<html><body>I don't want to be a smart ass, here like Ralph found in "Christmas Story", and stick my tongue to a light pole, but the treads found on my rocker oil feed pipe are <b>HSS, 26TPI</b>. Here are two measurements with a gauge showing the pattern. If it was 3/8 x24 UNF the job would be done. However, I had to order a special $65 kit for the HSS Helicoils to repair this block.<div><br></div><div>Now, here are our 55 degree choices: <b>UNF 3/8 x 24</b>, BSW 3/8 x 16, <b>BSF 3/8 x 20</b>, HSS 3/8 x26, BSC (old CEI) 3/8 x 26 as well, or BSPF 3/8 x 19. Unless someone re-lathed this part it is factory 26TPI for sure-ran a tap and die in both parts.</div><div><br></div><div>A note in the Sept. 1956 parts book refers to a service change shown here. (Vol 25, p.13 engine) The BMC group is trying to standardize this item. Accordingly, it appears to have been UNF (11B122) on the 2.2 Diesel engine and then changed to BSF (11B 298) at engine #225030. This engine I'm doing is from 1953 so who knows what the correct part is?</div><div><br></div><div>In my March 1954 parts book the number for the "valve rocker bracket with tapped hole" is 1B2110 and locating pin is 1B2111. (no mention of TPI) That changed to 11B298 and 99.(BSF) in 1956. Of course the later 6-cyl. engines used AEC162-probably unified, but maybe still BSF.</div><div><br></div><div>If someone has the right answer, I will stick my tongue to a light pole. Hank</div><div><br><div class="reply-new-signature"></div><p>-----------------------------------------</p>From: "Michael Salter" <michaelsalter@gmail.com><br>To: "Bob Haskell"<br>Cc: "Bob Spidell", "Hank Leach", "Healeys"<br>Sent: Wednesday February 9 2022 10:52:51AM<br>Subject: Re: [Healeys] 100 Road draft (vent) pipe fasteners<br><br>
<div dir="ltr">
<div class="gmail_default" style="font-family:arial, sans-serif;font-size:small;">The fasteners
wouldn't be HSS ...that is used for machine tools like drill bits
and lathe tools.</div>
<div class="gmail_default" style="font-family:arial, sans-serif;font-size:small;"><br></div>
<div class="gmail_default" style="font-family:arial, sans-serif;font-size:small;">M<br></div>
</div>
<br><div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Feb 9, 2022 at 1:47 PM
Bob Haskell via Healeys <<a>healeys@autox.team.net</a>>
wrote:<br></div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px .8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
Bob,<br><br>
HSS - high speed steel.<br>
I think the threads are 3/8"-26 BSF (British Standard Fine).<br><br>
Cheers,<br><br>
Bob Haskell<br>
Austin Healey 3000 BN7/BT7 registrar<br><br>
On 2/9/22 1:25 PM, Bob Spidell wrote:<br>
> What does ‘HSS’ stand for?<br>
><br>
><br>
>> On Feb 9, 2022, at 10:15 AM, <a>gradea1@charter.net</a> wrote:<br>
>><br>
>> Just had a 100 engine to repair the oil feed pipe fitting
on the<br>
>> rocker shaft 3rd block, and everyone might note that the
thread for<br>
>> the special bolt is *3/8" x 26 HSS*. Helicoils are
available for<br>
>> those who have "buggered" the fitting. Be careful when
replacing this<br>
>> item on rebuild. Keep both ends loose until successfully
threaded. <br>
>> The alloy rocker blocks are not easy to come by. Hank,
healeyhelper.<br>
>><br>
>> -----------------------------------------<br>
>><br>
>> From: "Curtis Arndt"<br>
>> To: "Bob Spidell"<br>
>> Cc: "Healeys"<br>
>> Sent: Tuesday February 8 2022 11:28:21PM<br>
>> Subject: Re: [Healeys] 100 Road draft (vent) pipe
fasteners<br>
>><br>
>> Bob,<br>
>><br>
>> If it's on the engine it's Whirworth, 1/4" BSF to be
specific in the<br>
>> question you asked for #74.<br>
>><br>
>> Cheers,<br>
>><br>
>> Curt.<br>
>><br>
>> On Tue, Feb 8, 2022 at 3:58 PM Bob Spidell <<a>bspidell@comcast.net</a>> wrote:<br>
>><br>
>> Anyone know off-hand what type of
fasteners are used, Whitworth, or ?<br>
>><br>
>> Items# 72 & 76 in the Moss catalog
page:<br>
>> <a href="https://mossmotors.com/external-engine-100-4"></a><a href="https://mossmotors.com/external-engine-100-4">https://mossmotors.com/external-engine-100-4</a><br>
>><br>
>> TIA,<br>
>> Bob<br>
>>
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