THANKS GUYS FOR YOUR HELP , THE FRONT PULLY HELD BY 4 BOLTS , PUTTING IT WRONG WILL SET THE TIMING MIN.90 DEGREE OUT. BUT THE REAR CAMSHAFT GEAR IS PART OF IT , PREST OVER THE CAMSHAFT . I SUSPECT THIS GEARS HAS MOUVED OUT OF POSITION WITH THE IMPACT AND SET THE TIMING OUT ,IVE ORDERED THE CAMS FOR TOMORROW ,ITS ONLY £600 BUT I CANT SEE ANY OTHER OPTION . ILL LET YOU KNOW. ALI