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Curtis Arndt cnaarndt at gmail.com
Thu Jan 9 14:57:28 MST 2014


Bob & Stephen,

The wrench size is 9/16" W (Whitworth) which is also a listed as a 5/8" BSF
(British Standard Fine).  A far as the threads go, they should be a
Whitworth Thread Form, possibly BSP (British Standard Pipe). I haven't been
able to check the threads per inch, but others have stated they're a 3/4"
and 14 tpi which corresponds to BSP (Parallel).  This was measured and
confirmed on my NOS 100 oil pan.

However you're not going to find this size nut at any hardware store, it's
a special fastener and you'll have to find a used one, or have one cu$tom
machined, unless of course one of the AH suppliers has them.

Remember my warning about using 60 degree thread forms in a 55 degree
Whitworth applications, lest you want to be known as a future (HFDPO) Ham
Fisted Dreaded Previous Owner

I'd be interested in what Moss has to say.

Cheers,

Curt


On Thu, Jan 9, 2014 at 1:24 PM, Bob Haskell <rchaskell at earthlink.net> wrote:

> Well, I measured another oil pan plug (drained some oil too).  Same
> threads: 3/4"-14 TPI. I've sent an email to Moss to see what theirs are.
>  I've not found a British thread standard that includes it (BSW, BSF or
> BSP).  In metric terms, it might be 19mm - 1.8, but didn't find that
> either.  There's 3/4-14 UNS, but then you get into the 55 versus 60 degree
> issue.
>
> Cheers,
>
> Bob Haskell
> AHCA 3000 Mk I registrar
> http://www.ciahc.org/registry_3000mk1.php
>
> On 01/08/2014 07:10 PM, Larry Wendland wrote:
>
>> Were is everybody?  I've had no emails since Randy "Hicks Bring A
>> Trailer" email at 11:28 am EST this morning?
>>
>> Larry
>> '67 BJ8
>> Sent 7:10 pm EST
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