hole in the back box / mk1 1.2 clio d7f

[Schakal]

failed emissions with a leak on the joint at the back box ,i have taken
the whole system out ,cleaned up and put it back together with zorst
assembly paste ,as soon as i start the engine up ,drops of water started
coming from behind the back box

thinking its a corrosion issue ,cleaned up the area to see a very neatly
drilled 3mm ish diameter hole , looks really like a factory jobbie
anyone know if its supposed to be the for water draining purposes ??
or do i just stick a screw of the suaitable diameter to fix it ???

[tobester]

'tis probably a standard hole mate, if it's uniform in shape then it sounds as though it was manufactured with it, my beemer exhaust has the same, drips water out like it's going out of fashion. Wouldn't worry about it to be honest.

[Schakal]

'tis probably a standard hole mate, if it's uniform in shape then it sounds as though it was manufactured with it, my beemer exhaust has the same, drips water out like it's going out of fashion. Wouldn't worry about it to be honest.

thanks for the confirmation
never seen them on a re-NO!! before .
all good

[gttjames]

it is to let moisture come out, as to not just rot in the back box, pick up any new backbox like a bosal one and you will see the hole from new

[paul b]

they do have drain holes,thats no problem....

but what did it fail the emmissions on.....????

was it Lambda or CO%.........???