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</o:shapelayout></xml><![endif]--></head><body lang=EN-NZ link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:EN-US'>Gentlemen,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:EN-US'>I had ongoing mild occasional overheating issues in my 3000 tri-carb for many years . . . until I fitted a <b>blanking sleeve</b> two years ago.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:EN-US'>Problem instantly solved. It’ll sometimes climb to 190 on a high-speed hill climb but, otherwise, rock steady where it should be.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:EN-US'>The sleeve is a stock BMC part. I got mine from a local Mini supply house here in NZ. The part number is <b>11G 176</b>.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:EN-US'>Moss sells them: 434-135. I know other suppliers do also.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:EN-US'>I fit it with a wax stat, which sits neatly on top.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:EN-US'>Mark<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:EN-US'>Ardmore<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:EN-US'>NZ<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><img width=376 height=376 style='width:3.9166in;height:3.9166in' id="Picture_x0020_1" src="cid:image002.jpg@01D844E2.56D6B940"></span><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US>From:</span></b><span lang=EN-US> Alan Seigrist <healey.nut@gmail.com> <br><b>Sent:</b> Wednesday, 30 March 2022 2:36 PM<br><b>To:</b> Harold Manifold <manifold@telus.net><br><b>Cc:</b> Michael Salter <michaelsalter@gmail.com>; Healey list <Healeys@autox.team.net><br><b>Subject:</b> Re: [Healeys] Coolant bypass port in the head - 6-cyl<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Harold -<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Thank you, now I understand how the whole thing is supposed to work. The sleeve works to cut off the bypass so that hot water is not recycled into the system after it warms up. FWIW, this only applies to the 6 cyl, the 4 cyl doesn't have any sort of bypass.<br><br>Yes, I think it would be great if you could share with us which thermostat to purchase and how to modify it.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Best,<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Alan<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Wed, Mar 30, 2022 at 1:28 AM Harold Manifold via Healeys <<a href="mailto:healeys@autox.team.net">healeys@autox.team.net</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>The coolant bypass plays an important but problematic role in the Healey’s cooling system. When the thermostat is closed coolant returns to the water pump via the bypass. See the red circle on the attached picture. The bypass is important for three reasons: its allows the coolant in the block to continue to circulate and come to a uniform temperature before the thermostat opens, it prevents hot spots that could develop from stagnant coolant and it prevents the water pump from dead heading.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>The problematic part is in the original design the bypass was closed by a sleeve on the bellows type thermostat when the thermostat opened. The original Bellows type thermostat used a volatile liquid and were not reliable and were not suitable for the 7 psi cooling system pressure. Wax type thermostats are much more reliable but they do not have a sleeve to close off the bypass. There may be some expensive wax type replicas of the original bellows type.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>After looking at many options the best option for a reasonably priced wax type thermostat with a sleeve to close off the bay pass is the modified Land Rover Series ll thermostat. If anyone would like to know about modifying the Landver thermostat let me know. It can be easily done.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>Harold<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <o:p></o:p></span></p><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span lang=EN-US>From: </span></b><span lang=EN-US><a href="mailto:healeys@autox.team.net" target="_blank">Michael Salter via Healeys</a><br><b>Sent: </b>Tuesday, March 29, 2022 9:17 AM<br><b>To: </b><a href="mailto:Healeys@autox.team.net" target="_blank">Healey list</a><br><b>Subject: </b>Re: [Healeys] Coolant bypass port in the head - 6-cyl<o:p></o:p></span></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <o:p></o:p></span></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>The coolant travels from the bottom of the radiator to the water pump into the block then from the block into the head then through the thermostat to the top of the radiator.<o:p></o:p></span></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>M<o:p></o:p></span></p></div></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <o:p></o:p></span></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>On Tue., Mar. 29, 2022, 11:57 a.m. Elton S, <<a href="mailto:eps2660@gmail.com" target="_blank">eps2660@gmail.com</a>> wrote:<o:p></o:p></span></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>As a related question, what is the direction of flow through the radiator - up from the bottom or down from the top?