CANT GET MY HEAD AROUND THIS ONE ,ENGINE STOPPED THE OTHER DAY CAM HAD SEIZED TAKING TEETH OFF BELT , REMOVED CAM CLEANED BEARING CAPS , REFITED CAM , NEW BELT, STARTED OK ,BUT GOT NO OIL UPTO CAM ,REMOVED SPRAY BAR BLEW OUT , REFITTED STILL NO OIL , LOADS OF PRESSURE AT PUMP SWITCH , DOESNT MAKE SENSE:bang: