[Healeys] Fwd: Hi Randy, I am stumped. michael.

[Curtis Arndt]

Michael,

As I understand your question...

The first problem is that the fasteners on 100s (BN1/2) engines are
Whitworth (55° thread pitch angle) BSF (British Standard Fine).  As such a
3/8" BSF fastener has 20 tpi.

A 3/8 X 24 tpi fastener is a standard UNF, ANF or SAE Fine thread,
basically a US Hardware store fastener, and is totally incompatible!  These
not only have a different tpi, but they are a 60° thread pitch angle.

-Curt

On Wed, Sep 11, 2019 at 1:59 PM Randy Hicks via Healeys <
healeys at autox.team.net> wrote:

> Received this from a friend. Can anyone help out?
>
> Randy
>
> Begin forwarded message:
>
> *From: *michael mc burney <mcb.1 at comcast.net>
> *Subject: **RE: Hi Randy, I am stumped. michael.*
> *Date: *September 11, 2019 at 4:54:14 PM EDT
> *To: *Randy Hicks <randyhicks at me.com>
>
>
>     Hello Randy, Hate to bother but I am stumped over a simple fastener
> problem. I am attempting to mount
>     my spare BN2 block onto a engine stand. Problem is with the four
> fasteners needed to do this. I have tried
>     all the bolts I think should work, but no! I thought the engine
> plate/xmission, bell housing used 3/8 by 24.
>     The cap screws will thread into the block but will not tighten. Do
> you/or one in the healey nation/ happen to
>     know the proper cap screw/bolt that will do the trick???
>
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