I believe it is the same as a std. 18mm sparkplug thread.

----- Original Message -----
From: Howard Fleming <hfleming@MOOSEBIRD.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, September 26, 1999 5:04 PM
Subject: tap size for the O2 sensor for a 85 Vanagon?

> Anybody have an idea of the size of the tap I would need to buy to
> clean up the O2 sensor port on the exhaust system?
>
> I am attempting to install a new sensor on the 85 Vanagon, and the
> threads are so badly messed up that I can not install the new unit.
>
> Thanks,
> Howard
> hfleming@moosebird.com
>
>
> hfleming@moosebird.com    Alexandria, VA   hfleming@moosebird.com
> 99 EuroVan MV - 97 Cabrio - 85 Vanagon - 84 Westy
> 84 Vanagon GL (spare parts that turned into a project)