[TR] Ideas, anyone?

[andrew uprichard]

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 at charter.net> 
Sent: Wednesday, May 13, 2020 5:58 AM
To: 'andrew uprichard' <auprichard at uprichard.net>; triumphs at 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 at autox.team.net] On Behalf Of andrew
uprichard
Sent: Tuesday, May 12, 2020 5:54 PM
To: triumphs at autox.team.net <mailto:triumphs at 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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