[Healeys] 100 fasteners
Alan Seigrist
healey.nut at gmail.com
Wed Feb 23 17:20:53 MST 2022
Hi Michael -
I think he is talking about the threads in the head that the little feed
nipple for the pipe screws to.
Cheers,
Alan
On Thu, 24 Feb 2022 at 7:12 AM, Michael Salter via Healeys <
healeys at autox.team.net> wrote:
> Rocker oil supply banjo bolt thread.
>
> On Fri, Feb 11, 2022 at 4:42 PM Bob Haskell <rchaskell at earthlink.net>
> wrote:
>
>> Hank,
>>
>> I wonder, since it is an "oil line", could the threads be BSB - British
>> Standard Brass? I realize that the screw is steel threading into
>> aluminum, not brass. BSB is a 55 degree thread form. CEI/BSC is 60
>> degree.
>>
>> Various threads are described on British Tools and Fastener's web site:
>> https://britishfasteners.com/threads-bsb
>>
>> Cheers,
>>
>> Bob Haskell
>> Austin Healey 3000 BN7/BT7 registrar
>>
>> On 2/11/22 4:26 PM, gradea1 at charter.net wrote:
>> > Thanks to Curt for this accurate and informative article. I totally
>> > agree that the early part numbers ie: 1B--- would designate British
>> > fasteners, and the later three letter, three number designation
>> > aligned the UNF hardware. That is our best clue to what was used back
>> > then.
>> >
>> > This early engine has stumped me on a number of occasions and I really
>> > feel that for that first year anything goes to get the product to the
>> > market...a real scramble. I have a notion that this engine was sitting
>> > in stock as surplus A-90 leftovers. The block was factory painted dk.
>> > blue. The head on this car was "Gold Seal" rebuilt. The threads I
>> > discussed, are most definitely British Standard Cycle (CEI) 26 TPI..
>> > Many of the studs are BSF on one end and BSC on the other. Luckily,
>> > these parts are available from British Tool & Fasteners, including a
>> > full line of BSC hardware. Unfortunately they were out of 3/8 BSC
>> > helicoils, so I had to get some from, you guessed it... Amazon. Big $$
>> > rather than Pence.
>> >
>> > Yes, all this is another great unsolved mystery in Austin/BMC history.
>> > But, what else would we have to discuss...covid? Regards, Hank
>> >
>> > -----------------------------------------
>> >
>> > From: "Curtis Arndt"
>> > To: "Hank Leach"
>> > Cc: "Michael Salter", "Healeys", "Bob Haskell", "Curtis Arndt"
>> > Sent: Thursday February 10 2022 6:22:39PM
>> > Subject: Re: [Healeys] 100 fasteners
>> >
>> > Regarding the steel and strength ratings of British and other
>> > fasteners, they were either _"Mild"_ Steel (British grades unmarked or
>> > A, B, C or K for nuts with "B" being the most common after unmarked)
>> > or _"High Tensile"_ steel (all other letter grades D-G [pre 1950] and
>> > R-Y [post 1950]). The confusion appears in calling "_High Tensile
>> > Steel_" - "High Speed Steel" as Michael has pointed out.
>> >
>> > See my attached article...
>> >
>> > Also with regard to fastener listings in the various parts manuals and
>> > other BMC publications, if a fastener is noted with a "part number",
>> > it is typically a Whitworth type thread form. When the changeover to
>> > "Unified " fasteners occurred in the mid 1950s, all Unified fasteners
>> > were noted with a new designation, describing in code the size of the
>> > fastener. I would assume that all Unified fasteners fell under this
>> > new coding system... But we know what happens when we assume.
>> >
>> > BTW, this Unified fastener coding is published in a chart that most of
>> > you should be familiar with by now.
>> >
>> > For those unfamiliar, the "British Standards" define "Whitworth" as
>> > all thread forms with a pitch angle of the threads measuring 55°,
>> > e.g., BSW, BSF, BSPP, BSPT, BSB, etc... This is in contrast to Unified
>> > (UNF/UNC), SAE and BSCy thread forms which have 60° pitch angle of the
>> > threads. This is why British Standard Cycle are NOT a Whitworth thread
>> > form despite the bolt heads using BSW/BSF spanners, and what is
>> > erroneously published in Wikipedia... But I digress.
>> >
>> > That being said, I would assume that part numbers (11B122 and 11B 298)
>> > are both Whitworth fasteners since they are listed as part numbers.
>> > Again, we all know what happens when we assume! Since these are
>> > specialty fasteners, and not your run of the mill bolts, who knows how
>> > BMC designated them? One may be BSF and the other UNF. Measure twice
>> > or have a Helicoil kit on hand!
>> >
>> > Cheers,
>> >
>> > Curt
>> >
>> > On Thu, Feb 10, 2022 at 4:23 PM Henry G Leach via Healeys
>> > <healeys at autox.team.net> wrote:
>> >
>> > 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 *HSS, 26TPI*. 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.
>> >
>> > Now, here are our 55 degree choices: *UNF 3/8 x 24*, BSW 3/8 x 16,
>> > *BSF 3/8 x 20*, 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.
>> >
>> > 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?
>> >
>> > 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.
>> >
>> > If someone has the right answer, I will stick my tongue to a light
>> > pole. Hank
>> >
>> > -----------------------------------------
>> >
>> > From: "Michael Salter"
>> > To: "Bob Haskell"
>> > Cc: "Bob Spidell", "Hank Leach", "Healeys"
>> > Sent: Wednesday February 9 2022 10:52:51AM
>> > Subject: Re: [Healeys] 100 Road draft (vent) pipe fasteners
>> >
>> > The fasteners wouldn't be HSS ...that is used for machine tools
>> > like drill bits and lathe tools.
>> >
>> > M
>> >
>> > On Wed, Feb 9, 2022 at 1:47 PM Bob Haskell via Healeys
>> > <healeys at autox.team.net> wrote:
>> >
>> > Bob,
>> >
>> > HSS - high speed steel.
>> > I think the threads are 3/8"-26 BSF (British Standard Fine).
>> >
>> > Cheers,
>> >
>> > Bob Haskell
>> > Austin Healey 3000 BN7/BT7 registrar
>> >
>>
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