> Easy, once you've removed the plastic engine cover.
>
> Just don't take off more than one plug lead at a time, or you'll never
> work out how it all goes back together.
>

When you remove the bar that supports the coils packs, etc, the plug
leads all stay in place on a 156 so you can't get them wrong ... unless
you really go to town and completely remove all teh HT system from the
mounting bar .... (why??)

And don't worry when you see them wired up as
pack-plug-pack-plug-plug-pack-plug-pack ... they do go like that even
though it means the packs are on the larger plugs in cyl 1 & 2 and on
the smaller ones in cyl 3 & 4.