on May 18, 2017, 3:19 pm, in reply to "Citroen C4 Aircross 2013 - Valve clearances #"
Looks like it's screws / lock nut etc
UKAT Workshop Data does not give specific info (only clearances), but on the service schedule it looks as if they need adjusting every 30,000 miles, it gives an additional time of 2.2 hours for checking / adjusting 
Peter
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Citroen C4 Aircross 2013 - Valve clearances # - Job Gevers May 17, 2017, 11:55 am
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