Morris Minor Owners Club

Exactly - and less tendency for oil to be pushed up past the rings. It works !

I advised a friend of mine to do this on his Commer van, the Rootes engine has a similar crankshaft scroll set up to the 'A' series and oil was dribbling past them nicely. As he had done an SU conversion he had a spare vacuum connection so I told him to pipe the crankcase vent to it and it worked - no more leaks

Exactly....

Doing some research it looks like there are two types of Positive Crankcase Ventilation (PCV) systems:

• An 'Open' PCV system that is fitted to the A-Series and many other engines of a similar era

• A 'Closed' PCV system (but not 'sealed') that is fitted to 'Modern' engines

Both systems are essentially the same basic design, with the difference being the source of the filtered air supply into the crankcase - apologies for the V8 example, but it does show clearly the different air supply source between an 'Open' PCV system and a 'Closed' one.
[frame][/frame]
The 'Open' system uses a vented filler cap containing a filter, to draw filtered air through the filler cap into the crankcase, to replace the fumes being drawn out by the PCV system. Air flows IN through the cap, not OUT.

The 'Closed' system has a non-vented filler cap and draws its filtered air IN to the crankcase from the engine side of the air filter.

Roy, I cannot find reference to a 'sealed' PCV system anywhere, can you give a link a documented example of a 'sealed' system, i.e. a partial vacuum source such as a PCV valve, or port on the carburettor and no air inlet into the crankcase please?

On the pick up, keep the quarter lights shut as they pick up the exhaust as well.

I've fitted the non-vented cap, rocker cover pipe feeds into the side pipe on carb and tappet chest exits to air via a rubber pipe extension to the swan neck pipe. The oil smell has now gone.

smithskids wrote:On the pick up, keep the quarter lights shut as they pick up the exhaust as well.

As you say there's usually an exhaust whiff with the windows open but that does tend to disappear as speed increases.

The perfect oil addertive https://alisonlangford.files.wordpress. ... ke-oil.jpg

Well i've checked the rubber pipe from the air filter to the engine and that seems clear enough, so should i check the cylinder "thing" that it feeds into? and if so ....how

If you are talking about the oil separator/breather/flame trap fitted to the front cam follower cover - with the pipe fitted blow through the pipe and if clear you should be able to blow through easily - if not clean and to do so remove the cover and rinse through with de-greaser or similar.
The canister should be clear if not have a good poke around inside and you may find an awful lot of foul stuff falls out.
For example:- this is the remains of the gauze from a blocked oil separator/breather/flame trap.[frame][/frame]
It is important that you remove all possibility of any remaining gauze falling back into the engine.