It is my opinion that you don't have an oil pressure problem.
The oil pressure specification for the XK engine is "The minimum
pressure at 3,000 RPM when hot should not be less than 40 lbs. per square
inch." It looks like you have that and more.
I have never found a Jaguar factory oil pressure specification for the XK
engine at idle and suspect that one may not exist.
My idea is for you to drive the car, enjoy it, and don’t worry about oil
pressure unless it fails to meet the Jaguar factory specification quoted
BTW, that is for the 3.8L and 4.2L engines, but I believe it is the same
for your 3.4L engine,
Paul M. Novak
1990 Series III V12 Vanden Plas
1990 XJ-S Classic Collection convertible
1987 XJ6 Vanden Plas
1984 XJ6 Vanden Plas
1969 E-Type FHC
1957 MK VIII Saloon
From: email@example.com [mailto:firstname.lastname@example.org]
On Behalf Of spitzstick
Sent: Saturday, December 12, 2015 2:34 PM
Subject: [xk-engine] low oil pressure
I am having difficulty solving this problem and hopefully someone out there
wil have a solution.Have just installed a rebuilt engine in my 3.4 mk2.
Oil pressure is 50 to 60psi when driving but at idle drops to 15 to 20psi.
a mechanicle gauge is used directly from the main oil gallery and I have
fitted a stronger spring in the pressure realease chamber with little or no
change. The original oil pump was used as it came up to specs when measured.
Any ideas please
//please trim quoted text to context only