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Don't know for sure on TR4's but some engines source their oil pressure fro=
m 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 an=
d 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 pres=
sure pumps, so you might be fine if the oil pressure gauge senses it's pres=
sure indication from the rear cam bearing. Just a thought.
Randall Reihing
1959 TR3A
________________________________
From: Triumphs <triumphs-bounces@autox.team.net> on behalf of andrew uprich=
ard <auprichard@uprichard.net>
Sent: Wednesday, May 13, 2020 7:34 AM
To: 'Alex & Janet Thomson' <aljlthomson@charter.net>; triumphs@autox.team.n=
et <triumphs@autox.team.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=
=85..
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 bear=
ing shells? I saw this happen in a Nuffield tractor once. Great oil pressur=
e 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-fin=
ished TR3B out for its second inaugural drive.
The first inaugural drive went pretty well, but once the engine temp came u=
p, the oil pressure fell like a stone =96 and here we are talking around 40=
psi at 3000rpm and almost nothing at (what was hot) idle. Adjusting the pre=
ssure with the screw on the oil filter head did nothing.
I checked everything over, even pulled the oil pan and checked all the bear=
ings (one main and 4 rods) =96 all perfect. I really didn=92t find anythin=
g, and the specs on the oil pump looked good, but I ordered a new pump as w=
ell 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 =96 aro=
und 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? Anythi=
ng else?
Andrew Uprichard
Jackson, Michigan
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<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
Don't know for sure on TR4's but some engines source their oil pressure fro=
m 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 an=
d 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 ca=
m bearing. Just a thought. </div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
Randall Reihing</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
1959 TR3A </div>
<div id=3D"appendonsend"></div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Triumphs <triumphs=
-bounces@autox.team.net> on behalf of andrew uprichard <auprichard@up=
richard.net><br>
<b>Sent:</b> Wednesday, May 13, 2020 7:34 AM<br>
<b>To:</b> 'Alex & Janet Thomson' <aljlthomson@charter.net>; triu=
mphs@autox.team.net <triumphs@autox.team.net><br>
<b>Subject:</b> [EXTERNAL] Re: [TR] Ideas, anyone?</font>
<div> </div>
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<p class=3D"x_MsoNormal"><span style=3D"font-family:"Times New Roman&q=
uot;,serif; color:#1F497D">Thanks for al the suggestions. Gauge is go=
od, have tried a new oil pump. I think the next step is to plas=
tigauge the bearings and check the rocker shaft, as suggested.
Then I guess the engine will have to come out. Sigh=85..</span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Times New Roman&q=
uot;,serif; color:#1F497D"> </span></p>
<div>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"x_MsoNormal"><b>From:</b> Alex & Janet Thomson <aljlthom=
son@charter.net>
<br>
<b>Sent:</b> Wednesday, May 13, 2020 5:58 AM<br>
<b>To:</b> 'andrew uprichard' <auprichard@uprichard.net>; triumphs@au=
tox.team.net<br>
<b>Subject:</b> RE: [TR] Ideas, anyone?</p>
</div>
</div>
<p class=3D"x_MsoNormal"> </p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:12.0pt; color:#1F497D">Wa=
s the crankshaft cut down by a previous owner for use with undersize bearin=
g 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>
<p class=3D"x_MsoNormal"><span style=3D"font-size:12.0pt; color:#1F497D">&n=
bsp;</span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:12.0pt; color:#1F497D">Al=
ex Thomson</span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:12.0pt; color:#1F497D">&n=
bsp;</span></p>
<div>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"x_MsoNormal"><b><span style=3D"font-size:10.0pt; font-family:&q=
uot;Tahoma",sans-serif">From:</span></b><span style=3D"font-size:10.0p=
t; font-family:"Tahoma",sans-serif"> Triumphs [<a href=3D"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=3D"mailto:triumphs@autox.team.net";>triumphs@autox.team.n=
et</a><br>
<b>Subject:</b> [TR] Ideas, anyone?</span></p>
</div>
</div>
<p class=3D"x_MsoNormal"> </p>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Times New Roman&q=
uot;,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=3D"x_MsoNormal"><span style=3D"font-family:"Times New Roman&q=
uot;,serif"> </span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Times New Roman&q=
uot;,serif">The first inaugural drive went pretty well, but once the engine=
temp came up, the oil pressure fell like a stone =96 and here we are talki=
ng around 40psi at 3000rpm and almost nothing at
(what was hot) idle. Adjusting the pressure with the screw on the oil filt=
er head did nothing.</span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Times New Roman&q=
uot;,serif"> </span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Times New Roman&q=
uot;,serif">I checked everything over, even pulled the oil pan and checked =
all the bearings (one main and 4 rods) =96 all perfect. I really didn=
=92t 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 o=
il filter head (the valve itself is no longer obtainable).</span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Times New Roman&q=
uot;,serif"> </span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Times New Roman&q=
uot;,serif">So today when I first took it out, the pressure was almost too =
high =96 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>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Times New Roman&q=
uot;,serif"> </span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Times New Roman&q=
uot;,serif">I am running out of ideas here. Could it be a bad oil fil=
ter head? Anything else?</span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Times New Roman&q=
uot;,serif"> </span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Times New Roman&q=
uot;,serif">Andrew Uprichard</span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Times New Roman&q=
uot;,serif">Jackson, Michigan</span></p>
</div>
</div>
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