thanks for the replies, oil pressure comes up in @ 3 seconds with top end rattle so its not the sender/gauge. Crank bolt was seriously tight too. where is the oil non return in the cylinder head? my car is a 2.5 non turbo. I think the engine is 1990, but the cam belt tensioner is still a manual adjustment not spring loaded so I'm not 100% sure. (it was replaced by porsche as original went bang at 60K - did someone do the cam belt wrong????). Where is the engine serial number I can't find one on mine?
so far I have stripped off the oil cooler, pressure sender and oil pressure relief valve, oil sump and pick up pipe (no sign of any cracks), about to take off the oil pump (want to clean everything before I take it off, lots of muck all around it). So far not found anything I can point at directly but having read previous threads it could be any of the above with only a slight leak for the air to get in and let the oil run down. So I have decided to pull off anything oil pressure related and redo it anyway. Easy to do it now whilst I have got the steering rack, support beam etc off anyway. Oil filter is a brand new Porsche original I put on a few weeks back just in case it was that.
Also found that the engine mount under the exhaust manifold was loose - the mount was previously replaced by a "Porsche Specialist" who has cross threaded the bolts! and then couldn't tighten them up, what a tw@t, also found the the balance shafts are nowhere near aligned correctly which is possibly why the internal leak has started. Looks like previous muppet who change the cam belt etc made no attempt to align them. Lesson learned, I should have checked them when I bought the car.
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