[Healeys] Hi oil pressure

[Roger Grace]

Just started my BJ8 after a long Winter project on OD and other things.
Only engine work done was to change oil pan gasket.
New oil and new filter. VR1 20-50 oil.
When starting from cold oil pressure regulates to around 60 psi. You can see it regulating.
As soon as it starts to warm up (about 10 mins running) pressure gets very hi and follows RPM to about 100 psi at 2000 RPM. Pressure gauge is almost like a tacho !
Today pulled the relief valve (not a trivial task as have oil cooler pipes obstructing) and inspected.
Looks OK apart from a few scuffs on the valve; there is a small washer behind the spring by PO.
Spring free length is 2.3 ins plus 0.1 for washer
Suspecting the filter, changed it too.
Oil gauge is but 12 months old.
Prior to this oil pressure behaved normally; and this is a recently rebuilt engine with about 5k mi
At my wits end and need some ideas please.
rg


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