[Lynn Eades]

Ron, the pre 42 engine had a crankcase breather system where air was drawn in via the oil filler cap (as per your engine filler cap) This was drawn in because the sump had a vent at the r.h. front of the sump, that was affected by the air flow past it (in the draught under the engine in a car or truck) (In other makes, called a draught tube) In your engine there is no vent. However your engine has the hydrovent system which has a thin sandwich plate between the carb base and the valve cover (inlet manifold) This has connected to it by way of various fittings, a PCV valve which is in turn connected to a tapping at the front right side of the inlet manifold (under the generator). In this system a negative flow is drawn in via the oil bath oil filler. This negative pressure is generated from engine vacuum (under closed throttle) and in turn draws throught the PCV valve (I see it, in your engine photo) and in turn through the pipe running forward to the front of the manifold. The early system doesn't work in a carrier with no draught past the sump vent. I hope this all make sense?