Help - oil pressure / flow on engine first start.

[Robert Leigh]

I would expect to get oil from the pressure tapping when cranking the engine, particularly at 12v speed. I once failed to notice that I was fitting the wrong generation of rear bush for the camshaft; there are two different outside diameters, and the smaller one in the larger crankcase bore allows any pressure from the pump to be dissipated outside the bush straight to the sump without circulating through the pressure system.