evenin all,
we managed to get some progress done since the last post, the main
item being the attempt to change the roof. When originally setting out to
look for and M3 in the begining I had wanted one without a sunroof
but this proved all but impossible to find at the time so instead I settled for
a car with one.
So when planning this rebuild I decided that if so much work
was going to be done to the shell, changing the roof wouldn't add much more
effort, plus it'd get rid of a nice bit of weight to.
So after buying the roof skin from the local dealer, which is the same skin
as any other e30, we set about seeing what was involved in changing it.
From studying the parts diagrams it appeared that the rear roof addition
could be removed by drilling some spot welds to get access to the roof below
it.....
however when we started to clean around this panel to reveal the spot
welds that would have to be drilled we discovered that not only was the
panel a bit bigger than we had expected but it was also brazed in
places (i've outlined the panel in red to try and show a bit clearer what is
all one panel)........
and it continued all the way over to the other side.......
we hadn't minded the taughts of drilling out the spot welds around the
windscreen lip and the ones across the roof but in having to heat the panel
up to remove the braze and then removing the whole section across the
parcel shelf we were fairly sure we'd f**k the panel up,
which takes on a little more significance when your told the panel is no
longer available to buy. So instead we decided to do it like this.
first up cut out the lower section of the sunroof tray.....
which allows a good view of the brace that runs across the roof right
behind the sunroof opening. This had to stay, as cutting this out leaves
the roof very very flexible.
next up cut out the roof behind this brace......
which allows better access to carefully trim the metal off the brace.....
the sidewalls of the sunroof tray were still stuck to the brace and while
they at first glance look as if they are just bonded to it......
they are in fact spot welded to it.......
so drill the spot welds and carefully prise it free....
next up, the roof skin at the rear of the sunroof hole rolls in around
this brace.....
and the lip was buffed with the angle grinder untill the lip could be broken off without doing any damage to the brace. With everything now disconected underneath from the brace all that remained was to remove
the roof skin from above it. Two carefull cuts......
and then peal the skin off.....
revealing the roof brace....
with that done a few more carefull cuts were made to remove the side bits
of the roof skin.....
the reason why we needed to be carefull with the cuts was the roof
skeleton was only a few mm below the roof skin and we didn't want to
touch it.
with the skin cut down to the drain gutters on the side of the roof, these
were then buffed down with the angle grider to the flat mating surface,
ready for the new skin to sit on top (sorry lost the pic).
The last remaining piece of skin was the front section which involved
drilling out the spot welds around the windscreen lip and cutting it off....
the original roof is brazed on at the top of the front windscreen pillars
and this was removed by getting out the gas bottles and melting the braze
again to allow the last little bit of skin to be pulled off.....
after stopping for a brief smoke and a sh*te attack when the realisation
kicked in that I'd just cut a perfectly good roof off my M3 ,

we moved on swiftly.
remove the new roof from it's fancy crate.....
and then offer up the roof to see how it fits. As said earlier we had decided not
to remove the rear panel which concealed a couple of inches
of the roof skin and instead decided to cut and weld the roof here instead.
First up mark the roof to trim off the overhang....
and then refit the roof skin to see if we'd measured right.....
thankfully we did, and the roof sat nicely in place as we had left an inch
of the old skin protruding out and had joggled this down allowing the
new roof to sit on top of it......
next up was to trim the "A" pillar joins and get them sitting right.....
a couple of laps around the car buffing down metal to ensure the roof
was sitting snuggly before welding started......
and then we started welding at the rear first working our way forward,
after each weld was done it was quickly quenched with a wet rag to try
stop the heat from soaking into the roof skin and warping it.....
ideally it would have been nice to use a spot welder for this but we don't
have one and after pricing a decent one decided that it wasn't worth
buying one just for this job, so mig it is.....
the nice part about this run of welds is that theres a nice little brace
that sits on the roof which conceals everything.....
we then moved on to the sides, on the original roof the gutters appear to
be continously roll welded, I've no idea whats required to replicate this
and hassard a guess that the equipment required would cost the same if
not more than the spot welder, so, mig welder at the ready we ran a
bead of weld an inch long every few inches........
and buffed them down flush when finished so the black rail trim pieces
will fit back over.......
next up was drill and plug weld around the front windscreen lip.....
and finally braze up the "A" pillar joints.....
and hey presto, no sunroof.....
thank f**k thats done, not that we were ever nervous of making a balls
of it you understand
hope to tackle the rear arches next.