Re: How to add a PCV Valve to a 1949 Packard

Posted by Packard 1948 On 2015/9/23 11:52:04

Yes...the aft valve cover already has a baffle to keep the oil from venting out of the road draft breather.

The oil fill tube cap has a wire mesh filter that in the original system allowed air to blow in or out. The cap has a groove so that the cap can only be installed in one direction and that was with the opening facing forward so the radiator fan would create a slight positive pressure to prevent blow by from entering the engine compartment. The old engine had so much blow by that the engine compartment was also greasy mess near the oil fill cap.

I found a PCV valve that has a spring loaded piston in it (some are designed for gravity so don't get this type because on the Packard it needs to be installed horizontal) and this spring allows the piston to create a very small vacuum leak at idle and other high engine vacuum conditions (coasting). At wide open throttle the vacuum leak is still there however very slight.

There was zero problems in installing this system...a slight carb adjustment was all that was needed.

Bill