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Vauxhall Astra G Diesel - astra cdti oil pump pulley - t2myd

hi . ive had my cambelt snap ,upon strip down of the cam belt cover ,i noticed that the oil pump pulley as shatered into peices ,.ive googled the problem and it seems to be a common problem ,my question is what make the pulle shatter ,cam belt was done 12000 mile ago ?