[TR] Ideas, anyone?

[TERRY SMITH]

I've never heard of such a thing, but could the oil itself be the culprit?  Maybe a too thin variety got into a wrong bottle?  Or maybe just a bad batch?

> On May 13, 2020 at 7:34 AM andrew uprichard <auprichard at uprichard.net> wrote:
> 
> 
>     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).
> 
>      
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>     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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