I had the same problem with the passenger side expansion tank on my '83
diesel.  There is an oval shaped ridge in the sheet metal that mates with a
protrusion of the same shape on the back side of the expansion tank.  Mine
was glued in place by undercoating.  Try prying the back side away from the
sheet metal.  The tank is sturdier than it looks.

Mike Snow

> I'm going to make a hole into the interior right next to where the
> expansion tank is. I just need to drop it and move it out of that
> way while
> I drill the hole. The manual shows only 1 nut holding it up and
> when that's
> off, I can't seem to wriggile it loose. Any expert ideas please.  Thanks
>
> Geoff
> Seattle