Yes, I absolutely concur with John Harper. The gasket blocking the oil
relief passage has happened a number of times to a number of people,
including a close friend of mine. Upon replacing the sump after another job,
new sump gasket covered the relief hole and on startup he suddenly had 100+
PSI.
Simple solution, clear the oil hole.
Rich Chrysler
----- Original Message -----
From: "Frenken, Eric" <efrenken@lctax.de>
To: "John Harper" <AH@jharper.demon.co.uk>
Cc: "Manuel Formosinho Sanchez" <ManuelFS@Emparque.pt>;
<healeys@autox.team.net>
Sent: Monday, January 23, 2006 9:05 AM
Subject: Re: high engine oil pressure/oil sump gasket
> John, I stand corrected. I'm not sure whether you can block the passage
> from the relief valve to the sump with the gasket, but it's a possibility
> I didn't think of when I wrote my first mail.
>
> Maybe a 100 owner is more helpful than me.
>
> Cheers
>
> Eric BT7
> Heinsberg/Germany
> Eric
>
> By all means feel free to pick up on my terminology but I still believe
> that this is a possible reason for Manuel's problem.
>
> I quote from Austin Service Journal A/59 published 15 April 1959
>
> "When an oil reservoir is being replaced after removal, care should be
> taken to see that the replacement gasket does not cover the oil pump
> relief valve passage to the reservoir indicated at 'A' in the
> illustration. Failure to observe this when fitting the gasket will
> result in excessive rise in pressure when the engine is running.
>
> Three gaskets, each having different cut-outs to suit various cylinder
> blocks, have been in use. It is therefore very necessary to scrutinise
> the gasket when in position. If the oil passage is obstructed it is
> permissible to cut away a portion of the gasket to clear the hole and
> leave a free passage for the oil-flow."
>
> Unquote
>
> Unfortunately I don't have a block with the sump off to check the exact
> details but the hole possibly obscured is the one below the oil pressure
> relief valve; where the excess oil drains back into the sump. If a
> gasket has very simple straight edges on the inner side edges and a
> scallop out of its inner edge near the centres it should be OK but if it
> protrudes beyond this is it MIGHT be the cause of the problem. I am not
> saying it is. I am just trying to be helpful.
>
> I would recommend not running the engine until the problem is cured. A
> very high oil pressure might result in the drive key being ripped out of
> the oil pump driven gear.
>
> All the best
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