Manifold Downpipe Nuts
Posted: Fri Feb 22, 2008 12:39 pm
What size/thread are they, i have tried loads out of my box of bits but none seem to have the right thread, is it maybe imperial??
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Re: Manifold Downpipe Nuts
Posted: Fri Feb 22, 2008 1:47 pm
They are m10 1.25 i think and they are not normal nuts but you can get them from BMW for about £0.25 each.
Re: Manifold Downpipe Nuts
Posted: Fri Feb 22, 2008 1:50 pm
Need to be copper or copper plated nuts if you want to get them undone again I think 
Re: Manifold Downpipe Nuts
Posted: Fri Feb 22, 2008 3:05 pm
would a slightly loose down pipe, ie on 3 not 4 nuts cause the car to idle roughly, like a missfire and stall?
Re: Manifold Downpipe Nuts
Posted: Fri Feb 22, 2008 3:23 pm
It can do if it's leaking gasses, the mm size of the originals are 14mm iirc.
Re: Manifold Downpipe Nuts
Posted: Fri Feb 22, 2008 6:47 pm
as above, i replaced mine with 15mm flange bolts.
Re: Manifold Downpipe Nuts
Posted: Mon Feb 25, 2008 12:44 pm
sorry for delayed reply, yea bmw have issued me with a 15mm saying its standard, so will try it in a bit 