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Don't know for sure on TR4's but some engines source their oil pressure from the rear cam bearing, not the oil pump, mains or rod bearings. Where does the TR4 source it's oil pressure? If it comes from the rear cam bearing and if that clearance is excessive
it could result in a very low pressure at idle with hot oil. Oil pumps are volumetric flow pumps not necessarily pressure pumps, so you might be fine if the oil pressure gauge senses it's pressure indication from the rear cam bearing. Just a thought. </div>
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Randall Reihing</div>
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1959 TR3A </div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Triumphs <triumphs-bounces@autox.team.net> on behalf of andrew uprichard <auprichard@uprichard.net><br>
<b>Sent:</b> Wednesday, May 13, 2020 7:34 AM<br>
<b>To:</b> 'Alex & Janet Thomson' <aljlthomson@charter.net>; triumphs@autox.team.net <triumphs@autox.team.net><br>
<b>Subject:</b> [EXTERNAL] Re: [TR] Ideas, anyone?</font>
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<p class="x_MsoNormal"><span style="font-family:"Times New Roman",serif; color:#1F497D">Thanks for al the suggestions. Gauge is good, have tried a new oil pump. I think the next step is to plastigauge the bearings and check the rocker shaft, as suggested.
Then I guess the engine will have to come out. Sigh…..</span></p>
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<p class="x_MsoNormal"><b>From:</b> Alex & Janet Thomson <aljlthomson@charter.net>
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<b>Sent:</b> Wednesday, May 13, 2020 5:58 AM<br>
<b>To:</b> 'andrew uprichard' <auprichard@uprichard.net>; triumphs@autox.team.net<br>
<b>Subject:</b> RE: [TR] Ideas, anyone?</p>
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<p class="x_MsoNormal"><span style="font-size:12.0pt; color:#1F497D">Was the crankshaft cut down by a previous owner for use with undersize bearing shells? I saw this happen in a Nuffield tractor once. Great oil pressure at startup but diminishing quickly as
the oil thinned out.</span></p>
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<p class="x_MsoNormal"><span style="font-size:12.0pt; color:#1F497D">Alex Thomson</span></p>
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<p class="x_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"> Triumphs [<a href="mailto:triumphs-bounces@autox.team.net">mailto:triumphs-bounces@autox.team.net</a>]
<b>On Behalf Of </b>andrew uprichard<br>
<b>Sent:</b> Tuesday, May 12, 2020 5:54 PM<br>
<b>To:</b> <a href="mailto:triumphs@autox.team.net">triumphs@autox.team.net</a><br>
<b>Subject:</b> [TR] Ideas, anyone?</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Times New Roman",serif">Having (I think) sorted out the problem with the TR4, I took a recently-finished TR3B out for its second inaugural drive.</span></p>
<p class="x_MsoNormal"><span style="font-family:"Times New Roman",serif"> </span></p>
<p class="x_MsoNormal"><span style="font-family:"Times New Roman",serif">The first inaugural drive went pretty well, but once the engine temp came up, the oil pressure fell like a stone – and here we are talking around 40psi at 3000rpm and almost nothing at
(what was hot) idle. Adjusting the pressure with the screw on the oil filter head did nothing.</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Times New Roman",serif">I checked everything over, even pulled the oil pan and checked all the bearings (one main and 4 rods) – all perfect. I really didn’t find anything, and the specs on the oil pump looked
good, but I ordered a new pump as well as a new spring for the Purolator oil filter head (the valve itself is no longer obtainable).</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Times New Roman",serif">So today when I first took it out, the pressure was almost too high – around 90 at 3000 rpm. But as soon as the engine warmed up, it again dropped to scary levels. No leaks, no oil in
water or vice versa.</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Times New Roman",serif">I am running out of ideas here. Could it be a bad oil filter head? Anything else?</span></p>
<p class="x_MsoNormal"><span style="font-family:"Times New Roman",serif"> </span></p>
<p class="x_MsoNormal"><span style="font-family:"Times New Roman",serif">Andrew Uprichard</span></p>
<p class="x_MsoNormal"><span style="font-family:"Times New Roman",serif">Jackson, Michigan</span></p>
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