[Healeys] Today's Rant

David Nock healeydoc at gmail.com
Wed Apr 22 07:58:54 MDT 2020


All the threads on the 100/4 engine are BSF not Whitworth.  Whitworth is a coarse thread. 
However the wrench sizes are interchangeable. They are one size apart from each other. 

The threads on the small plate are 1/4 bsf and the gen bracket is 5/16 bsf. Also look close there are some of the studs that go thru into the cooling system. 

David Nock

Sent from my iPhone

> On Apr 21, 2020, at 10:18 PM, Michael MacLean <rrengineer.mike at att.net> wrote:
> 
> 
> So, I am getting ready to install the head on my 100 short block.  Made sure all the intake valves have the new seals I bought from British Car Specialists plus the new set of springs I already had for the valves.  The two mating surfaces were cleaned with a white (finest grit) Roloc brush.  I have the correct head gasket (copper faced).   Tonight was the night to torque the head down to the block.  My surprise, for some stupid reason I only ordered 8 new head nuts.  I managed to order the correct amount of washer for the head.  No idea what my pea brain was thinking.  Also found out the head nuts are Whitworth (3/8")  size.  I have a Whitworth socket set, so tragedy averted there.  I seem to remember someone talking about the water jacket blanking plate earlier this week.  That made me look at the front of my block.  Three studs and an empty hole.  No cover.  I managed to find two blanking covers in my stash of parts and a gasket in my gasket set.  Woohoo, but no nuts or lock washers.  Can someone tell me if these little nuts that I do not have are Whitworth nuts.  If so, what size?  I have a generator bracket, but there are no threaded studs for the block or nuts to mount it with.  Once again, Whitworth?  The closer I get to putting this together the more stuff I find out I don't have.
> Mike MacLean
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