----- Original Message -----
From: "John & Patricia Donnelly" <pdonnel1@san.rr.com>
To: "Triumphs List (E-mail)" <triumphs@autox.team.net>
Sent: Friday, May 07, 2004 8:00 PM
Subject: Sudden Low Oil Pressure - TRactor Engine
> HI Everyone,
>
> After a 2 hour drive at freeway speed the overall oil pressure has dropped
> significantly. Before, the oil pressure ran at 70 PSI at 3K+ rpm, now it
> runs at 20 PSI. The highest it'll go is 40 PSI at 4K rpm. Not good.
>
> Here's my guess, but I'd like some opinions before I start replacing
parts.
> I think that the screen on the oil pump has clogged, so the normal oil
> pressure can't develop.
>
> Any other ideas for the sudden drop off of pressure?
>
> Thanks!
> John
> '67 TR4A IRS
> Pretty much original, but has spin on oil filter
John,
There was a thread on this question just 2 weeks ago. Here's what Randall
said at that time:
"When it happened to me (years ago on a non-LBC), changing oil did not help.
There was clearly a thin, sticky coating on the pressure relief valve, which
could only be seen if you scraped it off, but enough to keep the valve from
closing under it's own spring pressure. Of course I can't prove that was
due to using Castrol ... but I switched brands and never had the problem
again in 32 years."
Just thought I'd save you some typing Randall :-)
Bob
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