[TR] Ideas, anyone?

[Dave]

Have you compared to another gauge?  Maybe inline running the dash gauge too. 
I have heard that a badly worn front cam bearing can cause low oil pressure issues.  This bearing doesn't usually get replaced during a rebuild, even when the other cam bearings do, but they can get heavy wear. 
Dave H.

Sent from my iPad

> On May 12, 2020, at 2:54 PM, andrew uprichard <auprichard at uprichard.net> wrote:
> 
> 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
> ** triumphs at autox.team.net **
> 
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