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If you spin an oil pump with a long screwdriver bit on a drill, you will get
oil pressure, but no feed to the head, which makes me think the rear cam
bearing is just responsible for the latter. But I could be wrong.
Andrew Uprichard
Jackson, Michigan
From: Reihing, Randall S. <Randall.Reihing@utoledo.edu>
Sent: Friday, May 15, 2020 10:08 PM
To: andrew uprichard <auprichard@uprichard.net>; 'Alex & Janet Thomson'
<aljlthomson@charter.net>; triumphs@autox.team.net
Subject: Re: [EXTERNAL] Re: [TR] Ideas, anyone?
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.
Randall Reihing
1959 TR3A
_____
From: Triumphs <triumphs-bounces@autox.team.net
Sent: Wednesday, May 13, 2020 7:34 AM
To: 'Alex & Janet Thomson' <aljlthomson@charter.net
Subject: [EXTERNAL] Re: [TR] Ideas, anyone?
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
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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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-family:"Times New Roman",serif;color:#1F497D'>If you spin =
an oil pump with a long screwdriver bit on a drill, you will get oil =
pressure, but no feed to the head, which makes me think the rear cam =
bearing is just responsible for the latter. But I could be wrong. =
<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><p =
class=3DMsoNormal><span style=3D'font-family:"Times New =
Roman",serif;color:#1F497D'>Andrew Uprichard<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-family:"Times New =
Roman",serif;color:#1F497D'>Jackson, Michigan<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> Reihing, Randall S. =
<Randall.Reihing@utoledo.edu> <br><b>Sent:</b> Friday, May 15, =
2020 10:08 PM<br><b>To:</b> andrew uprichard =
<auprichard@uprichard.net>; 'Alex & Janet Thomson' =
<aljlthomson@charter.net>; =
triumphs@autox.team.net<br><b>Subject:</b> Re: [EXTERNAL] Re: [TR] =
Ideas, anyone?<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;color:black'>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. <o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;color:black'><o:p> </o:p></span></p></div>=
<div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;color:black'>Randall =
Reihing<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;color:black'>1959 =
TR3A <o:p></o:p></span></p></div><div class=3DMsoNormal =
align=3Dcenter style=3D'text-align:center'><hr size=3D2 width=3D"98%" =
align=3Dcenter></div><div id=3DdivRplyFwdMsg><p =
class=3DMsoNormal><b><span style=3D'color:black'>From:</span></b><span =
style=3D'color:black'> Triumphs <<a =
href=3D"mailto:triumphs-bounces@autox.team.net";>triumphs-bounces@autox.te=
am.net</a>> on behalf of andrew uprichard <<a =
href=3D"mailto:auprichard@uprichard.net";>auprichard@uprichard.net</a>>=
<br><b>Sent:</b> Wednesday, May 13, 2020 7:34 AM<br><b>To:</b> 'Alex =
& Janet Thomson' <<a =
href=3D"mailto:aljlthomson@charter.net";>aljlthomson@charter.net</a>>; =
<a href=3D"mailto:triumphs@autox.team.net";>triumphs@autox.team.net</a> =
<<a =
href=3D"mailto:triumphs@autox.team.net";>triumphs@autox.team.net</a>><b=
r><b>Subject:</b> [EXTERNAL] Re: [TR] Ideas, anyone?</span> =
<o:p></o:p></p><div><p =
class=3DMsoNormal> <o:p></o:p></p></div></div><div><div><p =
class=3Dxmsonormal><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…..</span><o:p></o:p></p><p class=3Dxmsonormal><span =
style=3D'font-family:"Times New =
Roman",serif;color:#1F497D'> </span><o:p></o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3Dxmsonormal><b>From:</b> Alex & Janet Thomson =
<<a =
href=3D"mailto:aljlthomson@charter.net";>aljlthomson@charter.net</a>> =
<br><b>Sent:</b> Wednesday, May 13, 2020 5:58 AM<br><b>To:</b> 'andrew =
uprichard' <<a =
href=3D"mailto:auprichard@uprichard.net";>auprichard@uprichard.net</a>>=
; <a =
href=3D"mailto:triumphs@autox.team.net";>triumphs@autox.team.net</a><br><b=
>Subject:</b> RE: [TR] Ideas, anyone?<o:p></o:p></p></div></div><p =
class=3Dxmsonormal> <o:p></o:p></p><p class=3Dxmsonormal><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.</span><o:p></o:p></p><p =
class=3Dxmsonormal><span =
style=3D'font-size:12.0pt;color:#1F497D'> </span><o:p></o:p></p><p =
class=3Dxmsonormal><span style=3D'font-size:12.0pt;color:#1F497D'>Alex =
Thomson</span><o:p></o:p></p><p class=3Dxmsonormal><span =
style=3D'font-size:12.0pt;color:#1F497D'> </span><o:p></o:p></p><div=
><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0in 0in 0in'><p class=3Dxmsonormal><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?</span><o:p></o:p></p></div></div><p =
class=3Dxmsonormal> <o:p></o:p></p><p class=3Dxmsonormal><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.</span><o:p></o:p></p><p =
class=3Dxmsonormal><span style=3D'font-family:"Times New =
Roman",serif'> </span><o:p></o:p></p><p class=3Dxmsonormal><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.</span><o:p></o:p></p><p class=3Dxmsonormal><span =
style=3D'font-family:"Times New =
Roman",serif'> </span><o:p></o:p></p><p class=3Dxmsonormal><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).</span><o:p></o:p></p><p =
class=3Dxmsonormal><span style=3D'font-family:"Times New =
Roman",serif'> </span><o:p></o:p></p><p class=3Dxmsonormal><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.</span><o:p></o:p></p><p class=3Dxmsonormal><span =
style=3D'font-family:"Times New =
Roman",serif'> </span><o:p></o:p></p><p class=3Dxmsonormal><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?</span><o:p></o:p></p><p class=3Dxmsonormal><span =
style=3D'font-family:"Times New =
Roman",serif'> </span><o:p></o:p></p><p class=3Dxmsonormal><span =
style=3D'font-family:"Times New Roman",serif'>Andrew =
Uprichard</span><o:p></o:p></p><p class=3Dxmsonormal><span =
style=3D'font-family:"Times New Roman",serif'>Jackson, =
Michigan</span><o:p></o:p></p></div></div></div></body></html>
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