<div dir="ltr">There is one mode of failure for a water pump that can cause sudden overheating. If the impeller either corrodes and falls apart or the impeller comes off the shaft, no water will circulate except by thermo-syphon. Neither of these are common, but they can happen.<div>Then of course there was the plastic impellers for MG water pumps that would get soft and fall off when the coolant got hot. </div><div>Rick</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Sep 7, 2016 at 1:40 PM, BJ8Healeys <span dir="ltr"><<a href="mailto:sbyers@ec.rr.com" target="_blank">sbyers@ec.rr.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#002060">Water pumps usually do not fail suddenly, but get noisy and leak out the weep hole in the bottom of the pump housing when they begin to fail. I would suspect the thermostat failed closed, preventing the coolant from reaching the radiator.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#002060"><u></u> <u></u></span></p><div><p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#002060">Steve Byers</span><span style="color:#002060"><u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#002060">HBJ8L/36666</span><span style="color:#002060"><u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#002060">BJ8 Registry</span><span style="color:#002060"><u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#002060">AHCA Delegate at Large</span><span style="color:#002060"><u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#002060">Havelock, NC </span><span style="color:#002060"><u></u><u></u></span></p><p class="MsoNormal"><span style="color:#002060"><u></u> <u></u></span></p></div><p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#002060"><u></u> <u></u></span></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Healeys [mailto:<a href="mailto:healeys-bounces@autox.team.net" target="_blank">healeys-bounces@autox.<wbr>team.net</a>] <b>On Behalf Of </b>Simon Lachlan<br><b>Sent:</b> Wednesday, September 07, 2016 12:20 PM<br><b>To:</b> 'Healey List'<br><b>Subject:</b> [Healeys] Overheating query<u></u><u></u></span></p></div></div><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><span lang="EN-GB">Hi,<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-GB">This isn’t the usual one ....”my car always runs hot; what’s the cure?” etc<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-GB">No, this is my very own original.....<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-GB">Background:-<u></u><u></u></span></p><p><u></u><span lang="EN-GB"><span>1)<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span lang="EN-GB">The car, MkII BT7, has never had overheating issues before today.<u></u><u></u></span></p><p><u></u><span lang="EN-GB"><span>2)<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span lang="EN-GB">It has a new, 12 month, modern design radiator.<u></u><u></u></span></p><p><u></u><span lang="EN-GB"><span>3)<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span lang="EN-GB">It has the correct type(original design) Smiths sleeved thermostat. (5 years old +/-).<u></u><u></u></span></p><p><u></u><span lang="EN-GB"><span>4)<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span lang="EN-GB">The waterpump was in the car when I bought the car +/- 25 yrs ago.<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-GB">Today’s symptoms:- <u></u><u></u></span></p><p><u></u><span lang="EN-GB"><span>1)<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span lang="EN-GB">I took it out to the pub today and, on returning, I noticed that there was HEAT and then that the gauge was off the scale.<u></u><u></u></span></p><p><u></u><span lang="EN-GB"><span>2)<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span lang="EN-GB">There was plenty of coolant in the rad and it didn’t seem overly hot.<u></u><u></u></span></p><p><u></u><span lang="EN-GB"><span>3)<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span lang="EN-GB">I didn’t have much time, but I got the impression that the rad was not blowing steam or making more of a “cooling-off noise” than usual.<u></u><u></u></span></p><p><u></u><span lang="EN-GB"><span>4)<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span lang="EN-GB">I also got the impression that the engine was hotter than the rad.<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-GB">Is this typical of a failed water pump?<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-GB">How can one differentiate between thermostat issues and waterpump issues?<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-GB"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-GB">Any ideas?<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-GB">Simon<u></u><u></u></span></p></div></div><br>______________________________<wbr>_________________<br>
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