<o:p></o:p></span></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>Elton <o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>BJ7<o:p></o:p></span></p></div></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <o:p></o:p></span></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>On Tue, Mar 29, 2022 at 11:44 AM Michael Salter <<a href="mailto:michaelsalter@gmail.com" target="_blank">michaelsalter@gmail.com</a>> wrote:<o:p></o:p></span></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>As Gary points out, and far as I have been able to figure out, the bypass passage is open when the engine is cold, the idea being that by "short circuiting" the radiator the coolant in the heater and bypass passage will warm up more quickly and the heater will produce heat more quickly. <o:p></o:p></span></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>We had a slew of the "shrouded " type thermostats that I bought when Smiths Canada closed down. The part number was 43570/28 and we used to sell them to customers who reported overheating problems. <o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>I stopped promoting them as a potential solution to overheating issues after being taken to task by a customer who did an extensive study of the issue and proved, at least to my satisfaction, that they improved cooling not one iota.<o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>M<o:p></o:p></span></p></div></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <o:p></o:p></span></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>On Tue., Mar. 29, 2022, 10:47 a.m. Alan Seigrist, <<a href="mailto:healey.nut@gmail.com" target="_blank">healey.nut@gmail.com</a>> wrote:<o:p></o:p></span></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>I don't know if this has ever been answered before, but where does the little bypass port begin? <o:p></o:p></span></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>What parts of the head does that bypass come in contact with? <br><br>When do you want to cover the port with a sleeve (when coolant is hot or cold?)<o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>I ask because the old bellows style thermostat will cover the bypass port when the thermostat opens<br><br>then I have another wax thermostat and the sleeve actually cover the bypass when it is cold, and doesn't cover it when the thermostat opens.... so it works exact opposite to the old bellows style thermostat.<o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>confused....<br><br>Cheers,<o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>Alan<o:p></o:p></span></p></div></div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><span lang=EN-US>_______________________________________________<br>Support Team.Net <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br>Suggested annual donation $12.75<br><br>Archive: <a href="http://www.team.net/pipermail/healeys" target="_blank">http://www.team.net/pipermail/healeys</a> <a href="http://autox.team.net/archive/healeys" target="_blank">http://autox.team.net/archive/healeys</a><br><br><a href="mailto:Healeys@autox.team.net" target="_blank">Healeys@autox.team.net</a><br><a href="http://autox.team.net/mailman/listinfo/healeys" target="_blank">http://autox.team.net/mailman/listinfo/healeys</a><br><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/healeys/michaelsalter@gmail.com" target="_blank">http://autox.team.net/mailman/options/healeys/michaelsalter@gmail.com</a><o:p></o:p></span></p></blockquote></div></blockquote></div></blockquote></div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;margin-left:9.6pt'><span lang=EN-US>_______________________________________________<br>Support Team.Net <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br>Suggested annual donation $12.75<br><br>Archive: <a href="http://www.team.net/pipermail/healeys" target="_blank">http://www.team.net/pipermail/healeys</a> <a href="http://autox.team.net/archive/healeys" target="_blank">http://autox.team.net/archive/healeys</a><br><br><a href="mailto:Healeys@autox.team.net" target="_blank">Healeys@autox.team.net</a><br><a href="http://autox.team.net/mailman/listinfo/healeys" target="_blank">http://autox.team.net/mailman/listinfo/healeys</a><br><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/healeys/eps2660@gmail.com" target="_blank">http://autox.team.net/mailman/options/healeys/eps2660@gmail.com</a><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <o:p></o:p></span></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'>_______________________________________________<br>Support Team.Net <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br>Suggested annual donation $12.75<br><br>Archive: <a href="http://www.team.net/pipermail/healeys" target="_blank">http://www.team.net/pipermail/healeys</a> <a href="http://autox.team.net/archive/healeys" target="_blank">http://autox.team.net/archive/healeys</a><br><br><a href="mailto:Healeys@autox.team.net" target="_blank">Healeys@autox.team.net</a><br><a href="http://autox.team.net/mailman/listinfo/healeys" target="_blank">http://autox.team.net/mailman/listinfo/healeys</a><br><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/healeys/healey.nut@gmail.com" target="_blank">http://autox.team.net/mailman/options/healeys/healey.nut@gmail.com</a><o:p></o:p></p></blockquote></div></div></body></html>