Hello fellow Benz enthusiasts, I'm new to your forums! I'm in the process of chasing down the infamous M103 oil consumption problem with my 1991 300SEL. I'm having difficulty finding specific specifications for valve guide to stem clearance (new or at wear limits).
Secondly, has anyone here had experience with driving the guides out and installing new ones? Did you use a air hammer or did you do it by hand? Was there any noticeable change in ID of the new guide when it was installed to the point that it needed to be reamed open?
Motor has 140,000 miles on it with good compression (176 to 184 PSI). Figuring it could be a result of a leaking head gasket or valve stem seal failure. I'd like to clear this potential cause off my list while I have the head off.

Thank you for your help!