Here's what I know from personal experience and reading....I know, the
mind's the first to go.
I had a 63TR3 in 1963(so it had the "4" motor) and when cold the oil
pressure (OP) would reach 70 on the way to cruising (60-65mph) on the
highway and drop to 50. After a while on the road and everything got to
operating temperatures, the OP would jump up to 70 and stay there. If you
are really running 90, that seems to high. There is a bypass valve I
believe that can be adjusted at the filter base to prevent the oil pressure
from becoming to high. I'd check the pressure gage before I'd mess with
adjusting the valve. I belive the pressure is to reach a max of 70.......
>X-Persona: <tr3run>
>Return-Path: <triumphs-owner@autox.team.net>
>Date: Thu, 4 Dec 1997 13:07:53 +0500 (EST)
>From: Andrew Mace <amace@unix2.nysed.gov>
>To: Giancarlo Brignolo <brignolo@sutmyn.com>
>cc: Scions of Stanpart <triumphs@autox.team.net>
>Subject: Re: TR4 oil pressure
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>This was sent to me. Anyone else care to comment to Giancarlo?
>
>On Thu, 4 Dec 1997, Giancarlo Brignolo wrote:
>
>> This is my question:
>>
>> I have a 1963 tr4. The engine has been rebuilt 5,000 miles ago, this was a
>> full rebuild, including oil pump.
>> I use castrol 20W-50. Looking at my oil pressure gauge, it shows 60 at idle
>> and 90 on the freeway. But, if i'm driving in the freeway for an extended
>> period of time, more than 30 minutes, my oil pressure drops from 90 down to
>> about 70, and if I get off the freeway and am idling, my idle pressure is
>> 40. I have checked many times my oil volume, and it was always full.
>> This happens every single time without fail.
>> Is this normal? Should I worry? What is the cause?
>
>Those oil pressure readings sound well within range to me. I'm copying the
>Triumphs e-mail list, in case others have any further insight.
>
>--Andy
>
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