The Big End Oil Flow Check (B.E.O.F.C) is a little gadget that won't lie. It's incredible easy to install, just take the highest screw/ bolt on the pump of remove it together with the spring
inside. Screw in the B.E.O.F.C. After starting the engine it shows by simply rising (minimal 3 mm) that you have enough oil pressure and the oil passage to the Big End is opened up.
There are several reasons to find when it won't rise, the oil pump can be worn out or for instance your tappets and tappet block are worn out and have too much freeplay. This all creates
oil pressure loss.