ok, so I have had time to investigate and this is what I have discovered.
1. The outlet pressure from the cracnkase/bellhousing is the nearest the left hand side of the engine, and feeds directly into my PRV.
2. I have established that I am getting flow back to the other elbow.
3. As the engine heats up, which takes a long while as I dont have thermostats in the cylinder heads, the oil cooler takes more of the flow and the relief flow to the filler tube slightly reduces. I hope and suspect that as the engine gets really hot there is less flow to this tube and more to the cooler.
4. I dont know quite why my system has been created, as its not in the TM but I think it probably works. MY suspicion is there is a design fault that means that the fuel pump fills up and if you operate on rough ground at speed as I was doing, it will spill out some of this oil
5. I can try to make a gasket for the fuel pump aperture which is better at resisting this oil flow.
6.I have oil pressure, I have oil cooling, and I have an engine that works, so until I can find a Chilwell ( or FORD USA ) mod sheet I think I am going to leave well along and try to avoid oil spillage by physical means.
Thank you all for the help on this, and if the problem continues I will post again, but until I have got the engine really up to temperature I cannot say for sure whether this relief valve flow will cease.
thanks
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