<div dir="auto">When the US flirted with metrifying and production when to canada and mexico they made standard threaded bolts with metric heads so factories there could use metric tools<br><br><div data-smartmail="gmail_signature">Ira Erbs<br>Portland,OR<br>59 BN4<br>67MGB<br>65 AH Sprite<br>phone makes it's own choices. Forgive typos</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Apr 23, 2020, 6:17 PM WILLIAM B LAWRENCE <<a href="mailto:ynotink@msn.com">ynotink@msn.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>I think you have it backwards. The original GM design would have used the UNC thread pattern with a 9/16” bolt head. The design predated metrification in the US by a few decades. When Rover went metric, sometime in the 80s probably, they retained the US
standard thread pattern while changing to a metric standard bolt head. It would probably have been more costly to retool the engine castings to switch to a metric thread pattern.</div>
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<div>Bill Lawrence </div>
<div>BN1 #554</div>
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<div id="m_6037447791772944075divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> i erbs <<a href="mailto:eyera3000@gmail.com" target="_blank" rel="noreferrer">eyera3000@gmail.com</a>><br>
<b>Sent:</b> Thursday, April 23, 2020 7:13 PM<br>
<b>To:</b> WILLIAM B LAWRENCE <<a href="mailto:ynotink@msn.com" target="_blank" rel="noreferrer">ynotink@msn.com</a>><br>
<b>Cc:</b> <a href="mailto:simon.lachlan@alexarevel.plus.com" target="_blank" rel="noreferrer">simon.lachlan@alexarevel.plus.com</a> <<a href="mailto:simon.lachlan@alexarevel.plus.com" target="_blank" rel="noreferrer">simon.lachlan@alexarevel.plus.com</a>>; Patrick & Caroline Quinn <<a href="mailto:p_cquinn@tpg.com.au" target="_blank" rel="noreferrer">p_cquinn@tpg.com.au</a>>; Healeys <<a href="mailto:healeys@autox.team.net" target="_blank" rel="noreferrer">healeys@autox.team.net</a>><br>
<b>Subject:</b> Re: [Healeys] Today's Rant</font>
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<div dir="auto">Gm did that to rationalize tools as you say, but save money on not converting thread and pitch to metric. I had a 87 Olds with that exact situation. But also standards bolts heads too in some areas. <br>
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<div>Ira Erbs<br>
Portland,OR<br>
59 BN4<br>
67MGB<br>
65 AH Sprite<br>
phone makes it's own choices. Forgive typos</div>
</div>
<br>
<div>
<div dir="ltr">On Thu, Apr 23, 2020, 11:39 AM WILLIAM B LAWRENCE <<a href="mailto:ynotink@msn.com" target="_blank" rel="noreferrer">ynotink@msn.com</a>> wrote:<br>
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<div style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
In the midst of my recent Rover V8 rebuild I was surprised to discover that while all of the fasteners used metric wrench sizes many in the short block used the UNC thread type ie: a 3/8" coarse bolt with a 13 mm head. I assume that Rover simply continued the
UNC pattern of the original GM castings and changed the head size to simplify tool inventory.</div>
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<div style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
Bill Lawrence</div>
<div style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
BN1 #554</div>
<div id="m_6037447791772944075x_m_2173325284267159273appendonsend"></div>
<hr style="display:inline-block;width:98%">
<div id="m_6037447791772944075x_m_2173325284267159273divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Healeys <<a href="mailto:healeys-bounces@autox.team.net" rel="noreferrer noreferrer" target="_blank">healeys-bounces@autox.team.net</a>>
on behalf of <a href="mailto:simon.lachlan@alexarevel.plus.com" rel="noreferrer noreferrer" target="_blank">
simon.lachlan@alexarevel.plus.com</a> <<a href="mailto:simon.lachlan@alexarevel.plus.com" rel="noreferrer noreferrer" target="_blank">simon.lachlan@alexarevel.plus.com</a>><br>
<b>Sent:</b> Thursday, April 23, 2020 12:20 AM<br>
<b>To:</b> 'Patrick & Caroline Quinn' <<a href="mailto:p_cquinn@tpg.com.au" rel="noreferrer noreferrer" target="_blank">p_cquinn@tpg.com.au</a>><br>
<b>Cc:</b> 'Healeys' <<a href="mailto:healeys@autox.team.net" rel="noreferrer noreferrer" target="_blank">healeys@autox.team.net</a>><br>
<b>Subject:</b> Re: [Healeys] Today's Rant</font>
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<div lang="EN-GB">
