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Re: [TR] Ideas, anyone?

To: "'andrew uprichard'" <auprichard@uprichard.net>, <triumphs@autox.team.net>
Subject: Re: [TR] Ideas, anyone?
From: "Alex & Janet Thomson" <aljlthomson@charter.net>
Date: Wed, 13 May 2020 05:57:50 -0400
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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>&nbsp;</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>&nbsp;</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>&nbsp;</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>&nbsp;</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 &#8211; 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>&nbsp;</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) &#8211; all perfect.&nbsp; I really didn&#8217;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>&nbsp;</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 &#8211; around 90 at 3000 =
rpm.&nbsp; 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>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Times New Roman","serif"'>I am running out of =
ideas here.&nbsp; Could it be a bad oil filter head?&nbsp; Anything =
else?<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Times New =
Roman","serif"'><o:p>&nbsp;</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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