A buddy of mine has an E430 with the part no. 112 035 09 00 (BTR 99M10) marked on the harmonic balancer wheel behind the serpentine belt drive that is on the outside diameter of the harmonic balancer. His car has a slight vibration at about 45 miles per hour and, based on this thread, I looked his harmonic balancer over throroughly. It has what appears to be a nearly continuous network of small cracks at the center of the rubber, which is worse in some places than others. I was wondering if this is the precursor to a failure, or is it perhaps the flashing from the mold? In any case, I advised him to have a the service manager where he gets it worked on take a look. Anyone know, though, if this is the beginning of the end? The car has about 102,000 miles and is a 2000 model. Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)