers]

Thanks Joe... that sounds like shortening them is not going to be right. I ll try to find the correct ones.

Jan

[wwheeler]

Joe is right about the bolts. That flat washer is probably welded on to the bolt head. If so, it is a rear Ponton mount bolt. I just replaced the ones on my '60 220SE a couple of weeks ago. Those bolts are fully threaded for a reason.

[RonB]

You might want to check your sub frame mounts. Especially if they are original.

Enjoy when finished.