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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...
From: Alex & Janet Thomson <aljlthomson@charter.net>
Sent: Wednesday, May 13, 2020 5:58 AM
To: 'andrew uprichard' <auprichard@uprichard.net>; triumphs@autox.team.net
Subject: RE: [TR] Ideas, anyone?
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.
Alex Thomson
From: Triumphs [mailto:triumphs-bounces@autox.team.net] On Behalf Of andrew
uprichard
Sent: Tuesday, May 12, 2020 5:54 PM
Subject: [TR] Ideas, anyone?
Having (I think) sorted out the problem with the TR4, I took a
recently-finished TR3B out for its second inaugural drive.
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.
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).
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.
I am running out of ideas here. Could it be a bad oil filter head?
Anything else?
Andrew Uprichard
Jackson, Michigan
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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'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…..<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-family:"Times New =
Roman",serif;color:#1F497D'><o:p> </o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From:</b> Alex & Janet Thomson =
<aljlthomson@charter.net> <br><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?<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal><span =
style=3D'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.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;color:#1F497D'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;color:#1F497D'>Alex =
Thomson<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;color:#1F497D'><o:p> </o:p></span></p><div=
><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0in 0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif'>From:</span></=
b><span style=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif'> =
Triumphs [<a =
href=3D"mailto:triumphs-bounces@autox.team.net";>mailto:triumphs-bounces@a=
utox.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=3D"mailto:triumphs@autox.team.net";>triumphs@autox.team.net</a><br><b=
>Subject:</b> [TR] Ideas, anyone?<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal><span =
style=3D'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.<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-family:"Times New =
Roman",serif'><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'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.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Times New =
Roman",serif'><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'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).<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-family:"Times New =
Roman",serif'><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'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.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Times New =
Roman",serif'><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Times New Roman",serif'>I am running out of ideas =
here. Could it be a bad oil filter head? Anything =
else?<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Times New =
Roman",serif'><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Times New Roman",serif'>Andrew =
Uprichard<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Times New Roman",serif'>Jackson, =
Michigan<o:p></o:p></span></p></div></body></html>
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