[Healeys] 100 fasteners

Thu Feb 10 17:17:11 MST 2022

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  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

 On 2/9/22 1:25 PM, Bob Spidell wrote:
 > What does ‘HSS’ stand for?
 >
 >
 >> On Feb 9, 2022, at 10:15 AM, gradea1 at charter.net wrote:
 >>
 >> Just had a 100 engine to repair the oil feed pipe fitting on
the
 >> rocker shaft 3rd block, and everyone might note that the thread
for
 >> the special bolt is *3/8" x 26 HSS*. Helicoils are available for
 >> those who have "buggered" the fitting. Be careful when replacing
this
 >> item on rebuild. Keep both ends loose until successfully threaded.

 >> The alloy rocker blocks are not easy to come by. Hank,
healeyhelper.
 >>
 >> -----------------------------------------
 >>
 >> From: "Curtis Arndt"
 >> To: "Bob Spidell"
 >> Cc: "Healeys"
 >> Sent: Tuesday February 8 2022 11:28:21PM
 >> Subject: Re: [Healeys] 100 Road draft (vent) pipe fasteners
 >>
 >> Bob,
 >>
 >> If it's on the engine it's Whirworth, 1/4" BSF to be specific in
the
 >> question you asked for #74.
 >>
 >> Cheers,
 >>
 >> Curt.
 >>
 >> On Tue, Feb 8, 2022 at 3:58 PM Bob Spidell  wrote:
 >>
 >> Anyone know off-hand what type of fasteners are used, Whitworth,
or ?
 >>
 >> Items# 72 & 76 in the Moss catalog page:
 >>  [1]https://mossmotors.com/external-engine-100-4 [2]
 >>
 >> TIA,
 >> Bob
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