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<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I have a vague memory of what we called “Transitional Rovers” ie a mix of Imperial and Metric. All
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">¾</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> tonner long wheel-base. All UK based. They may have been peculiar to the army.</span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Glad I wasn’t in REME…..they had to maintain them.</span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Simon</span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p>
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<div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Healeys <<a href="mailto:healeys-bounces@autox.team.net" rel="noreferrer noreferrer" target="_blank">healeys-bounces@autox.team.net</a>>
<b>On Behalf Of </b>Patrick & Caroline Quinn<br>
<b>Sent:</b> 23 April 2020 00:23<br>
<b>To:</b> 'David Nock' <<a href="mailto:healeydoc@gmail.com" rel="noreferrer noreferrer" target="_blank">healeydoc@gmail.com</a>>; 'Michael MacLean' <<a href="mailto:rrengineer.mike@att.net" rel="noreferrer noreferrer" target="_blank">rrengineer.mike@att.net</a>><br>
<b>Cc:</b> 'Healeys' <<a href="mailto:healeys@autox.team.net" rel="noreferrer noreferrer" target="_blank">healeys@autox.team.net</a>><br>
<b>Subject:</b> Re: [Healeys] Today's Rant</span></p>
</div>
</div>
<p> </p>
<p><span lang="EN-AU" style="font-size:11.0pt">G’day</span></p>
<p><span lang="EN-AU" style="font-size:11.0pt"> </span></p>
<p><span lang="EN-AU" style="font-size:11.0pt">Not long after I bought my first 100 back in 1972 I turned 21 and one of the birthday gifts I received was a set of BSF spanners and sockets. I still have them.</span></p>
<p><span lang="EN-AU" style="font-size:11.0pt"> </span></p>
<p><span lang="EN-AU" style="font-size:11.0pt">Now I have three sets of tools. BSF for the Healey Saloon. AF for the 100 BN3 and metric for the Hilux, Mercedes and around the house. There are many variations of each for specific purposes.</span></p>
<p><span lang="EN-AU" style="font-size:11.0pt"> </span></p>
<p><span lang="EN-AU" style="font-size:11.0pt">Hoo Roo</span></p>
<p><span lang="EN-AU" style="font-size:11.0pt"> </span></p>
<p><span lang="EN-AU" style="font-size:11.0pt">Patrick Quinn</span></p>
<p><span lang="EN-AU" style="font-size:11.0pt">Blue Mountains, Australia</span></p>
<p><span lang="EN-AU" style="font-size:11.0pt"> </span></p>
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<p><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> Healeys [<a href="mailto:healeys-bounces@autox.team.net" rel="noreferrer noreferrer" target="_blank">mailto:healeys-bounces@autox.team.net</a>]
<b>On Behalf Of </b>David Nock<br>
<b>Sent:</b> Wednesday, 22 April 2020 11:59 PM<br>
<b>To:</b> Michael MacLean<br>
<b>Cc:</b> Healeys<br>
<b>Subject:</b> Re: [Healeys] Today's Rant</span></p>
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</div>
<p><span lang="EN-AU"> </span></p>
<p><span lang="EN-AU">All the threads on the 100/4 engine are BSF not Whitworth. Whitworth is a coarse thread. </span></p>
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<p><span lang="EN-AU">However the wrench sizes are interchangeable. They are one size apart from each other. </span></p>
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<p><span lang="EN-AU"> </span></p>
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<p style="margin-bottom:12.0pt"><span lang="EN-AU">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. </span></p>
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<div>
<p><span lang="EN-AU">David Nock</span></p>
</div>
<div>
<p><span lang="EN-AU"> </span></p>
</div>
<p><span lang="EN-AU">Sent from my iPhone</span></p>
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<div>
<p style="margin-bottom:12.0pt"><span lang="EN-AU"> </span></p>
<p style="margin-bottom:12.0pt"><span lang="EN-AU">On Apr 21, 2020, at 10:18 PM, Michael MacLean <<a href="mailto:rrengineer.mike@att.net" rel="noreferrer noreferrer" target="_blank">rrengineer.mike@att.net</a>> wrote:</span></p>
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<p><span lang="EN-AU" style="font-family:"Tahoma",sans-serif"></span><span lang="EN-AU"></span></p>
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<p><span lang="EN-AU">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.</span></p>
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<div>
<p><span lang="EN-AU">Mike MacLean</span></p>
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