Engine npoise when cold

[forceyp]

I have a K12 Micra with 65000 miles - full service history. I have started to get a clicking sound sometimes when the engine is running cold. Its not always and goes when it get warms. Any suggestions. I have not had the tappets adjusted yet; could this be the problem. Engine runs well, no metal clonking or anything, just this audible clicking from the top end

 

[skymera]

Could be top timing chain? They always seem to rattle when cold


EDIT: K12 section doh

 

[frank]

k12,s dont have tappets as such, and the cam followers usually outlast the engine, the CR engines did have chain issues tho

 

[boy blue]

oil circulation may be poor at start and as a result the timing chain tensioner clashes against chain without the lube creating a harsh rattling noise