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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
To: triumphs@autox.team.net
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-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 [mailto:triumphs-bounces@autox.team.net] <b>On Behalf Of =
</b>andrew uprichard<br><b>Sent:</b> Tuesday, May 12, 2020 5:54 =
PM<br><b>To:</b> triumphs@autox.team.net<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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