Cast cover to Fuel injection rail

[sadam]

I have a reoccuring problem with my ladies 172 clio - the two studs that hold on the cast ali cover to the fuel injection rail keep shearing for no aparent reason.

I'm on the fifth set in 25000 miles.

Can anyone advise, since my local dealer can't help.

 

[Fred@BTM]

seems very strange, they do come loose occasionally, never heard of them shearing

 

[stan*]

over-tightened?

 

[sadam]

No I've not been overtightening them, they seem to either come loose and we loose the nut or the shear just above the head of the hex head to the stud.