Sure did! I have a b234f 16 valve engine and at 147k with my daughter(17y/o) driving it (just before the timing belt change) the harmonic balancer wobbled enough to have the alternator belt come off beat the crap out of the lower timing cover on a three lane highway in the speed lane. A small piece of the cover traveled between the timing belt and the crank sprocket and yes, cylinder #3and#4 had bent valves. Not only could my daughter have been hurt, but $2,500 dollars later the car is fine.I strongly reccomend that everyone especially thoes with the b234f engine change the harmonic balancer at every other timing belt change . You can bet I will! joes 1990 740gle 148k