I want to do a could of little things on my brothers "spare" car when
I go to visit him over christmas. I tried to find the haynes manual,
but www.haynes.co.uk does not list it and there are none on ebay. Is
anyone aware of a haynes or similar manual for the Mercedes 420 SEL
made in 1986?

The other thing that would help is if anyone could give me any pointer
as to how to:
A) Increase the richness if the mixture? I know it is one of the
screws on the carb, but IIRC there are quite a few and it is not
obvious. The mixture was turned down to get it through the emmisions
test, and now it is a bit slow apparently.
B) Fit the centre console, where the switches for the electric windows
and such like are. I do not think it will be that hard to do by trial
and error, but some pointers would be good.

 

first of all there is no carb on the vehicle. and the mixture screwis dead center of the insalled air cleaner. 5mm hex. out rich in lean

 

That is a fair bump. Thanks for the advice, but I ended up paying someone to do the mixture (the centre console was easy). I think it was worth it, he got the CO down by a factor of 5 and it runs much better now.