I think the oil is pressed through the filter, too high a pressure in
the filter bowl results in a bypass valve opening. This usually only
happens when the filter is clogged. Thats the usual setp and I don't
know if there is such thing as a bypass in the TR6.
> ----------
> From: Allen Nugent[SMTP:A.Nugent@unsw.edu.au]
> Reply To: Allen Nugent
> Sent: Tuesday, May 12, 1998 3:25 AM
> To: Gernot Vonhoegen
> Cc: triumphs@autox.team.net
> Subject: Re: oil pressure TR6
>
>
> Gernot,
>
> At 14:02 11/05/98 +0100, you wrote:
> >
> >G'day...
> >After my lst oil change, I noticed, that the oil pressure gauge
> needle
> >approaches 7kg when running cold. Idle is about 5kg. Now is 7 too
> high
> >and should the (a) pressure relief valve activate? Nothing to say
> >against a good oil pressure, but I fear that may be the oil filter is
> >getting bypassed or some other horror. May be the wrong filter, I
> bought
> >it at the local Halfrauds, as I didn't want to mail order one. He
> said,
> >the filter is identical with the PI one(mine is a '74 carb), which
> >sounds reasonable to me, but must not have been reasonable for
> Triumph.
>
> I'd like to know who was the bozo who first decided to use units of
> mass (or
> mass over area) to indicate pressure! Anyway, I assume you meant "7 kg
> per
> sq. cm", so I converted to PSI (which is the more familiar unit for
> automotive oil pressure), and got 100.
>
> This certainly is high. I've got an uprated relief spring in my oil
> pump,
> and it maxes at 80 PSI. Maybe your relief valve is jamming on
> something?
>
> Is the filter downstream or upstream of the oil pump, anybody? I think
> an
> overly restrictive filter would cause reduced oil pressure, no matter
> where
> it was. If the filter is downstream, and normally has a high
> resistance,
> then a funny filter with low resistance would yield higher oil
> pressure.
>
> N.B. I'm relying an analogy with artificial hearts, so I may be
> overlooking
> something more specific to oil pumps.
>
> Allen Nugent
> Graduate School of Biomedical Engineering
> University of New South Wales
> Sydney 2052 Australia
>
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