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                         trying to change the water pump on my vauxhall corsa 8v 1997.  while I was trying to undo the crank pulley the cambelt slipped and now I suspect that the timing is now out. Is there any marks or ways I can check to see if the timing is correct?? 
I now know I should have marked the pulleys but didnt realise that the cambelt would slip on the crank pulley. 
please help, thanks.. 
  
  
                            
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