[Healeys] 100 fasteners

Wed Feb 23 16:10:24 MST 2022

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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