<div dir="auto">Hi Michael -</div><div dir="auto"><br></div><div dir="auto">I think he is talking about the threads in the head that the little feed nipple for the pipe screws to.</div><div dir="auto"><br></div><div dir="auto">Cheers,</div><div dir="auto"><br></div><div dir="auto">Alan</div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 24 Feb 2022 at 7:12 AM, Michael Salter via Healeys <<a href="mailto:healeys@autox.team.net">healeys@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">Rocker oil supply banjo bolt thread.<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Feb 11, 2022 at 4:42 PM Bob Haskell <<a href="mailto:rchaskell@earthlink.net" target="_blank">rchaskell@earthlink.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hank,<br>
<br>
I wonder, since it is an "oil line", could the threads be BSB - British <br>
Standard Brass? I realize that the screw is steel threading into <br>
aluminum, not brass. BSB is a 55 degree thread form. CEI/BSC is 60 <br>
degree.<br>
<br>
Various threads are described on British Tools and Fastener's web site: <br>
<a href="https://britishfasteners.com/threads-bsb" rel="noreferrer" target="_blank">https://britishfasteners.com/threads-bsb</a><br>
<br>
Cheers,<br>
<br>
Bob Haskell<br>
Austin Healey 3000 BN7/BT7 registrar<br>
<br>
On 2/11/22 4:26 PM, <a href="mailto:gradea1@charter.net" target="_blank">gradea1@charter.net</a> wrote:<br>
> Thanks to Curt for this accurate and informative article. I totally <br>
> agree that the early part numbers ie: 1B--- would designate British <br>
> fasteners, and the later three letter, three number designation <br>
> aligned the UNF hardware. That is our best clue to what was used back <br>
> then.<br>
><br>
> This early engine has stumped me on a number of occasions and I really <br>
> feel that for that first year anything goes to get the product to the <br>
> market...a real scramble. I have a notion that this engine was sitting <br>
> in stock as surplus A-90 leftovers. The block was factory painted dk. <br>
> blue. The head on this car was "Gold Seal" rebuilt. The threads I <br>
> discussed, are most definitely British Standard Cycle (CEI) 26 TPI.. <br>
> Many of the studs are BSF on one end and BSC on the other. Luckily, <br>
> these parts are available from British Tool & Fasteners, including a <br>
> full line of BSC hardware. Unfortunately they were out of 3/8 BSC <br>
> helicoils, so I had to get some from, you guessed it... Amazon. Big $$ <br>
> rather than Pence.<br>
><br>
> Yes, all this is another great unsolved mystery in Austin/BMC history. <br>
> But, what else would we have to discuss...covid? Regards, Hank<br>
><br>
> -----------------------------------------<br>
><br>
> From: "Curtis Arndt"<br>
> To: "Hank Leach"<br>
> Cc: "Michael Salter", "Healeys", "Bob Haskell", "Curtis Arndt"<br>
> Sent: Thursday February 10 2022 6:22:39PM<br>
> Subject: Re: [Healeys] 100 fasteners<br>
><br>
> Regarding the steel and strength ratings of British and other <br>
> fasteners, they were either _"Mild"_ Steel (British grades unmarked or <br>
> A, B, C or K for nuts with "B" being the most common after unmarked) <br>
> or _"High Tensile"_ steel (all other letter grades D-G [pre 1950] and <br>
> R-Y [post 1950]). The confusion appears in calling "_High Tensile <br>
> Steel_" - "High Speed Steel" as Michael has pointed out.<br>
><br>
> See my attached article...<br>
><br>
> Also with regard to fastener listings in the various parts manuals and <br>
> other BMC publications, if a fastener is noted with a "part number", <br>
> it is typically a Whitworth type thread form. When the changeover to <br>
> "Unified " fasteners occurred in the mid 1950s, all Unified fasteners <br>
> were noted with a new designation, describing in code the size of the <br>
> fastener. I would assume that all Unified fasteners fell under this <br>
> new coding system... But we know what happens when we assume.<br>
><br>
> BTW, this Unified fastener coding is published in a chart that most of <br>
> you should be familiar with by now.<br>
><br>
> For those unfamiliar, the "British Standards" define "Whitworth" as <br>
> all thread forms with a pitch angle of the threads measuring 55°, <br>
> e.g., BSW, BSF, BSPP, BSPT, BSB, etc... This is in contrast to Unified <br>
> (UNF/UNC), SAE and BSCy thread forms which have 60° pitch angle of the <br>
> threads. This is why British Standard Cycle are NOT a Whitworth thread <br>
> form despite the bolt heads using BSW/BSF spanners, and what is <br>
> erroneously published in Wikipedia... But I digress.<br>
><br>
> That being said, I would assume that part numbers (11B122 and 11B 298) <br>
> are both Whitworth fasteners since they are listed as part numbers. <br>
> Again, we all know what happens when we assume! Since these are <br>
> specialty fasteners, and not your run of the mill bolts, who knows how <br>
> BMC designated them? One may be BSF and the other UNF. Measure twice <br>
> or have a Helicoil kit on hand!<br>
><br>
> Cheers,<br>
><br>
> Curt<br>
><br>
> On Thu, Feb 10, 2022 at 4:23 PM Henry G Leach via Healeys <br>
> <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>> wrote:<br>
><br>
> I don't want to be a smart ass, here like Ralph found in<br>
> "Christmas Story", and stick my tongue to a light pole, but the<br>
> treads found on my rocker oil feed pipe are *HSS, 26TPI*. Here are<br>
> two measurements with a gauge showing the pattern. If it was 3/8<br>
> x24 UNF the job would be done. However, I had to order a special<br>
> $65 kit for the HSS Helicoils to repair this block.<br>
><br>
> Now, here are our 55 degree choices: *UNF 3/8 x 24*, BSW 3/8 x 16,<br>
> *BSF 3/8 x 20*, HSS 3/8 x26, BSC (old CEI) 3/8 x 26 as well, or<br>
> BSPF 3/8 x 19. Unless someone re-lathed this part it is factory<br>
> 26TPI for sure-ran a tap and die in both parts.<br>
><br>
> A note in the Sept. 1956 parts book refers to a service change<br>
> shown here. (Vol 25, p.13 engine) The BMC group is trying to<br>
> standardize this item. Accordingly, it appears to have been UNF<br>
> (11B122) on the 2.2 Diesel engine and then changed to BSF (11B<br>
> 298) at engine #225030. This engine I'm doing is from 1953 so who<br>
> knows what the correct part is?<br>
><br>
> In my March 1954 parts book the number for the "valve rocker<br>
> bracket with tapped hole" is 1B2110 and locating pin is 1B2111.<br>
> (no mention of TPI) That changed to 11B298 and 99.(BSF) in 1956.<br>
> Of course the later 6-cyl. engines used AEC162-probably unified,<br>
> but maybe still BSF.<br>
><br>
> If someone has the right answer, I will stick my tongue to a light<br>
> pole. Hank<br>
><br>
> -----------------------------------------<br>
><br>
> From: "Michael Salter"<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>
> The fasteners wouldn't be HSS ...that is used for machine tools<br>
> like drill bits and lathe tools.<br>
><br>
> M<br>
><br>
> On Wed, Feb 9, 2022 at 1:47 PM Bob Haskell via Healeys<br>
> <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>> wrote:<br>
><br>
> 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>
<br>
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