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Thanks Phil,</div>
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I agree with what you're saying.</div>
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Just got off the phone with the machinist and he swears up and down that he checked the cylinders before and after boring/honing.</div>
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Still could be the cylinder and certainly could be the head.</div>
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Head looked flat to me with no local deformations, and combustion chambers looked clear, but my magniflux eyes may be failing.</div>
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I'll do some more snooping into coolant passages and water pump, and then take the head down for surfacing and crack checking.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Philip Gott <vfracing@aol.com><br>
<b>Sent:</b> Saturday, September 23, 2023 4:26 PM<br>
<b>To:</b> Anthony Parker <solarant@hotmail.com>; Friends Of Triumph <fot@autox.team.net><br>
<b>Subject:</b> Re: [Fot] Coolant conundrum</font>
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<div dir="ltr">Anthony:
<div>I realize you have a GT6, but it is behaving very much like my TR4 when I had a crack in a cylinder. It would hold pressure during a pressure test, and it even held a vacuum, yet it would push water out and replace it with “air” ( combustion gases) when
running. Assuming your head is ok, there could be a crack in a cylinder that the machine shop missed. Given the high pressures in the combustion chamber i would not think that that any sort of “stop leak” would work.</div>
<div>Let us know what you find out.</div>
<div>Phil </div>
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<div dir="ltr">Sent from my iPhone</div>
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<blockquote type="cite">On Sep 23, 2023, at 2:19 PM, Anthony Parker via Fot <fot@autox.team.net> wrote:<br>
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<span class="x_ContentPasted0" style="margin:0px">I'm having cooling problems.</span></div>
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Need help being convinced that I have to do what I don't want to do.</div>
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Brand new short block, same old head, water pump, and radiator.<br>
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<div class="x_ContentPasted0" style="margin:0px">Over three trials, the engine will run fine and warm up with radiator hoses and radiator warming properly. Then the hoses and radiator will cool and coolant temp will spike to 230+. Radiator cold with sky high
coolant temps.</div>
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<div class="x_ContentPasted0" style="margin:0px">Two more clues, hoses seem to pressurize very quickly and when I opened the radiator cap this morning (after cooling all night) pressurized air and coolant shot everywhere.</div>
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<div class="x_ContentPasted0" style="margin:0px"><span class="x_ContentPasted1" style="display:inline!important; background-color:rgb(255,255,255)">No thermostat and I have confirmed three times that system is completely full</span><br>
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<div class="x_ContentPasted0" style="margin:0px">Seems I have combustion gases getting into coolant and then bubbles eventually removing pump prime.</div>
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Don't know what else it could be.</div>
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Given the apparent direction of the leak, is there any use in trying some "stop leak" product?</div>
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Is it time to pull the head again to look for warping or gasket leak?</div>
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I suppose it could be a cracked cylinder, but this block has been checked by two different trusted engine machinists.</div>
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Desperately trying to get to the RunOffs, Anthony.</div>
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