E21 316: Big job broke out - Time to do the N/S/R Wheel-Arch...

This is the first wheel-arch I pulled to fit the 16s and it's the only one now still needing a tidy-up, to say the least. I cut too much of the lip off trying to wedge some balloon-like 45% profile tyres and left it in a right mess. The newer 40% profile tyres fit perfectly and only needed minor cutting to the other arches, leaving this one miles from the rim and totally out of shape. The bit I cut off is the line used to form the arch on the rest, so this one was missing an edge to build the filler up to and totally sculpting the new arch-line by hand with hanging bits of mesh and filler was never going to happen. The easiest method would be a plastic arch cover, hiding the cut area completely and easily smoothed into the wing, but all four would have to match and the Group 2 ones are just too big to consider. It seems my only options are -

A. Buy a new pressed-steel wheel-arch from eBay for £25. Trim it, grind the wing away in the right shape, weld it in place, grind the welds down flat and smooth it all off. Only then could I pull the new arch-lip out and fill it to match the other three. [http://www.ebay.co.uk/itm/BMW-E21-316-323i-1977-1983-REAR-PASSENGER-SIDE-WHEEL-ARCH-NEW-CLEARANCE-PRICE-/190865619545?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2c707a3a59]

B. Spot-weld the piece I cut off back into place and secure it with fibre-glass filler. Fill the lip to match the others and build up and re-shape the arch up to where it meets the wing almost.

No doubt B involves a lot less time and effort, but it's still going to be a lot of rubbing down.

The chewed up scrap of metal, good job I saved it. It didn't just slot back into position, there was quite a bit of grinding and filing.

I had wanted to tack-weld the metal on and fill the gaps with fibre-glass, but I couldn't get hold of one so masking-tape did the job. I caked on plenty of P40 fibre-glass filler in between the tape, waited for it to go off, removed the tape and filled in the gaps.

Well sealed behind with more P40. You can see the sliver of metal in position as the light shines through, showing just how much arch got cut off originally.

It was then ground down with a rotary-file on the drill, mainly inside so nothing rubs on the tyre, but a bit to give the lip some shape. All that's left now is the arduous task of filling all that arch.

E21 316: (Wheel) Arch-Nemesis Beaten! - tidied up with a bit of flare.

Been enjoying the car and weather too much over summer to neaten up the pulled wheel-arches, but thought I'd take some time off to finish them before the rain and gloom sets back in.

I bent the lip with a pair of grips into the smoothest arch I could and filled it flush with P38 to where the original outer lip was. This took quite a bit of building up.

Normally I'd give it a coat of zinc-primer for now and rub it down again, but for aesthetic value I went straight to red-primer and it's already lifted the look of the car.

More of the rear arches had to be cut away than the front, so this meant a smaller and slightly easier area to fill. The only remaining arch is the dreaded N/S rear one, which I hacked to death trying to install tyres that were too big, but it's a mammoth job alone and will have to wait.

E21 316: Front wheels fitted - the easy part.

No fouling on the pulled arch-lip with these skinnier tyres, but the front valance was still just about catching so, with the arrival of the new spacers, I thought I'd get the fronts boxed off before starting the arduous task of the other rear arch. Sadly, my camber-plates have yet to arrive, I guess they must be stuck while Customs & Excise figure out what they are.

Thankfully, the amount of valance that needed cutting away on the n/s was only about 8mm and I didn't have to remove the bumper after all. I did my best to follow a natural curve, not sure if I took a little too much near the bottom. Interestingly, the o/s of the front valance didn't contact the new tyre at all and the fender does not extend past the bumper. I wonder if the n/s wing has been replaced at some point giving a slightly proud line. I matched up to that line when repairing the lower-valance last summer, so that would explain why it was catching the tyre too. Either way, the o/s/f arch required no grinding at all, so a little more pulling and the fronts will be ready for smoothing in.

I've also been driving round the last day or two with NASCAR style staggered wheels - 16s on the n/s and still 15s on the o/s. The car steers great to the right, but is a bit recalcitrant going hard left. I must find time to wrestle that other rear arch on Monday or it'll be like this for a while.