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[Vauxhalloofer]

Hi Peeps, just done headgasket have now got red oil warning light on dash.The oils full and as revs get high, it goes out.

[martin42]

Could be a faulty oil pressure switch

[Vauxhalloofer]

I hope so mate,seems weird that when you rev it it goes out.Where is the switch located.Any ideas thanks

[Andy B]

No idea about this specific engine, but on my Carlton, CIH like Manta etc the oil pump needed needed priming before it'd pump properly.

[Vauxhalloofer]

2.2 dont really know how it works thought it might be self priming

[Entwood]

Having just done the head gasket, I'd be very concerned that something has not been put back together correctly... I don't do coincidences .... Low oil pressure that "appears" to correct under high rpm stinks of an abnormally high flow somewhere in the engine.

Oil pressure is produced by the restrictions to flow that the oilways and channels make .... it really sounds to me like all the oil is going down some easy path of low resistance internally, which means all the other parts of the engine are NOT getting the oil they need for both lubrication and cooling.

I would not be running this engine until the cause of the low oil pressure is proven.

[Vauxhalloofer]

Yep cant see why it would turn itself off at higher rpm unless its a blockage somewhere

[Entwood]

Yep cant see why it would turn itself off at higher rpm unless its a blockage somewhere

It is NOT a "blockage" ... that would give high oil pressure, it is too high a flow somewhere giving LOW oil pressure .. although both high and low are bad for all engines ..

[05omegav6]

Could it be that the oil was refilled and the level checked cold prior to starting, and not subsequently topped up to allow for the 'extra' half litre that the oil filter contains

[Kevin Wood]

I'm going to go for debris (old sealant, etc.) having clogged the pickup strainer in the sump or perhaps got lodged in the pressure relief valve.

[Vauxhalloofer]

Thanks question is could i drive it as i am now not bovered about the car.

[Andy B]

your car ....... your call 

[Entwood]

Thanks question is could i drive it as i am now not bovered about the car.

High risk of seizing or other damage to the engine.

Low oil pressure means a lack of lubrication and cooling to critical parts .....

Out of pure "mechanical sympathy" I would suggest not even starting it, however, as said .. your car, your risk  ... if you go out in it make sure you have breakdown cover !!!

[05omegav6]

Thanks question is could i drive it as i am now not bovered about the car.

Waste of a head gasket

[PhilRich]

Why bother to renew the Head Gasket & all the work that goes with it if you're not bothered about the car
We're mostly Omega enthusiasts here who love these cars and to see one of an ever dwindling number ruined for the sake of a bit of TLC is sickening, at least to me!