oil leak help needed

hey

i tried to post this earlier on but for some reason it vanished . i have had my zs since Xmas so far i have had to change the clutch break discs calibers , two weeks ago the cam belt snap , so ended up having to replace 6 valves it had a new head gasket timing belt ect fitted , over the weekend i spotted a oil patch on my drive , i have manged to find where its coming from .I have spoted a crack round where an 8mm bolt is im not 100% sure where it screws into , its behind a pulley for the alternator . i have looked in the haynes manual and it looks like its part of the lower cam cover , I have pics but im not sure how i go about posting them , if anyone could give me help that would be great

thanks

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