Dave, You may have to remove the muffler and cat converter to get at it
with sufficient wrench power.

I have had good success loosening up difficult things by soaking it in
Marvels Mystery Oil. Not the stuff  you put in the oil or gas, although
it may well be the same, but the real pure Marvels Mystery Oil. It is a
really good penetrating oil. Soak that puppy for two or three days and
then put the wrench to it. If that doesn't movr it, get some dry ice,
and wrap an old towel around the thing with the dry ice next to the cat
and the O2 sensor. Have your Bernzomatic torch handy as well as your
wrenches. Whe you know that metal is as cold as the dry ice, light the
torch, remove the ice and cover, and put the flame to the boss into
which the O2 sensor screws. Apply wrench pressure at the same time in a
loosening direction. The metal in the boss should expand more than the
metal in the O2 sensor, at least for a couple of minutes, and that
should give you sufficient time to get it broken free.

Good Luck.

John Rodgers
88 GL Driver

Dave Engstrom wrote:

>Thanks to all who identified the problem of my 87 Westy wet weather engine
>cut out.  All advice pointed to the o2 sensor. After close examination I found 2
>of 3 wires severed right at the oxygen sensor. Now any advice on getting the
>old o2 sensor out. It is like it is welded. I pulled one from a parts van no
>problem but can't get the sensor to move at all in the 87.
>
>Dave Engstrom
>
>
>